+
+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-gpios", 0, &plat->cs,
+ GPIOD_IS_OUT | cs_flags) ||
+ 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 = "spi-gpio" },
+ { }
+};
+
+U_BOOT_DRIVER(soft_spi) = {
+ .name = "soft_spi",
+ .id = UCLASS_SPI,
+ .of_match = soft_spi_ids,
+ .ops = &soft_spi_ops,
+ .ofdata_to_platdata = soft_spi_ofdata_to_platdata,
+ .platdata_auto_alloc_size = sizeof(struct soft_spi_platdata),
+ .priv_auto_alloc_size = sizeof(struct soft_spi_priv),
+ .probe = soft_spi_probe,
+};