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Commit f9900801 authored by Phil Reid's avatar Phil Reid Committed by Mark Brown
Browse files

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: default avatarPhil Reid <preid@electromag.com.au>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 29b4817d

drivers/spi/spi-sc18is602.c

+9 −0
Original line number Diff line number Diff line
@@ -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;