// SPDX-License-Identifier: GPL-2.0+
/*
 * Device manager
 *
 * Copyright (c) 2013 Google, Inc
 *
 * (C) Copyright 2012
 * Pavel Herrmann <morpheus.ibis@gmail.com>
 */

#include <common.h>
#include <cpu_func.h>
#include <log.h>
#include <asm/global_data.h>
#include <asm/io.h>
#include <clk.h>
#include <fdtdec.h>
#include <fdt_support.h>
#include <malloc.h>
#include <asm/cache.h>
#include <dm/device.h>
#include <dm/device-internal.h>
#include <dm/lists.h>
#include <dm/of_access.h>
#include <dm/pinctrl.h>
#include <dm/platdata.h>
#include <dm/read.h>
#include <dm/uclass.h>
#include <dm/uclass-internal.h>
#include <dm/util.h>
#include <iommu.h>
#include <linux/err.h>
#include <linux/list.h>
#include <power-domain.h>

DECLARE_GLOBAL_DATA_PTR;

static int device_bind_common(struct udevice *parent, const struct driver *drv,
                              const char *name, void *plat,
                              ulong driver_data, ofnode node,
                              uint of_plat_size, struct udevice **devp)
{
        struct udevice *dev;
        struct uclass *uc;
        int size, ret = 0;
        bool auto_seq = true;
        void *ptr;

        if (CONFIG_IS_ENABLED(OF_PLATDATA_NO_BIND))
                return -ENOSYS;

        if (devp)
                *devp = NULL;
        if (!name)
                return -EINVAL;

        ret = uclass_get(drv->id, &uc);
        if (ret) {
                debug("Missing uclass for driver %s\n", drv->name);
                return ret;
        }

        dev = calloc(1, sizeof(struct udevice));
        if (!dev)
                return -ENOMEM;

        INIT_LIST_HEAD(&dev->sibling_node);
        INIT_LIST_HEAD(&dev->child_head);
        INIT_LIST_HEAD(&dev->uclass_node);
#ifdef CONFIG_DEVRES
        INIT_LIST_HEAD(&dev->devres_head);
#endif
        dev_set_plat(dev, plat);
        dev->driver_data = driver_data;
        dev->name = name;
        dev_set_ofnode(dev, node);
        dev->parent = parent;
        dev->driver = drv;
        dev->uclass = uc;

        dev->seq_ = -1;
        if (CONFIG_IS_ENABLED(DM_SEQ_ALIAS) &&
            (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS)) {
                /*
                 * Some devices, such as a SPI bus, I2C bus and serial ports
                 * are numbered using aliases.
                 */
                if (CONFIG_IS_ENABLED(OF_CONTROL) &&
                    !CONFIG_IS_ENABLED(OF_PLATDATA)) {
                        if (uc->uc_drv->name && ofnode_valid(node)) {
                                if (!dev_read_alias_seq(dev, &dev->seq_)) {
                                        auto_seq = false;
                                        log_debug("   - seq=%d\n", dev->seq_);
                                        }
                        }
                }
        }
        if (auto_seq && !(uc->uc_drv->flags & DM_UC_FLAG_NO_AUTO_SEQ))
                dev->seq_ = uclass_find_next_free_seq(uc);

        /* Check if we need to allocate plat */
        if (drv->plat_auto) {
                bool alloc = !plat;

                /*
                 * For of-platdata, we try use the existing data, but if
                 * plat_auto is larger, we must allocate a new space
                 */
                if (CONFIG_IS_ENABLED(OF_PLATDATA)) {
                        if (of_plat_size)
                                dev_or_flags(dev, DM_FLAG_OF_PLATDATA);
                        if (of_plat_size < drv->plat_auto)
                                alloc = true;
                }
                if (alloc) {
                        dev_or_flags(dev, DM_FLAG_ALLOC_PDATA);
                        ptr = calloc(1, drv->plat_auto);
                        if (!ptr) {
                                ret = -ENOMEM;
                                goto fail_alloc1;
                        }

