// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * (C) Copyright David Gibson <dwg@au1.ibm.com>, IBM Corporation.  2007.
 */

#include "dtc.h"
#include "srcpos.h"

#ifdef TRACE_CHECKS
#define TRACE(c, ...) \
        do { \
                fprintf(stderr, "=== %s: ", (c)->name); \
                fprintf(stderr, __VA_ARGS__); \
                fprintf(stderr, "\n"); \
        } while (0)
#else
#define TRACE(c, fmt, ...)      do { } while (0)
#endif

enum checkstatus {
        UNCHECKED = 0,
        PREREQ,
        PASSED,
        FAILED,
};

struct check;

typedef void (*check_fn)(struct check *c, struct dt_info *dti, struct node *node);

struct check {
        const char *name;
        check_fn fn;
        void *data;
        bool warn, error;
        enum checkstatus status;
        bool inprogress;
        int num_prereqs;
        struct check **prereq;
};

#define CHECK_ENTRY(nm_, fn_, d_, w_, e_, ...)         \
        static struct check *nm_##_prereqs[] = { __VA_ARGS__ }; \
        static struct check nm_ = { \
                .name = #nm_, \
                .fn = (fn_), \
                .data = (d_), \
                .warn = (w_), \
                .error = (e_), \
                .status = UNCHECKED, \
                .num_prereqs = ARRAY_SIZE(nm_##_prereqs), \
                .prereq = nm_##_prereqs, \
        };
#define WARNING(nm_, fn_, d_, ...) \
        CHECK_ENTRY(nm_, fn_, d_, true, false, __VA_ARGS__)
#define ERROR(nm_, fn_, d_, ...) \
        CHECK_ENTRY(nm_, fn_, d_, false, true, __VA_ARGS__)
#define CHECK(nm_, fn_, d_, ...) \
        CHECK_ENTRY(nm_, fn_, d_, false, false, __VA_ARGS__)

static inline void  PRINTF(5, 6) check_msg(struct check *c, struct dt_info *dti,
                                           struct node *node,
                                           struct property *prop,
                                           const char *fmt, ...)
{
        va_list ap;
        char *str = NULL;
        struct srcpos *pos = NULL;
        char *file_str;

        if (!(c->warn && (quiet < 1)) && !(c->error && (quiet < 2)))
                return;

        if (prop && prop->srcpos)
                pos = prop->srcpos;
        else if (node && node->srcpos)
                pos = node->srcpos;

        if (pos) {
                file_str = srcpos_string(pos);
                xasprintf(&str, "%s", file_str);
                free(file_str);
        } else if (streq(dti->outname, "-")) {
                xasprintf(&str, "<stdout>");
        } else {
                xasprintf(&str, "%s", dti->outname);
        }

        xasprintf_append(&str, ": %s (%s): ",
                        (c->error) ? "ERROR" : "Warning", c->name);

        if (node) {
                if (prop)
                        xasprintf_append(&str, "%s:%s: ", node->fullpath, prop->name);
                else
                        xasprintf_append(&str, "%s: ", node->fullpath);
        }

        va_start(ap, fmt);
        xavsprintf_append(&str, fmt, ap);
        va_end(ap);

        xasprintf_append(&str, "\n");

        if (!prop && pos) {
                pos = node->srcpos;
                while (pos->next) {
                        pos = pos->next;

                        file_str = srcpos_string(pos);
                        xasprintf_append(&str, "  also defined at %s\n", file_str);
                        free(file_str);
                }
        }

        fputs(str, stderr);
}

#define FAIL(c, dti, node, ...)                                         \
        do {                                                            \
                TRACE((c), "\t\tFAILED at %s:%d", __FILE__, __LINE__);  \
                (c)->status = FAILED;                                   \
                check_msg((c), dti, node, NULL, __VA_ARGS__);           \
        } while (0)

#define FAIL_PROP(c, dti, node, prop, ...)                              \
        do {                                                            \
                TRACE((c), "\t\tFAILED at %s:%d", __FILE__, __LINE__);  \
                (c)->status = FAILED;                                   \
                check_msg((c), dti, node, prop, __VA_ARGS__);           \
        } while (0)


static void check_nodes_props(struct check *c, struct dt_info *dti, struct node *node)
{
        struct node *child;

        TRACE(c, "%s", node->fullpath);
        if (c->fn)
                c->fn(c, dti, node);

        for_each_child(node, child)
                check_nodes_props(c, dti, child);
}

static bool run_check(struct check *c, struct dt_info *dti)
{
        struct node *dt = dti->dt;
        bool error = false;
        int i;

        assert(!c->inprogress);

        if (c->status != UNCHECKED)
                goto out;

        c->inprogress = true;

        for (i = 0; i < c->num_prereqs; i++) {
                struct check *prq = c->prereq[i];
                error = error || run_check(prq, dti);
                if (prq->status != PASSED) {
                        c->status = PREREQ;
                        check_msg(c, dti, NULL, NULL, "Failed prerequisite '%s'",
                                  c->prereq[i]->name);
                }
        }

        if (c->status != UNCHECKED)
                goto out;

        check_nodes_props(c, dti, dt);

        if (c->status == UNCHECKED)
                c->status = PASSED;

        TRACE(c, "\tCompleted, status %d", c->status);

out:
        c->inprogress = false;
        if ((c->status != PASSED) && (c->error))
                error = true;
        return error;
}

/*
 * Utility check functions
 */

/* A check which always fails, for testing purposes only */
static inline void check_always_fail(struct check *c, struct dt_info *dti,
                                     struct node *node)
{
        FAIL(c, dti, node, "always_fail check");
}
CHECK(always_fail, check_always_fail, NULL);

static void check_is_string(struct check *c, struct dt_info *dti,
                            struct node *node)
{
        struct property *prop;
        char *propname = c->data;

        prop = get_property(node, propname);
        if (!prop)
                return; /* Not present, assumed ok */

        if (!data_is_one_string(prop->val))
                FAIL_PROP(c, dti, node, prop, "property is not a string");
}
#define WARNING_IF_NOT_STRING(nm, propname) \
        WARNING(nm, check_is_string, (propname))
#define ERROR_IF_NOT_STRING(nm, propname) \
        ERROR(nm, check_is_string, (propname))

static void check_is_string_list(struct check *c, struct dt_info *dti,
                                 struct node *node)
{
        int rem, l;
        struct property *prop;
        char *propname = c->data;
        char *str;

        prop = get_property(node, propname);
        if (!prop)
                return; /* Not present, assumed ok */

        str = prop->val.val;
        rem = prop->val.len;
        while (rem > 0) {
                l = strnlen(str, rem);
                if (l == rem) {
                        FAIL_PROP(c, dti, node, prop, "property is not a string list");
                        break;
                }
                rem -= l + 1;
                str += l + 1;
        }
}
#define WARNING_IF_NOT_STRING_LIST(nm, propname) \
        WARNING(nm, check_is_string_list, (propname))
#define ERROR_IF_NOT_STRING_LIST(nm, propname) \
        ERROR(nm, check_is_string_list, (propname))

static void check_is_cell(struct check *c, struct dt_info *dti,
                          struct node *node)
{
        struct property *prop;
        char *propname = c->data;

        prop = get_property(node, propname);
        if (!prop)
                return; /* Not present, assumed ok */

        if (prop->val.len != sizeof(cell_t))
                FAIL_PROP(c, dti, node, prop, "property is not a single cell");
}
#define WARNING_IF_NOT_CELL(nm, propname) \
        WARNING(nm, check_is_cell, (propname))
#define ERROR_IF_NOT_CELL(nm, propname) \
        ERROR(nm, check_is_cell, (propname))

