Add a setup function that can be used to support using generic GPIO lines for the chip select.
Signed-off-by: Alistair Francis <[email protected]> --- drivers/spi/spi-sun6i.c | 27 +++++++++++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c index ec7967be9e2f..fd4e19434942 100644 --- a/drivers/spi/spi-sun6i.c +++ b/drivers/spi/spi-sun6i.c @@ -10,6 +10,7 @@ #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> +#include <linux/gpio.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/module.h> @@ -171,6 +172,31 @@ static inline void sun6i_spi_fill_fifo(struct sun6i_spi *sspi, int len) } } +static int sun6i_spi_setup(struct spi_device *spi) +{ + int ret; + + /* sanity check for native cs */ + if (spi->mode & SPI_NO_CS) + return 0; + if (gpio_is_valid(spi->cs_gpio)) { + /* with gpio-cs set the GPIO to the correct level + * and as output (in case the dt has the gpio not configured + * as output but native cs) + */ + ret = gpio_direction_output(spi->cs_gpio, + (spi->mode & SPI_CS_HIGH) ? 0 : 1); + if (ret) + dev_err(&spi->dev, + "could not set gpio %i as output: %i\n", + spi->cs_gpio, ret); + + return ret; + } + + return 0; +} + static void sun6i_spi_set_cs(struct spi_device *spi, bool enable) { struct sun6i_spi *sspi = spi_master_get_devdata(spi->master); @@ -470,6 +496,7 @@ static int sun6i_spi_probe(struct platform_device *pdev) master->max_speed_hz = 100 * 1000 * 1000; master->min_speed_hz = 3 * 1000; + master->setup = sun6i_spi_setup; master->set_cs = sun6i_spi_set_cs; master->transfer_one = sun6i_spi_transfer_one; master->num_chipselect = 4; -- 2.26.2
