[PATCH v2 2/2] arm64: dts: st: enable eMMC on stm32mp257f-dk
flat view
COOLING12d
IN LINUX-NEXT
From: Mateusz Nowicki <hidden>
Date: 2026-09-23 11:47:54
Also in:
linux-devicetree, lkml
Subsystem:
arm/stm32 architecture, the rest · Maintainers:
Maxime Coquelin, Alexandre Torgue, Linus Torvalds
Queued in linux-next as 94911ce62b45 on 2026-10-01.
Enable the 8-Gbyte eMMC v5.1 connected to SDMMC2 with an 8-bit bus on the STM32MP257F-DK. VDDIO2 is tied to the 1.8 V rail on this board, so the DDR52 and HS200 modes are used. Use the _b pin groups, the _a groups do not give reliable reads in HS200 mode on this board. Tested in HS200 mode at 100 MHz. Signed-off-by: Mateusz Nowicki <redacted> --- arch/arm64/boot/dts/st/stm32mp257f-dk.dts | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
diff --git a/arch/arm64/boot/dts/st/stm32mp257f-dk.dts b/arch/arm64/boot/dts/st/stm32mp257f-dk.dts
index 8daf3dfd5133..a7ad91d5beed 100644
--- a/arch/arm64/boot/dts/st/stm32mp257f-dk.dts
+++ b/arch/arm64/boot/dts/st/stm32mp257f-dk.dts@@ -21,6 +21,8 @@ / { aliases { ethernet0 = ðernet1; serial0 = &usart2; + mmc0 = &sdmmc1; + mmc1 = &sdmmc2; }; chosen {
@@ -279,6 +281,23 @@ &sdmmc1 { status = "okay"; }; +&sdmmc2 { + pinctrl-names = "default", "opendrain", "sleep"; + pinctrl-0 = <&sdmmc2_b4_pins_b &sdmmc2_d47_pins_b>; + pinctrl-1 = <&sdmmc2_b4_od_pins_b &sdmmc2_d47_pins_b>; + pinctrl-2 = <&sdmmc2_b4_sleep_pins_a &sdmmc2_d47_sleep_pins_a>; + non-removable; + no-sd; + no-sdio; + st,neg-edge; + bus-width = <8>; + mmc-ddr-1_8v; + mmc-hs200-1_8v; + vmmc-supply = <&scmi_vdd_emmc>; + vqmmc-supply = <&scmi_vddio2>; + status = "okay"; +}; + &usart2 { pinctrl-names = "default", "idle", "sleep"; pinctrl-0 = <&usart2_pins_a>;
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2.55.0