Quelle  clk-bcm2711-dvp.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
// Copyright 2020 Cerno

#include <linux/clk-provider.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
#include <linux/reset/reset-simple.h>

#define DVP_HT_RPI_SW_INIT 0x04
#define DVP_HT_RPI_MISC_CONFIG 0x08

#define NR_CLOCKS 2
#define NR_RESETS 6

struct clk_dvp {
 struct clk_hw_onecell_data *data;
 struct reset_simple_data reset;
};

static const struct clk_parent_data clk_dvp_parent = {
 .index = 0,
};

static int clk_dvp_probe(struct platform_device *pdev)
{
 struct clk_hw_onecell_data *data;
 struct clk_dvp *dvp;
 void __iomem *base;
 int ret;

 dvp = devm_kzalloc(&pdev->dev, sizeof(*dvp), GFP_KERNEL);
 if (!dvp)
  return -ENOMEM;
 platform_set_drvdata(pdev, dvp);

 dvp->data = devm_kzalloc(&pdev->dev,
     struct_size(dvp->data, hws, NR_CLOCKS),
     GFP_KERNEL);
 if (!dvp->data)
  return -ENOMEM;
 data = dvp->data;

 base = devm_platform_ioremap_resource(pdev, 0);
 if (IS_ERR(base))
  return PTR_ERR(base);

 dvp->reset.rcdev.owner = THIS_MODULE;
 dvp->reset.rcdev.nr_resets = NR_RESETS;
 dvp->reset.rcdev.ops = &reset_simple_ops;
 dvp->reset.rcdev.of_node = pdev->dev.of_node;
 dvp->reset.membase = base + DVP_HT_RPI_SW_INIT;
 spin_lock_init(&dvp->reset.lock);

 ret = devm_reset_controller_register(&pdev->dev, &dvp->reset.rcdev);
 if (ret)
  return ret;

 data->num = NR_CLOCKS;

 data->hws[0] = clk_hw_register_gate_parent_data(&pdev->dev,
       "hdmi0-108MHz",
       &clk_dvp_parent, 0,
       base + DVP_HT_RPI_MISC_CONFIG, 3,
       CLK_GATE_SET_TO_DISABLE,
       &dvp->reset.lock);
 if (IS_ERR(data->hws[0]))
  return PTR_ERR(data->hws[0]);

 data->hws[1] = clk_hw_register_gate_parent_data(&pdev->dev,
       "hdmi1-108MHz",
       &clk_dvp_parent, 0,
       base + DVP_HT_RPI_MISC_CONFIG, 4,
       CLK_GATE_SET_TO_DISABLE,
       &dvp->reset.lock);
 if (IS_ERR(data->hws[1])) {
  ret = PTR_ERR(data->hws[1]);
  goto unregister_clk0;
 }

 ret = of_clk_add_hw_provider(pdev->dev.of_node, of_clk_hw_onecell_get,
         data);
 if (ret)
  goto unregister_clk1;

 return 0;

unregister_clk1:
 clk_hw_unregister_gate(data->hws[1]);

unregister_clk0:
 clk_hw_unregister_gate(data->hws[0]);
 return ret;
};

static void clk_dvp_remove(struct platform_device *pdev)
{
 struct clk_dvp *dvp = platform_get_drvdata(pdev);
 struct clk_hw_onecell_data *data = dvp->data;

 clk_hw_unregister_gate(data->hws[1]);
 clk_hw_unregister_gate(data->hws[0]);
}

static const struct of_device_id clk_dvp_dt_ids[] = {
 { .compatible = "brcm,brcm2711-dvp", },
 { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, clk_dvp_dt_ids);

static struct platform_driver clk_dvp_driver = {
 .probe = clk_dvp_probe,
 .remove = clk_dvp_remove,
 .driver = {
  .name  = "brcm2711-dvp",
  .of_match_table = clk_dvp_dt_ids,
 },
};
module_platform_driver(clk_dvp_driver);

MODULE_AUTHOR("Maxime Ripard ");
MODULE_DESCRIPTION("BCM2711 DVP clock driver");
MODULE_LICENSE("GPL");