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clk: RK808: add clkout driver for RK808

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This is the initial version of the RK808 PMIC.  This is a power management
IC for multimedia products.  It provides regulators that are able to
supply power to processor cores and other components.  The chip provides
other modules including RTC, Clockout.

Signed-off-by: Chris Zhong <zyw@rock-chips.com>
Reviewed-by: Doug Anderson <dianders@chromium.org>
Tested-by: Doug Anderson <dianders@chromium.org>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Ian Campbell <ijc+devicetree@hellion.org.uk>
Cc: Samuel Ortiz <sameo@linux.intel.com> says:
Cc: Alessandro Zummo <a.zummo@towertech.it>
Cc: Olof Johansson <olof@lixom.net>
Cc: Dmitry Torokhov <dtor@chromium.org>
Cc: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Cc: Kever Yang <kever.yang@rock-chips.com>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Russell King <rmk@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chris Zhong 2014-10-13 15:52:44 -07:00 committed by Linus Torvalds
parent 3ca1e326f5
commit 038b892aa9
3 changed files with 180 additions and 0 deletions
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9
drivers/clk/Kconfig
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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

1
drivers/clk/Makefile
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@ -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

170
drivers/clk/clk-rk808.c Normal file
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@ -0,0 +1,170 @@
/*
* 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");