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authorSteve Longerbeam <slongerbeam@gmail.com>2017-01-10 22:29:51 +0300
committerLinus Walleij <linus.walleij@linaro.org>2017-01-11 18:35:23 +0300
commit054ccdef8b2850be3aee8cbd49000e6d61f837b2 (patch)
treedc24c25076ba21e8aa7c32ddd1e547bf610faca3 /drivers/gpio/gpio-pca953x.c
parent3d301cb938c158f2e4b23cf7c176e3816c86dfbb (diff)
downloadlinux-054ccdef8b2850be3aee8cbd49000e6d61f837b2.tar.xz
gpio: pca953x: Add optional reset gpio control
Add optional reset-gpios pin control. If present, de-assert the specified reset gpio pin to bring the chip out of reset. v2: - Specify that reset signal to PCA953x chip is active low, in binding doc. - reorder includes in gpio-pca953x.c. - remove dev_err() on devm_gpiod_get_optional() error return. Cc: Alexandre Courbot <gnurou@gmail.com> Cc: linux-gpio@vger.kernel.org Cc: linux-kernel@vger.kernel.org Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/gpio-pca953x.c')
-rw-r--r--drivers/gpio/gpio-pca953x.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index d5d72d84b719..d44232aadb6c 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -14,6 +14,7 @@
#include <linux/module.h>
#include <linux/init.h>
#include <linux/gpio.h>
+#include <linux/gpio/consumer.h>
#include <linux/interrupt.h>
#include <linux/i2c.h>
#include <linux/platform_data/pca953x.h>
@@ -754,8 +755,16 @@ static int pca953x_probe(struct i2c_client *client,
invert = pdata->invert;
chip->names = pdata->names;
} else {
+ struct gpio_desc *reset_gpio;
+
chip->gpio_start = -1;
irq_base = 0;
+
+ /* See if we need to de-assert a reset pin */
+ reset_gpio = devm_gpiod_get_optional(&client->dev, "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(reset_gpio))
+ return PTR_ERR(reset_gpio);
}
chip->client = client;