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ARM: dts: stm32: Auto-detect DHSOM with uSD level translator

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The uSD level translator on DHSOM and Avenger96 are optional, however it
is possible to auto-detect it. This is done by setting SD CMD line high,
and then testing whether signal level on CK line matches the signal level
on CKIN line. If so, the uSD level translator is present, otherwise it is
not populated.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Patrice Chotard <patrice.chotard@foss.st.com>
Cc: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
This commit is contained in:
Marek Vasut 2021-11-13 03:29:44 +01:00 committed by Patrice Chotard
parent 8e5266eefd
commit 77d043cac6
2 changed files with 8 additions and 0 deletions
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4
arch/arm/dts/stm32mp15xx-dhcom-u-boot.dtsi
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@ -216,6 +216,10 @@
&sdmmc1 {
u-boot,dm-spl;
st,use-ckin;
st,cmd-gpios = <&gpiod 2 0>;
st,ck-gpios = <&gpioc 12 0>;
st,ckin-gpios = <&gpioe 4 0>;
};
&sdmmc1_b4_pins_a {

4
arch/arm/dts/stm32mp15xx-dhcor-avenger96-u-boot.dtsi
View File

@ -32,6 +32,10 @@
&sdmmc1 {
u-boot,dm-spl;
st,use-ckin;
st,cmd-gpios = <&gpiod 2 0>;
st,ck-gpios = <&gpioc 12 0>;
st,ckin-gpios = <&gpioe 4 0>;
};
&sdmmc1_b4_pins_a {