                        /*
                         * For of-platdata, copy the old plat into the new
                         * space
                         */
                        if (CONFIG_IS_ENABLED(OF_PLATDATA) && plat)
                                memcpy(ptr, plat, of_plat_size);
                        dev_set_plat(dev, ptr);
                }
        }

        size = uc->uc_drv->per_device_plat_auto;
        if (size) {
                dev_or_flags(dev, DM_FLAG_ALLOC_UCLASS_PDATA);
                ptr = calloc(1, size);
                if (!ptr) {
                        ret = -ENOMEM;
                        goto fail_alloc2;
                }
                dev_set_uclass_plat(dev, ptr);
        }

        if (parent) {
                size = parent->driver->per_child_plat_auto;
                if (!size)
                        size = parent->uclass->uc_drv->per_child_plat_auto;
                if (size) {
                        dev_or_flags(dev, DM_FLAG_ALLOC_PARENT_PDATA);
                        ptr = calloc(1, size);
                        if (!ptr) {
                                ret = -ENOMEM;
                                goto fail_alloc3;
                        }
                        dev_set_parent_plat(dev, ptr);
                }
                /* put dev into parent's successor list */
                list_add_tail(&dev->sibling_node, &parent->child_head);
        }

        ret = uclass_bind_device(dev);
        if (ret)
                goto fail_uclass_bind;

        /* if we fail to bind we remove device from successors and free it */
        if (drv->bind) {
                ret = drv->bind(dev);
                if (ret)
                        goto fail_bind;
        }
        if (parent && parent->driver->child_post_bind) {
                ret = parent->driver->child_post_bind(dev);
                if (ret)
                        goto fail_child_post_bind;
        }
        if (uc->uc_drv->post_bind) {
                ret = uc->uc_drv->post_bind(dev);
                if (ret)
                        goto fail_uclass_post_bind;
        }

        if (parent)
                pr_debug("Bound device %s to %s\n", dev->name, parent->name);
        if (devp)
                *devp = dev;

        dev_or_flags(dev, DM_FLAG_BOUND);

        return 0;

fail_uclass_post_bind:
        /* There is no child unbind() method, so no clean-up required */
fail_child_post_bind:
        if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
                if (drv->unbind && drv->unbind(dev)) {
                        dm_warn("unbind() method failed on dev '%s' on error path\n",
                                dev->name);
                }
        }

fail_bind:
        if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
                if (uclass_unbind_device(dev)) {
                        dm_warn("Failed to unbind dev '%s' on error path\n",
                                dev->name);
                }
        }
fail_uclass_bind:
        if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
                list_del(&dev->sibling_node);
                if (dev_get_flags(dev) & DM_FLAG_ALLOC_PARENT_PDATA) {
                        free(dev_get_parent_plat(dev));
                        dev_set_parent_plat(dev, NULL);
                }
        }
fail_alloc3:
        if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
                if (dev_get_flags(dev) & DM_FLAG_ALLOC_UCLASS_PDATA) {
                        free(dev_get_uclass_plat(dev));
                        dev_set_uclass_plat(dev, NULL);
                }
        }
fail_alloc2:
        if (CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)) {
                if (dev_get_flags(dev) & DM_FLAG_ALLOC_PDATA) {
                        free(dev_get_plat(dev));
                        dev_set_plat(dev, NULL);
                }
        }
fail_alloc1:
        devres_release_all(dev);

        free(dev);

        return ret;
}

int device_bind_with_driver_data(struct udevice *parent,
                                 const struct driver *drv, const char *name,
                                 ulong driver_data, ofnode node,
                                 struct udevice **devp)
{
        return device_bind_common(parent, drv, name, NULL, driver_data, node,
                                  0, devp);
}

int device_bind(struct udevice *parent, const struct driver *drv,
                const char *name, void *plat, ofnode node,
                struct udevice **devp)
{
        return device_bind_common(parent, drv, name, plat, 0, node, 0,
                                  devp);
}

int device_bind_by_name(struct udevice *parent, bool pre_reloc_only,
                        const struct driver_info *info, struct udevice **devp)
{
        struct driver *drv;
        uint plat_size = 0;
        int ret;

        drv = lists_driver_lookup_name(info->name);
        if (!drv)
                return -ENOENT;
        if (pre_reloc_only && !(drv->flags & DM_FLAG_PRE_RELOC))
                return -EPERM;

