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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>
This commit is contained in:
Phil Reid 2016-08-31 15:31:38 +08:00 committed by Mark Brown
parent 29b4817d40
commit f99008013e
1 changed files with 9 additions and 0 deletions
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9
drivers/spi/spi-sc18is602.c
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@ -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 @@ struct sc18is602 {
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 @@ static int sc18is602_probe(struct i2c_client *client,
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;