Commit 72611db0 authored Dec 27, 2012 by Gabor Juhos Committed by Grant Likely Feb 05, 2013

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 <juhosg@openwrt.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

parent 440114fd

drivers/spi/spi-ath79.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}

Admin message