#if CONFIG_IS_ENABLED(OF_PLATDATA)
        plat_size = info->plat_size;
#endif
        ret = device_bind_common(parent, drv, info->name, (void *)info->plat, 0,
                                 ofnode_null(), plat_size, devp);
        if (ret)
                return ret;

        return ret;
}

int device_reparent(struct udevice *dev, struct udevice *new_parent)
{
        struct udevice *pos, *n;

        assert(dev);
        assert(new_parent);

        list_for_each_entry_safe(pos, n, &dev->parent->child_head,
                                 sibling_node) {
                if (pos->driver != dev->driver)
                        continue;

                list_del(&dev->sibling_node);
                list_add_tail(&dev->sibling_node, &new_parent->child_head);
                dev->parent = new_parent;

                break;
        }

        return 0;
}

static void *alloc_priv(int size, uint flags)
{
        void *priv;

        if (flags & DM_FLAG_ALLOC_PRIV_DMA) {
                size = ROUND(size, ARCH_DMA_MINALIGN);
                priv = memalign(ARCH_DMA_MINALIGN, size);
                if (priv) {
                        memset(priv, '\0', size);

                        /*
                         * Ensure that the zero bytes are flushed to memory.
                         * This prevents problems if the driver uses this as
                         * both an input and an output buffer:
                         *
                         * 1. Zeroes written to buffer (here) and sit in the
                         *      cache
                         * 2. Driver issues a read command to DMA
                         * 3. CPU runs out of cache space and evicts some cache
                         *      data in the buffer, writing zeroes to RAM from
                         *      the memset() above
                         * 4. DMA completes
                         * 5. Buffer now has some DMA data and some zeroes
                         * 6. Data being read is now incorrect
                         *
                         * To prevent this, ensure that the cache is clean
                         * within this range at the start. The driver can then
                         * use normal flush-after-write, invalidate-before-read
                         * procedures.
                         *
                         * TODO(sjg@chromium.org): Drop this microblaze
                         * exception.
                         */
#ifndef CONFIG_MICROBLAZE
                        flush_dcache_range((ulong)priv, (ulong)priv + size);
#endif
                }
        } else {
                priv = calloc(1, size);
        }

        return priv;
}

/**
 * device_alloc_priv() - Allocate priv/plat data required by the device
 *
 * @dev: Device to process
 * @return 0 if OK, -ENOMEM if out of memory
 */
static int device_alloc_priv(struct udevice *dev)
{
        const struct driver *drv;
        void *ptr;
        int size;

        drv = dev->driver;
        assert(drv);

        /* Allocate private data if requested and not reentered */
        if (drv->priv_auto && !dev_get_priv(dev)) {
                ptr = alloc_priv(drv->priv_auto, drv->flags);
                if (!ptr)
                        return -ENOMEM;
                dev_set_priv(dev, ptr);
        }

        /* Allocate private data if requested and not reentered */
        size = dev->uclass->uc_drv->per_device_auto;
        if (size && !dev_get_uclass_priv(dev)) {
                ptr = alloc_priv(size, dev->uclass->uc_drv->flags);
                if (!ptr)
                        return -ENOMEM;
                dev_set_uclass_priv(dev, ptr);
        }

        /* Allocate parent data for this child */
        if (dev->parent) {
                size = dev->parent->driver->per_child_auto;
                if (!size)
                        size = dev->parent->uclass->uc_drv->per_child_auto;
                if (size && !dev_get_parent_priv(dev)) {
                        ptr = alloc_priv(size, drv->flags);
                        if (!ptr)
                                return -ENOMEM;
                        dev_set_parent_priv(dev, ptr);
                }
        }

        return 0;
}

int device_of_to_plat(struct udevice *dev)
{
        const struct driver *drv;
        int ret;

        if (!dev)
                return -EINVAL;

        if (dev_get_flags(dev) & DM_FLAG_PLATDATA_VALID)
                return 0;

