clk: RK808: add clkout driver for RK808 (038b892a) · Commits · 戴 / test

drivers/clk/Kconfig

+9 −0

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		@@ -38,6 +38,15 @@ config COMMON_CLK_MAX77686
		---help---
		This driver supports Maxim 77686 crystal oscillator clock.

		config COMMON_CLK_RK808
		tristate "Clock driver for RK808"
		depends on MFD_RK808
		---help---
		This driver supports RK808 crystal oscillator clock. These
		multi-function devices have two fixed-rate oscillators,
		clocked at 32KHz each. Clkout1 is always on, Clkout2 can off
		by control register.

		config COMMON_CLK_SI5351
		tristate "Clock driver for SiLabs 5351A/B/C"
		depends on I2C

drivers/clk/Makefile

+1 −0

Original line number	Diff line number	Diff line
		@@ -28,6 +28,7 @@ obj-$(CONFIG_ARCH_NOMADIK) += clk-nomadik.o
		obj-$(CONFIG_ARCH_NSPIRE) += clk-nspire.o
		obj-$(CONFIG_COMMON_CLK_PALMAS) += clk-palmas.o
		obj-$(CONFIG_CLK_PPC_CORENET) += clk-ppc-corenet.o
		obj-$(CONFIG_COMMON_CLK_RK808) += clk-rk808.o
		obj-$(CONFIG_COMMON_CLK_S2MPS11) += clk-s2mps11.o
		obj-$(CONFIG_COMMON_CLK_SI5351) += clk-si5351.o
		obj-$(CONFIG_COMMON_CLK_SI570) += clk-si570.o

drivers/clk/clk-rk808.c

0 → 100644

+170 −0

Original line number	Diff line number	Diff line
		/*
		* Clkout driver for Rockchip RK808
		*
		* Copyright (c) 2014, Fuzhou Rockchip Electronics Co., Ltd
		*
		* Author:Chris Zhong <zyw@rock-chips.com>
		*
		* This program is free software; you can redistribute it and/or modify it
		* under the terms and conditions of the GNU General Public License,
		* version 2, as published by the Free Software Foundation.
		*
		* This program is distributed in the hope it will be useful, but WITHOUT
		* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
		* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
		* more details.
		*/

		#include <linux/clk.h>
		#include <linux/clk-provider.h>
		#include <linux/module.h>
		#include <linux/slab.h>
		#include <linux/platform_device.h>
		#include <linux/mfd/rk808.h>
		#include <linux/i2c.h>

		#define RK808_NR_OUTPUT 2

		struct rk808_clkout {
		struct rk808 *rk808;
		struct clk_onecell_data clk_data;
		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);
		struct rk808 *rk808 = rk808_clkout->rk808;

		return regmap_update_bits(rk808->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);
		struct rk808 *rk808 = rk808_clkout->rk808;
		uint32_t val;

		int ret = regmap_read(rk808->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 int rk808_clkout_probe(struct platform_device *pdev)
		{
		struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
		struct i2c_client *client = rk808->i2c;
		struct device_node *node = client->dev.of_node;
		struct clk_init_data init = {};
		struct clk **clk_table;
		struct rk808_clkout *rk808_clkout;

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

		rk808_clkout->rk808 = rk808;

		clk_table = devm_kcalloc(&client->dev, RK808_NR_OUTPUT,
		sizeof(struct clk *), GFP_KERNEL);
		if (!clk_table)
		return -ENOMEM;

		init.flags = CLK_IS_ROOT;
		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(node, "clock-output-names",
		0, &init.name);

		clk_table[0] = devm_clk_register(&client->dev,
		&rk808_clkout->clkout1_hw);
		if (IS_ERR(clk_table[0]))
		return PTR_ERR(clk_table[0]);

		init.name = "rk808-clkout2";
		init.ops = &rk808_clkout2_ops;
		rk808_clkout->clkout2_hw.init = &init;

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

		clk_table[1] = devm_clk_register(&client->dev,
		&rk808_clkout->clkout2_hw);
		if (IS_ERR(clk_table[1]))
		return PTR_ERR(clk_table[1]);

		rk808_clkout->clk_data.clks = clk_table;
		rk808_clkout->clk_data.clk_num = RK808_NR_OUTPUT;

		return of_clk_add_provider(node, of_clk_src_onecell_get,
		&rk808_clkout->clk_data);
		}

		static int rk808_clkout_remove(struct platform_device *pdev)
		{
		struct rk808 *rk808 = dev_get_drvdata(pdev->dev.parent);
		struct i2c_client *client = rk808->i2c;
		struct device_node *node = client->dev.of_node;

		of_clk_del_provider(node);

		return 0;
		}

		static struct platform_driver rk808_clkout_driver = {
		.probe = rk808_clkout_probe,
		.remove = rk808_clkout_remove,
		.driver = {
		.name = "rk808-clkout",
		},
		};

		module_platform_driver(rk808_clkout_driver);

		MODULE_DESCRIPTION("Clkout driver for the rk808 series PMICs");
		MODULE_AUTHOR("Chris Zhong <zyw@rock-chips.com>");
		MODULE_LICENSE("GPL");
		MODULE_ALIAS("platform:rk808-clkout");

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