From f72efa7e690ab5c4068ccba31c4da032bc45c29c Mon Sep 17 00:00:00 2001 From: Leif Middelschulte Date: Sun, 23 Apr 2017 21:19:58 +0200 Subject: spi-imx: Implements handling of the SPI_READY mode flag. This patch implements consideration of the SPI_READY mode flag as defined in spi.h. It extends the device tree bindings to support the values defined by the reference manual for the DRCTL field. Thus supporting edge-triggered and level-triggered bursts. Signed-off-by: Leif Middelschulte Signed-off-by: Mark Brown --- drivers/spi/spi-imx.c | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) (limited to 'drivers/spi') diff --git a/drivers/spi/spi-imx.c b/drivers/spi/spi-imx.c index 9a7c62f471dc..b402530a7a9a 100644 --- a/drivers/spi/spi-imx.c +++ b/drivers/spi/spi-imx.c @@ -95,6 +95,7 @@ struct spi_imx_data { unsigned int spi_bus_clk; unsigned int bytes_per_word; + unsigned int spi_drctl; unsigned int count; void (*tx)(struct spi_imx_data *); @@ -246,6 +247,7 @@ static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, #define MX51_ECSPI_CTRL_XCH (1 << 2) #define MX51_ECSPI_CTRL_SMC (1 << 3) #define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4) +#define MX51_ECSPI_CTRL_DRCTL(drctl) ((drctl) << 16) #define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8 #define MX51_ECSPI_CTRL_PREDIV_OFFSET 12 #define MX51_ECSPI_CTRL_CS(cs) ((cs) << 18) @@ -355,6 +357,12 @@ static int mx51_ecspi_config(struct spi_device *spi, */ ctrl |= MX51_ECSPI_CTRL_MODE_MASK; + /* + * Enable SPI_RDY handling (falling edge/level triggered). + */ + if (spi->mode & SPI_READY) + ctrl |= MX51_ECSPI_CTRL_DRCTL(spi_imx->spi_drctl); + /* set clock speed */ ctrl |= mx51_ecspi_clkdiv(spi_imx, config->speed_hz, &clk); spi_imx->spi_bus_clk = clk; @@ -1173,7 +1181,7 @@ static int spi_imx_probe(struct platform_device *pdev) struct spi_master *master; struct spi_imx_data *spi_imx; struct resource *res; - int i, ret, irq; + int i, ret, irq, spi_drctl; if (!np && !mxc_platform_info) { dev_err(&pdev->dev, "can't get the platform data\n"); @@ -1181,6 +1189,12 @@ static int spi_imx_probe(struct platform_device *pdev) } master = spi_alloc_master(&pdev->dev, sizeof(struct spi_imx_data)); + ret = of_property_read_u32(np, "fsl,spi-rdy-drctl", &spi_drctl); + if ((ret < 0) || (spi_drctl >= 0x3)) { + /* '11' is reserved */ + spi_drctl = 0; + } + if (!master) return -ENOMEM; @@ -1216,7 +1230,9 @@ static int spi_imx_probe(struct platform_device *pdev) spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message; spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx)) - spi_imx->bitbang.master->mode_bits |= SPI_LOOP; + spi_imx->bitbang.master->mode_bits |= SPI_LOOP | SPI_READY; + + spi_imx->spi_drctl = spi_drctl; init_completion(&spi_imx->xfer_done); -- cgit v1.2.3