linux/drivers/clk/bcm/clk-bcm2711-dvp.c
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   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 clk_dvp *dvp;
  29        void __iomem *base;
  30        int ret;
  31
  32        dvp = devm_kzalloc(&pdev->dev, sizeof(*dvp), GFP_KERNEL);
  33        if (!dvp)
  34                return -ENOMEM;
  35        platform_set_drvdata(pdev, dvp);
  36
  37        dvp->data = devm_kzalloc(&pdev->dev,
  38                                 struct_size(dvp->data, hws, NR_CLOCKS),
  39                                 GFP_KERNEL);
  40        if (!dvp->data)
  41                return -ENOMEM;
  42        data = dvp->data;
  43
  44        base = devm_platform_ioremap_resource(pdev, 0);
  45        if (IS_ERR(base))
  46                return PTR_ERR(base);
  47
  48        dvp->reset.rcdev.owner = THIS_MODULE;
  49        dvp->reset.rcdev.nr_resets = NR_RESETS;
  50        dvp->reset.rcdev.ops = &reset_simple_ops;
  51        dvp->reset.rcdev.of_node = pdev->dev.of_node;
  52        dvp->reset.membase = base + DVP_HT_RPI_SW_INIT;
  53        spin_lock_init(&dvp->reset.lock);
  54
  55        ret = devm_reset_controller_register(&pdev->dev, &dvp->reset.rcdev);
  56        if (ret)
  57                return ret;
  58
  59        data->hws[0] = clk_hw_register_gate_parent_data(&pdev->dev,
  60                                                        "hdmi0-108MHz",
  61                                                        &clk_dvp_parent, 0,
  62                                                        base + DVP_HT_RPI_MISC_CONFIG, 3,
  63                                                        CLK_GATE_SET_TO_DISABLE,
  64                                                        &dvp->reset.lock);
  65        if (IS_ERR(data->hws[0]))
  66                return PTR_ERR(data->hws[0]);
  67
  68        data->hws[1] = clk_hw_register_gate_parent_data(&pdev->dev,
  69                                                        "hdmi1-108MHz",
  70                                                        &clk_dvp_parent, 0,
  71                                                        base + DVP_HT_RPI_MISC_CONFIG, 4,
  72                                                        CLK_GATE_SET_TO_DISABLE,
  73                                                        &dvp->reset.lock);
  74        if (IS_ERR(data->hws[1])) {
  75                ret = PTR_ERR(data->hws[1]);
  76                goto unregister_clk0;
  77        }
  78
  79        data->num = NR_CLOCKS;
  80        ret = of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
  81                                     data);
  82        if (ret)
  83                goto unregister_clk1;
  84
  85        return 0;
  86
  87unregister_clk1:
  88        clk_hw_unregister_gate(data->hws[1]);
  89
  90unregister_clk0:
  91        clk_hw_unregister_gate(data->hws[0]);
  92        return ret;
  93};
  94
  95static int clk_dvp_remove(struct platform_device *pdev)
  96{
  97        struct clk_dvp *dvp = platform_get_drvdata(pdev);
  98        struct clk_hw_onecell_data *data = dvp->data;
  99
 100        clk_hw_unregister_gate(data->hws[1]);
 101        clk_hw_unregister_gate(data->hws[0]);
 102
 103        return 0;
 104}
 105
 106static const struct of_device_id clk_dvp_dt_ids[] = {
 107        { .compatible = "brcm,brcm2711-dvp", },
 108        { /* sentinel */ }
 109};
 110MODULE_DEVICE_TABLE(of, clk_dvp_dt_ids);
 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
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