From mboxrd@z Thu Jan 1 00:00:00 1970 From: Phil Reid Subject: [PATCH 1/1] spi: sc18is602: Add reset control via gpio pin. Date: Wed, 31 Aug 2016 15:31:38 +0800 Message-ID: <1472628698-10599-2-git-send-email-preid@electromag.com.au> References: <1472628698-10599-1-git-send-email-preid@electromag.com.au> Cc: Phil Reid To: broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org Return-path: In-Reply-To: <1472628698-10599-1-git-send-email-preid-qgqNFa1JUf/o2iN0hyhwsIdd74u8MsAO@public.gmane.org> Sender: linux-spi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-ID: 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 --- drivers/spi/spi-sc18is602.c | 9 +++++++++ 1 file changed, 9 insertions(+) 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 #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; -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-spi" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html