        /*
         * This is not needed if binding is disabled, since data is allocated
         * at build time.
         */
        if (!CONFIG_IS_ENABLED(OF_PLATDATA_NO_BIND)) {
                /* Ensure all parents have ofdata */
                if (dev->parent) {
                        ret = device_of_to_plat(dev->parent);
                        if (ret)
                                goto fail;

                        /*
                         * The device might have already been probed during
                         * the call to device_probe() on its parent device
                         * (e.g. PCI bridge devices). Test the flags again
                         * so that we don't mess up the device.
                         */
                        if (dev_get_flags(dev) & DM_FLAG_PLATDATA_VALID)
                                return 0;
                }

                ret = device_alloc_priv(dev);
                if (ret)
                        goto fail;
        }
        drv = dev->driver;
        assert(drv);

        if (drv->of_to_plat &&
            (CONFIG_IS_ENABLED(OF_PLATDATA) || dev_has_ofnode(dev))) {
                ret = drv->of_to_plat(dev);
                if (ret)
                        goto fail;
        }

        dev_or_flags(dev, DM_FLAG_PLATDATA_VALID);

        return 0;
fail:
        device_free(dev);

        return ret;
}

/**
 * device_get_dma_constraints() - Populate device's DMA constraints
 *
 * Gets a device's DMA constraints from firmware. This information is later
 * used by drivers to translate physcal addresses to the device's bus address
 * space. For now only device-tree is supported.
 *
 * @dev: Pointer to target device
 * Return: 0 if OK or if no DMA constraints were found, error otherwise
 */
static int device_get_dma_constraints(struct udevice *dev)
{
        struct udevice *parent = dev->parent;
        phys_addr_t cpu = 0;
        dma_addr_t bus = 0;
        u64 size = 0;
        int ret;

        if (!CONFIG_IS_ENABLED(DM_DMA) || !parent || !dev_has_ofnode(parent))
                return 0;

        /*
         * We start parsing for dma-ranges from the device's bus node. This is
         * specially important on nested buses.
         */
        ret = dev_get_dma_range(parent, &cpu, &bus, &size);
        /* Don't return an error if no 'dma-ranges' were found */
        if (ret && ret != -ENOENT) {
                dm_warn("%s: failed to get DMA range, %d\n", dev->name, ret);
                return ret;
        }

        dev_set_dma_offset(dev, cpu - bus);

        return 0;
}

int device_probe(struct udevice *dev)
{
        const struct driver *drv;
        int ret;

        if (!dev)
                return -EINVAL;

        if (dev_get_flags(dev) & DM_FLAG_ACTIVATED)
                return 0;

        drv = dev->driver;
        assert(drv);

        ret = device_of_to_plat(dev);
        if (ret)
                goto fail;

        /* Ensure all parents are probed */
        if (dev->parent) {
                ret = device_probe(dev->parent);
                if (ret)
                        goto fail;

                /*
                 * The device might have already been probed during
                 * the call to device_probe() on its parent device
                 * (e.g. PCI bridge devices). Test the flags again
                 * so that we don't mess up the device.
                 */
                if (dev_get_flags(dev) & DM_FLAG_ACTIVATED)
                        return 0;
        }

        dev_or_flags(dev, DM_FLAG_ACTIVATED);

