target/linux/bcm27xx/patches-5.4/950-0538-clk-bcm-Add-BCM2711-DVP-driver.patch

   1 From 0a2b9668e391b5fef4c54f992d7f8f99e5f50ef3 Mon Sep 17 00:00:00 2001
   2 From: Maxime Ripard <maxime@cerno.tech>
   3 Date: Tue, 28 Jan 2020 09:36:27 +0100
   4 Subject: [PATCH] clk: bcm: Add BCM2711 DVP driver
   5
   6 The HDMI block has a block that controls clocks and reset signals to the
   7 HDMI0 and HDMI1 controllers.
   8
   9 Let's expose that through a clock driver implementing a clock and reset
  10 provider.
  11
  12 Cc: Michael Turquette <mturquette@baylibre.com>
  13 Cc: Stephen Boyd <sboyd@kernel.org>
  14 Cc: Rob Herring <robh+dt@kernel.org>
  15 Cc: linux-clk@vger.kernel.org
  16 Cc: devicetree@vger.kernel.org
  17 Signed-off-by: Maxime Ripard <maxime@cerno.tech>
  18 ---
  19  drivers/clk/bcm/Kconfig           |   1 +
  20  drivers/clk/bcm/Makefile          |   1 +
  21  drivers/clk/bcm/clk-bcm2711-dvp.c | 125 ++++++++++++++++++++++++++++++
  22  3 files changed, 127 insertions(+)
  23  create mode 100644 drivers/clk/bcm/clk-bcm2711-dvp.c
  24
  25 --- a/drivers/clk/bcm/Kconfig
  26 +++ b/drivers/clk/bcm/Kconfig
  27 @@ -4,6 +4,7 @@ config CLK_BCM2835
  28         depends on ARCH_BCM2835 || ARCH_BRCMSTB || COMPILE_TEST
  29         depends on COMMON_CLK
  30         default ARCH_BCM2835 || ARCH_BRCMSTB
  31 +       select RESET_SIMPLE
  32         help
  33           Enable common clock framework support for Broadcom BCM2835
  34           SoCs.
  35 --- a/drivers/clk/bcm/Makefile
  36 +++ b/drivers/clk/bcm/Makefile
  37 @@ -6,6 +6,7 @@ obj-$(CONFIG_CLK_BCM_KONA)      += clk-kona-s
  38  obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm281xx.o
  39  obj-$(CONFIG_CLK_BCM_KONA)     += clk-bcm21664.o
  40  obj-$(CONFIG_COMMON_CLK_IPROC) += clk-iproc-armpll.o clk-iproc-pll.o clk-iproc-asiu.o
  41 +obj-$(CONFIG_CLK_BCM2835)      += clk-bcm2711-dvp.o
  42  obj-$(CONFIG_CLK_BCM2835)      += clk-bcm2835.o
  43  obj-$(CONFIG_CLK_BCM2835)      += clk-bcm2835-aux.o
  44  obj-$(CONFIG_CLK_RASPBERRYPI)  += clk-raspberrypi.o
  45 --- /dev/null
  46 +++ b/drivers/clk/bcm/clk-bcm2711-dvp.c
  47 @@ -0,0 +1,125 @@
  48 +// SPDX-License-Identifier: GPL-2.0-or-later
  49 +// Copyright 2020 Cerno
  50 +
  51 +#include <linux/clk-provider.h>
  52 +#include <linux/module.h>
  53 +#include <linux/platform_device.h>
  54 +#include <linux/reset-controller.h>
  55 +#include <linux/reset/reset-simple.h>
  56 +
  57 +#define DVP_HT_RPI_SW_INIT     0x04
  58 +#define DVP_HT_RPI_MISC_CONFIG 0x08
  59 +
  60 +#define NR_CLOCKS      2
  61 +#define NR_RESETS      6
  62 +
  63 +struct clk_dvp {
  64 +       struct clk_hw_onecell_data      *data;
  65 +       struct reset_simple_data        reset;
  66 +};
  67 +
  68 +static int clk_dvp_probe(struct platform_device *pdev)
  69 +{
  70 +       struct clk_hw_onecell_data *data;
  71 +       struct resource *res;
  72 +       struct clk_dvp *dvp;
  73 +       void __iomem *base;
  74 +       const char *parent;
  75 +       int ret;
  76 +
  77 +       dvp = devm_kzalloc(&pdev->dev, sizeof(*dvp), GFP_KERNEL);
  78 +       if (!dvp)
  79 +               return -ENOMEM;
  80 +       platform_set_drvdata(pdev, dvp);
  81 +
  82 +       dvp->data = devm_kzalloc(&pdev->dev,
  83 +                                struct_size(dvp->data, hws, NR_CLOCKS),
