Add the possibility to use a gpio as reset.
Signed-off-by: Mylène Josserand <mylene.josserand@xxxxxxxxxxx>
---
Documentation/devicetree/bindings/serial/maxim,max310x.txt | 1 +
drivers/tty/serial/max310x.c | 7 +++++++
2 files changed, 8 insertions(+)
diff --git a/Documentation/devicetree/bindings/serial/maxim,max310x.txt b/Documentation/devicetree/bindings/serial/maxim,max310x.txt
index 79e10a05a96a..1d7d8a0b4260 100644
--- a/Documentation/devicetree/bindings/serial/maxim,max310x.txt
+++ b/Documentation/devicetree/bindings/serial/maxim,max310x.txt
@@ -15,6 +15,7 @@ Required properties:
"osc" if an external clock source is used.
Optional properties:
+- reset-gpios: Gpio to use for reset.
- gpio-controller: Marks the device node as a GPIO controller.
- #gpio-cells: Should be two. The first cell is the GPIO number and
the second cell is used to specify the GPIO polarity:
diff --git a/drivers/tty/serial/max310x.c b/drivers/tty/serial/max310x.c
index e5aebbf5f302..d056fa2eed1b 100644
--- a/drivers/tty/serial/max310x.c
+++ b/drivers/tty/serial/max310x.c
@@ -14,6 +14,7 @@
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/gpio/driver.h>
+#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
@@ -1413,12 +1414,18 @@ static int max310x_spi_probe(struct spi_device *spi)
return ret;
if (spi->dev.of_node) {
+ struct gpio_desc *reset_gpio;
const struct of_device_id *of_id =
of_match_device(max310x_dt_ids, &spi->dev);
if (!of_id)
return -ENODEV;
devtype = (struct max310x_devtype *)of_id->data;
+ reset_gpio = devm_gpiod_get_optional(&spi->dev, "reset",
+ GPIOD_OUT_HIGH);
+ if (IS_ERR(reset_gpio))
+ return PTR_ERR(reset_gpio);
+ gpiod_set_value_cansleep(reset_gpio, 0);
} else {
const struct spi_device_id *id_entry = spi_get_device_id(spi);
--
2.11.0