/*
 * Structural check functions
 */

static void check_duplicate_node_names(struct check *c, struct dt_info *dti,
                                       struct node *node)
{
        struct node *child, *child2;

        for_each_child(node, child)
                for (child2 = child->next_sibling;
                     child2;
                     child2 = child2->next_sibling)
                        if (streq(child->name, child2->name))
                                FAIL(c, dti, child2, "Duplicate node name");
}
ERROR(duplicate_node_names, check_duplicate_node_names, NULL);

static void check_duplicate_property_names(struct check *c, struct dt_info *dti,
                                           struct node *node)
{
        struct property *prop, *prop2;

        for_each_property(node, prop) {
                for (prop2 = prop->next; prop2; prop2 = prop2->next) {
                        if (prop2->deleted)
                                continue;
                        if (streq(prop->name, prop2->name))
                                FAIL_PROP(c, dti, node, prop, "Duplicate property name");
                }
        }
}
ERROR(duplicate_property_names, check_duplicate_property_names, NULL);

#define LOWERCASE       "abcdefghijklmnopqrstuvwxyz"
#define UPPERCASE       "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
#define DIGITS          "0123456789"
#define PROPNODECHARS   LOWERCASE UPPERCASE DIGITS ",._+*#?-"
#define PROPNODECHARSSTRICT     LOWERCASE UPPERCASE DIGITS ",-"

static void check_node_name_chars(struct check *c, struct dt_info *dti,
                                  struct node *node)
{
        int n = strspn(node->name, c->data);

        if (n < strlen(node->name))
                FAIL(c, dti, node, "Bad character '%c' in node name",
                     node->name[n]);
}
ERROR(node_name_chars, check_node_name_chars, PROPNODECHARS "@");

static void check_node_name_chars_strict(struct check *c, struct dt_info *dti,
                                         struct node *node)
{
        int n = strspn(node->name, c->data);

        if (n < node->basenamelen)
                FAIL(c, dti, node, "Character '%c' not recommended in node name",
                     node->name[n]);
}
CHECK(node_name_chars_strict, check_node_name_chars_strict, PROPNODECHARSSTRICT);

static void check_node_name_format(struct check *c, struct dt_info *dti,
                                   struct node *node)
{
        if (strchr(get_unitname(node), '@'))
                FAIL(c, dti, node, "multiple '@' characters in node name");
}
ERROR(node_name_format, check_node_name_format, NULL, &node_name_chars);

static void check_unit_address_vs_reg(struct check *c, struct dt_info *dti,
                                      struct node *node)
{
        const char *unitname = get_unitname(node);
        struct property *prop = get_property(node, "reg");

        if (get_subnode(node, "__overlay__")) {
                /* HACK: Overlay fragments are a special case */
                return;
        }

        if (!prop) {
                prop = get_property(node, "ranges");
                if (prop && !prop->val.len)
                        prop = NULL;
        }

        if (prop) {
                if (!unitname[0])
                        FAIL(c, dti, node, "node has a reg or ranges property, but no unit name");
        } else {
                if (unitname[0])
                        FAIL(c, dti, node, "node has a unit name, but no reg property");
        }
}
WARNING(unit_address_vs_reg, check_unit_address_vs_reg, NULL);

static void check_property_name_chars(struct check *c, struct dt_info *dti,
                                      struct node *node)
{
        struct property *prop;

        for_each_property(node, prop) {
                int n = strspn(prop->name, c->data);

                if (n < strlen(prop->name))
                        FAIL_PROP(c, dti, node, prop, "Bad character '%c' in property name",
                                  prop->name[n]);
        }
}
ERROR(property_name_chars, check_property_name_chars, PROPNODECHARS);

static void check_property_name_chars_strict(struct check *c,
                                             struct dt_info *dti,
                                             struct node *node)
{
        struct property *prop;

        for_each_property(node, prop) {
                const char *name = prop->name;
                int n = strspn(name, c->data);

                if (n == strlen(prop->name))
                        continue;

                /* Certain names are whitelisted */
                if (streq(name, "device_type"))
                        continue;

                /*
                 * # is only allowed at the beginning of property names not counting
                 * the vendor prefix.
                 */
                if (name[n] == '#' && ((n == 0) || (name[n-1] == ','))) {
                        name += n + 1;
                        n = strspn(name, c->data);
                }
                if (n < strlen(name))
                        FAIL_PROP(c, dti, node, prop, "Character '%c' not recommended in property name",
                                  name[n]);
        }
}
CHECK(property_name_chars_strict, check_property_name_chars_strict, PROPNODECHARSSTRICT);

#define DESCLABEL_FMT   "%s%s%s%s%s"
#define DESCLABEL_ARGS(node,prop,mark)          \
        ((mark) ? "value of " : ""),            \
        ((prop) ? "'" : ""), \
        ((prop) ? (prop)->name : ""), \
        ((prop) ? "' in " : ""), (node)->fullpath

static void check_duplicate_label(struct check *c, struct dt_info *dti,
                                  const char *label, struct node *node,
                                  struct property *prop, struct marker *mark)
{
        struct node *dt = dti->dt;
        struct node *othernode = NULL;
        struct property *otherprop = NULL;
        struct marker *othermark = NULL;

        othernode = get_node_by_label(dt, label);

        if (!othernode)
                otherprop = get_property_by_label(dt, label, &othernode);
        if (!othernode)
                othermark = get_marker_label(dt, label, &othernode,
                                               &otherprop);

        if (!othernode)
                return;

        if ((othernode != node) || (otherprop != prop) || (othermark != mark))
                FAIL(c, dti, node, "Duplicate label '%s' on " DESCLABEL_FMT
                     " and " DESCLABEL_FMT,
                     label, DESCLABEL_ARGS(node, prop, mark),
                     DESCLABEL_ARGS(othernode, otherprop, othermark));
}

static void check_duplicate_label_node(struct check *c, struct dt_info *dti,
                                       struct node *node)
{
        struct label *l;
        struct property *prop;

        for_each_label(node->labels, l)
                check_duplicate_label(c, dti, l->label, node, NULL, NULL);

        for_each_property(node, prop) {
                struct marker *m = prop->val.markers;

                for_each_label(prop->labels, l)
                        check_duplicate_label(c, dti, l->label, node, prop, NULL);

                for_each_marker_of_type(m, LABEL)
                        check_duplicate_label(c, dti, m->ref, node, prop, m);
        }
}
ERROR(duplicate_label, check_duplicate_label_node, NULL);

static cell_t check_phandle_prop(struct check *c, struct dt_info *dti,
                                 struct node *node, const char *propname)
{
        struct node *root = dti->dt;
        struct property *prop;
        struct marker *m;
        cell_t phandle;

        prop = get_property(node, propname);
        if (!prop)
                return 0;

        if (prop->val.len != sizeof(cell_t)) {
                FAIL_PROP(c, dti, node, prop, "bad length (%d) %s property",
                          prop->val.len, prop->name);
                return 0;
        }

        m = prop->val.markers;
        for_each_marker_of_type(m, REF_PHANDLE) {
                assert(m->offset == 0);
                if (node != get_node_by_ref(root, m->ref))
                        /* "Set this node's phandle equal to some
                         * other node's phandle".  That's nonsensical
                         * by construction. */ {
                        FAIL(c, dti, node, "%s is a reference to another node",
                             prop->name);
                }
                /* But setting this node's phandle equal to its own
                 * phandle is allowed - that means allocate a unique
                 * phandle for this node, even if it's not otherwise
                 * referenced.  The value will be filled in later, so
                 * we treat it as having no phandle data for now. */
                return 0;
        }

        phandle = propval_cell(prop);

        if ((phandle == 0) || (phandle == -1)) {
                FAIL_PROP(c, dti, node, prop, "bad value (0x%x) in %s property",
                     phandle, prop->name);
                return 0;
        }

        return phandle;
}

static void check_explicit_phandles(struct check *c, struct dt_info *dti,
                                    struct node *node)
{
        struct node *root = dti->dt;
        struct node *other;
        cell_t phandle, linux_phandle;

