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// 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->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;
}
data->num = NR_CLOCKS;
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 int 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]);
return 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 <maxime@cerno.tech>");
MODULE_DESCRIPTION("BCM2711 DVP clock driver");
MODULE_LICENSE("GPL");
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