From 845c6720eca92be09127f7d306349ab31dbf372d Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Tue, 1 Dec 2020 11:29:17 +0100 Subject: [PATCH] ARM: dts: stm32: Enable internal pull-ups for SDMMC1 on DHCOM SoM The default state of SD bus and clock line is logical HI. SD card IO is open-drain and pulls the bus lines LO. Always enable the SD bus pull ups to guarantee this behavior on DHCOM SoM. Note that on SoMs with SD bus voltage level shifter, the pull ups are built into the level shifter, however that has no negative impact. Signed-off-by: Marek Vasut Cc: Patrice Chotard Cc: Patrick Delaunay Reviewed-by: Patrick Delaunay --- arch/arm/dts/stm32mp15xx-dhcom.dtsi | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/arm/dts/stm32mp15xx-dhcom.dtsi b/arch/arm/dts/stm32mp15xx-dhcom.dtsi index f022d8395c..9049245c5b 100644 --- a/arch/arm/dts/stm32mp15xx-dhcom.dtsi +++ b/arch/arm/dts/stm32mp15xx-dhcom.dtsi @@ -339,6 +339,20 @@ status = "okay"; }; +&sdmmc1_b4_pins_a { + /* + * SD bus pull-up resistors: + * - optional on SoMs with SD voltage translator + * - mandatory on SoMs without SD voltage translator + */ + pins1 { + bias-pull-up; + }; + pins2 { + bias-pull-up; + }; +}; + &sdmmc2 { pinctrl-names = "default"; pinctrl-0 = <&sdmmc2_b4_pins_a &sdmmc2_d47_pins_a>;