        /*
         * Process pinctrl for everything except the root device, and
         * continue regardless of the result of pinctrl. Don't process pinctrl
         * settings for pinctrl devices since the device may not yet be
         * probed.
         *
         * This call can produce some non-intuitive results. For example, on an
         * x86 device where dev is the main PCI bus, the pinctrl device may be
         * child or grandchild of that bus, meaning that the child will be
         * probed here. If the child happens to be the P2SB and the pinctrl
         * device is a child of that, then both the pinctrl and P2SB will be
         * probed by this call. This works because the DM_FLAG_ACTIVATED flag
         * is set just above. However, the PCI bus' probe() method and
         * associated uclass methods have not yet been called.
         */
        if (dev->parent && device_get_uclass_id(dev) != UCLASS_PINCTRL)
                pinctrl_select_state(dev, "default");

        if (CONFIG_IS_ENABLED(POWER_DOMAIN) && dev->parent &&
            (device_get_uclass_id(dev) != UCLASS_POWER_DOMAIN) &&
            !(drv->flags & DM_FLAG_DEFAULT_PD_CTRL_OFF)) {
                ret = dev_power_domain_on(dev);
                if (ret)
                        goto fail;
        }

        if (CONFIG_IS_ENABLED(IOMMU) && dev->parent &&
            (device_get_uclass_id(dev) != UCLASS_IOMMU)) {
                ret = dev_iommu_enable(dev);
                if (ret)
                        goto fail;
        }

        ret = device_get_dma_constraints(dev);
        if (ret)
                goto fail;

        ret = uclass_pre_probe_device(dev);
        if (ret)
                goto fail;

        if (dev->parent && dev->parent->driver->child_pre_probe) {
                ret = dev->parent->driver->child_pre_probe(dev);
                if (ret)
                        goto fail;
        }

        /* Only handle devices that have a valid ofnode */
        if (dev_has_ofnode(dev)) {
                /*
                 * Process 'assigned-{clocks/clock-parents/clock-rates}'
                 * properties
                 */
                ret = clk_set_defaults(dev, CLK_DEFAULTS_PRE);
                if (ret)
                        goto fail;
        }

        if (drv->probe) {
                ret = drv->probe(dev);
                if (ret)
                        goto fail;
        }

        ret = uclass_post_probe_device(dev);
        if (ret)
                goto fail_uclass;

        if (dev->parent && device_get_uclass_id(dev) == UCLASS_PINCTRL)
                pinctrl_select_state(dev, "default");

        return 0;
fail_uclass:
        if (device_remove(dev, DM_REMOVE_NORMAL)) {
                dm_warn("%s: Device '%s' failed to remove on error path\n",
                        __func__, dev->name);
        }
fail:
        dev_bic_flags(dev, DM_FLAG_ACTIVATED);

        device_free(dev);

        return ret;
}

void *dev_get_plat(const struct udevice *dev)
{
        if (!dev) {
                dm_warn("%s: null device\n", __func__);
                return NULL;
        }

        return dm_priv_to_rw(dev->plat_);
}

void *dev_get_parent_plat(const struct udevice *dev)
{
        if (!dev) {
                dm_warn("%s: null device\n", __func__);
                return NULL;
        }

        return dm_priv_to_rw(dev->parent_plat_);
}

void *dev_get_uclass_plat(const struct udevice *dev)
{
        if (!dev) {
                dm_warn("%s: null device\n", __func__);
                return NULL;
        }

        return dm_priv_to_rw(dev->uclass_plat_);
}

void *dev_get_priv(const struct udevice *dev)
{
        if (!dev) {
                dm_warn("%s: null device\n", __func__);
                return NULL;
        }

        return dm_priv_to_rw(dev->priv_);
}

void *dev_get_uclass_priv(const struct udevice *dev)
{
        if (!dev) {
                dm_warn("%s: null device\n", __func__);
                return NULL;
        }

        return dm_priv_to_rw(dev->uclass_priv_);
}

void *dev_get_parent_priv(const struct udevice *dev)
{
        if (!dev) {
                dm_warn("%s: null device\n", __func__);
                return NULL;
        }

        return dm_priv_to_rw(dev->parent_priv_);
}

static int device_get_device_tail(struct udevice *dev, int ret,
                                  struct udevice **devp)
{
        if (ret)
                return ret;

        ret = device_probe(dev);
        if (ret)
                return ret;

