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clk: max77686: Convert to the generic max clock driver

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Clocks drivers for Maxim PMIC are very similar so they can
be converted to use the generic Maxim clock driver.

Also, while being there use module_platform_driver() helper
macro to eliminate more boilerplate code.

Signed-off-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Reviewed-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Javier Martinez Canillas 2014-08-18 10:33:01 +02:00 committed by Mike Turquette
parent 5dbbb00f71
commit 1887d69308
2 changed files with 9 additions and 168 deletions
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1
drivers/clk/Kconfig
View file

@ -38,6 +38,7 @@ config COMMON_CLK_MAX_GEN
config COMMON_CLK_MAX77686
tristate "Clock driver for Maxim 77686 MFD"
depends on MFD_MAX77686
select COMMON_CLK_MAX_GEN
---help---
This driver supports Maxim 77686 crystal oscillator clock.

176
drivers/clk/clk-max77686.c
View file

@ -31,187 +31,37 @@
#include <linux/clkdev.h>
#include <dt-bindings/clock/maxim,max77686.h>
struct max77686_clk {
struct max77686_dev *iodev;
u32 mask;
struct clk_hw hw;
struct clk_lookup *lookup;
};
static struct max77686_clk *to_max77686_clk(struct clk_hw *hw)
{
return container_of(hw, struct max77686_clk, hw);
}
static int max77686_clk_prepare(struct clk_hw *hw)
{
struct max77686_clk *max77686 = to_max77686_clk(hw);
return regmap_update_bits(max77686->iodev->regmap,
MAX77686_REG_32KHZ, max77686->mask,
max77686->mask);
}
static void max77686_clk_unprepare(struct clk_hw *hw)
{
struct max77686_clk *max77686 = to_max77686_clk(hw);
regmap_update_bits(max77686->iodev->regmap,
MAX77686_REG_32KHZ, max77686->mask, ~max77686->mask);
}
static int max77686_clk_is_prepared(struct clk_hw *hw)
{
struct max77686_clk *max77686 = to_max77686_clk(hw);
int ret;
u32 val;
ret = regmap_read(max77686->iodev->regmap,
MAX77686_REG_32KHZ, &val);
if (ret < 0)
return -EINVAL;
return val & max77686->mask;
}
static unsigned long max77686_recalc_rate(struct clk_hw *hw,
unsigned long parent_rate)
{
return 32768;
}
static struct clk_ops max77686_clk_ops = {
.prepare = max77686_clk_prepare,
.unprepare = max77686_clk_unprepare,
.is_prepared = max77686_clk_is_prepared,
.recalc_rate = max77686_recalc_rate,
};
#include "clk-max-gen.h"
static struct clk_init_data max77686_clks_init[MAX77686_CLKS_NUM] = {
[MAX77686_CLK_AP] = {
.name = "32khz_ap",
.ops = &max77686_clk_ops,
.ops = &max_gen_clk_ops,
.flags = CLK_IS_ROOT,
},
[MAX77686_CLK_CP] = {
.name = "32khz_cp",
.ops = &max77686_clk_ops,
.ops = &max_gen_clk_ops,
.flags = CLK_IS_ROOT,
},
[MAX77686_CLK_PMIC] = {
.name = "32khz_pmic",
.ops = &max77686_clk_ops,
.ops = &max_gen_clk_ops,
.flags = CLK_IS_ROOT,
},
};
static struct clk *max77686_clk_register(struct device *dev,
struct max77686_clk *max77686)
{
struct clk *clk;
struct clk_hw *hw = &max77686->hw;
clk = clk_register(dev, hw);
if (IS_ERR(clk))
return clk;
max77686->lookup = kzalloc(sizeof(struct clk_lookup), GFP_KERNEL);
if (!max77686->lookup)
return ERR_PTR(-ENOMEM);
max77686->lookup->con_id = hw->init->name;
max77686->lookup->clk = clk;
clkdev_add(max77686->lookup);
return clk;
}
static int max77686_clk_probe(struct platform_device *pdev)
{
struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct max77686_clk *max77686_clks[MAX77686_CLKS_NUM];
struct clk **clocks;
int i, ret;
clocks = devm_kzalloc(&pdev->dev, sizeof(struct clk *)
* MAX77686_CLKS_NUM, GFP_KERNEL);
if (!clocks)
return -ENOMEM;
for (i = 0; i < MAX77686_CLKS_NUM; i++) {
max77686_clks[i] = devm_kzalloc(&pdev->dev,
sizeof(struct max77686_clk), GFP_KERNEL);
if (!max77686_clks[i])
return -ENOMEM;
}
for (i = 0; i < MAX77686_CLKS_NUM; i++) {
max77686_clks[i]->iodev = iodev;
max77686_clks[i]->mask = 1 << i;
max77686_clks[i]->hw.init = &max77686_clks_init[i];
clocks[i] = max77686_clk_register(&pdev->dev, max77686_clks[i]);
if (IS_ERR(clocks[i])) {
ret = PTR_ERR(clocks[i]);
dev_err(&pdev->dev, "failed to register %s\n",
max77686_clks[i]->hw.init->name);
goto err_clocks;
}
}
platform_set_drvdata(pdev, clocks);
if (iodev->dev->of_node) {
struct clk_onecell_data *of_data;
of_data = devm_kzalloc(&pdev->dev,
sizeof(*of_data), GFP_KERNEL);
if (!of_data) {
ret = -ENOMEM;
goto err_clocks;
}
of_data->clks = clocks;
of_data->clk_num = MAX77686_CLKS_NUM;
ret = of_clk_add_provider(iodev->dev->of_node,
of_clk_src_onecell_get, of_data);
if (ret) {
dev_err(&pdev->dev, "failed to register OF clock provider\n");
goto err_clocks;
}
}
return 0;
err_clocks:
for (--i; i >= 0; --i) {
clkdev_drop(max77686_clks[i]->lookup);
clk_unregister(max77686_clks[i]->hw.clk);
}
return ret;
return max_gen_clk_probe(pdev, iodev->regmap, MAX77686_REG_32KHZ,
max77686_clks_init, MAX77686_CLKS_NUM);
}
static int max77686_clk_remove(struct platform_device *pdev)
{
struct max77686_dev *iodev = dev_get_drvdata(pdev->dev.parent);
struct clk **clocks = platform_get_drvdata(pdev);
int i;
if (iodev->dev->of_node)
of_clk_del_provider(iodev->dev->of_node);
for (i = 0; i < MAX77686_CLKS_NUM; i++) {
struct clk_hw *hw = __clk_get_hw(clocks[i]);
struct max77686_clk *max77686 = to_max77686_clk(hw);
clkdev_drop(max77686->lookup);
clk_unregister(clocks[i]);
}
return 0;
return max_gen_clk_remove(pdev, MAX77686_CLKS_NUM);
}
static const struct platform_device_id max77686_clk_id[] = {
@ -230,17 +80,7 @@ static struct platform_driver max77686_clk_driver = {
.id_table = max77686_clk_id,
};
static int __init max77686_clk_init(void)
{
return platform_driver_register(&max77686_clk_driver);
}
subsys_initcall(max77686_clk_init);
static void __init max77686_clk_cleanup(void)
{
platform_driver_unregister(&max77686_clk_driver);
}
module_exit(max77686_clk_cleanup);
module_platform_driver(max77686_clk_driver);
MODULE_DESCRIPTION("MAXIM 77686 Clock Driver");
MODULE_AUTHOR("Jonghwa Lee <jonghwa3.lee@samsung.com>");