arm64: dts: renesas: Add CN15 eMMC and SD overlays for RZ/V2H and RZ/V2N EVKs

Introduce device tree overlays for supporting the eMMC (RTK0EF0186B02000BJ)
and microSD (RTK0EF0186B01000BJ) sub-boards connected via the CN15
connector on the RZ/V2H and RZ/V2N evaluation kits.

These overlays enable SDHI0 with appropriate pin control settings, power
regulators, and GPIO handling. Both sub-boards are supported using shared
overlay files that can be applied to either EVK due to their identical
connector layout and interface support.

To support this, new DT overlay files are added:
- `rzv2-evk-cn15-emmc.dtso` for eMMC
- `rzv2-evk-cn15-sd.dtso` for microSD

Additionally, the base DTS files for both EVKs are updated to include a
fixed 1.8V regulator (`reg_1p8v`) needed by the eMMC sub-board and
potential future use cases such as HDMI output.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250627193742.110818-1-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

5 files changed, 149 insertions, 0 deletions

diff --git a/arch/arm64/boot/dts/renesas/Makefile b/arch/arm64/boot/dts/renesas/Makefile
index cbd0202c4a17..ab2ab3ffd693 100644
--- a/arch/arm64/boot/dts/renesas/Makefile
+++ b/arch/arm64/boot/dts/renesas/Makefile
@@ -163,8 +163,20 @@ r9a09g047e57-smarc-cru-csi-ov5645-dtbs := r9a09g047e57-smarc.dtb r9a09g047e57-sm
 dtb-$(CONFIG_ARCH_R9A09G047) += r9a09g047e57-smarc-cru-csi-ov5645.dtb
 
 dtb-$(CONFIG_ARCH_R9A09G056) += r9a09g056n48-rzv2n-evk.dtb
+dtb-$(CONFIG_ARCH_R9A09G056) += rzv2-evk-cn15-emmc.dtbo
+r9a09g056n48-rzv2n-evk-cn15-emmc-dtbs := r9a09g056n48-rzv2n-evk.dtb rzv2-evk-cn15-emmc.dtbo
+dtb-$(CONFIG_ARCH_R9A09G056) += r9a09g056n48-rzv2n-evk-cn15-emmc.dtb
+dtb-$(CONFIG_ARCH_R9A09G056) += rzv2-evk-cn15-sd.dtbo
+r9a09g056n48-rzv2n-evk-cn15-sd-dtbs := r9a09g056n48-rzv2n-evk.dtb rzv2-evk-cn15-sd.dtbo
+dtb-$(CONFIG_ARCH_R9A09G056) += r9a09g056n48-rzv2n-evk-cn15-sd.dtb
 
 dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h44-rzv2h-evk.dtb
+dtb-$(CONFIG_ARCH_R9A09G057) += rzv2-evk-cn15-emmc.dtbo
+r9a09g057h44-rzv2h-evk-cn15-emmc-dtbs := r9a09g057h44-rzv2h-evk.dtb rzv2-evk-cn15-emmc.dtbo
+dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h44-rzv2h-evk-cn15-emmc.dtb
+dtb-$(CONFIG_ARCH_R9A09G057) += rzv2-evk-cn15-sd.dtbo
+r9a09g057h44-rzv2h-evk-cn15-sd-dtbs := r9a09g057h44-rzv2h-evk.dtb rzv2-evk-cn15-sd.dtbo
+dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h44-rzv2h-evk-cn15-sd.dtb
 dtb-$(CONFIG_ARCH_R9A09G057) += r9a09g057h48-kakip.dtb
 
 dtb-$(CONFIG_ARCH_RCAR_GEN3) += draak-ebisu-panel-aa104xd12.dtbo
diff --git a/arch/arm64/boot/dts/renesas/r9a09g056n48-rzv2n-evk.dts b/arch/arm64/boot/dts/renesas/r9a09g056n48-rzv2n-evk.dts
index 40014044bbc7..5829b9afaa95 100644
--- a/arch/arm64/boot/dts/renesas/r9a09g056n48-rzv2n-evk.dts
+++ b/arch/arm64/boot/dts/renesas/r9a09g056n48-rzv2n-evk.dts
@@ -48,6 +48,15 @@
 		regulator-always-on;
 	};
 
+	reg_1p8v: regulator-1p8v {
+		compatible = "regulator-fixed";
+		regulator-name = "fixed-1.8V";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		regulator-boot-on;
+		regulator-always-on;
+	};
+
 	reg_3p3v: regulator-3p3v {
 		compatible = "regulator-fixed";
 		regulator-name = "fixed-3.3V";
diff --git a/arch/arm64/boot/dts/renesas/r9a09g057h44-rzv2h-evk.dts b/arch/arm64/boot/dts/renesas/r9a09g057h44-rzv2h-evk.dts
index ae021546d895..886ce31c1674 100644
--- a/arch/arm64/boot/dts/renesas/r9a09g057h44-rzv2h-evk.dts
+++ b/arch/arm64/boot/dts/renesas/r9a09g057h44-rzv2h-evk.dts
@@ -55,6 +55,15 @@
 		regulator-always-on;
 	};
 
