[PATCH RFC v3 2/2] arm64: dts: qcom: Add a minimal REDMI K90 Ultra description

[Zhang Jiaxi]

From: Jiaxi Zhang <z1529105815@xxxxxxxxxxx>

Add the REDMI K90 Ultra (Xiaomi internal codename Warsaw) board identity,
reference clocks, PM8550/PMK8550 devices, keys, debug UART and USB2
peripheral connection. Build from the SoC and common PMIC includes.

Reuse pmih0108.dtsi on SM8750 SPMI bus 0 instead of duplicating PMIH0108.
Keep the board-specific repeater supplies and tuning values. Preserve the
OEM firmware GPIO reservations without assigning an unverified function
to GPIOs 48-51.

The OEM configuration retains OTG and UCSI role switching. This RFC
provisionally restricts USB to the validated high-speed gadget path; the
connector, role-control and VBUS path still require board integration and
review. This does not establish a peripheral-only port or rule out DP.
Usable RAM and firmware reservations remain a bootloader contract.

Signed-off-by: Jiaxi Zhang <z1529105815@xxxxxxxxxxx>
---
 arch/arm64/boot/dts/qcom/Makefile                 |   1 +
 arch/arm64/boot/dts/qcom/sm8750-xiaomi-warsaw.dts | 246 ++++++++++++++++++++++
 2 files changed, 247 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/Makefile b/arch/arm64/boot/dts/qcom/Makefile
index 1c86e7e98..23ac53888 100644
--- a/arch/arm64/boot/dts/qcom/Makefile
+++ b/arch/arm64/boot/dts/qcom/Makefile
@@ -408,6 +408,7 @@ dtb-$(CONFIG_ARCH_QCOM)	+= sm8650-mtp.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sm8650-qrd.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sm8750-mtp.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= sm8750-qrd.dtb
+dtb-$(CONFIG_ARCH_QCOM)	+= sm8750-xiaomi-warsaw.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= talos-evk.dtb
 
