Enable the SDHCI controller for eMMC functionality on the Monaco EVK
using a device tree overlay. Configure the corresponding VCC regulator
parameters to support the eMMC interface.

Additionally, disable the UFS controller node. The VCC regulator is
shared between the UFS and eMMC subsystems; leaving UFS enabled while
operating eMMC results in power leakage on the shared rail.

Signed-off-by: Monish Chunara <monish.chunara@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/Makefile             |  3 ++
 arch/arm64/boot/dts/qcom/monaco-evk-emmc.dtso | 46 +++++++++++++++++++
 2 files changed, 49 insertions(+)
 create mode 100644 arch/arm64/boot/dts/qcom/monaco-evk-emmc.dtso

diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
index c86242a1631d..1660ed89fecb 100644
--- a/arch/arm64/boot/dts/qcom/Makefile
+++ b/arch/arm64/boot/dts/qcom/Makefile
@@ -50,6 +50,9 @@ dtb-$(CONFIG_ARCH_QCOM)	+= monaco-evk.dtb
 monaco-evk-sd-card-dtbs := monaco-evk.dtb monaco-evk-sd-card.dtbo
 dtb-$(CONFIG_ARCH_QCOM) += monaco-evk-sd-card.dtb
 
+monaco-evk-emmc-dtbs := monaco-evk.dtb monaco-evk-emmc.dtbo
+dtb-$(CONFIG_ARCH_QCOM) += monaco-evk-emmc.dtb
+
 dtb-$(CONFIG_ARCH_QCOM)	+= msm8216-samsung-fortuna3g.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-acer-a1-724.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= msm8916-alcatel-idol347.dtb
diff --git a/arch/arm64/boot/dts/qcom/monaco-evk-emmc.dtso b/arch/arm64/boot/dts/qcom/monaco-evk-emmc.dtso
new file mode 100644
index 000000000000..1ced916247c1
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/monaco-evk-emmc.dtso
@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) Qualcomm Technologies, Inc. and/or its subsidiaries.
+ */
+
+/dts-v1/;
+/plugin/;
+
+/ {
+        vreg_s2s: regulator-vreg-s2s {
+                compatible = "regulator-fixed";
+                regulator-name = "regulator-s2s";
+
+                regulator-min-microvolt = <1800000>;
+                regulator-max-microvolt = <1800000>;
+        };
+};
+
+&sdhc_1 {
+	vmmc-supply = <&vreg_l8a>;
+	vqmmc-supply = <&vreg_s2s>;
+
+	supports-cqe;
+
+	pinctrl-0 = <&sdc1_state_on>;
+	pinctrl-1 = <&sdc1_state_off>;
+
+	pinctrl-names = "default", "sleep";
+
+	non-removable;
+
+	bus-width = <8>;
+	no-sd;
+	no-sdio;
+
+	status = "okay";
+};
+
+&ufs_mem_hc {
+	status = "disabled";
+};
+
+&vreg_l8a {
+	regulator-min-microvolt = <2960000>;
+	regulator-max-microvolt = <2960000>;
+};
-- 
2.34.1