Hi Marek,

From: Marek Vasut marex@denx.de

Sent: mardi 1 décembre 2020 11:29

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: Patrice Chotard patrice.chotard@st.com Cc: Patrick Delaunay patrick.delaunay@st.com

---

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>;

-- 2.29.2

Reviewed-by: Patrick Delaunay patrick.delaunay@foss.st.com

For the serie:  the target is next or it is a bugfix for master / v2021.01 ?

Thanks

Patrick