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dm: spi: soft_spi: switch to use linux compatible string

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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: Przemyslaw Marczak <p.marczak@samsung.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Peng Fan 2016-05-03 10:02:21 +08:00 committed by Simon Glass
parent b6d54d5273
commit 102412c415
2 changed files with 33 additions and 15 deletions
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10
arch/arm/dts/exynos4210-universal_c210.dts
View file

@ -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>;

38
drivers/spi/soft_spi.c
View file

@ -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" },
{ }
};