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 <marex@denx.de>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Maxime Coquelin <mcoquelin.stm32@gmail.com>
Cc: Patrice Chotard <patrice.chotard@st.com>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Cc: linux-stm32@st-md-mailman.stormreply.com
To: linux-arm-kernel@lists.infradead.org
Signed-off-by: Alexandre Torgue <alexandre.torgue@foss.st.com>

diff --git a/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi b/arch/arm/boot/dts/stm32mp15xx-dhcom-som.dtsi
index daff5318f301ec0a3dfe7fbd2bb15a97dd0d3a8c..97c6e0cd582c83fa387dbc875f8aeb234f3dba1b 100644 (file)
--- 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>;