 talos-evk-el2-dtbs	:= talos-evk.dtb talos-el2.dtbo
diff --git a/arch/arm64/boot/dts/qcom/sm8750-xiaomi-warsaw.dts b/arch/arm64/boot/dts/qcom/sm8750-xiaomi-warsaw.dts
new file mode 100644
index 000000000..f8ce5a357
--- /dev/null
+++ b/arch/arm64/boot/dts/qcom/sm8750-xiaomi-warsaw.dts
@@ -0,0 +1,246 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) 2024 Qualcomm Innovation Center, Inc. All rights reserved.
+ * Copyright (c) 2026 Jiaxi Zhang <z1529105815@xxxxxxxxxxx>
+ */
+
+/dts-v1/;
+
+#include <dt-bindings/clock/qcom,rpmh.h>
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include <dt-bindings/regulator/qcom,rpmh-regulator.h>
+#include "sm8750.dtsi"
+#include "pm8550.dtsi"
+#include "pmih0108.dtsi"
+#include "pmk8550.dtsi"
+
+/ {
+	model = "REDMI K90 Ultra";
+	compatible = "xiaomi,warsaw", "qcom,sm8750";
+	chassis-type = "handset";
+
+	aliases {
+		serial0 = &uart7;
+	};
+
+	chosen {
+		stdout-path = "serial0:115200n8";
+	};
+
+	clocks {
+		bi_tcxo_ao_div2: bi-tcxo-ao-div2-clk {
+			compatible = "fixed-factor-clock";
+			#clock-cells = <0>;
+
+			clocks = <&rpmhcc RPMH_CXO_CLK_A>;
+			clock-mult = <1>;
+			clock-div = <2>;
+		};
+
+		bi_tcxo_div2: bi-tcxo-div2-clk {
+			compatible = "fixed-factor-clock";
+			#clock-cells = <0>;
+
+			clocks = <&rpmhcc RPMH_CXO_CLK>;
+			clock-mult = <1>;
+			clock-div = <2>;
+		};
+
+		sleep_clk: sleep-clk {
+			compatible = "fixed-clock";
+			clock-frequency = <32000>;
+			#clock-cells = <0>;
+		};
+
+		xo_board: xo-board {
+			compatible = "fixed-clock";
+			clock-frequency = <76800000>;
+			#clock-cells = <0>;
+		};
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+
+		pinctrl-0 = <&volume_up_n>;
+		pinctrl-names = "default";
+
+		key-volume-up {
+			label = "Volume Up";
+			linux,code = <KEY_VOLUMEUP>;
+			gpios = <&pm8550_gpios 6 GPIO_ACTIVE_LOW>;
+			debounce-interval = <15>;
+			linux,can-disable;
+			wakeup-source;
+		};
+	};
+
+	vph_pwr: regulator-3v7 {
+		compatible = "regulator-fixed";
+		regulator-name = "vph_pwr";
+		regulator-min-microvolt = <3700000>;
+		regulator-max-microvolt = <3700000>;
+		regulator-always-on;
+		regulator-boot-on;
+	};
+};
+
+&apps_rsc {
+	regulators-0 {
+		compatible = "qcom,pm8550-rpmh-regulators";
+		qcom,pmic-id = "b";
+		vdd-bob1-supply = <&vph_pwr>;
+		vdd-l5-l16-supply = <&vreg_bob1>;
+		vdd-l15-supply = <&vreg_s3g_1p8>;
+
+		vreg_bob1: bob1 {
+			regulator-name = "vreg_bob1";
+			regulator-min-microvolt = <3008000>;
+			regulator-max-microvolt = <4000000>;
+			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+		};
+
+		vreg_l5b_3p1: ldo5 {
+			regulator-name = "vreg_l5b_3p1";
+			regulator-min-microvolt = <3100000>;
+			regulator-max-microvolt = <3148000>;
+			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+			regulator-allow-set-load;
+			regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM RPMH_REGULATOR_MODE_HPM>;
+		};
+
+		vreg_l15b_1p8: ldo15 {
+			regulator-name = "vreg_l15b_1p8";
+			regulator-min-microvolt = <1800000>;
+			regulator-max-microvolt = <1800000>;
+			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+			regulator-allow-set-load;
+			regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM RPMH_REGULATOR_MODE_HPM>;
+		};
+	};
+
+	regulators-1 {
+		compatible = "qcom,pm8550ve-rpmh-regulators";
+		qcom,pmic-id = "d";
+		vdd-s1-supply = <&vph_pwr>;
+		vdd-l2-supply = <&vreg_s1d_0p97>;
+
+		vreg_s1d_0p97: smps1 {
+			regulator-name = "vreg_s1d_0p97";
+			regulator-min-microvolt = <880000>;
+			regulator-max-microvolt = <1100000>;
+			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+		};
+
+		vreg_l2d_0p88: ldo2 {
+			regulator-name = "vreg_l2d_0p88";
+			regulator-min-microvolt = <880000>;
+			regulator-max-microvolt = <912000>;
+			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+			regulator-allow-set-load;
+			regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM RPMH_REGULATOR_MODE_HPM>;
+		};
+	};
+
+	regulators-2 {
+		compatible = "qcom,pm8550ve-rpmh-regulators";
+		qcom,pmic-id = "g";
+		vdd-s3-supply = <&vph_pwr>;
+		vdd-l3-supply = <&vreg_s7i_1p2>;
+
+		vreg_s3g_1p8: smps3 {
+			regulator-name = "vreg_s3g_1p8";
+			regulator-min-microvolt = <1856000>;
+			regulator-max-microvolt = <2000000>;
+			regulator-initial-mode = <RPMH_REGULATOR_MODE_LPM>;
+			regulator-allow-set-load;
+			regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM RPMH_REGULATOR_MODE_HPM>;
+		};
+
+		vreg_l3g_1p2: ldo3 {
+			regulator-name = "vreg_l3g_1p2";
+			regulator-min-microvolt = <1200000>;
+			regulator-max-microvolt = <1256000>;
+			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+			regulator-allow-set-load;
+			regulator-allowed-modes = <RPMH_REGULATOR_MODE_LPM RPMH_REGULATOR_MODE_HPM>;
+		};
+	};
+
+	regulators-3 {
+		compatible = "qcom,pm8550ve-rpmh-regulators";
+		qcom,pmic-id = "i";
+		vdd-s7-supply = <&vph_pwr>;
+
+		vreg_s7i_1p2: smps7 {
+			regulator-name = "vreg_s7i_1p2";
+			regulator-min-microvolt = <1224000>;
+			regulator-max-microvolt = <1340000>;
+			regulator-initial-mode = <RPMH_REGULATOR_MODE_HPM>;
+		};
+	};
+};
+
+&pm8550_gpios {
+	volume_up_n: volume-up-n-state {
+		pins = "gpio6";
+		function = "normal";
+		bias-pull-up;
+		input-enable;
+		power-source = <1>;
+	};
+};
+
+&pmih0108_eusb2_repeater {
+	vdd18-supply = <&vreg_l15b_1p8>;
+	vdd3-supply = <&vreg_l5b_3p1>;
+
+	qcom,tune-usb2-preem = /bits/ 8 <3>;
+	qcom,tune-usb2-amplitude = /bits/ 8 <10>;
+	qcom,squelch-detector-bp = <(-2000)>;
+};
+
+&pon_pwrkey {
+	status = "okay";
+};
+
+&pon_resin {
+	linux,code = <KEY_VOLUMEDOWN>;
+
+	status = "okay";
+};
+
+&qupv3_1 {
+	status = "okay";
+};
+
+&tlmm {
+	/*
+	 * The OEM tree reserves these pins. GPIOs 36-39 and 74 serve NFC
+	 * eSE on SM8750 reference boards; the use of 48-51 is not yet known.
+	 */
+	gpio-reserved-ranges = <36 4>, <48 4>, <74 1>;
+};
+
+&uart7 {
+	status = "okay";
+};
+
+&usb {
+	phys = <&usb_hsphy>;
+	phy-names = "usb2-phy";
+	dr_mode = "peripheral";
+	maximum-speed = "high-speed";
+	qcom,select-utmi-as-pipe-clk;
+
+	status = "okay";
+};
+
+&usb_hsphy {
+	vdd-supply = <&vreg_l2d_0p88>;
+	vdda12-supply = <&vreg_l3g_1p2>;
+	phys = <&pmih0108_eusb2_repeater>;
+
+	status = "okay";
+};

-- 
2.55.0