github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-08-01 20:22:08 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

arm64: dts: freescale: imx93-phycore-som: Add eMMC no-1-8-v by default

Browse Source 
The phyCORE-i.MX93 SoM comes in two variants, one with VDD_IO set to
3.3V and the other variant to 1.8V. The 3.3V variant can only support
DDR52 mode, while 1.8V variant is capable of HS400ES eMMC mode. The
information about VDD_IO option is encoded in the SoM's EEPROM. EEPROM
is read in the bootloader and bootloader clears the "no-1-8-v" flag in
case of 1.8V SoM variant is detected. Thus add property 'no-1-8-v' by
default to usdhc1 (eMMC) node and let bootloader handle the flag. In
case EEPROM is erased or read-out fails, flag "no-1-8-v" also ensures
fall-back compatibility with both SoM variants.

Signed-off-by: Primoz Fiser <primoz.fiser@norik.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Primoz Fiser 2025-04-22 12:56:34 +02:00 committed by Shawn Guo
parent 54be09bdb1
commit 9ed135ca48
1 changed files with 1 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/arm64/boot/dts/freescale/imx93-phycore-som.dtsi
View File

@ -172,6 +172,7 @@ &usdhc1 {
pinctrl-2 = <&pinctrl_usdhc1_200mhz>;
bus-width = <8>;
non-removable;
no-1-8-v;
status = "okay";
};