From 72611db0eef21f4456d79ba302af4b34ea384f30 Mon Sep 17 00:00:00 2001 From: Gabor Juhos Date: Thu, 27 Dec 2012 10:42:25 +0100 Subject: [PATCH] spi/ath79: add missing HIGH->LOW SCK transition The 'ath79_spi_txrx_mode0' function does not set the SCK signal to LOW at the end of a word transfer. This causes communications errors with certain devices (e.g. the PCF2123 RTC chip). The patch ensures that the SCK signal will be LOW. Signed-off-by: Gabor Juhos Signed-off-by: Grant Likely --- drivers/spi/spi-ath79.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/spi/spi-ath79.c b/drivers/spi/spi-ath79.c index e02528244451..d4b8e1236612 100644 --- a/drivers/spi/spi-ath79.c +++ b/drivers/spi/spi-ath79.c @@ -200,6 +200,8 @@ static u32 ath79_spi_txrx_mode0(struct spi_device *spi, unsigned nsecs, ath79_spi_delay(sp, nsecs); ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out | AR71XX_SPI_IOC_CLK); ath79_spi_delay(sp, nsecs); + if (bits == 1) + ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out); word <<= 1; } -- 2.20.1