        /* Nothing should have assigned phandles yet */
        assert(!node->phandle);

        phandle = check_phandle_prop(c, dti, node, "phandle");

        linux_phandle = check_phandle_prop(c, dti, node, "linux,phandle");

        if (!phandle && !linux_phandle)
                /* No valid phandles; nothing further to check */
                return;

        if (linux_phandle && phandle && (phandle != linux_phandle))
                FAIL(c, dti, node, "mismatching 'phandle' and 'linux,phandle'"
                     " properties");

        if (linux_phandle && !phandle)
                phandle = linux_phandle;

        other = get_node_by_phandle(root, phandle);
        if (other && (other != node)) {
                FAIL(c, dti, node, "duplicated phandle 0x%x (seen before at %s)",
                     phandle, other->fullpath);
                return;
        }

        node->phandle = phandle;
}
ERROR(explicit_phandles, check_explicit_phandles, NULL);

static void check_name_properties(struct check *c, struct dt_info *dti,
                                  struct node *node)
{
        struct property **pp, *prop = NULL;

        for (pp = &node->proplist; *pp; pp = &((*pp)->next))
                if (streq((*pp)->name, "name")) {
                        prop = *pp;
                        break;
                }

        if (!prop)
                return; /* No name property, that's fine */

        if ((prop->val.len != node->basenamelen+1)
            || (memcmp(prop->val.val, node->name, node->basenamelen) != 0)) {
                FAIL(c, dti, node, "\"name\" property is incorrect (\"%s\" instead"
                     " of base node name)", prop->val.val);
        } else {
                /* The name property is correct, and therefore redundant.
                 * Delete it */
                *pp = prop->next;
                free(prop->name);
                data_free(prop->val);
                free(prop);
        }
}
ERROR_IF_NOT_STRING(name_is_string, "name");
ERROR(name_properties, check_name_properties, NULL, &name_is_string);

/*
 * Reference fixup functions
 */

static void fixup_phandle_references(struct check *c, struct dt_info *dti,
                                     struct node *node)
{
        struct node *dt = dti->dt;
        struct property *prop;

        for_each_property(node, prop) {
                struct marker *m = prop->val.markers;
                struct node *refnode;
                cell_t phandle;

                for_each_marker_of_type(m, REF_PHANDLE) {
                        assert(m->offset + sizeof(cell_t) <= prop->val.len);

                        refnode = get_node_by_ref(dt, m->ref);
                        if (! refnode) {
                                if (!(dti->dtsflags & DTSF_PLUGIN))
                                        FAIL(c, dti, node, "Reference to non-existent node or "
                                                        "label \"%s\"\n", m->ref);
                                else /* mark the entry as unresolved */
                                        *((fdt32_t *)(prop->val.val + m->offset)) =
                                                cpu_to_fdt32(0xffffffff);
                                continue;
                        }

                        phandle = get_node_phandle(dt, refnode);
                        *((fdt32_t *)(prop->val.val + m->offset)) = cpu_to_fdt32(phandle);

                        reference_node(refnode);
                }
        }
}
ERROR(phandle_references, fixup_phandle_references, NULL,
      &duplicate_node_names, &explicit_phandles);

static void fixup_path_references(struct check *c, struct dt_info *dti,
                                  struct node *node)
{
        struct node *dt = dti->dt;
        struct property *prop;

        for_each_property(node, prop) {
                struct marker *m = prop->val.markers;
                struct node *refnode;
                char *path;

                for_each_marker_of_type(m, REF_PATH) {
                        assert(m->offset <= prop->val.len);

                        refnode = get_node_by_ref(dt, m->ref);
                        if (!refnode) {
                                FAIL(c, dti, node, "Reference to non-existent node or label \"%s\"\n",
                                     m->ref);
                                continue;
                        }

                        path = refnode->fullpath;
                        prop->val = data_insert_at_marker(prop->val, m, path,
                                                          strlen(path) + 1);

                        reference_node(refnode);
                }
        }
}
ERROR(path_references, fixup_path_references, NULL, &duplicate_node_names);

static void fixup_omit_unused_nodes(struct check *c, struct dt_info *dti,
                                    struct node *node)
{
        if (generate_symbols && node->labels)
                return;
        if (node->omit_if_unused && !node->is_referenced)
                delete_node(node);
}
ERROR(omit_unused_nodes, fixup_omit_unused_nodes, NULL, &phandle_references, &path_references);

/*
 * Semantic checks
 */
WARNING_IF_NOT_CELL(address_cells_is_cell, "#address-cells");
WARNING_IF_NOT_CELL(size_cells_is_cell, "#size-cells");
WARNING_IF_NOT_CELL(interrupt_cells_is_cell, "#interrupt-cells");

WARNING_IF_NOT_STRING(device_type_is_string, "device_type");
WARNING_IF_NOT_STRING(model_is_string, "model");
WARNING_IF_NOT_STRING(status_is_string, "status");
WARNING_IF_NOT_STRING(label_is_string, "label");

WARNING_IF_NOT_STRING_LIST(compatible_is_string_list, "compatible");

static void check_names_is_string_list(struct check *c, struct dt_info *dti,
                                       struct node *node)
{
        struct property *prop;

        for_each_property(node, prop) {
                const char *s = strrchr(prop->name, '-');
                if (!s || !streq(s, "-names"))
                        continue;

                c->data = prop->name;
                check_is_string_list(c, dti, node);
        }
}
WARNING(names_is_string_list, check_names_is_string_list, NULL);

static void check_alias_paths(struct check *c, struct dt_info *dti,
                                    struct node *node)
{
        struct property *prop;

        if (!streq(node->name, "aliases"))
                return;

        for_each_property(node, prop) {
                if (streq(prop->name, "phandle")
                    || streq(prop->name, "linux,phandle")) {
                        continue;
                }

                if (!prop->val.val || !get_node_by_path(dti->dt, prop->val.val)) {
                        FAIL_PROP(c, dti, node, prop, "aliases property is not a valid node (%s)",
                                  prop->val.val);
                        continue;
                }
                if (strspn(prop->name, LOWERCASE DIGITS "-") != strlen(prop->name))
                        FAIL(c, dti, node, "aliases property name must include only lowercase and '-'");
        }
}
WARNING(alias_paths, check_alias_paths, NULL);

static void fixup_addr_size_cells(struct check *c, struct dt_info *dti,
                                  struct node *node)
{
        struct property *prop;

        node->addr_cells = -1;
        node->size_cells = -1;

        prop = get_property(node, "#address-cells");
        if (prop)
                node->addr_cells = propval_cell(prop);

        prop = get_property(node, "#size-cells");
        if (prop)
                node->size_cells = propval_cell(prop);
}
WARNING(addr_size_cells, fixup_addr_size_cells, NULL,
        &address_cells_is_cell, &size_cells_is_cell);

