[RFC PATCH] spi: Ensure that CS line is in non-active state after setup

From: Ivan T. Ivanov
Date: Fri Mar 06 2015 - 10:45:28 EST


When drivers didn't provide setup() method, SPI core should ensure
that CS line is driven in non-active state after spi_setup().

Signed-off-by: Ivan T. Ivanov <iivanov@xxxxxxxxxx>
---
drivers/spi/spi.c | 2 ++
1 file changed, 2 insertions(+)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index c64a3e5..bfba2d9 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -1895,6 +1895,8 @@ int spi_setup(struct spi_device *spi)

if (spi->master->setup)
status = spi->master->setup(spi);
+ else
+ spi_set_cs(spi, false);

dev_dbg(&spi->dev, "setup mode %d, %s%s%s%s%u bits/w, %u Hz max --> %d\n",
(int) (spi->mode & (SPI_CPOL | SPI_CPHA)),
--
1.9.1

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