Commit 054ccdef authored by Steve Longerbeam's avatar Steve Longerbeam Committed by Linus Walleij

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: default avatarSteve Longerbeam <steve_longerbeam@mentor.com>
Reviewed-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: default avatarVladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Signed-off-by: default avatarLinus Walleij <linus.walleij@linaro.org>
parent 3d301cb9
...@@ -29,6 +29,10 @@ Required properties: ...@@ -29,6 +29,10 @@ Required properties:
onsemi,pca9654 onsemi,pca9654
exar,xra1202 exar,xra1202
Optional properties:
- reset-gpios: GPIO specification for the RESET input. This is an
active low signal to the PCA953x.
Example: Example:
......
...@@ -14,6 +14,7 @@ ...@@ -14,6 +14,7 @@
#include <linux/module.h> #include <linux/module.h>
#include <linux/init.h> #include <linux/init.h>
#include <linux/gpio.h> #include <linux/gpio.h>
#include <linux/gpio/consumer.h>
#include <linux/interrupt.h> #include <linux/interrupt.h>
#include <linux/i2c.h> #include <linux/i2c.h>
#include <linux/platform_data/pca953x.h> #include <linux/platform_data/pca953x.h>
...@@ -754,8 +755,16 @@ static int pca953x_probe(struct i2c_client *client, ...@@ -754,8 +755,16 @@ static int pca953x_probe(struct i2c_client *client,
invert = pdata->invert; invert = pdata->invert;
chip->names = pdata->names; chip->names = pdata->names;
} else { } else {
struct gpio_desc *reset_gpio;
chip->gpio_start = -1; chip->gpio_start = -1;
irq_base = 0; 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; chip->client = client;
......
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