Quelle  clk-rk808.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Clkout driver for Rockchip RK808
 *
 * Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
 *
 * Author:Chris Zhong <zyw@rock-chips.com>
 */

#include <linux/clk-provider.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/mfd/rk808.h>

struct rk808_clkout {
 struct regmap  *regmap;
 struct clk_hw  clkout1_hw;
 struct clk_hw  clkout2_hw;
};

static unsigned long rk808_clkout_recalc_rate(struct clk_hw *hw,
           unsigned long parent_rate)
{
 return 32768;
}

static int rk808_clkout2_enable(struct clk_hw *hw, bool enable)
{
 struct rk808_clkout *rk808_clkout = container_of(hw,
        struct rk808_clkout,
        clkout2_hw);

 return regmap_update_bits(rk808_clkout->regmap, RK808_CLK32OUT_REG,
      CLK32KOUT2_EN, enable ? CLK32KOUT2_EN : 0);
}

static int rk808_clkout2_prepare(struct clk_hw *hw)
{
 return rk808_clkout2_enable(hw, true);
}

static void rk808_clkout2_unprepare(struct clk_hw *hw)
{
 rk808_clkout2_enable(hw, false);
}

static int rk808_clkout2_is_prepared(struct clk_hw *hw)
{
 struct rk808_clkout *rk808_clkout = container_of(hw,
        struct rk808_clkout,
        clkout2_hw);
 uint32_t val;

 int ret = regmap_read(rk808_clkout->regmap, RK808_CLK32OUT_REG, &val);

 if (ret < 0)
  return ret;

 return (val & CLK32KOUT2_EN) ? 1 : 0;
}

static const struct clk_ops rk808_clkout1_ops = {
 .recalc_rate = rk808_clkout_recalc_rate,
};

static const struct clk_ops rk808_clkout2_ops = {
 .prepare = rk808_clkout2_prepare,
 .unprepare = rk808_clkout2_unprepare,
 .is_prepared = rk808_clkout2_is_prepared,
 .recalc_rate = rk808_clkout_recalc_rate,
};

static struct clk_hw *
of_clk_rk808_get(struct of_phandle_args *clkspec, void *data)
{
 struct rk808_clkout *rk808_clkout = data;
 unsigned int idx = clkspec->args[0];

 if (idx >= 2) {
  pr_err("%s: invalid index %u\n", __func__, idx);
  return ERR_PTR(-EINVAL);
 }

 return idx ? &rk808_clkout->clkout2_hw : &rk808_clkout->clkout1_hw;
}

static int rk817_clkout2_enable(struct clk_hw *hw, bool enable)
{
 struct rk808_clkout *rk808_clkout = container_of(hw,
        struct rk808_clkout,
        clkout2_hw);

 return regmap_update_bits(rk808_clkout->regmap, RK817_SYS_CFG(1),
      RK817_CLK32KOUT2_EN,
      enable ? RK817_CLK32KOUT2_EN : 0);
}

static int rk817_clkout2_prepare(struct clk_hw *hw)
{
 return rk817_clkout2_enable(hw, true);
}

static void rk817_clkout2_unprepare(struct clk_hw *hw)
{
 rk817_clkout2_enable(hw, false);
}

static int rk817_clkout2_is_prepared(struct clk_hw *hw)
{
 struct rk808_clkout *rk808_clkout = container_of(hw,
        struct rk808_clkout,
        clkout2_hw);
 unsigned int val;

 int ret = regmap_read(rk808_clkout->regmap, RK817_SYS_CFG(1), &val);

 if (ret < 0)
  return 0;

 return (val & RK817_CLK32KOUT2_EN) ? 1 : 0;
}

static const struct clk_ops rk817_clkout2_ops = {
 .prepare = rk817_clkout2_prepare,
 .unprepare = rk817_clkout2_unprepare,
 .is_prepared = rk817_clkout2_is_prepared,
 .recalc_rate = rk808_clkout_recalc_rate,
};

static const struct clk_ops *rkpmic_get_ops(long variant)
{
 switch (variant) {
 case RK809_ID:
 case RK817_ID:
  return &rk817_clkout2_ops;
 /*
 * For the default case, it match the following PMIC type.
 * RK805_ID
 * RK808_ID
 * RK818_ID
 */
 default:
  return &rk808_clkout2_ops;
 }
}

static int rk808_clkout_probe(struct platform_device *pdev)
{
 struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
 struct device *dev = &pdev->dev;
 struct clk_init_data init = {};
 struct rk808_clkout *rk808_clkout;
 int ret;

 dev->of_node = pdev->dev.parent->of_node;

 rk808_clkout = devm_kzalloc(dev,
        sizeof(*rk808_clkout), GFP_KERNEL);
 if (!rk808_clkout)
  return -ENOMEM;

 rk808_clkout->regmap = dev_get_regmap(pdev->dev.parent, NULL);
 if (!rk808_clkout->regmap)
  return -ENODEV;

 init.parent_names = NULL;
 init.num_parents = 0;
 init.name = "rk808-clkout1";
 init.ops = &rk808_clkout1_ops;
 rk808_clkout->clkout1_hw.init = &init;

 /* optional override of the clockname */
 of_property_read_string_index(dev->of_node, "clock-output-names",
          0, &init.name);

 ret = devm_clk_hw_register(dev, &rk808_clkout->clkout1_hw);
 if (ret)
  return ret;

 init.name = "rk808-clkout2";
 init.ops = rkpmic_get_ops(rk808->variant);
 rk808_clkout->clkout2_hw.init = &init;

 /* optional override of the clockname */
 of_property_read_string_index(dev->of_node, "clock-output-names",
          1, &init.name);

 ret = devm_clk_hw_register(dev, &rk808_clkout->clkout2_hw);
 if (ret)
  return ret;

 return devm_of_clk_add_hw_provider(&pdev->dev, of_clk_rk808_get,
        rk808_clkout);
}

static struct platform_driver rk808_clkout_driver = {
 .probe = rk808_clkout_probe,
 .driver  = {
  .name = "rk808-clkout",
 },
};

module_platform_driver(rk808_clkout_driver);

MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
MODULE_AUTHOR("Chris Zhong ");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:rk808-clkout");