From 7cd8567d988a6aad64e56e9afda358c68716d75e Mon Sep 17 00:00:00 2001 From: Marek Vasut Date: Tue, 1 Dec 2020 12:14:40 +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: Alexandre Torgue Cc: Maxime Coquelin Cc: Patrice Chotard Cc: Patrick Delaunay Cc: linux-stm32@st-md-mailman.stormreply.com To: linux-arm-kernel@lists.infradead.org Signed-off-by: Alexandre Torgue --- arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi b/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi index daff5318f301e..97c6e0cd582c8 100644 --- a/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi +++ b/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi @@ -400,6 +400,20 @@ 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", "opendrain", "sleep"; pinctrl-0 = <&sdmmc2_b4_pins_a &sdmmc2_d47_pins_a>; -- 2.30.2