        *devp = dev;

        return 0;
}

#if CONFIG_IS_ENABLED(OF_REAL)
/**
 * device_find_by_ofnode() - Return device associated with given ofnode
 *
 * The returned device is *not* activated.
 *
 * @node: The ofnode for which a associated device should be looked up
 * @devp: Pointer to structure to hold the found device
 * Return: 0 if OK, -ve on error
 */
static int device_find_by_ofnode(ofnode node, struct udevice **devp)
{
        struct uclass *uc;
        struct udevice *dev;
        int ret;

        list_for_each_entry(uc, gd->uclass_root, sibling_node) {
                ret = uclass_find_device_by_ofnode(uc->uc_drv->id, node,
                                                   &dev);
                if (!ret || dev) {
                        *devp = dev;
                        return 0;
                }
        }

        return -ENODEV;
}
#endif

int device_get_child(const struct udevice *parent, int index,
                     struct udevice **devp)
{
        struct udevice *dev;

        list_for_each_entry(dev, &parent->child_head, sibling_node) {
                if (!index--)
                        return device_get_device_tail(dev, 0, devp);
        }

        return -ENODEV;
}

int device_get_child_count(const struct udevice *parent)
{
        struct udevice *dev;
        int count = 0;

        list_for_each_entry(dev, &parent->child_head, sibling_node)
                count++;

        return count;
}

int device_find_child_by_seq(const struct udevice *parent, int seq,
                             struct udevice **devp)
{
        struct udevice *dev;

        *devp = NULL;

        list_for_each_entry(dev, &parent->child_head, sibling_node) {
                if (dev->seq_ == seq) {
                        *devp = dev;
                        return 0;
                }
        }

        return -ENODEV;
}

int device_get_child_by_seq(const struct udevice *parent, int seq,
                            struct udevice **devp)
{
        struct udevice *dev;
        int ret;

        *devp = NULL;
        ret = device_find_child_by_seq(parent, seq, &dev);

        return device_get_device_tail(dev, ret, devp);
}

int device_find_child_by_of_offset(const struct udevice *parent, int of_offset,
                                   struct udevice **devp)
{
        struct udevice *dev;

        *devp = NULL;

        list_for_each_entry(dev, &parent->child_head, sibling_node) {
                if (dev_of_offset(dev) == of_offset) {
                        *devp = dev;
                        return 0;
                }
        }

        return -ENODEV;
}

int device_get_child_by_of_offset(const struct udevice *parent, int node,
                                  struct udevice **devp)
{
        struct udevice *dev;
        int ret;

        *devp = NULL;
        ret = device_find_child_by_of_offset(parent, node, &dev);
        return device_get_device_tail(dev, ret, devp);
}

static struct udevice *_device_find_global_by_ofnode(struct udevice *parent,
                                                     ofnode ofnode)
{
        struct udevice *dev, *found;

        if (ofnode_equal(dev_ofnode(parent), ofnode))
                return parent;

        list_for_each_entry(dev, &parent->child_head, sibling_node) {
                found = _device_find_global_by_ofnode(dev, ofnode);
                if (found)
                        return found;
        }

        return NULL;
}

int device_find_global_by_ofnode(ofnode ofnode, struct udevice **devp)
{
        *devp = _device_find_global_by_ofnode(gd->dm_root, ofnode);

        return *devp ? 0 : -ENOENT;
}

int device_get_global_by_ofnode(ofnode ofnode, struct udevice **devp)
{
        struct udevice *dev;

        dev = _device_find_global_by_ofnode(gd->dm_root, ofnode);
        return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
}

