1 From c7c943b1e3813ff5764ee6417a14530cb7cd6f57 Mon Sep 17 00:00:00 2001
2 From: Gabor Juhos <juhosg@openwrt.org>
3 Date: Thu, 27 Dec 2012 10:42:25 +0100
4 Subject: [PATCH] spi/ath79: add missing HIGH->LOW SCK transition
6 commit 72611db0eef21f4456d79ba302af4b34ea384f30 upstream.
8 The 'ath79_spi_txrx_mode0' function does not
9 set the SCK signal to LOW at the end of a word
10 transfer. This causes communications errors with
11 certain devices (e.g. the PCF2123 RTC chip).
13 The patch ensures that the SCK signal will be LOW.
15 Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
16 Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
18 drivers/spi/spi-ath79.c | 2 ++
19 1 file changed, 2 insertions(+)
21 --- a/drivers/spi/spi-ath79.c
22 +++ b/drivers/spi/spi-ath79.c
23 @@ -200,6 +200,8 @@ static u32 ath79_spi_txrx_mode0(struct s
24 ath79_spi_delay(sp, nsecs);
25 ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out | AR71XX_SPI_IOC_CLK);
26 ath79_spi_delay(sp, nsecs);
28 + ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, out);