#define node_addr_cells(n) \
        (((n)->addr_cells == -1) ? 2 : (n)->addr_cells)
#define node_size_cells(n) \
        (((n)->size_cells == -1) ? 1 : (n)->size_cells)

static void check_reg_format(struct check *c, struct dt_info *dti,
                             struct node *node)
{
        struct property *prop;
        int addr_cells, size_cells, entrylen;

        prop = get_property(node, "reg");
        if (!prop)
                return; /* No "reg", that's fine */

        if (!node->parent) {
                FAIL(c, dti, node, "Root node has a \"reg\" property");
                return;
        }

        if (prop->val.len == 0)
                FAIL_PROP(c, dti, node, prop, "property is empty");

        addr_cells = node_addr_cells(node->parent);
        size_cells = node_size_cells(node->parent);
        entrylen = (addr_cells + size_cells) * sizeof(cell_t);

        if (!entrylen || (prop->val.len % entrylen) != 0)
                FAIL_PROP(c, dti, node, prop, "property has invalid length (%d bytes) "
                          "(#address-cells == %d, #size-cells == %d)",
                          prop->val.len, addr_cells, size_cells);
}
WARNING(reg_format, check_reg_format, NULL, &addr_size_cells);

static void check_ranges_format(struct check *c, struct dt_info *dti,
                                struct node *node)
{
        struct property *prop;
        int c_addr_cells, p_addr_cells, c_size_cells, p_size_cells, entrylen;

        prop = get_property(node, "ranges");
        if (!prop)
                return;

        if (!node->parent) {
                FAIL_PROP(c, dti, node, prop, "Root node has a \"ranges\" property");
                return;
        }

        p_addr_cells = node_addr_cells(node->parent);
        p_size_cells = node_size_cells(node->parent);
        c_addr_cells = node_addr_cells(node);
        c_size_cells = node_size_cells(node);
        entrylen = (p_addr_cells + c_addr_cells + c_size_cells) * sizeof(cell_t);

        if (prop->val.len == 0) {
                if (p_addr_cells != c_addr_cells)
                        FAIL_PROP(c, dti, node, prop, "empty \"ranges\" property but its "
                                  "#address-cells (%d) differs from %s (%d)",
                                  c_addr_cells, node->parent->fullpath,
                                  p_addr_cells);
                if (p_size_cells != c_size_cells)
                        FAIL_PROP(c, dti, node, prop, "empty \"ranges\" property but its "
                                  "#size-cells (%d) differs from %s (%d)",
                                  c_size_cells, node->parent->fullpath,
                                  p_size_cells);
        } else if ((prop->val.len % entrylen) != 0) {
                FAIL_PROP(c, dti, node, prop, "\"ranges\" property has invalid length (%d bytes) "
                          "(parent #address-cells == %d, child #address-cells == %d, "
                          "#size-cells == %d)", prop->val.len,
                          p_addr_cells, c_addr_cells, c_size_cells);
        }
}
WARNING(ranges_format, check_ranges_format, NULL, &addr_size_cells);

static const struct bus_type pci_bus = {
        .name = "PCI",
};

static void check_pci_bridge(struct check *c, struct dt_info *dti, struct node *node)
{
        struct property *prop;
        cell_t *cells;

        prop = get_property(node, "device_type");
        if (!prop || !streq(prop->val.val, "pci"))
                return;

        node->bus = &pci_bus;

        if (!strprefixeq(node->name, node->basenamelen, "pci") &&
            !strprefixeq(node->name, node->basenamelen, "pcie"))
                FAIL(c, dti, node, "node name is not \"pci\" or \"pcie\"");

        prop = get_property(node, "ranges");
        if (!prop)
                FAIL(c, dti, node, "missing ranges for PCI bridge (or not a bridge)");

        if (node_addr_cells(node) != 3)
                FAIL(c, dti, node, "incorrect #address-cells for PCI bridge");
        if (node_size_cells(node) != 2)
                FAIL(c, dti, node, "incorrect #size-cells for PCI bridge");

        prop = get_property(node, "bus-range");
        if (!prop)
                return;

        if (prop->val.len != (sizeof(cell_t) * 2)) {
                FAIL_PROP(c, dti, node, prop, "value must be 2 cells");
                return;
        }
        cells = (cell_t *)prop->val.val;
        if (fdt32_to_cpu(cells[0]) > fdt32_to_cpu(cells[1]))
                FAIL_PROP(c, dti, node, prop, "1st cell must be less than or equal to 2nd cell");
        if (fdt32_to_cpu(cells[1]) > 0xff)
                FAIL_PROP(c, dti, node, prop, "maximum bus number must be less than 256");
}
WARNING(pci_bridge, check_pci_bridge, NULL,
        &device_type_is_string, &addr_size_cells);

static void check_pci_device_bus_num(struct check *c, struct dt_info *dti, struct node *node)
{
        struct property *prop;
        unsigned int bus_num, min_bus, max_bus;
        cell_t *cells;

        if (!node->parent || (node->parent->bus != &pci_bus))
                return;

        prop = get_property(node, "reg");
        if (!prop)
                return;

        cells = (cell_t *)prop->val.val;
        bus_num = (fdt32_to_cpu(cells[0]) & 0x00ff0000) >> 16;

        prop = get_property(node->parent, "bus-range");
        if (!prop) {
                min_bus = max_bus = 0;
        } else {
                cells = (cell_t *)prop->val.val;
                min_bus = fdt32_to_cpu(cells[0]);
                max_bus = fdt32_to_cpu(cells[0]);
        }
        if ((bus_num < min_bus) || (bus_num > max_bus))
                FAIL_PROP(c, dti, node, prop, "PCI bus number %d out of range, expected (%d - %d)",
                          bus_num, min_bus, max_bus);
}
WARNING(pci_device_bus_num, check_pci_device_bus_num, NULL, &reg_format, &pci_bridge);

static void check_pci_device_reg(struct check *c, struct dt_info *dti, struct node *node)
{
        struct property *prop;
        const char *unitname = get_unitname(node);
        char unit_addr[5];
        unsigned int dev, func, reg;
        cell_t *cells;

        if (!node->parent || (node->parent->bus != &pci_bus))
                return;

        prop = get_property(node, "reg");
        if (!prop) {
                FAIL(c, dti, node, "missing PCI reg property");
                return;
        }

        cells = (cell_t *)prop->val.val;
        if (cells[1] || cells[2])
                FAIL_PROP(c, dti, node, prop, "PCI reg config space address cells 2 and 3 must be 0");

        reg = fdt32_to_cpu(cells[0]);
        dev = (reg & 0xf800) >> 11;
        func = (reg & 0x700) >> 8;

        if (reg & 0xff000000)
                FAIL_PROP(c, dti, node, prop, "PCI reg address is not configuration space");
        if (reg & 0x000000ff)
                FAIL_PROP(c, dti, node, prop, "PCI reg config space address register number must be 0");

        if (func == 0) {
                snprintf(unit_addr, sizeof(unit_addr), "%x", dev);
                if (streq(unitname, unit_addr))
                        return;
        }

        snprintf(unit_addr, sizeof(unit_addr), "%x,%x", dev, func);
        if (streq(unitname, unit_addr))
                return;

