LXR linux/drivers/clk/bcm/clk-bcm2711-dvp.c

   1// SPDX-License-Identifier: GPL-2.0-or-later
   2// Copyright 2020 Cerno
   3
   4#include <linux/clk-provider.h>
   5#include <linux/module.h>
   6#include <linux/platform_device.h>
   7#include <linux/reset-controller.h>
   8#include <linux/reset/reset-simple.h>
   9
  10#define DVP_HT_RPI_SW_INIT      0x04
  11#define DVP_HT_RPI_MISC_CONFIG  0x08
  12
  13#define NR_CLOCKS       2
  14#define NR_RESETS       6
  15
  16struct clk_dvp {
  17        struct clk_hw_onecell_data      *data;
  18        struct reset_simple_data        reset;
  19};
  20
  21static const struct clk_parent_data clk_dvp_parent = {
  22        .index  = 0,
  23};
  24
  25static int clk_dvp_probe(struct platform_device *pdev)
  26{
  27        struct clk_hw_onecell_data *data;
  28        struct resource *res;
  29        struct clk_dvp *dvp;
  30        void __iomem *base;
  31        int ret;
  32
  33        dvp = devm_kzalloc(&pdev->dev, sizeof(*dvp), GFP_KERNEL);
  34        if (!dvp)
  35                return -ENOMEM;
  36        platform_set_drvdata(pdev, dvp);
  37
  38        dvp->data = devm_kzalloc(&pdev->dev,
  39                                 struct_size(dvp->data, hws, NR_CLOCKS),
  40                                 GFP_KERNEL);
  41        if (!dvp->data)
  42                return -ENOMEM;
  43        data = dvp->data;
  44
  45        base = devm_platform_get_and_ioremap_resource(pdev, 0, &res);
  46        if (IS_ERR(base))
  47                return PTR_ERR(base);
  48
  49        dvp->reset.rcdev.owner = THIS_MODULE;
  50        dvp->reset.rcdev.nr_resets = NR_RESETS;
  51        dvp->reset.rcdev.ops = &reset_simple_ops;
  52        dvp->reset.rcdev.of_node = pdev->dev.of_node;
  53        dvp->reset.membase = base + DVP_HT_RPI_SW_INIT;
  54        spin_lock_init(&dvp->reset.lock);
  55
  56        ret = devm_reset_controller_register(&pdev->dev, &dvp->reset.rcdev);
  57        if (ret)
  58                return ret;
  59
  60        data->hws[0] = clk_hw_register_gate_parent_data(&pdev->dev,
  61                                                        "hdmi0-108MHz",
  62                                                        &clk_dvp_parent, 0,
  63                                                        base + DVP_HT_RPI_MISC_CONFIG, 3,
  64                                                        CLK_GATE_SET_TO_DISABLE,
  65                                                        &dvp->reset.lock);
  66        if (IS_ERR(data->hws[0]))
  67                return PTR_ERR(data->hws[0]);
  68
  69        data->hws[1] = clk_hw_register_gate_parent_data(&pdev->dev,
  70                                                        "hdmi1-108MHz",
  71                                                        &clk_dvp_parent, 0,
  72                                                        base + DVP_HT_RPI_MISC_CONFIG, 4,
  73                                                        CLK_GATE_SET_TO_DISABLE,
  74                                                        &dvp->reset.lock);
  75        if (IS_ERR(data->hws[1])) {
  76                ret = PTR_ERR(data->hws[1]);
  77                goto unregister_clk0;
  78        }
  79
  80        data->num = NR_CLOCKS;
  81        ret = of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
  82                                     data);
  83        if (ret)
  84                goto unregister_clk1;
  85
  86        return 0;
  87
  88unregister_clk1:
  89        clk_hw_unregister_gate(data->hws[1]);
  90
  91unregister_clk0:
  92        clk_hw_unregister_gate(data->hws[0]);
  93        return ret;
  94};
  95
  96static int clk_dvp_remove(struct platform_device *pdev)
  97{
  98        struct clk_dvp *dvp = platform_get_drvdata(pdev);
  99        struct clk_hw_onecell_data *data = dvp->data;
 100
 101        clk_hw_unregister_gate(data->hws[1]);
 102        clk_hw_unregister_gate(data->hws[0]);
 103
 104        return 0;
 105}
 106
 107static const struct of_device_id clk_dvp_dt_ids[] = {
 108        { .compatible = "brcm,brcm2711-dvp", },
 109        { /* sentinel */ }
 110};
 111
 112static struct platform_driver clk_dvp_driver = {
 113        .probe  = clk_dvp_probe,
 114        .remove = clk_dvp_remove,
 115        .driver = {
 116                .name           = "brcm2711-dvp",
 117                .of_match_table = clk_dvp_dt_ids,
 118        },
 119};
 120module_platform_driver(clk_dvp_driver);
 121
 122MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>");
 123MODULE_DESCRIPTION("BCM2711 DVP clock driver");
 124MODULE_LICENSE("GPL");
 125