From: Ng Tze Yee <tzeyee.ng@altera.com>

The Stratix10 devkit supports a separate eMMC daughter card. The eMMC
daughter card replaces the SDMMC slot that is on the default daughter card
and thus requires a separate board dts file.

Signed-off-by: Ng Tze Yee <tzeyee.ng@altera.com>
---
Changes in v2:
- Introduced socfpga_stratix10_socdk.dtsi for common board settings
- Updated socfpga_stratix10_socdk_emmc.dts to include the new dtsi
- Added fallback compatible string "altr,socfpga-stratix10-socdk" in
  the socfpga_stratix10_socdk_emmc.dts
---
 arch/arm64/boot/dts/altera/Makefile           |   1 +
 .../dts/altera/socfpga_stratix10_socdk.dtsi   | 131 ++++++++++++++++++
 .../altera/socfpga_stratix10_socdk_emmc.dts   |  21 +++
 3 files changed, 153 insertions(+)
 create mode 100644 arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dtsi
 create mode 100644 arch/arm64/boot/dts/altera/socfpga_stratix10_socdk_emmc.dts

diff --git a/arch/arm64/boot/dts/altera/Makefile b/arch/arm64/boot/dts/altera/Makefile
index 1bf0c472f6b4..540bb5ae746b 100644
--- a/arch/arm64/boot/dts/altera/Makefile
+++ b/arch/arm64/boot/dts/altera/Makefile
@@ -1,4 +1,5 @@
 # SPDX-License-Identifier: GPL-2.0-only
 dtb-$(CONFIG_ARCH_INTEL_SOCFPGA) += socfpga_stratix10_socdk.dtb \
+				socfpga_stratix10_socdk_emmc.dtb \
 				socfpga_stratix10_socdk_nand.dtb \
 				socfpga_stratix10_swvp.dtb
diff --git a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dtsi b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dtsi
new file mode 100644
index 000000000000..fd968103dfc4
--- /dev/null
+++ b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dtsi
@@ -0,0 +1,131 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright Altera Corporation (C) 2026. All rights reserved.
+ */
+
+#include "socfpga_stratix10.dtsi"
+
+/ {
+	aliases {
+		serial0 = &uart0;
+		ethernet0 = &gmac0;
+		ethernet1 = &gmac1;
+		ethernet2 = &gmac2;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	leds {
+		compatible = "gpio-leds";
+		led-hps0 {
+			label = "hps_led0";
+			gpios = <&portb 20 GPIO_ACTIVE_HIGH>;
+		};
+
+		led-hps1 {
+			label = "hps_led1";
+			gpios = <&portb 19 GPIO_ACTIVE_HIGH>;
+		};
+
+		led-hps2 {
+			label = "hps_led2";
+			gpios = <&portb 21 GPIO_ACTIVE_HIGH>;
+		};
+	};
+
+	memory@80000000 {
+		device_type = "memory";
+		/* We expect the bootloader to fill in the reg */
+		reg = <0 0x80000000 0 0>;
+	};
+
+	ref_033v: regulator-0v33-ref {
+		compatible = "regulator-fixed";
+		regulator-name = "0.33V";
+		regulator-min-microvolt = <330000>;
+		regulator-max-microvolt = <330000>;
+	};
+};
+
+&gpio1 {
+	status = "okay";
+};
+
+&gmac2 {
+	status = "okay";
+	/* PHY delays is configured via skew properties */
+	phy-mode = "rgmii";
+	phy-handle = <&phy0>;
+
+	max-frame-size = <9000>;
+
+	mdio0 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		compatible = "snps,dwmac-mdio";
+		phy0: ethernet-phy@4 {
+			reg = <4>;
+
+			txd0-skew-ps = <0>; /* -420ps */
+			txd1-skew-ps = <0>; /* -420ps */
+			txd2-skew-ps = <0>; /* -420ps */
+			txd3-skew-ps = <0>; /* -420ps */
+			rxd0-skew-ps = <420>; /* 0ps */
+			rxd1-skew-ps = <420>; /* 0ps */
+			rxd2-skew-ps = <420>; /* 0ps */
+			rxd3-skew-ps = <420>; /* 0ps */
+			txen-skew-ps = <0>; /* -420ps */
+			txc-skew-ps = <900>; /* 0ps */
+			rxdv-skew-ps = <420>; /* 0ps */
+			rxc-skew-ps = <1680>; /* 780ps */
+		};
+	};
+};
+
+&osc1 {
+	clock-frequency = <25000000>;
+};
+
+&uart0 {
+	status = "okay";
+};
+
+&usb0 {
+	status = "okay";
+	disable-over-current;
+};
+
+&watchdog0 {
+	status = "okay";
+};
+
+&i2c2 {
+	status = "okay";
+	clock-frequency = <100000>;
+	i2c-sda-falling-time-ns = <890>;  /* hcnt */
+	i2c-scl-falling-time-ns = <890>;  /* lcnt */
+
+	adc@14 {
+		compatible = "lltc,ltc2497";
+		reg = <0x14>;
+		vref-supply = <&ref_033v>;
+	};
+
+	temp@4c {
+		compatible = "maxim,max1619";
+		reg = <0x4c>;
+	};
+
+	eeprom@51 {
+		compatible = "atmel,24c32";
+		reg = <0x51>;
+		pagesize = <32>;
+	};
+
+	rtc@68 {
+		compatible = "dallas,ds1339";
+		reg = <0x68>;
+	};
+};
diff --git a/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk_emmc.dts b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk_emmc.dts
new file mode 100644
index 000000000000..f15fa39d75b5
--- /dev/null
+++ b/arch/arm64/boot/dts/altera/socfpga_stratix10_socdk_emmc.dts
@@ -0,0 +1,21 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright Altera Corporation (C) 2026. All rights reserved.
+ */
+
+#include "socfpga_stratix10_socdk.dtsi"
+
+/ {
+	model = "SoCFPGA Stratix 10 SoCDK eMMC daughter board";
+	compatible = "altr,socfpga-stratix10-socdk-emmc",
+			"altr,socfpga-stratix10-socdk",
+			"altr,socfpga-stratix10";
+};
+
+&mmc {
+	status = "okay";
+	cap-mmc-highspeed;
+	broken-cd;
+	bus-width = <4>;
+	clk-phase-sd-hs = <0>, <135>;
+};
-- 
2.25.1

