[PATCH v2 2/6] spi: sun6i: handle chip select polarity flag
Sergey Suloev
ssuloev at orpaltech.com
Fri Mar 30 05:50:43 PDT 2018
The chip select polarity flag is declared as supported
but is not handled in the code.
Signed-off-by: Sergey Suloev <ssuloev at orpaltech.com>
---
drivers/spi/spi-sun6i.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c
index 88ad45e..78acc1f 100644
--- a/drivers/spi/spi-sun6i.c
+++ b/drivers/spi/spi-sun6i.c
@@ -193,6 +193,12 @@ static void sun6i_spi_set_cs(struct spi_device *spi, bool enable)
else
reg &= ~SUN6I_TFR_CTL_CS_LEVEL;
+ /* Handle chip select "reverse" polarity */
+ if (spi->mode & SPI_CS_HIGH)
+ reg &= ~SUN6I_TFR_CTL_SPOL;
+ else
+ reg |= SUN6I_TFR_CTL_SPOL;
+
/* We want to control the chip select manually */
reg |= SUN6I_TFR_CTL_CS_MANUAL;
--
2.16.2
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