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spi: Make GPIO CSs honour the SPI_NO_CS flag

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The SPI configuration state includes an SPI_NO_CS flag that disables
all CS line manipulation, for applications that want to manage their
own chip selects. However, this flag is ignored by the GPIO CS code
in the SPI framework.

Correct this omission with a trivial patch.

Signed-off-by: Phil Elwell <phil@raspberrypi.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Phil Elwell 2018-10-12 10:23:18 +01:00 committed by Mark Brown
parent 44221ebae2
commit 25972d0c33
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GPG Key ID: 24D68B725D5487D0
1 changed files with 3 additions and 1 deletions
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4
drivers/spi/spi.c
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@ -775,7 +775,9 @@ static void spi_set_cs(struct spi_device *spi, bool enable)
enable = !enable;
if (gpio_is_valid(spi->cs_gpio)) {
gpio_set_value(spi->cs_gpio, !enable);
/* Honour the SPI_NO_CS flag */
if (!(spi->mode & SPI_NO_CS))
gpio_set_value(spi->cs_gpio, !enable);
/* Some SPI masters need both GPIO CS & slave_select */
if ((spi->controller->flags & SPI_MASTER_GPIO_SS) &&
spi->controller->set_cs)