Add optional reset-gpios pin control. If present, de-assert the
specified reset gpio pin to bring the chip out of reset.
Signed-off-by: Steve Longerbeam <steve_longerb...@mentor.com>
---
drivers/gpio/gpio-pca953x.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index 5e3be32..8698815 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -21,6 +21,7 @@
#include <asm/unaligned.h>
#include <linux/of_platform.h>
#include <linux/acpi.h>
+#include <linux/gpio/consumer.h>
#define PCA953X_INPUT 0
#define PCA953X_OUTPUT 1
@@ -111,6 +112,8 @@ struct pca953x_chip {
const char *const *names;
int chip_type;
unsigned long driver_data;
+
+ struct gpio_desc *reset_gpio;
};
static int pca953x_read_single(struct pca953x_chip *chip, int reg, u32 *val,
@@ -759,6 +762,21 @@ static int pca953x_probe(struct i2c_client *client,
} else {
chip->gpio_start = -1;
irq_base = 0;
+
+ /* see if we need to de-assert a reset pin */
+ chip->reset_gpio = devm_gpiod_get_optional(&client->dev,
+ "reset",
+ GPIOD_OUT_LOW);
+ if (IS_ERR(chip->reset_gpio)) {
+ dev_err(&client->dev, "request for reset pin failed\n");
+ return PTR_ERR(chip->reset_gpio);
+ }
+
+ if (chip->reset_gpio) {
+ /* bring chip out of reset */
+ dev_info(&client->dev, "releasing reset\n");
+ gpiod_set_value(chip->reset_gpio, 0);
+ }
}
chip->client = client;
--
1.9.1
--
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