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authorCharles Keepax2018-03-12 15:52:00 +0000
committerLee Jones2018-05-16 09:21:48 +0100
commitc18604660ad02324dfc21de5dfd0c8d15e9070a5 (patch)
tree34f2be7212a6060bc9a1641a812188ef750af37f
parente03273e48da64083ef66394b4338361886c9a64d (diff)
mfd: arizona: Update reset pin to use GPIOD
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>
-rw-r--r--drivers/mfd/arizona-core.c53
-rw-r--r--include/linux/mfd/arizona/pdata.h3
2 files changed, 37 insertions, 19 deletions
diff --git a/drivers/mfd/arizona-core.c b/drivers/mfd/arizona-core.c
index 77875250abe5..83f1c5a516d9 100644
--- a/drivers/mfd/arizona-core.c
+++ b/drivers/mfd/arizona-core.c
@@ -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;
}
}
diff --git a/include/linux/mfd/arizona/pdata.h b/include/linux/mfd/arizona/pdata.h
index f72dc53848d7..0013075d4cda 100644
--- a/include/linux/mfd/arizona/pdata.h
+++ b/include/linux/mfd/arizona/pdata.h
@@ -56,6 +56,7 @@
#define ARIZONA_MAX_PDM_SPK 2
struct regulator_init_data;
+struct gpio_desc;
struct arizona_micbias {
int mV; /** Regulated voltage */
@@ -77,7 +78,7 @@ struct arizona_micd_range {
};
struct arizona_pdata {
- int reset; /** GPIO controlling /RESET, if any */
+ struct gpio_desc *reset; /** GPIO controlling /RESET, if any */
/** Regulator configuration for MICVDD */
struct arizona_micsupp_pdata micvdd;