        FAIL(c, dti, node, "PCI unit address format error, expected \"%s\"",
             unit_addr);
}
WARNING(pci_device_reg, check_pci_device_reg, NULL, &reg_format, &pci_bridge);

static const struct bus_type simple_bus = {
        .name = "simple-bus",
};

static bool node_is_compatible(struct node *node, const char *compat)
{
        struct property *prop;
        const char *str, *end;

        prop = get_property(node, "compatible");
        if (!prop)
                return false;

        for (str = prop->val.val, end = str + prop->val.len; str < end;
             str += strnlen(str, end - str) + 1) {
                if (streq(str, compat))
                        return true;
        }
        return false;
}

static void check_simple_bus_bridge(struct check *c, struct dt_info *dti, struct node *node)
{
        if (node_is_compatible(node, "simple-bus"))
                node->bus = &simple_bus;
}
WARNING(simple_bus_bridge, check_simple_bus_bridge, NULL,
        &addr_size_cells, &compatible_is_string_list);

static void check_simple_bus_reg(struct check *c, struct dt_info *dti, struct node *node)
{
        struct property *prop;
        const char *unitname = get_unitname(node);
        char unit_addr[17];
        unsigned int size;
        uint64_t reg = 0;
        cell_t *cells = NULL;

        if (!node->parent || (node->parent->bus != &simple_bus))
                return;

        prop = get_property(node, "reg");
        if (prop)
                cells = (cell_t *)prop->val.val;
        else {
                prop = get_property(node, "ranges");
                if (prop && prop->val.len)
                        /* skip of child address */
                        cells = ((cell_t *)prop->val.val) + node_addr_cells(node);
        }

        if (!cells) {
                if (node->parent->parent && !(node->bus == &simple_bus))
                        FAIL(c, dti, node, "missing or empty reg/ranges property");
                return;
        }

        size = node_addr_cells(node->parent);
        while (size--)
                reg = (reg << 32) | fdt32_to_cpu(*(cells++));

        snprintf(unit_addr, sizeof(unit_addr), "%"PRIx64, reg);
        if (!streq(unitname, unit_addr))
                FAIL(c, dti, node, "simple-bus unit address format error, expected \"%s\"",
                     unit_addr);
}
WARNING(simple_bus_reg, check_simple_bus_reg, NULL, &reg_format, &simple_bus_bridge);

static const struct bus_type i2c_bus = {
        .name = "i2c-bus",
};

static void check_i2c_bus_bridge(struct check *c, struct dt_info *dti, struct node *node)
{
        if (strprefixeq(node->name, node->basenamelen, "i2c-bus") ||
            strprefixeq(node->name, node->basenamelen, "i2c-arb")) {
                node->bus = &i2c_bus;

        } else if (strprefixeq(node->name, node->basenamelen, "i2c")) {
                struct node *child;
                for_each_child(node, child) {
                        if (strprefixeq(child->name, node->basenamelen, "i2c-bus"))
                                return;
                }
                node->bus = &i2c_bus;
        } else
                return;

        if (!node->children)
                return;

        if (node_addr_cells(node) != 1)
                FAIL(c, dti, node, "incorrect #address-cells for I2C bus");
        if (node_size_cells(node) != 0)
                FAIL(c, dti, node, "incorrect #size-cells for I2C bus");

}
WARNING(i2c_bus_bridge, check_i2c_bus_bridge, NULL, &addr_size_cells);

static void check_i2c_bus_reg(struct check *c, struct dt_info *dti, struct node *node)
{
        struct property *prop;
        const char *unitname = get_unitname(node);
        char unit_addr[17];
        uint32_t reg = 0;
        int len;
        cell_t *cells = NULL;

        if (!node->parent || (node->parent->bus != &i2c_bus))
                return;

        prop = get_property(node, "reg");
        if (prop)
                cells = (cell_t *)prop->val.val;

        if (!cells) {
                FAIL(c, dti, node, "missing or empty reg property");
                return;
        }

        reg = fdt32_to_cpu(*cells);
        snprintf(unit_addr, sizeof(unit_addr), "%x", reg);
        if (!streq(unitname, unit_addr))
                FAIL(c, dti, node, "I2C bus unit address format error, expected \"%s\"",
                     unit_addr);

        for (len = prop->val.len; len > 0; len -= 4) {
                reg = fdt32_to_cpu(*(cells++));
                if (reg > 0x3ff)
                        FAIL_PROP(c, dti, node, prop, "I2C address must be less than 10-bits, got \"0x%x\"",
                                  reg);

        }
}
WARNING(i2c_bus_reg, check_i2c_bus_reg, NULL, &reg_format, &i2c_bus_bridge);

static const struct bus_type spi_bus = {
        .name = "spi-bus",
};

static void check_spi_bus_bridge(struct check *c, struct dt_info *dti, struct node *node)
{
        int spi_addr_cells = 1;

        if (strprefixeq(node->name, node->basenamelen, "spi")) {
                node->bus = &spi_bus;
        } else {
                /* Try to detect SPI buses which don't have proper node name */
                struct node *child;

                if (node_addr_cells(node) != 1 || node_size_cells(node) != 0)
                        return;

                for_each_child(node, child) {
                        struct property *prop;
                        for_each_property(child, prop) {
                                if (strprefixeq(prop->name, 4, "spi-")) {
                                        node->bus = &spi_bus;
                                        break;
                                }
                        }
                        if (node->bus == &spi_bus)
                                break;
                }

                if (node->bus == &spi_bus && get_property(node, "reg"))
                        FAIL(c, dti, node, "node name for SPI buses should be 'spi'");
        }
        if (node->bus != &spi_bus || !node->children)
                return;

        if (get_property(node, "spi-slave"))
                spi_addr_cells = 0;
        if (node_addr_cells(node) != spi_addr_cells)
                FAIL(c, dti, node, "incorrect #address-cells for SPI bus");
        if (node_size_cells(node) != 0)
                FAIL(c, dti, node, "incorrect #size-cells for SPI bus");

}
WARNING(spi_bus_bridge, check_spi_bus_bridge, NULL, &addr_size_cells);

static void check_spi_bus_reg(struct check *c, struct dt_info *dti, struct node *node)
{
        struct property *prop;
        const char *unitname = get_unitname(node);
        char unit_addr[9];
        uint32_t reg = 0;
        cell_t *cells = NULL;

        if (!node->parent || (node->parent->bus != &spi_bus))
                return;

        if (get_property(node->parent, "spi-slave"))
                return;

        prop = get_property(node, "reg");
        if (prop)
                cells = (cell_t *)prop->val.val;

        if (!cells) {
                FAIL(c, dti, node, "missing or empty reg property");
                return;
        }

        reg = fdt32_to_cpu(*cells);
        snprintf(unit_addr, sizeof(unit_addr), "%x", reg);
        if (!streq(unitname, unit_addr))
                FAIL(c, dti, node, "SPI bus unit address format error, expected \"%s\"",
                     unit_addr);
}
WARNING(spi_bus_reg, check_spi_bus_reg, NULL, &reg_format, &spi_bus_bridge);

static void check_unit_address_format(struct check *c, struct dt_info *dti,
                                      struct node *node)
{
        const char *unitname = get_unitname(node);

        if (node->parent && node->parent->bus)
                return;

        if (!unitname[0])
                return;

        if (!strncmp(unitname, "0x", 2)) {
                FAIL(c, dti, node, "unit name should not have leading \"0x\"");
                /* skip over 0x for next test */
                unitname += 2;
        }
        if (unitname[0] == '0' && isxdigit(unitname[1]))
                FAIL(c, dti, node, "unit name should not have leading 0s");
}
WARNING(unit_address_format, check_unit_address_format, NULL,
        &node_name_format, &pci_bridge, &simple_bus_bridge);

