clk: s2mps11: Add support for s2mps11
This patch adds support to register three(AP/CP/BT) buffered 32.768 KHz outputs of mfd-s2mps11 with common clock framework. Signed-off-by: Yadwinder Singh Brar <yadi.brar@samsung.com> Signed-off-by: Mike Turquette <mturquette@linaro.org>
This commit is contained in:
Yadwinder Singh Brar
Mike Turquette
Родитель
a9381b3f9b
Коммит
7cc560dea4
|
|
@ -64,6 +64,12 @@ config COMMON_CLK_SI5351
|
|||
This driver supports Silicon Labs 5351A/B/C programmable clock
|
||||
generators.
|
||||
|
||||
config COMMON_CLK_S2MPS11
|
||||
tristate "Clock driver for S2MPS11 MFD"
|
||||
depends on MFD_SEC_CORE
|
||||
---help---
|
||||
This driver supports S2MPS11 crystal oscillator clock.
|
||||
|
||||
config CLK_TWL6040
|
||||
tristate "External McPDM functional clock from twl6040"
|
||||
depends on TWL6040_CORE
|
||||
|
|
|
|||
|
|
@ -40,5 +40,6 @@ obj-$(CONFIG_COMMON_CLK_AXI_CLKGEN) += clk-axi-clkgen.o
|
|||
obj-$(CONFIG_COMMON_CLK_WM831X) += clk-wm831x.o
|
||||
obj-$(CONFIG_COMMON_CLK_MAX77686) += clk-max77686.o
|
||||
obj-$(CONFIG_COMMON_CLK_SI5351) += clk-si5351.o
|
||||
obj-$(CONFIG_COMMON_CLK_S2MPS11) += clk-s2mps11.o
|
||||
obj-$(CONFIG_CLK_TWL6040) += clk-twl6040.o
|
||||
obj-$(CONFIG_CLK_PPC_CORENET) += clk-ppc-corenet.o
|
||||
|
|
|
|||
|
|
@ -0,0 +1,273 @@
|
|||
/*
|
||||
* clk-s2mps11.c - Clock driver for S2MPS11.
|
||||
*
|
||||
* Copyright (C) 2013 Samsung Electornics
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License as published by the
|
||||
* Free Software Foundation; either version 2 of the License, or (at your
|
||||
* option) any later version.
|
||||
*
|
||||
* This program is distributed in the hope that 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.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||||
*
|
||||
*/
|
||||
|
||||
#include <linux/module.h>
|
||||
#include <linux/err.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/clkdev.h>
|
||||
#include <linux/regmap.h>
|
||||
#include <linux/clk-provider.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/mfd/samsung/s2mps11.h>
|
||||
#include <linux/mfd/samsung/core.h>
|
||||
|
||||
#define s2mps11_name(a) (a->hw.init->name)
|
||||
|
||||
static struct clk **clk_table;
|
||||
static struct clk_onecell_data clk_data;
|
||||
|
||||
enum {
|
||||
S2MPS11_CLK_AP = 0,
|
||||
S2MPS11_CLK_CP,
|
||||
S2MPS11_CLK_BT,
|
||||
S2MPS11_CLKS_NUM,
|
||||
};
|
||||
|
||||
struct s2mps11_clk {
|
||||
struct sec_pmic_dev *iodev;
|
||||
struct clk_hw hw;
|
||||
struct clk *clk;
|
||||
struct clk_lookup *lookup;
|
||||
u32 mask;
|
||||
bool enabled;
|
||||
};
|
||||
|
||||
static struct s2mps11_clk *to_s2mps11_clk(struct clk_hw *hw)
|
||||
{
|
||||
return container_of(hw, struct s2mps11_clk, hw);
|
||||
}
|
||||
|
||||
static int s2mps11_clk_prepare(struct clk_hw *hw)
|
||||
{
|
||||
struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
|
||||
int ret;
|
||||
|
||||
ret = regmap_update_bits(s2mps11->iodev->regmap,
|
||||
S2MPS11_REG_RTC_CTRL,
|
||||
s2mps11->mask, s2mps11->mask);
|
