1. Support compatible string "spi-gpio" which is used by Linux Linux use different bindings, so use UBOOT_COMPAT and LINUX_COMPAT to differentiate them. 2. Introduce SPI_MASTER_NO_RX and SPI_MASTER_NO_TX to handle no rx or no tx case. 3. Tested on i.MX6 UltraLite board with 74LV595 spi-gpio chip.
Signed-off-by: Peng Fan van.freenix@gmail.com Cc: Simon Glass sjg@chromium.org Cc: Jagan Teki jteki@openedev.com Cc: Przemyslaw Marczak p.marczak@samsung.com Reviewed-by: Simon Glass sjg@chromium.org ---
V3: None V2: Follow Simon's comments, drop uboot compatible string, convert to use Linux compatile string, and convert the universal board.
arch/arm/dts/exynos4210-universal_c210.dts | 10 ++++---- drivers/spi/soft_spi.c | 38 ++++++++++++++++++++++-------- 2 files changed, 33 insertions(+), 15 deletions(-)
diff --git a/arch/arm/dts/exynos4210-universal_c210.dts b/arch/arm/dts/exynos4210-universal_c210.dts index 16948c9..ad3527e 100644 --- a/arch/arm/dts/exynos4210-universal_c210.dts +++ b/arch/arm/dts/exynos4210-universal_c210.dts @@ -42,11 +42,11 @@ };
soft-spi { - compatible = "u-boot,soft-spi"; - cs-gpio = <&gpy4 3 0>; - sclk-gpio = <&gpy3 1 0>; - mosi-gpio = <&gpy3 3 0>; - miso-gpio = <&gpy3 0 0>; + compatible = "spi-gpio"; + cs-gpios = <&gpy4 3 0>; + gpio-sck = <&gpy3 1 0>; + gpio-mosi = <&gpy3 3 0>; + gpio-miso = <&gpy3 0 0>; spi-delay-us = <1>; #address-cells = <1>; #size-cells = <0>; diff --git a/drivers/spi/soft_spi.c b/drivers/spi/soft_spi.c index 8cdb520..d23dc81 100644 --- a/drivers/spi/soft_spi.c +++ b/drivers/spi/soft_spi.c @@ -26,8 +26,12 @@ struct soft_spi_platdata { struct gpio_desc mosi; struct gpio_desc miso; int spi_delay_us; + int flags; };
+#define SPI_MASTER_NO_RX BIT(0) +#define SPI_MASTER_NO_TX BIT(1) + struct soft_spi_priv { unsigned int mode; }; @@ -139,14 +143,16 @@ static int soft_spi_xfer(struct udevice *dev, unsigned int bitlen,
if (!cpha) soft_spi_scl(dev, 0); - soft_spi_sda(dev, !!(tmpdout & 0x80)); + if ((plat->flags & SPI_MASTER_NO_TX) == 0) + soft_spi_sda(dev, !!(tmpdout & 0x80)); udelay(plat->spi_delay_us); if (cpha) soft_spi_scl(dev, 0); else soft_spi_scl(dev, 1); tmpdin <<= 1; - tmpdin |= dm_gpio_get_value(&plat->miso); + if ((plat->flags & SPI_MASTER_NO_RX) == 0) + tmpdin |= dm_gpio_get_value(&plat->miso); tmpdout <<= 1; udelay(plat->spi_delay_us); if (cpha) @@ -208,24 +214,36 @@ static int soft_spi_probe(struct udevice *dev) struct spi_slave *slave = dev_get_parent_priv(dev); struct soft_spi_platdata *plat = dev->platdata; int cs_flags, clk_flags; + int ret;
cs_flags = (slave->mode & SPI_CS_HIGH) ? 0 : GPIOD_ACTIVE_LOW; clk_flags = (slave->mode & SPI_CPOL) ? GPIOD_ACTIVE_LOW : 0; - if (gpio_request_by_name(dev, "cs-gpio", 0, &plat->cs, + + if (gpio_request_by_name(dev, "cs-gpios", 0, &plat->cs, GPIOD_IS_OUT | cs_flags) || - gpio_request_by_name(dev, "sclk-gpio", 0, &plat->sclk, - GPIOD_IS_OUT | clk_flags) || - gpio_request_by_name(dev, "mosi-gpio", 0, &plat->mosi, - GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE) || - gpio_request_by_name(dev, "miso-gpio", 0, &plat->miso, - GPIOD_IS_IN)) + gpio_request_by_name(dev, "gpio-sck", 0, &plat->sclk, + GPIOD_IS_OUT | clk_flags)) + return -EINVAL; + + ret = gpio_request_by_name(dev, "gpio-mosi", 0, &plat->mosi, + GPIOD_IS_OUT | GPIOD_IS_OUT_ACTIVE); + if (ret) + plat->flags |= SPI_MASTER_NO_TX; + + ret = gpio_request_by_name(dev, "gpio-miso", 0, &plat->miso, + GPIOD_IS_IN); + if (ret) + plat->flags |= SPI_MASTER_NO_RX; + + if ((plat->flags & (SPI_MASTER_NO_RX | SPI_MASTER_NO_TX)) == + (SPI_MASTER_NO_RX | SPI_MASTER_NO_TX)) return -EINVAL;
return 0; }
static const struct udevice_id soft_spi_ids[] = { - { .compatible = "u-boot,soft-spi" }, + { .compatible = "spi-gpio" }, { } };