/*
 * Style checks
 */
static void check_avoid_default_addr_size(struct check *c, struct dt_info *dti,
                                          struct node *node)
{
        struct property *reg, *ranges;

        if (!node->parent)
                return; /* Ignore root node */

        reg = get_property(node, "reg");
        ranges = get_property(node, "ranges");

        if (!reg && !ranges)
                return;

        if (node->parent->addr_cells == -1)
                FAIL(c, dti, node, "Relying on default #address-cells value");

        if (node->parent->size_cells == -1)
                FAIL(c, dti, node, "Relying on default #size-cells value");
}
WARNING(avoid_default_addr_size, check_avoid_default_addr_size, NULL,
        &addr_size_cells);

static void check_avoid_unnecessary_addr_size(struct check *c, struct dt_info *dti,
                                              struct node *node)
{
        struct property *prop;
        struct node *child;
        bool has_reg = false;

        if (!node->parent || node->addr_cells < 0 || node->size_cells < 0)
                return;

        if (get_property(node, "ranges") || !node->children)
                return;

        for_each_child(node, child) {
                prop = get_property(child, "reg");
                if (prop)
                        has_reg = true;
        }

        if (!has_reg)
                FAIL(c, dti, node, "unnecessary #address-cells/#size-cells without \"ranges\" or child \"reg\" property");
}
WARNING(avoid_unnecessary_addr_size, check_avoid_unnecessary_addr_size, NULL, &avoid_default_addr_size);

static bool node_is_disabled(struct node *node)
{
        struct property *prop;

        prop = get_property(node, "status");
        if (prop) {
                char *str = prop->val.val;
                if (streq("disabled", str))
                        return true;
        }

        return false;
}

static void check_unique_unit_address_common(struct check *c,
                                                struct dt_info *dti,
                                                struct node *node,
                                                bool disable_check)
{
        struct node *childa;

        if (node->addr_cells < 0 || node->size_cells < 0)
                return;

        if (!node->children)
                return;

        for_each_child(node, childa) {
                struct node *childb;
                const char *addr_a = get_unitname(childa);

                if (!strlen(addr_a))
                        continue;

                if (disable_check && node_is_disabled(childa))
                        continue;

                for_each_child(node, childb) {
                        const char *addr_b = get_unitname(childb);
                        if (childa == childb)
                                break;

                        if (disable_check && node_is_disabled(childb))
                                continue;

                        if (streq(addr_a, addr_b))
                                FAIL(c, dti, childb, "duplicate unit-address (also used in node %s)", childa->fullpath);
                }
        }
}

static void check_unique_unit_address(struct check *c, struct dt_info *dti,
                                              struct node *node)
{
        check_unique_unit_address_common(c, dti, node, false);
}
WARNING(unique_unit_address, check_unique_unit_address, NULL, &avoid_default_addr_size);

static void check_unique_unit_address_if_enabled(struct check *c, struct dt_info *dti,
                                              struct node *node)
{
        check_unique_unit_address_common(c, dti, node, true);
}
CHECK_ENTRY(unique_unit_address_if_enabled, check_unique_unit_address_if_enabled,
            NULL, false, false, &avoid_default_addr_size);

static void check_obsolete_chosen_interrupt_controller(struct check *c,
                                                       struct dt_info *dti,
                                                       struct node *node)
{
        struct node *dt = dti->dt;
        struct node *chosen;
        struct property *prop;

        if (node != dt)
                return;


        chosen = get_node_by_path(dt, "/chosen");
        if (!chosen)
                return;

        prop = get_property(chosen, "interrupt-controller");
        if (prop)
                FAIL_PROP(c, dti, node, prop,
                          "/chosen has obsolete \"interrupt-controller\" property");
}
WARNING(obsolete_chosen_interrupt_controller,
        check_obsolete_chosen_interrupt_controller, NULL);

static void check_chosen_node_is_root(struct check *c, struct dt_info *dti,
                                      struct node *node)
{
        if (!streq(node->name, "chosen"))
                return;

        if (node->parent != dti->dt)
                FAIL(c, dti, node, "chosen node must be at root node");
}
WARNING(chosen_node_is_root, check_chosen_node_is_root, NULL);

static void check_chosen_node_bootargs(struct check *c, struct dt_info *dti,
                                       struct node *node)
{
        struct property *prop;

        if (!streq(node->name, "chosen"))
                return;

        prop = get_property(node, "bootargs");
        if (!prop)
                return;

        c->data = prop->name;
        check_is_string(c, dti, node);
}
WARNING(chosen_node_bootargs, check_chosen_node_bootargs, NULL);

static void check_chosen_node_stdout_path(struct check *c, struct dt_info *dti,
                                          struct node *node)
{
        struct property *prop;

        if (!streq(node->name, "chosen"))
                return;

        prop = get_property(node, "stdout-path");
        if (!prop) {
                prop = get_property(node, "linux,stdout-path");
                if (!prop)
                        return;
                FAIL_PROP(c, dti, node, prop, "Use 'stdout-path' instead");
        }

        c->data = prop->name;
        check_is_string(c, dti, node);
}
WARNING(chosen_node_stdout_path, check_chosen_node_stdout_path, NULL);

struct provider {
        const char *prop_name;
        const char *cell_name;
        bool optional;
};

static void check_property_phandle_args(struct check *c,
                                          struct dt_info *dti,
                                          struct node *node,
                                          struct property *prop,
                                          const struct provider *provider)
{
        struct node *root = dti->dt;
        int cell, cellsize = 0;

        if (prop->val.len % sizeof(cell_t)) {
                FAIL_PROP(c, dti, node, prop,
                          "property size (%d) is invalid, expected multiple of %zu",
                          prop->val.len, sizeof(cell_t));
                return;
        }

        for (cell = 0; cell < prop->val.len / sizeof(cell_t); cell += cellsize + 1) {
                struct node *provider_node;
                struct property *cellprop;
                int phandle;

                phandle = propval_cell_n(prop, cell);
                /*
                 * Some bindings use a cell value 0 or -1 to skip over optional
                 * entries when each index position has a specific definition.
                 */
                if (phandle == 0 || phandle == -1) {
                        /* Give up if this is an overlay with external references */
                        if (dti->dtsflags & DTSF_PLUGIN)
                                break;

                        cellsize = 0;
                        continue;
                }

                /* If we have markers, verify the current cell is a phandle */
                if (prop->val.markers) {
                        struct marker *m = prop->val.markers;
                        for_each_marker_of_type(m, REF_PHANDLE) {
                                if (m->offset == (cell * sizeof(cell_t)))
                                        break;
                        }
                        if (!m)
                                FAIL_PROP(c, dti, node, prop,
                                          "cell %d is not a phandle reference",
                                          cell);
                }

                provider_node = get_node_by_phandle(root, phandle);
                if (!provider_node) {
                        FAIL_PROP(c, dti, node, prop,
                                  "Could not get phandle node for (cell %d)",
                                  cell);
                        break;
                }

                cellprop = get_property(provider_node, provider->cell_name);
                if (cellprop) {
                        cellsize = propval_cell(cellprop);
                } else if (provider->optional) {
                        cellsize = 0;
                } else {
                        FAIL(c, dti, node, "Missing property '%s' in node %s or bad phandle (referred from %s[%d])",
                             provider->cell_name,
                             provider_node->fullpath,
                             prop->name, cell);
                        break;
                }

                if (prop->val.len < ((cell + cellsize + 1) * sizeof(cell_t))) {
                        FAIL_PROP(c, dti, node, prop,
                                  "property size (%d) too small for cell size %d",
                                  prop->val.len, cellsize);
                }
        }
}

static void check_provider_cells_property(struct check *c,
                                          struct dt_info *dti,
                                          struct node *node)
{
        struct provider *provider = c->data;
        struct property *prop;

        prop = get_property(node, provider->prop_name);
        if (!prop)
                return;

        check_property_phandle_args(c, dti, node, prop, provider);
}
#define WARNING_PROPERTY_PHANDLE_CELLS(nm, propname, cells_name, ...) \
        static struct provider nm##_provider = { (propname), (cells_name), __VA_ARGS__ }; \
        WARNING(nm##_property, check_provider_cells_property, &nm##_provider, &phandle_references);