#if CONFIG_IS_ENABLED(OF_PLATDATA)
int device_get_by_ofplat_idx(uint idx, struct udevice **devp)
{
        struct udevice *dev;

        if (CONFIG_IS_ENABLED(OF_PLATDATA_INST)) {
                struct udevice *base = ll_entry_start(struct udevice, udevice);

                dev = base + idx;
        } else {
                struct driver_rt *drt = gd_dm_driver_rt() + idx;

                dev = drt->dev;
        }
        *devp = NULL;

        return device_get_device_tail(dev, dev ? 0 : -ENOENT, devp);
}
#endif

int device_find_first_child(const struct udevice *parent, struct udevice **devp)
{
        if (list_empty(&parent->child_head)) {
                *devp = NULL;
        } else {
                *devp = list_first_entry(&parent->child_head, struct udevice,
                                         sibling_node);
        }

        return 0;
}

int device_find_next_child(struct udevice **devp)
{
        struct udevice *dev = *devp;
        struct udevice *parent = dev->parent;

        if (list_is_last(&dev->sibling_node, &parent->child_head)) {
                *devp = NULL;
        } else {
                *devp = list_entry(dev->sibling_node.next, struct udevice,
                                   sibling_node);
        }

        return 0;
}

int device_find_first_inactive_child(const struct udevice *parent,
                                     enum uclass_id uclass_id,
                                     struct udevice **devp)
{
        struct udevice *dev;

        *devp = NULL;
        list_for_each_entry(dev, &parent->child_head, sibling_node) {
                if (!device_active(dev) &&
                    device_get_uclass_id(dev) == uclass_id) {
                        *devp = dev;
                        return 0;
                }
        }

        return -ENODEV;
}

int device_find_first_child_by_uclass(const struct udevice *parent,
                                      enum uclass_id uclass_id,
                                      struct udevice **devp)
{
        struct udevice *dev;

        *devp = NULL;
        list_for_each_entry(dev, &parent->child_head, sibling_node) {
                if (device_get_uclass_id(dev) == uclass_id) {
                        *devp = dev;
                        return 0;
                }
        }

        return -ENODEV;
}

int device_find_child_by_name(const struct udevice *parent, const char *name,
                              struct udevice **devp)
{
        struct udevice *dev;

        *devp = NULL;

        list_for_each_entry(dev, &parent->child_head, sibling_node) {
                if (!strcmp(dev->name, name)) {
                        *devp = dev;
                        return 0;
                }
        }

        return -ENODEV;
}

int device_first_child_err(struct udevice *parent, struct udevice **devp)
{
        struct udevice *dev;

        device_find_first_child(parent, &dev);
        if (!dev)
                return -ENODEV;

        return device_get_device_tail(dev, 0, devp);
}

int device_next_child_err(struct udevice **devp)
{
        struct udevice *dev = *devp;

        device_find_next_child(&dev);
        if (!dev)
                return -ENODEV;

        return device_get_device_tail(dev, 0, devp);
}

int device_first_child_ofdata_err(struct udevice *parent, struct udevice **devp)
{
        struct udevice *dev;
        int ret;

        device_find_first_child(parent, &dev);
        if (!dev)
                return -ENODEV;

        ret = device_of_to_plat(dev);
        if (ret)
                return ret;

        *devp = dev;

        return 0;
}

int device_next_child_ofdata_err(struct udevice **devp)
{
        struct udevice *dev = *devp;
        int ret;

        device_find_next_child(&dev);
        if (!dev)
                return -ENODEV;

        ret = device_of_to_plat(dev);
        if (ret)
                return ret;

        *devp = dev;

        return 0;
}

struct udevice *dev_get_parent(const struct udevice *child)
{
        return child->parent;
}

ulong dev_get_driver_data(const struct udevice *dev)
{
        return dev->driver_data;
}

const void *dev_get_driver_ops(const struct udevice *dev)
{
        if (!dev || !dev->driver->ops)
                return NULL;

        return dev->driver->ops;
}

enum uclass_id device_get_uclass_id(const struct udevice *dev)
{
        return dev->uclass->uc_drv->id;

