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mfd: arizona: Update reset pin to use GPIOD

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Now GPIOD has support for both pdata systems and for non-standard DT
bindings the Arizona reset GPIO can be converted to use it. Worth
noting gpiod_set_raw_value_cansleep is used to match the behaviour
of the old GPIOs. This is because the part is fairly widely used and
it is unknown how many DTs are correctly setting active low through
device tree, so to avoid breaking any existing users it is best to
match the previous behaviour.

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Charles Keepax
2018-03-12 15:52:00 +00:00
committed by Lee Jones
parent e03273e48d
commit c18604660a
2 changed files with 37 additions and 19 deletions
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53
drivers/mfd/arizona-core.c
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@@ -13,13 +13,12 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/mfd/core.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
@@ -279,7 +278,7 @@ static int arizona_wait_for_boot(struct arizona *arizona)
static inline void arizona_enable_reset(struct arizona *arizona)
{
if (arizona->pdata.reset)
gpio_set_value_cansleep(arizona->pdata.reset, 0);
gpiod_set_raw_value_cansleep(arizona->pdata.reset, 0);
}
static void arizona_disable_reset(struct arizona *arizona)
@@ -295,7 +294,7 @@ static void arizona_disable_reset(struct arizona *arizona)
break;
}
gpio_set_value_cansleep(arizona->pdata.reset, 1);
gpiod_set_raw_value_cansleep(arizona->pdata.reset, 1);
usleep_range(1000, 5000);
}
}
@@ -799,14 +798,27 @@ static int arizona_of_get_core_pdata(struct arizona *arizona)
struct arizona_pdata *pdata = &arizona->pdata;
int ret, i;
pdata->reset = of_get_named_gpio(arizona->dev->of_node, "wlf,reset", 0);
if (pdata->reset == -EPROBE_DEFER) {
return pdata->reset;
} else if (pdata->reset < 0) {
dev_err(arizona->dev, "Reset GPIO missing/malformed: %d\n",
pdata->reset);
/* Handle old non-standard DT binding */
pdata->reset = devm_gpiod_get_from_of_node(arizona->dev,
arizona->dev->of_node,
"wlf,reset", 0,
GPIOD_OUT_LOW,
"arizona /RESET");
if (IS_ERR(pdata->reset)) {
ret = PTR_ERR(pdata->reset);
pdata->reset = 0;
/*
* Reset missing will be caught when other binding is read
* but all other errors imply this binding is in use but has
* encountered a problem so should be handled.
*/
if (ret == -EPROBE_DEFER)
return ret;
else if (ret != -ENOENT && ret != -ENOSYS)
dev_err(arizona->dev, "Reset GPIO malformed: %d\n",
ret);
pdata->reset = NULL;
}
ret = of_property_read_u32_array(arizona->dev->of_node,
@@ -1050,14 +1062,19 @@ int arizona_dev_init(struct arizona *arizona)
goto err_early;
}
if (arizona->pdata.reset) {
if (!arizona->pdata.reset) {
/* Start out with /RESET low to put the chip into reset */
ret = devm_gpio_request_one(arizona->dev, arizona->pdata.reset,
GPIOF_DIR_OUT | GPIOF_INIT_LOW,
"arizona /RESET");
if (ret != 0) {
dev_err(dev, "Failed to request /RESET: %d\n", ret);
goto err_dcvdd;
arizona->pdata.reset = devm_gpiod_get(arizona->dev, "reset",
GPIOD_OUT_LOW);
if (IS_ERR(arizona->pdata.reset)) {
ret = PTR_ERR(arizona->pdata.reset);
if (ret == -EPROBE_DEFER)
goto err_dcvdd;
dev_err(arizona->dev,
"Reset GPIO missing/malformed: %d\n", ret);
arizona->pdata.reset = NULL;
}
}