Commit 94996038 authored by Phil Elwell's avatar Phil Elwell
Browse files

spi: Make GPIO CSs honour the SPI_NO_CS flag 

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.

See: https://github.com/raspberrypi/linux/issues/2169



Signed-off-by: default avatarPhil Elwell <phil@raspberrypi.org>
parent 00254bf7

drivers/spi/spi.c

+3 −1
Original line number Diff line number Diff line
@@ -729,6 +729,8 @@ static void spi_set_cs(struct spi_device *spi, bool enable) 
		enable = !enable;



	if (gpio_is_valid(spi->cs_gpio)) {

		/* 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) &&