WARNING_PROPERTY_PHANDLE_CELLS(clocks, "clocks", "#clock-cells");
WARNING_PROPERTY_PHANDLE_CELLS(cooling_device, "cooling-device", "#cooling-cells");
WARNING_PROPERTY_PHANDLE_CELLS(dmas, "dmas", "#dma-cells");
WARNING_PROPERTY_PHANDLE_CELLS(hwlocks, "hwlocks", "#hwlock-cells");
WARNING_PROPERTY_PHANDLE_CELLS(interrupts_extended, "interrupts-extended", "#interrupt-cells");
WARNING_PROPERTY_PHANDLE_CELLS(io_channels, "io-channels", "#io-channel-cells");
WARNING_PROPERTY_PHANDLE_CELLS(iommus, "iommus", "#iommu-cells");
WARNING_PROPERTY_PHANDLE_CELLS(mboxes, "mboxes", "#mbox-cells");
WARNING_PROPERTY_PHANDLE_CELLS(msi_parent, "msi-parent", "#msi-cells", true);
WARNING_PROPERTY_PHANDLE_CELLS(mux_controls, "mux-controls", "#mux-control-cells");
WARNING_PROPERTY_PHANDLE_CELLS(phys, "phys", "#phy-cells");
WARNING_PROPERTY_PHANDLE_CELLS(power_domains, "power-domains", "#power-domain-cells");
WARNING_PROPERTY_PHANDLE_CELLS(pwms, "pwms", "#pwm-cells");
WARNING_PROPERTY_PHANDLE_CELLS(resets, "resets", "#reset-cells");
WARNING_PROPERTY_PHANDLE_CELLS(sound_dai, "sound-dai", "#sound-dai-cells");
WARNING_PROPERTY_PHANDLE_CELLS(thermal_sensors, "thermal-sensors", "#thermal-sensor-cells");

static bool prop_is_gpio(struct property *prop)
{
        char *str;

        /*
         * *-gpios and *-gpio can appear in property names,
         * so skip over any false matches (only one known ATM)
         */
        if (strstr(prop->name, "nr-gpio"))
                return false;

        str = strrchr(prop->name, '-');
        if (str)
                str++;
        else
                str = prop->name;
        if (!(streq(str, "gpios") || streq(str, "gpio")))
                return false;

        return true;
}

static void check_gpios_property(struct check *c,
                                          struct dt_info *dti,
                                          struct node *node)
{
        struct property *prop;

        /* Skip GPIO hog nodes which have 'gpios' property */
        if (get_property(node, "gpio-hog"))
                return;

        for_each_property(node, prop) {
                struct provider provider;

                if (!prop_is_gpio(prop))
                        continue;

                provider.prop_name = prop->name;
                provider.cell_name = "#gpio-cells";
                provider.optional = false;
                check_property_phandle_args(c, dti, node, prop, &provider);
        }

}
WARNING(gpios_property, check_gpios_property, NULL, &phandle_references);

static void check_deprecated_gpio_property(struct check *c,
                                           struct dt_info *dti,
                                           struct node *node)
{
        struct property *prop;

        for_each_property(node, prop) {
                char *str;

                if (!prop_is_gpio(prop))
                        continue;

                str = strstr(prop->name, "gpio");
                if (!streq(str, "gpio"))
                        continue;

                FAIL_PROP(c, dti, node, prop,
                          "'[*-]gpio' is deprecated, use '[*-]gpios' instead");
        }

}
CHECK(deprecated_gpio_property, check_deprecated_gpio_property, NULL);

static bool node_is_interrupt_provider(struct node *node)
{
        struct property *prop;

        prop = get_property(node, "interrupt-controller");
        if (prop)
                return true;

        prop = get_property(node, "interrupt-map");
        if (prop)
                return true;

        return false;
}
static void check_interrupts_property(struct check *c,
                                      struct dt_info *dti,
                                      struct node *node)
{
        struct node *root = dti->dt;
        struct node *irq_node = NULL, *parent = node;
        struct property *irq_prop, *prop = NULL;
        int irq_cells, phandle;

        irq_prop = get_property(node, "interrupts");
        if (!irq_prop)
                return;

        if (irq_prop->val.len % sizeof(cell_t))
                FAIL_PROP(c, dti, node, irq_prop, "size (%d) is invalid, expected multiple of %zu",
                     irq_prop->val.len, sizeof(cell_t));

        while (parent && !prop) {
                if (parent != node && node_is_interrupt_provider(parent)) {
                        irq_node = parent;
                        break;
                }

                prop = get_property(parent, "interrupt-parent");
                if (prop) {
                        phandle = propval_cell(prop);
                        if ((phandle == 0) || (phandle == -1)) {
                                /* Give up if this is an overlay with
                                 * external references */
                                if (dti->dtsflags & DTSF_PLUGIN)
                                        return;
                                FAIL_PROP(c, dti, parent, prop, "Invalid phandle");
                                continue;
                        }

                        irq_node = get_node_by_phandle(root, phandle);
                        if (!irq_node) {
                                FAIL_PROP(c, dti, parent, prop, "Bad phandle");
                                return;
                        }
                        if (!node_is_interrupt_provider(irq_node))
                                FAIL(c, dti, irq_node,
                                     "Missing interrupt-controller or interrupt-map property");

                        break;
                }

                parent = parent->parent;
        }

        if (!irq_node) {
                FAIL(c, dti, node, "Missing interrupt-parent");
                return;
        }

        prop = get_property(irq_node, "#interrupt-cells");
        if (!prop) {
                FAIL(c, dti, irq_node, "Missing #interrupt-cells in interrupt-parent");
                return;
        }

        irq_cells = propval_cell(prop);
        if (irq_prop->val.len % (irq_cells * sizeof(cell_t))) {
                FAIL_PROP(c, dti, node, prop,
                          "size is (%d), expected multiple of %d",
                          irq_prop->val.len, (int)(irq_cells * sizeof(cell_t)));
        }
}
WARNING(interrupts_property, check_interrupts_property, &phandle_references);

static const struct bus_type graph_port_bus = {
        .name = "graph-port",
};

static const struct bus_type graph_ports_bus = {
        .name = "graph-ports",
};

static void check_graph_nodes(struct check *c, struct dt_info *dti,
                              struct node *node)
{
        struct node *child;

        for_each_child(node, child) {
                if (!(strprefixeq(child->name, child->basenamelen, "endpoint") ||
                      get_property(child, "remote-endpoint")))
                        continue;

                node->bus = &graph_port_bus;

                /* The parent of 'port' nodes can be either 'ports' or a device */
                if (!node->parent->bus &&
                    (streq(node->parent->name, "ports") || get_property(node, "reg")))
                        node->parent->bus = &graph_ports_bus;

                break;
        }

}
WARNING(graph_nodes, check_graph_nodes, NULL);

static void check_graph_child_address(struct check *c, struct dt_info *dti,
                                      struct node *node)
{
        int cnt = 0;
        struct node *child;

        if (node->bus != &graph_ports_bus && node->bus != &graph_port_bus)
                return;

        for_each_child(node, child) {
                struct property *prop = get_property(child, "reg");

