mirror of https://gitee.com/openkylin/linux.git
150 lines
3.6 KiB
C
150 lines
3.6 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Clkout driver for Rockchip RK808
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*
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* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
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*
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* Author:Chris Zhong <zyw@rock-chips.com>
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*/
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#include <linux/clk-provider.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/platform_device.h>
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#include <linux/mfd/rk808.h>
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#include <linux/i2c.h>
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struct rk808_clkout {
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struct rk808 *rk808;
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struct clk_hw clkout1_hw;
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struct clk_hw clkout2_hw;
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};
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static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
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unsigned long parent_rate)
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{
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return 32768;
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}
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static int rk808_clkout2_enable(struct clk_hw *hw, bool enable)
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{
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struct rk808_clkout *rk808_clkout = container_of(hw,
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struct rk808_clkout,
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clkout2_hw);
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struct rk808 *rk808 = rk808_clkout->rk808;
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return regmap_update_bits(rk808->regmap, RK808_CLK32OUT_REG,
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CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
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}
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static int rk808_clkout2_prepare(struct clk_hw *hw)
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{
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return rk808_clkout2_enable(hw, true);
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}
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static void rk808_clkout2_unprepare(struct clk_hw *hw)
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{
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rk808_clkout2_enable(hw, false);
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}
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static int rk808_clkout2_is_prepared(struct clk_hw *hw)
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{
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struct rk808_clkout *rk808_clkout = container_of(hw,
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struct rk808_clkout,
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clkout2_hw);
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struct rk808 *rk808 = rk808_clkout->rk808;
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uint32_t val;
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int ret = regmap_read(rk808->regmap, RK808_CLK32OUT_REG, &val);
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if (ret < 0)
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return ret;
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return (val & CLK32KOUT2_EN) ? 1 : 0;
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}
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static const struct clk_ops rk808_clkout1_ops = {
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.recalc_rate = rk808_clkout_recalc_rate,
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};
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static const struct clk_ops rk808_clkout2_ops = {
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.prepare = rk808_clkout2_prepare,
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.unprepare = rk808_clkout2_unprepare,
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.is_prepared = rk808_clkout2_is_prepared,
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.recalc_rate = rk808_clkout_recalc_rate,
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};
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static struct clk_hw *
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of_clk_rk808_get(struct of_phandle_args *clkspec, void *data)
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{
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struct rk808_clkout *rk808_clkout = data;
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unsigned int idx = clkspec->args[0];
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if (idx >= 2) {
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pr_err("%s: invalid index %u\n", __func__, idx);
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return ERR_PTR(-EINVAL);
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}
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return idx ? &rk808_clkout->clkout2_hw : &rk808_clkout->clkout1_hw;
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}
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static int rk808_clkout_probe(struct platform_device *pdev)
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{
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struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
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struct i2c_client *client = rk808->i2c;
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struct device_node *node = client->dev.of_node;
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struct clk_init_data init = {};
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struct rk808_clkout *rk808_clkout;
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int ret;
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rk808_clkout = devm_kzalloc(&client->dev,
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sizeof(*rk808_clkout), GFP_KERNEL);
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if (!rk808_clkout)
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return -ENOMEM;
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rk808_clkout->rk808 = rk808;
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init.parent_names = NULL;
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init.num_parents = 0;
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init.name = "rk808-clkout1";
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init.ops = &rk808_clkout1_ops;
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rk808_clkout->clkout1_hw.init = &init;
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/* optional override of the clockname */
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of_property_read_string_index(node, "clock-output-names",
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0, &init.name);
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ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout1_hw);
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if (ret)
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return ret;
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init.name = "rk808-clkout2";
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init.ops = &rk808_clkout2_ops;
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rk808_clkout->clkout2_hw.init = &init;
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/* optional override of the clockname */
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of_property_read_string_index(node, "clock-output-names",
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1, &init.name);
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ret = devm_clk_hw_register(&client->dev, &rk808_clkout->clkout2_hw);
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if (ret)
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return ret;
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return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_rk808_get,
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rk808_clkout);
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}
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static struct platform_driver rk808_clkout_driver = {
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.probe = rk808_clkout_probe,
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.driver = {
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.name = "rk808-clkout",
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},
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};
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module_platform_driver(rk808_clkout_driver);
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MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
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MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS("platform:rk808-clkout");
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