From f99008013e199e6b88ef26c98ecb042c94c7450c Mon Sep 17 00:00:00 2001 From: Phil Reid Date: Wed, 31 Aug 2016 15:31:38 +0800 Subject: 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 Signed-off-by: Mark Brown --- drivers/spi/spi-sc18is602.c | 9 +++++++++ 1 file changed, 9 insertions(+) (limited to 'drivers/spi/spi-sc18is602.c') diff --git a/drivers/spi/spi-sc18is602.c b/drivers/spi/spi-sc18is602.c index 36af4d48a700..5666b5d20b87 100644 --- a/drivers/spi/spi-sc18is602.c +++ b/drivers/spi/spi-sc18is602.c @@ -23,6 +23,7 @@ #include #include #include +#include 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; -- cgit v1.2.3