dm: spi: Read default speed and mode values from DT
This patch update the behavior introduced by
commit 96907c0fe50a ("dm: spi: Read default speed and mode values from DT")
In case of DT boot, don't read default speed and mode for SPI from
CONFIG_* but 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.
Remove also use in boards of the value speed=0 (no more supported)
for ENV in SPI by using CONFIG_ENV_SPI_MAX_HZ=0.
DT values will be always used when available (full DM support of
SPI slave with available DT node) even if speed and mode are requested;
for example in splash screen support (in splash_sf_read_raw)
or in SPL boot (in spl_spi_load_image).
The caller of spi_get_bus_and_cs() no more need to force speed=0.
But the current behavior don't change if the SPI slave is not
present (device with generic driver is created automatically)
or if platdata is used (CONFIG_OF_PLATDATA).
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Acked-by: Jagan Teki <jagan@amarulasolutions.com>
diff --git a/drivers/mtd/spi/Kconfig b/drivers/mtd/spi/Kconfig
index 5671bca..d3b007a 100644
--- a/drivers/mtd/spi/Kconfig
+++ b/drivers/mtd/spi/Kconfig
@@ -62,6 +62,9 @@
The default mode may be provided by the platform
to handle the common case when only a single serial
flash is present on the system.
+ Not used for boot with device tree; the SPI driver reads
+ speed and mode from platdata values computed from
+ available node.
config SF_DEFAULT_SPEED
int "SPI Flash default speed in Hz"
@@ -71,6 +74,9 @@
The default speed may be provided by the platform
to handle the common case when only a single serial
flash is present on the system.
+ Not used for boot with device tree; the SPI driver reads
+ speed and mode from platdata values computed from
+ available node.
if SPI_FLASH