spi: sc18is602: Add reset control via gpio pin.
This sc18is602 has a reset pin that may need to be deasserted.
Add optional binding to specifiy the reset pin via a gpio and deassert
during probe.
Signed-off-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/spi/spi-sc18is602.c b/drivers/spi/spi-sc18is602.c
index 36af4d4..5666b5d 100644
--- a/drivers/spi/spi-sc18is602.c
+++ b/drivers/spi/spi-sc18is602.c
@@ -23,6 +23,7 @@
#include <linux/pm_runtime.h>
#include <linux/of.h>
#include <linux/platform_data/sc18is602.h>
+#include <linux/gpio/consumer.h>
enum chips { sc18is602, sc18is602b, sc18is603 };
@@ -50,6 +51,8 @@
u8 buffer[SC18IS602_BUFSIZ + 1];
int tlen; /* Data queued for tx in buffer */
int rindex; /* Receive data index in buffer */
+
+ struct gpio_desc *reset;
};
static int sc18is602_wait_ready(struct sc18is602 *hw, int len)
@@ -257,6 +260,12 @@
hw = spi_master_get_devdata(master);
i2c_set_clientdata(client, hw);
+ /* assert reset and then release */
+ hw->reset = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_HIGH);
+ if (IS_ERR(hw->reset))
+ return PTR_ERR(hw->reset);
+ gpiod_set_value(hw->reset, 0);
+
hw->master = master;
hw->client = client;
hw->dev = dev;