diff options
| author | Baruch Siach <baruch@tkos.co.il> | 2014-01-31 11:07:47 +0100 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2014-04-24 19:09:05 +0200 |
| commit | d9c73bb8a3a5e4b76d2ad55da00d9ea776475c81 (patch) | |
| tree | f711caf00b7025672dc919e5896a597535588111 /drivers/spi/spi-dw.h | |
| parent | spi: dw: document device tree binding (diff) | |
| download | linux-d9c73bb8a3a5e4b76d2ad55da00d9ea776475c81.tar.xz linux-d9c73bb8a3a5e4b76d2ad55da00d9ea776475c81.zip | |
spi: dw: add support for gpio controlled chip select
Also, use this opportunity to let spi_chip_sel() handle chip-select
deactivation as well.
Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Mark Brown <broonie@linaro.org>
Diffstat (limited to 'drivers/spi/spi-dw.h')
| -rw-r--r-- | drivers/spi/spi-dw.h | 16 |
1 files changed, 11 insertions, 5 deletions
diff --git a/drivers/spi/spi-dw.h b/drivers/spi/spi-dw.h index 3fd7ab599ab4..6d2acad34f64 100644 --- a/drivers/spi/spi-dw.h +++ b/drivers/spi/spi-dw.h @@ -3,6 +3,7 @@ #include <linux/io.h> #include <linux/scatterlist.h> +#include <linux/gpio.h> /* Register offsets */ #define DW_SPI_CTRL0 0x00 @@ -178,15 +179,20 @@ static inline void spi_set_clk(struct dw_spi *dws, u16 div) dw_writel(dws, DW_SPI_BAUDR, div); } -static inline void spi_chip_sel(struct dw_spi *dws, u16 cs) +static inline void spi_chip_sel(struct dw_spi *dws, struct spi_device *spi, + int active) { - if (cs > dws->num_cs) - return; + u16 cs = spi->chip_select; + int gpio_val = active ? (spi->mode & SPI_CS_HIGH) : + !(spi->mode & SPI_CS_HIGH); if (dws->cs_control) - dws->cs_control(1); + dws->cs_control(active); + if (gpio_is_valid(spi->cs_gpio)) + gpio_set_value(spi->cs_gpio, gpio_val); - dw_writel(dws, DW_SPI_SER, 1 << cs); + if (active) + dw_writel(dws, DW_SPI_SER, 1 << cs); } /* Disable IRQ bits */ |