[PATCH v1] tty: serial: max310x: Add optional reset gpio
From: Mylène Josserand <hidden>
Date: 2019-06-14 14:11:31
Also in:
linux-devicetree, lkml
Subsystem:
open firmware and flattened device tree bindings, the rest, tty layer and serial drivers · Maintainers:
Rob Herring, Krzysztof Kozlowski, Conor Dooley, Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
Add the possibility to use a gpio as reset. Signed-off-by: Mylène Josserand <redacted> --- 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