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Commit b68adc23 authored by Daniel Lezcano's avatar Daniel Lezcano Committed by Stephen Boyd
Browse files

clk: hi6220: Add the hi655x's pmic clock 



The hi655x multi function device is a PMIC providing regulators.

The PMIC also provides a clock for the WiFi and the Bluetooth, let's implement
this clock in order to add it in the hi655x MFD and allow proper wireless
initialization.

Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@linaro.org>
[sboyd@codeaurora.org: Remove clkdev usage]
Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
parent fc04f27d

drivers/clk/Kconfig

+8 −0
Original line number Diff line number Diff line
@@ -47,6 +47,14 @@ config COMMON_CLK_RK808 
	  clocked at 32KHz each. Clkout1 is always on, Clkout2 can off

	  by control register.



config COMMON_CLK_HI655X

	tristate "Clock driver for Hi655x"

	depends on MFD_HI655X_PMIC || COMPILE_TEST

	---help---

	  This driver supports the hi655x PMIC clock. This

	  multi-function device has one fixed-rate oscillator, clocked

	  at 32KHz.



config COMMON_CLK_SCPI

	tristate "Clock driver controlled via SCPI interface"

	depends on ARM_SCPI_PROTOCOL || COMPILE_TEST

drivers/clk/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -36,6 +36,7 @@ obj-$(CONFIG_COMMON_CLK_PALMAS) += clk-palmas.o 
obj-$(CONFIG_COMMON_CLK_PWM)		+= clk-pwm.o

obj-$(CONFIG_CLK_QORIQ)			+= clk-qoriq.o

obj-$(CONFIG_COMMON_CLK_RK808)		+= clk-rk808.o

obj-$(CONFIG_COMMON_CLK_HI655X)		+= clk-hi655x.o

obj-$(CONFIG_COMMON_CLK_S2MPS11)	+= clk-s2mps11.o

obj-$(CONFIG_COMMON_CLK_SCPI)           += clk-scpi.o

obj-$(CONFIG_COMMON_CLK_SI5351)		+= clk-si5351.o

drivers/clk/clk-hi655x.c

0 → 100644
+126 −0
Original line number Diff line number Diff line 
/*

 * Clock driver for Hi655x

 *

 * Copyright (c) 2017, Linaro Ltd.

 *

 * Author: Daniel Lezcano <daniel.lezcano@linaro.org>

 *

 * 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-provider.h>

#include <linux/module.h>

#include <linux/platform_device.h>

#include <linux/regmap.h>

#include <linux/slab.h>

#include <linux/mfd/core.h>

#include <linux/mfd/hi655x-pmic.h>



#define HI655X_CLK_BASE	HI655X_BUS_ADDR(0x1c)

#define HI655X_CLK_SET	BIT(6)



struct hi655x_clk {

	struct hi655x_pmic *hi655x;

	struct clk_hw       clk_hw;

};



static unsigned long hi655x_clk_recalc_rate(struct clk_hw *hw,

					    unsigned long parent_rate)

{

	return 32768;

}



static int hi655x_clk_enable(struct clk_hw *hw, bool enable)

{

	struct hi655x_clk *hi655x_clk =

		container_of(hw, struct hi655x_clk, clk_hw);



	struct hi655x_pmic *hi655x = hi655x_clk->hi655x;



	return regmap_update_bits(hi655x->regmap, HI655X_CLK_BASE,

				  HI655X_CLK_SET, enable ? HI655X_CLK_SET : 0);

}



static int hi655x_clk_prepare(struct clk_hw *hw)

{

	return hi655x_clk_enable(hw, true);

}



static void hi655x_clk_unprepare(struct clk_hw *hw)

{

	hi655x_clk_enable(hw, false);

}



static int hi655x_clk_is_prepared(struct clk_hw *hw)

{

	struct hi655x_clk *hi655x_clk =

		container_of(hw, struct hi655x_clk, clk_hw);

	struct hi655x_pmic *hi655x = hi655x_clk->hi655x;

	int ret;

	uint32_t val;



	ret = regmap_read(hi655x->regmap, HI655X_CLK_BASE, &val);

	if (ret < 0)

		return ret;



	return val & HI655X_CLK_BASE;

}



static const struct clk_ops hi655x_clk_ops = {

	.prepare     = hi655x_clk_prepare,

	.unprepare   = hi655x_clk_unprepare,

	.is_prepared = hi655x_clk_is_prepared,

	.recalc_rate = hi655x_clk_recalc_rate,

};



static int hi655x_clk_probe(struct platform_device *pdev)

{

	struct device *parent = pdev->dev.parent;

	struct hi655x_pmic *hi655x = dev_get_drvdata(parent);

	struct hi655x_clk *hi655x_clk;

	const char *clk_name = "hi655x-clk";

	struct clk_init_data init = {

		.name = clk_name,

		.ops = &hi655x_clk_ops

	};

	int ret;



	hi655x_clk = devm_kzalloc(&pdev->dev, sizeof(*hi655x_clk), GFP_KERNEL);

	if (!hi655x_clk)

		return -ENOMEM;



	of_property_read_string_index(parent->of_node, "clock-output-names",

				      0, &clk_name);



	hi655x_clk->clk_hw.init	= &init;

	hi655x_clk->hi655x	= hi655x;



	platform_set_drvdata(pdev, hi655x_clk);



	ret = devm_clk_hw_register(&pdev->dev, &hi655x_clk->clk_hw);

	if (ret)

		return ret;



	return of_clk_add_hw_provider(parent->of_node, of_clk_hw_simple_get,

				     &hi655x_clk->clk_hw);

}



static struct platform_driver hi655x_clk_driver = {

	.probe =  hi655x_clk_probe,

	.driver		= {

		.name	= "hi655x-clk",

	},

};



module_platform_driver(hi655x_clk_driver);



MODULE_DESCRIPTION("Clk driver for the hi655x series PMICs");

MODULE_AUTHOR("Daniel Lezcano <daniel.lezcano@linaro.org>");

MODULE_LICENSE("GPL");

MODULE_ALIAS("platform:hi655x-clk");