||||
if (!ret)
|
||||
s2mps11->enabled = true;
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static void s2mps11_clk_unprepare(struct clk_hw *hw)
|
||||
{
|
||||
struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
|
||||
int ret;
|
||||
|
||||
ret = regmap_update_bits(s2mps11->iodev->regmap, S2MPS11_REG_RTC_CTRL,
|
||||
s2mps11->mask, ~s2mps11->mask);
|
||||
|
||||
if (!ret)
|
||||
s2mps11->enabled = false;
|
||||
}
|
||||
|
||||
static int s2mps11_clk_is_enabled(struct clk_hw *hw)
|
||||
{
|
||||
struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
|
||||
|
||||
return s2mps11->enabled;
|
||||
}
|
||||
|
||||
static unsigned long s2mps11_clk_recalc_rate(struct clk_hw *hw,
|
||||
unsigned long parent_rate)
|
||||
{
|
||||
struct s2mps11_clk *s2mps11 = to_s2mps11_clk(hw);
|
||||
if (s2mps11->enabled)
|
||||
return 32768;
|
||||
else
|
||||
return 0;
|
||||
}
|
||||
|
||||
static struct clk_ops s2mps11_clk_ops = {
|
||||
.prepare = s2mps11_clk_prepare,
|
||||
.unprepare = s2mps11_clk_unprepare,
|
||||
.is_enabled = s2mps11_clk_is_enabled,
|
||||
.recalc_rate = s2mps11_clk_recalc_rate,
|
||||
};
|
||||
|
||||
static struct clk_init_data s2mps11_clks_init[S2MPS11_CLKS_NUM] = {
|
||||
[S2MPS11_CLK_AP] = {
|
||||
.name = "s2mps11_ap",
|
||||
.ops = &s2mps11_clk_ops,
|
||||
.flags = CLK_IS_ROOT,
|
||||
},
|
||||
[S2MPS11_CLK_CP] = {
|
||||
.name = "s2mps11_cp",
|
||||
.ops = &s2mps11_clk_ops,
|
||||
.flags = CLK_IS_ROOT,
|
||||
},
|
||||
[S2MPS11_CLK_BT] = {
|
||||
.name = "s2mps11_bt",
|
||||
.ops = &s2mps11_clk_ops,
|
||||
.flags = CLK_IS_ROOT,
|
||||
},
|
||||
};
|
||||
|
||||
static struct device_node *s2mps11_clk_parse_dt(struct platform_device *pdev)
|
||||
{
|
||||
struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
|
||||
struct device_node *clk_np;
|
||||
int i;
|
||||
|
||||
if (!iodev->dev->of_node)
|
||||
return NULL;
|
||||
|
||||
clk_np = of_find_node_by_name(iodev->dev->of_node, "clocks");
|
||||
if (!clk_np) {
|
||||
dev_err(&pdev->dev, "could not find clock sub-node\n");
|
||||
return ERR_PTR(-EINVAL);
|
||||
}
|
||||
|
||||
clk_table = devm_kzalloc(&pdev->dev, sizeof(struct clk *) *
|
||||
S2MPS11_CLKS_NUM, GFP_KERNEL);
|
||||
if (!clk_table)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
for (i = 0; i < S2MPS11_CLKS_NUM; i++)
|
||||
of_property_read_string_index(clk_np, "clock-output-names", i,
|
||||
&s2mps11_clks_init[i].name);
|
||||
|
||||
return clk_np;
|
||||
}
|
||||
|
||||
static int s2mps11_clk_probe(struct platform_device *pdev)
|
||||
{
|
||||
struct sec_pmic_dev *iodev = dev_get_drvdata(pdev->dev.parent);
|
||||
struct s2mps11_clk *s2mps11_clks, *s2mps11_clk;
|
||||
struct device_node *clk_np = NULL;
|
||||
int i, ret = 0;
|
||||
u32 val;
|
||||
|
||||
s2mps11_clks = devm_kzalloc(&pdev->dev, sizeof(*s2mps11_clk) *
|
||||
S2MPS11_CLKS_NUM, GFP_KERNEL);
|
||||
if (!s2mps11_clks)
|
||||
return -ENOMEM;
|
||||
|
||||
s2mps11_clk = s2mps11_clks;
|
||||
|
||||
clk_np = s2mps11_clk_parse_dt(pdev);
|
||||
if (IS_ERR(clk_np))
|
||||