  84 +                                GFP_KERNEL);
  85 +       if (!dvp->data)
  86 +               return -ENOMEM;
  87 +       data = dvp->data;
  88 +
  89 +       res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
  90 +       base = devm_ioremap_resource(&pdev->dev, res);
  91 +       if (IS_ERR(base))
  92 +               return PTR_ERR(base);
  93 +
  94 +       dvp->reset.rcdev.owner = THIS_MODULE;
  95 +       dvp->reset.rcdev.nr_resets = NR_RESETS;
  96 +       dvp->reset.rcdev.ops = &reset_simple_ops;
  97 +       dvp->reset.rcdev.of_node = pdev->dev.of_node;
  98 +       dvp->reset.membase = base + DVP_HT_RPI_SW_INIT;
  99 +       spin_lock_init(&dvp->reset.lock);
 100 +
 101 +       ret = reset_controller_register(&dvp->reset.rcdev);
 102 +       if (ret)
 103 +               return ret;
 104 +
 105 +       parent = of_clk_get_parent_name(pdev->dev.of_node, 0);
 106 +       if (!parent)
 107 +               goto unregister_reset;
 108 +
 109 +       data->hws[0] = clk_hw_register_gate(&pdev->dev, "hdmi0-108MHz",
 110 +                                           parent, 0,
 111 +                                           base + DVP_HT_RPI_MISC_CONFIG, 3,
 112 +                                           CLK_GATE_SET_TO_DISABLE, &dvp->reset.lock);
 113 +       if (IS_ERR(data->hws[0])) {
 114 +               ret = PTR_ERR(data->hws[0]);
 115 +               goto unregister_reset;
 116 +       }
 117 +
 118 +       data->hws[1] = clk_hw_register_gate(&pdev->dev, "hdmi1-108MHz",
 119 +                                           parent, 0,
 120 +                                           base + DVP_HT_RPI_MISC_CONFIG, 4,
 121 +                                           CLK_GATE_SET_TO_DISABLE, &dvp->reset.lock);
 122 +       if (IS_ERR(data->hws[1])) {
 123 +               ret = PTR_ERR(data->hws[1]);
 124 +               goto unregister_clk0;
 125 +       }
 126 +
 127 +       data->num = NR_CLOCKS;
 128 +       ret = of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
 129 +                                    data);
 130 +       if (ret)
 131 +               goto unregister_clk1;
 132 +
 133 +       return 0;
 134 +
 135 +
 136 +unregister_clk1:
 137 +       clk_hw_unregister_gate(data->hws[1]);
 138 +
 139 +unregister_clk0:
 140 +       clk_hw_unregister_gate(data->hws[0]);
 141 +
 142 +unregister_reset:
 143 +       reset_controller_unregister(&dvp->reset.rcdev);
 144 +       return ret;
 145 +};
 146 +
 147 +static int clk_dvp_remove(struct platform_device *pdev)
 148 +{
 149 +       struct clk_dvp *dvp = platform_get_drvdata(pdev);
 150 +       struct clk_hw_onecell_data *data = dvp->data;
 151 +
 152 +       clk_hw_unregister_gate(data->hws[1]);
 153 +       clk_hw_unregister_gate(data->hws[0]);
 154 +       reset_controller_unregister(&dvp->reset.rcdev);
 155 +
 156 +       return 0;
 157 +}
 158 +
 159 +static const struct of_device_id clk_dvp_dt_ids[] = {
 160 +       { .compatible = "brcm,brcm2711-dvp", },
 161 +       { /* sentinel */ }
 162 +};
 163 +
 164 +static struct platform_driver clk_dvp_driver = {
 165 +       .probe  = clk_dvp_probe,
 166 +       .remove = clk_dvp_remove,
 167 +       .driver = {
 168 +               .name           = "brcm2711-dvp",
 169 +               .of_match_table = clk_dvp_dt_ids,
 170 +       },
 171 +};
 172 +module_platform_driver(clk_dvp_driver);