openwrt/target/linux/ar71xx/patches-3.10/200-spi-ath79-fix-initial-GPIO-CS-line-setup.patch

From 3a7853f0dd24e81dc920c98a5c7e8cfdde81bb45 Mon Sep 17 00:00:00 2001
From: Gabor Juhos <[email protected]>
Date: Thu, 16 Jan 2014 16:58:58 +0100
Subject: [PATCH] spi-ath79: fix initial GPIO CS line setup

The 'ath79_spi_setup_cs' function initializes the chip
select line of a given SPI device in order to make sure
that the device is inactive.

If the SPI_CS_HIGH bit is set for a given device, it
means that the CS line of that device is active HIGH
so it must be set to LOW initially. In case of GPIO
CS lines, the 'ath79_spi_setup_cs' function does the
opposite of that due to the wrong GPIO flags.

Fix the code to use the correct GPIO flags.

Reported-by: Ronald Wahl <[email protected]>
Signed-off-by: Gabor Juhos <[email protected]>
---
 drivers/spi/spi-ath79.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/spi/spi-ath79.c
+++ b/drivers/spi/spi-ath79.c
@@ -132,9 +132,9 @@ static int ath79_spi_setup_cs(struct spi
 
 		flags = GPIOF_DIR_OUT;
 		if (spi->mode & SPI_CS_HIGH)
-			flags |= GPIOF_INIT_HIGH;
-		else
 			flags |= GPIOF_INIT_LOW;
+		else
+			flags |= GPIOF_INIT_HIGH;
 
 		status = gpio_request_one(cdata->gpio, flags,
 					  dev_name(&spi->dev));