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List:       linux-spi
Subject:    [PATCH 2/6] spi: sun6i: handle chip select polarity flag
From:       Sergey Suloev <ssuloev () orpaltech ! com>
Date:       2018-03-30 7:22:39
Message-ID: 20180330072243.19368-3-ssuloev () orpaltech ! com
[Download RAW message or body]

The chip select polarity flag is declared as supported
but is not handled in the code.

Signed-off-by: Sergey Suloev <ssuloev@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 ff790dc..f992a7d 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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