[PATCH] arm: mvebu: Set common SPI flash default speed and mode

[Tony Dinh]

CONFIG_SF_DEFAULT_SPEED is used in SPL SPI to configure and probe the
flash device during DM SPI uclass probing process, if the
spi-max-frequency is not available in the DTB. Currently the max
frequency is not available, because of the probing mechanism in SPI
uclass has not been fully updated to DM.

The CONFIG_SF_DEFAULT_SPEED is set to 1Mhz if a board defconfig
does not specify it. This speed is too slow and result in a few
seconds delay while the u-boot image is loaded from flash. Based on a
survey of the device tree specifications for MVEBU boards, a sane default
value should be 10Mhz. The default of 10Mhz enables an almost
instantaneously loading of the u-boot image.

Note that this patch depends on this patch series (has been merged to
u-boot-marvell/next):
https://lists.denx.de/pipermail/u-boot/2023-March/511038.html

Signed-off-by: Tony Dinh <mibodhi at gmail.com>
---

 arch/arm/mach-mvebu/Kconfig | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/mach-mvebu/Kconfig b/arch/arm/mach-mvebu/Kconfig
index cdb1776a66..26a2a08d8a 100644
--- a/arch/arm/mach-mvebu/Kconfig
+++ b/arch/arm/mach-mvebu/Kconfig
@@ -424,6 +424,16 @@ config SECURED_MODE_CSK_INDEX
 	default 0
 	depends on SECURED_MODE_IMAGE
 
+config SF_DEFAULT_SPEED
+	int "Default speed for SPI flash in Hz"
+	default 10000000
+	depends on MVEBU_SPL_BOOT_DEVICE_SPI
+
+config CONFIG_SF_DEFAULT_MODE
+	hex "Default mode for SPI flash"
+	default 0x0
+	depends on MVEBU_SPL_BOOT_DEVICE_SPI
+
 source "board/solidrun/clearfog/Kconfig"
 source "board/kobol/helios4/Kconfig"
 
-- 
2.30.2