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
  16 struct clk_dvp {
  17         struct clk_hw_onecell_data      *data;
  18         struct reset_simple_data        reset;
  19 };
  20
  21 static const struct clk_parent_data clk_dvp_parent = {
  22         .index  = 0,
  23 };
  24
  25 static 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
  88 unregister_clk1:
  89         clk_hw_unregister_gate(data->hws[1]);
  90
  91 unregister_clk0:
  92         clk_hw_unregister_gate(data->hws[0]);
  93         return ret;
  94 };
  95
  96 static 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
 107 static const struct of_device_id clk_dvp_dt_ids[] = {
 108         { .compatible = "brcm,brcm2711-dvp", },
 109         { /* sentinel */ }
 110 };
 111 MODULE_DEVICE_TABLE(of, clk_dvp_dt_ids);
 112
 113 static struct platform_driver clk_dvp_driver = {
 114         .probe  = clk_dvp_probe,
 115         .remove = clk_dvp_remove,
 116         .driver = {
 117                 .name           = "brcm2711-dvp",
 118                 .of_match_table = clk_dvp_dt_ids,
 119         },
 120 };
 121 module_platform_driver(clk_dvp_driver);
 122
 123 MODULE_AUTHOR("Maxime Ripard <maxime@cerno.tech>");
 124 MODULE_DESCRIPTION("BCM2711 DVP clock driver");
 125 MODULE_LICENSE("GPL");