[U-Boot] [PATCH v4] dm: spi: Read default speed and mode values from DT

[Vignesh R]

In case of DT boot, don't read default speed and mode for SPI from
CONFIG_*, instead read from DT node. This will make sure that boards
with multiple SPI/QSPI controllers can be probed at different
bus frequencies and SPI modes.

Signed-off-by: Vignesh R <vigneshr at ti.com>
Reviewed-by: Simon Glass <sjg at chromium.org>
Reviewed-by: Mugunthan V N <mugunthanvnm at ti.com>

---

v4: Update env_sf.c as well

v3: Update commit message to mention SPI mode changes

v2: Initialize speed, mode to 0 instead of -1

 cmd/sf.c                 | 2 ++
 common/env_sf.c          | 8 ++++----
 drivers/spi/spi-uclass.c | 8 ++++++--
 3 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/cmd/sf.c b/cmd/sf.c
index 42862d9d921a..286906c3a151 100644
--- a/cmd/sf.c
+++ b/cmd/sf.c
@@ -88,6 +88,8 @@ static int do_spi_flash_probe(int argc, char * const argv[])
 #ifdef CONFIG_DM_SPI_FLASH
 	struct udevice *new, *bus_dev;
 	int ret;
+	/* In DM mode defaults will be taken from DT */
+	speed = 0, mode = 0;
 #else
 	struct spi_flash *new;
 #endif
diff --git a/common/env_sf.c b/common/env_sf.c
index 273098ceb605..c53200f5c6fe 100644
--- a/common/env_sf.c
+++ b/common/env_sf.c
@@ -55,9 +55,9 @@ int saveenv(void)
 #ifdef CONFIG_DM_SPI_FLASH
 	struct udevice *new;
 
+	/* speed and mode will be read from DT */
 	ret = spi_flash_probe_bus_cs(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS,
-				     CONFIG_ENV_SPI_MAX_HZ,
-				     CONFIG_ENV_SPI_MODE, &new);
+				     0, 0, &new);
 	if (ret) {
 		set_default_env("!spi_flash_probe_bus_cs() failed");
 		return 1;
@@ -245,9 +245,9 @@ int saveenv(void)
 #ifdef CONFIG_DM_SPI_FLASH
 	struct udevice *new;
 
+	/* speed and mode will be read from DT */
 	ret = spi_flash_probe_bus_cs(CONFIG_ENV_SPI_BUS, CONFIG_ENV_SPI_CS,
-				     CONFIG_ENV_SPI_MAX_HZ,
-				     CONFIG_ENV_SPI_MODE, &new);
+				     0, 0, &new);
 	if (ret) {
 		set_default_env("!spi_flash_probe_bus_cs() failed");
 		return 1;
diff --git a/drivers/spi/spi-uclass.c b/drivers/spi/spi-uclass.c
index 5561f36762f9..5fb5630e2981 100644
--- a/drivers/spi/spi-uclass.c
+++ b/drivers/spi/spi-uclass.c
@@ -264,6 +264,7 @@ int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
 		       struct udevice **busp, struct spi_slave **devp)
 {
 	struct udevice *bus, *dev;
+	struct dm_spi_slave_platdata *plat;
 	bool created = false;
 	int ret;
 
@@ -280,8 +281,6 @@ int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
 	 * SPI flash chip - we will bind to the correct driver.
 	 */
 	if (ret == -ENODEV && drv_name) {
-		struct dm_spi_slave_platdata *plat;
-
 		debug("%s: Binding new device '%s', busnum=%d, cs=%d, driver=%s\n",
 		      __func__, dev_name, busnum, cs, drv_name);
 		ret = device_bind_driver(bus, drv_name, dev_name, &dev);
@@ -308,6 +307,11 @@ int spi_get_bus_and_cs(int busnum, int cs, int speed, int mode,
 		slave->dev = dev;
 	}
 
+	plat = dev_get_parent_platdata(dev);
+	if (!speed) {
+		speed = plat->max_hz;
+		mode = plat->mode;
+	}
 	ret = spi_set_speed_mode(bus, speed, mode);
 	if (ret)
 		goto err;
-- 
2.8.2