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Commit ab2f3572 authored by Oleksij Rempel's avatar Oleksij Rempel Committed by Mark Brown
Browse files

spi: imx: add SPI_NO_CS support 



To run spi-loopback-tests on HW without modifications, we need to
disable Chip Select. This should avoid surprising side effects for SPI devices
by testing patterns.

Signed-off-by: default avatarOleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 26e4bb86

drivers/spi/spi-imx.c

+8 −1
Original line number Diff line number Diff line
@@ -813,6 +813,9 @@ static void spi_imx_chipselect(struct spi_device *spi, int is_active) 
	int active = is_active != BITBANG_CS_INACTIVE;

	int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH);



	if (spi->mode & SPI_NO_CS)

		return;



	if (!gpio_is_valid(spi->cs_gpio))

		return;
@@ -1139,6 +1142,9 @@ static int spi_imx_setup(struct spi_device *spi) 
	dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__,

		 spi->mode, spi->bits_per_word, spi->max_speed_hz);



	if (spi->mode & SPI_NO_CS)

		return 0;



	if (gpio_is_valid(spi->cs_gpio))

		gpio_direction_output(spi->cs_gpio,

				      spi->mode & SPI_CS_HIGH ? 0 : 1);
@@ -1238,7 +1244,8 @@ static int spi_imx_probe(struct platform_device *pdev) 
	spi_imx->bitbang.master->cleanup = spi_imx_cleanup;

	spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message;

	spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message;

	spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;

	spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \

					     | SPI_NO_CS;

	if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) ||

	    is_imx53_ecspi(spi_imx))

		spi_imx->bitbang.master->mode_bits |= SPI_LOOP | SPI_READY;