+	reg_1p8v: regulator-1p8v {
+		compatible = "regulator-fixed";
+		regulator-name = "fixed-1.8V";
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		regulator-boot-on;
+		regulator-always-on;
+	};
+
 	reg_3p3v: regulator-3p3v {
 		compatible = "regulator-fixed";
 
diff --git a/arch/arm64/boot/dts/renesas/rzv2-evk-cn15-emmc.dtso b/arch/arm64/boot/dts/renesas/rzv2-evk-cn15-emmc.dtso
new file mode 100644
index 000000000000..eda2b31f6d79
--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/rzv2-evk-cn15-emmc.dtso
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Shared DT overlay for the eMMC Sub Board (RTK0EF0186B02000BJ), which
+ * is connected to the CN15 connector on the RZ/V2H and RZ/V2N EVKs.
+ *
+ * Copyright (C) 2025 Renesas Electronics Corp.
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/pinctrl/rzg2l-pinctrl.h>
+
+&{/} {
+	aliases {
+		mmc0 = "/soc/mmc@15c00000";
+	};
+};
+
+&pinctrl {
+	sdhi0_emmc_pins: emmc-pins {
+		sd0-clk {
+			pins = "SD0CLK";
+			renesas,output-impedance = <3>;
+			slew-rate = <0>;
+		};
+
+		sd0-dat-cmd {
+			pins = "SD0DAT0", "SD0DAT1", "SD0DAT2", "SD0DAT3", "SD0DAT4",
+			       "SD0DAT5", "SD0DAT6", "SD0DAT7", "SD0CMD";
+			input-enable;
+			renesas,output-impedance = <3>;
+			slew-rate = <0>;
+		};
+	};
+};
+
+&sdhi0 {
+	pinctrl-0 = <&sdhi0_emmc_pins>;
+	pinctrl-1 = <&sdhi0_emmc_pins>;
+	pinctrl-names = "default", "state_uhs";
+	vmmc-supply = <&reg_3p3v>;
+	vqmmc-supply = <&reg_1p8v>;
+	bus-width = <8>;
+	mmc-hs200-1_8v;
+	non-removable;
+	fixed-emmc-driver-type = <1>;
+	status = "okay";
+};
diff --git a/arch/arm64/boot/dts/renesas/rzv2-evk-cn15-sd.dtso b/arch/arm64/boot/dts/renesas/rzv2-evk-cn15-sd.dtso
new file mode 100644
index 000000000000..0af1e0a6c7f4
--- /dev/null
+++ b/arch/arm64/boot/dts/renesas/rzv2-evk-cn15-sd.dtso
@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Shared DT overlay for the microSD Sub Board (RTK0EF0186B01000BJ), which
+ * is connected to the CN15 connector on the RZ/V2H and RZ/V2N EVKs.
+ *
+ * Copyright (C) 2025 Renesas Electronics Corp.
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/pinctrl/rzg2l-pinctrl.h>
+
+&{/} {
+	aliases {
+		mmc0 = "/soc/mmc@15c00000";
+	};
+
+	vqmmc_sdhi0: regulator-vqmmc-sdhi0 {
+		compatible = "regulator-gpio";
+		regulator-name = "SDHI0 VqmmC";
+		gpios = <&pinctrl RZG2L_GPIO(10, 0) GPIO_ACTIVE_HIGH>;
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <3300000>;
+		gpios-states = <0>;
+		states = <3300000 0>, <1800000 1>;
+	};
+};
+
+&pinctrl {
+	sdhi0-pwr-en-hog {
+		gpio-hog;
+		gpios = <RZG2L_GPIO(10, 1) GPIO_ACTIVE_HIGH>;
+		output-high;
+		line-name = "sd0_pwr_en";
+	};
+
+	sdhi0_pins: sd0 {
+		sd0-cd {
+			pinmux = <RZG2L_PORT_PINMUX(10, 5, 15)>; /* SD0_CD */
+		};
+
+		sd0-clk {
+			pins = "SD0CLK";
+			renesas,output-impedance = <3>;
+			slew-rate = <0>;
+		};
+
+		sd0-dat-cmd {
+			pins = "SD0DAT0", "SD0DAT1", "SD0DAT2", "SD0DAT3", "SD0CMD";
+			input-enable;
+			renesas,output-impedance = <3>;
+			slew-rate = <0>;
+		};
+	};
+};
+
+&sdhi0 {
+	pinctrl-0 = <&sdhi0_pins>;
+	pinctrl-1 = <&sdhi0_pins>;
+	pinctrl-names = "default", "state_uhs";
+	vmmc-supply = <&reg_3p3v>;
+	vqmmc-supply = <&vqmmc_sdhi0>;
+	bus-width = <4>;
+	sd-uhs-sdr50;
+	sd-uhs-sdr104;
+	status = "okay";
+};