On Thu, Jan 22, 2026 at 05:47:43AM -0800, tzeyee.ng@altera.com wrote:
> From: Ng Tze Yee <tzeyee.ng@altera.com>
> 
> The Stratix10 devkit supports a separate eMMC daughter card. The eMMC
> daughter card replaces the SDMMC slot that is on the default daughter card
> and thus requires a separate board dts file.
> 
> Signed-off-by: Ng Tze Yee <tzeyee.ng@altera.com>
> ---
> Changes in v2:
> - Introduced socfpga_stratix10_socdk.dtsi for common board settings
> - Updated socfpga_stratix10_socdk_emmc.dts to include the new dtsi
> - Added fallback compatible string "altr,socfpga-stratix10-socdk" in
>   the socfpga_stratix10_socdk_emmc.dts

You forgot to modify the existing socdk dts to use the common dtsi,
as-is you've just moved the duplication to a different file.

> ---
>  arch/arm64/boot/dts/altera/Makefile           |   1 +
>  .../dts/altera/socfpga_stratix10_socdk.dtsi   | 131 ++++++++++++++++++
>  .../altera/socfpga_stratix10_socdk_emmc.dts   |  21 +++
>  3 files changed, 153 insertions(+)
>  create mode 100644 arch/arm64/boot/dts/altera/socfpga_stratix10_socdk.dtsi
>  create mode 100644 arch/arm64/boot/dts/altera/socfpga_stratix10_socdk_emmc.dts