}

const char *dev_get_uclass_name(const struct udevice *dev)
{
        if (!dev)
                return NULL;

        return dev->uclass->uc_drv->name;
}

bool device_has_children(const struct udevice *dev)
{
        return !list_empty(&dev->child_head);
}

bool device_has_active_children(const struct udevice *dev)
{
        struct udevice *child;

        for (device_find_first_child(dev, &child);
             child;
             device_find_next_child(&child)) {
                if (device_active(child))
                        return true;
        }

        return false;
}

bool device_is_last_sibling(const struct udevice *dev)
{
        struct udevice *parent = dev->parent;

        if (!parent)
                return false;
        return list_is_last(&dev->sibling_node, &parent->child_head);
}

void device_set_name_alloced(struct udevice *dev)
{
        dev_or_flags(dev, DM_FLAG_NAME_ALLOCED);
}

int device_set_name(struct udevice *dev, const char *name)
{
        name = strdup(name);
        if (!name)
                return -ENOMEM;
        dev->name = name;
        device_set_name_alloced(dev);

        return 0;
}

void dev_set_priv(struct udevice *dev, void *priv)
{
        dev->priv_ = priv;
}

void dev_set_parent_priv(struct udevice *dev, void *parent_priv)
{
        dev->parent_priv_ = parent_priv;
}

void dev_set_uclass_priv(struct udevice *dev, void *uclass_priv)
{
        dev->uclass_priv_ = uclass_priv;
}

void dev_set_plat(struct udevice *dev, void *plat)
{
        dev->plat_ = plat;
}

void dev_set_parent_plat(struct udevice *dev, void *parent_plat)
{
        dev->parent_plat_ = parent_plat;
}

void dev_set_uclass_plat(struct udevice *dev, void *uclass_plat)
{
        dev->uclass_plat_ = uclass_plat;
}

#if CONFIG_IS_ENABLED(OF_REAL)
bool device_is_compatible(const struct udevice *dev, const char *compat)
{
        return ofnode_device_is_compatible(dev_ofnode(dev), compat);
}

bool of_machine_is_compatible(const char *compat)
{
        const void *fdt = gd->fdt_blob;

        return !fdt_node_check_compatible(fdt, 0, compat);
}

int dev_disable_by_path(const char *path)
{
        struct uclass *uc;
        ofnode node = ofnode_path(path);
        struct udevice *dev;
        int ret = 1;

        if (!of_live_active())
                return -ENOSYS;

        list_for_each_entry(uc, gd->uclass_root, sibling_node) {
                ret = uclass_find_device_by_ofnode(uc->uc_drv->id, node, &dev);
                if (!ret)
                        break;
        }

        if (ret)
                return ret;

        ret = device_remove(dev, DM_REMOVE_NORMAL);
        if (ret)
                return ret;

        ret = device_unbind(dev);
        if (ret)
                return ret;

        return ofnode_set_enabled(node, false);
}

int dev_enable_by_path(const char *path)
{
        ofnode node = ofnode_path(path);
        ofnode pnode = ofnode_get_parent(node);
        struct udevice *parent;
        int ret = 1;

        if (!of_live_active())
                return -ENOSYS;

        ret = device_find_by_ofnode(pnode, &parent);
        if (ret)
                return ret;

        ret = ofnode_set_enabled(node, true);
        if (ret)
                return ret;

        return lists_bind_fdt(parent, node, NULL, NULL, false);
}
#endif

#if CONFIG_IS_ENABLED(OF_PLATDATA_RT)
static struct udevice_rt *dev_get_rt(const struct udevice *dev)
{
        struct udevice *base = ll_entry_start(struct udevice, udevice);
        int idx = dev - base;

        struct udevice_rt *urt = gd_dm_udevice_rt() + idx;

        return urt;
}

u32 dev_get_flags(const struct udevice *dev)
{
        const struct udevice_rt *urt = dev_get_rt(dev);

        return urt->flags_;
}

void dev_or_flags(const struct udevice *dev, u32 or)
{
        struct udevice_rt *urt = dev_get_rt(dev);

        urt->flags_ |= or;
}

void dev_bic_flags(const struct udevice *dev, u32 bic)
{
        struct udevice_rt *urt = dev_get_rt(dev);

        urt->flags_ &= ~bic;
}
#endif /* OF_PLATDATA_RT */