                /* No error if we have any non-zero unit address */
                if (prop && propval_cell(prop) != 0)
                        return;

                cnt++;
        }

        if (cnt == 1 && node->addr_cells != -1)
                FAIL(c, dti, node, "graph node has single child node '%s', #address-cells/#size-cells are not necessary",
                     node->children->name);
}
WARNING(graph_child_address, check_graph_child_address, NULL, &graph_nodes);

static void check_graph_reg(struct check *c, struct dt_info *dti,
                            struct node *node)
{
        char unit_addr[9];
        const char *unitname = get_unitname(node);
        struct property *prop;

        prop = get_property(node, "reg");
        if (!prop || !unitname)
                return;

        if (!(prop->val.val && prop->val.len == sizeof(cell_t))) {
                FAIL(c, dti, node, "graph node malformed 'reg' property");
                return;
        }

        snprintf(unit_addr, sizeof(unit_addr), "%x", propval_cell(prop));
        if (!streq(unitname, unit_addr))
                FAIL(c, dti, node, "graph node unit address error, expected \"%s\"",
                     unit_addr);

        if (node->parent->addr_cells != 1)
                FAIL_PROP(c, dti, node, get_property(node, "#address-cells"),
                          "graph node '#address-cells' is %d, must be 1",
                          node->parent->addr_cells);
        if (node->parent->size_cells != 0)
                FAIL_PROP(c, dti, node, get_property(node, "#size-cells"),
                          "graph node '#size-cells' is %d, must be 0",
                          node->parent->size_cells);
}

static void check_graph_port(struct check *c, struct dt_info *dti,
                             struct node *node)
{
        if (node->bus != &graph_port_bus)
                return;

        if (!strprefixeq(node->name, node->basenamelen, "port"))
                FAIL(c, dti, node, "graph port node name should be 'port'");

        check_graph_reg(c, dti, node);
}
WARNING(graph_port, check_graph_port, NULL, &graph_nodes);

static struct node *get_remote_endpoint(struct check *c, struct dt_info *dti,
                                        struct node *endpoint)
{
        int phandle;
        struct node *node;
        struct property *prop;

        prop = get_property(endpoint, "remote-endpoint");
        if (!prop)
                return NULL;

        phandle = propval_cell(prop);
        /* Give up if this is an overlay with external references */
        if (phandle == 0 || phandle == -1)
                return NULL;

        node = get_node_by_phandle(dti->dt, phandle);
        if (!node)
                FAIL_PROP(c, dti, endpoint, prop, "graph phandle is not valid");

        return node;
}

static void check_graph_endpoint(struct check *c, struct dt_info *dti,
                                 struct node *node)
{
        struct node *remote_node;

        if (!node->parent || node->parent->bus != &graph_port_bus)
                return;

        if (!strprefixeq(node->name, node->basenamelen, "endpoint"))
                FAIL(c, dti, node, "graph endpoint node name should be 'endpoint'");

        check_graph_reg(c, dti, node);

        remote_node = get_remote_endpoint(c, dti, node);
        if (!remote_node)
                return;

        if (get_remote_endpoint(c, dti, remote_node) != node)
                FAIL(c, dti, node, "graph connection to node '%s' is not bidirectional",
                     remote_node->fullpath);
}
WARNING(graph_endpoint, check_graph_endpoint, NULL, &graph_nodes);

static struct check *check_table[] = {
        &duplicate_node_names, &duplicate_property_names,
        &node_name_chars, &node_name_format, &property_name_chars,
        &name_is_string, &name_properties,

        &duplicate_label,

        &explicit_phandles,
        &phandle_references, &path_references,
        &omit_unused_nodes,

        &address_cells_is_cell, &size_cells_is_cell, &interrupt_cells_is_cell,
        &device_type_is_string, &model_is_string, &status_is_string,
        &label_is_string,

        &compatible_is_string_list, &names_is_string_list,

        &property_name_chars_strict,
        &node_name_chars_strict,

        &addr_size_cells, &reg_format, &ranges_format,

        &unit_address_vs_reg,
        &unit_address_format,

        &pci_bridge,
        &pci_device_reg,
        &pci_device_bus_num,

        &simple_bus_bridge,
        &simple_bus_reg,

        &i2c_bus_bridge,
        &i2c_bus_reg,

        &spi_bus_bridge,
        &spi_bus_reg,

        &avoid_default_addr_size,
        &avoid_unnecessary_addr_size,
        &unique_unit_address,
        &unique_unit_address_if_enabled,
        &obsolete_chosen_interrupt_controller,
        &chosen_node_is_root, &chosen_node_bootargs, &chosen_node_stdout_path,

        &clocks_property,
        &cooling_device_property,
        &dmas_property,
        &hwlocks_property,
        &interrupts_extended_property,
        &io_channels_property,
        &iommus_property,
        &mboxes_property,
        &msi_parent_property,
        &mux_controls_property,
        &phys_property,
        &power_domains_property,
        &pwms_property,
        &resets_property,
        &sound_dai_property,
        &thermal_sensors_property,

        &deprecated_gpio_property,
        &gpios_property,
        &interrupts_property,

        &alias_paths,

        &graph_nodes, &graph_child_address, &graph_port, &graph_endpoint,

        &always_fail,
};

static void enable_warning_error(struct check *c, bool warn, bool error)
{
        int i;

        /* Raising level, also raise it for prereqs */
        if ((warn && !c->warn) || (error && !c->error))
                for (i = 0; i < c->num_prereqs; i++)
                        enable_warning_error(c->prereq[i], warn, error);

        c->warn = c->warn || warn;
        c->error = c->error || error;
}

static void disable_warning_error(struct check *c, bool warn, bool error)
{
        int i;

        /* Lowering level, also lower it for things this is the prereq
         * for */
        if ((warn && c->warn) || (error && c->error)) {
                for (i = 0; i < ARRAY_SIZE(check_table); i++) {
                        struct check *cc = check_table[i];
                        int j;

                        for (j = 0; j < cc->num_prereqs; j++)
                                if (cc->prereq[j] == c)
                                        disable_warning_error(cc, warn, error);
                }
        }

        c->warn = c->warn && !warn;
        c->error = c->error && !error;
}

void parse_checks_option(bool warn, bool error, const char *arg)
{
        int i;
        const char *name = arg;
        bool enable = true;

        if ((strncmp(arg, "no-", 3) == 0)
            || (strncmp(arg, "no_", 3) == 0)) {
                name = arg + 3;
                enable = false;
        }

        for (i = 0; i < ARRAY_SIZE(check_table); i++) {
                struct check *c = check_table[i];

                if (streq(c->name, name)) {
                        if (enable)
                                enable_warning_error(c, warn, error);
                        else
                                disable_warning_error(c, warn, error);
                        return;
                }
        }

        die("Unrecognized check name \"%s\"\n", name);
}

void process_checks(bool force, struct dt_info *dti)
{
        int i;
        int error = 0;

        for (i = 0; i < ARRAY_SIZE(check_table); i++) {
                struct check *c = check_table[i];

                if (c->warn || c->error)
                        error = error || run_check(c, dti);
        }

        if (error) {
                if (!force) {
                        fprintf(stderr, "ERROR: Input tree has errors, aborting "
                                "(use -f to force output)\n");
                        exit(2);
                } else if (quiet < 3) {
                        fprintf(stderr, "Warning: Input tree has errors, "
                                "output forced\n");
                }
        }
}