From ab2f357223eb8fa6acc96bfa002053b6f1f92341 Mon Sep 17 00:00:00 2001 From: Oleksij Rempel Date: Tue, 25 Jul 2017 09:57:09 +0200 Subject: [PATCH] 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: Oleksij Rempel Signed-off-by: Mark Brown --- drivers/spi/spi-imx.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 424dd013451e..930e47597db3 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -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; -- 2.20.1