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spi/ath79: add missing HIGH->LOW SCK transition

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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>
This commit is contained in:
Gabor Juhos 2012-12-27 10:42:25 +01:00 committed by Grant Likely
parent 440114fdb1
commit 72611db0ee
1 changed files with 2 additions and 0 deletions
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2
drivers/spi/spi-ath79.c
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@ -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;
}