return PTR_ERR(clk_np);
|
||||
|
||||
for (i = 0; i < S2MPS11_CLKS_NUM; i++, s2mps11_clk++) {
|
||||
s2mps11_clk->iodev = iodev;
|
||||
s2mps11_clk->hw.init = &s2mps11_clks_init[i];
|
||||
s2mps11_clk->mask = 1 << i;
|
||||
|
||||
ret = regmap_read(s2mps11_clk->iodev->regmap,
|
||||
S2MPS11_REG_RTC_CTRL, &val);
|
||||
if (ret < 0)
|
||||
goto err_reg;
|
||||
|
||||
s2mps11_clk->enabled = val & s2mps11_clk->mask;
|
||||
|
||||
s2mps11_clk->clk = devm_clk_register(&pdev->dev,
|
||||
&s2mps11_clk->hw);
|
||||
if (IS_ERR(s2mps11_clk->clk)) {
|
||||
dev_err(&pdev->dev, "Fail to register : %s\n",
|
||||
s2mps11_name(s2mps11_clk));
|
||||
ret = PTR_ERR(s2mps11_clk->clk);
|
||||
goto err_reg;
|
||||
}
|
||||
|
||||
s2mps11_clk->lookup = devm_kzalloc(&pdev->dev,
|
||||
sizeof(struct clk_lookup), GFP_KERNEL);
|
||||
if (!s2mps11_clk->lookup) {
|
||||
ret = -ENOMEM;
|
||||
goto err_lup;
|
||||
}
|
||||
|
||||
s2mps11_clk->lookup->con_id = s2mps11_name(s2mps11_clk);
|
||||
s2mps11_clk->lookup->clk = s2mps11_clk->clk;
|
||||
|
||||
clkdev_add(s2mps11_clk->lookup);
|
||||
}
|
||||
|
||||
if (clk_table) {
|
||||
for (i = 0; i < S2MPS11_CLKS_NUM; i++)
|
||||
clk_table[i] = s2mps11_clks[i].clk;
|
||||
|
||||
clk_data.clks = clk_table;
|
||||
clk_data.clk_num = S2MPS11_CLKS_NUM;
|
||||
of_clk_add_provider(clk_np, of_clk_src_onecell_get, &clk_data);
|
||||
}
|
||||
|
||||
platform_set_drvdata(pdev, s2mps11_clks);
|
||||
|
||||
return ret;
|
||||
err_lup:
|
||||
devm_clk_unregister(&pdev->dev, s2mps11_clk->clk);
|
||||
err_reg:
|
||||
while (s2mps11_clk > s2mps11_clks) {
|
||||
if (s2mps11_clk->lookup) {
|
||||
clkdev_drop(s2mps11_clk->lookup);
|
||||
devm_clk_unregister(&pdev->dev, s2mps11_clk->clk);
|
||||
}
|
||||
s2mps11_clk--;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int s2mps11_clk_remove(struct platform_device *pdev)
|
||||
{
|
||||
struct s2mps11_clk *s2mps11_clks = platform_get_drvdata(pdev);
|
||||
int i;
|
||||
|
||||
for (i = 0; i < S2MPS11_CLKS_NUM; i++)
|
||||
clkdev_drop(s2mps11_clks[i].lookup);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct platform_device_id s2mps11_clk_id[] = {
|
||||
{ "s2mps11-clk", 0},
|
||||
{ },
|
||||
};
|
||||
MODULE_DEVICE_TABLE(platform, s2mps11_clk_id);
|
||||
|
||||
static struct platform_driver s2mps11_clk_driver = {
|
||||
.driver = {
|
||||
.name = "s2mps11-clk",
|
||||
.owner = THIS_MODULE,
|
||||
},
|
||||
.probe = s2mps11_clk_probe,
|
||||
.remove = s2mps11_clk_remove,
|
||||
.id_table = s2mps11_clk_id,
|
||||
};
|
||||
|
||||
static int __init s2mps11_clk_init(void)
|
||||
{
|
||||
return platform_driver_register(&s2mps11_clk_driver);
|
||||
}
|
||||
subsys_initcall(s2mps11_clk_init);
|
||||
|
||||
static void __init s2mps11_clk_cleanup(void)
|
||||
{
|
||||
platform_driver_unregister(&s2mps11_clk_driver);
|
||||
}
|
||||
module_exit(s2mps11_clk_cleanup);
|
||||
|
||||
MODULE_DESCRIPTION("S2MPS11 Clock Driver");
|
||||
MODULE_AUTHOR("Yadwinder Singh Brar <yadi.brar@samsung.com>");
|
||||
MODULE_LICENSE("GPL");
|
||||
Загрузка…
Ссылка в новой задаче