mirror of https://gitee.com/openkylin/linux.git
121 lines
2.9 KiB
C
121 lines
2.9 KiB
C
/*
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* Copyright (C) 2016 Free Electrons
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*
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* Maxime Ripard <maxime.ripard@free-electrons.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*/
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#include <linux/clk.h>
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#include <linux/component.h>
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#include <linux/module.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/reset.h>
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struct sun6i_drc {
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struct clk *bus_clk;
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struct clk *mod_clk;
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struct reset_control *reset;
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};
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static int sun6i_drc_bind(struct device *dev, struct device *master,
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void *data)
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{
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struct sun6i_drc *drc;
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int ret;
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drc = devm_kzalloc(dev, sizeof(*drc), GFP_KERNEL);
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if (!drc)
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return -ENOMEM;
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dev_set_drvdata(dev, drc);
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drc->reset = devm_reset_control_get(dev, NULL);
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if (IS_ERR(drc->reset)) {
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dev_err(dev, "Couldn't get our reset line\n");
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return PTR_ERR(drc->reset);
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}
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ret = reset_control_deassert(drc->reset);
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if (ret) {
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dev_err(dev, "Couldn't deassert our reset line\n");
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return ret;
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}
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drc->bus_clk = devm_clk_get(dev, "ahb");
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if (IS_ERR(drc->bus_clk)) {
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dev_err(dev, "Couldn't get our bus clock\n");
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ret = PTR_ERR(drc->bus_clk);
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goto err_assert_reset;
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}
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clk_prepare_enable(drc->bus_clk);
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drc->mod_clk = devm_clk_get(dev, "mod");
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if (IS_ERR(drc->mod_clk)) {
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dev_err(dev, "Couldn't get our mod clock\n");
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ret = PTR_ERR(drc->mod_clk);
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goto err_disable_bus_clk;
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}
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clk_prepare_enable(drc->mod_clk);
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return 0;
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err_disable_bus_clk:
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clk_disable_unprepare(drc->bus_clk);
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err_assert_reset:
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reset_control_assert(drc->reset);
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return ret;
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}
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static void sun6i_drc_unbind(struct device *dev, struct device *master,
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void *data)
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{
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struct sun6i_drc *drc = dev_get_drvdata(dev);
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clk_disable_unprepare(drc->mod_clk);
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clk_disable_unprepare(drc->bus_clk);
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reset_control_assert(drc->reset);
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}
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static const struct component_ops sun6i_drc_ops = {
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.bind = sun6i_drc_bind,
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.unbind = sun6i_drc_unbind,
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};
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static int sun6i_drc_probe(struct platform_device *pdev)
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{
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return component_add(&pdev->dev, &sun6i_drc_ops);
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}
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static int sun6i_drc_remove(struct platform_device *pdev)
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{
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component_del(&pdev->dev, &sun6i_drc_ops);
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return 0;
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}
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static const struct of_device_id sun6i_drc_of_table[] = {
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{ .compatible = "allwinner,sun6i-a31-drc" },
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{ .compatible = "allwinner,sun6i-a31s-drc" },
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{ .compatible = "allwinner,sun8i-a33-drc" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, sun6i_drc_of_table);
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static struct platform_driver sun6i_drc_platform_driver = {
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.probe = sun6i_drc_probe,
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.remove = sun6i_drc_remove,
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.driver = {
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.name = "sun6i-drc",
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.of_match_table = sun6i_drc_of_table,
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},
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};
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module_platform_driver(sun6i_drc_platform_driver);
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MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
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MODULE_DESCRIPTION("Allwinner A31 Dynamic Range Control (DRC) Driver");
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MODULE_LICENSE("GPL");
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