arm64: dts: qcom: ipq5332: add support for the RDP474 variant

Add the initial device tree support for the Reference Design
Platform(RDP) 474 based on IPQ5332 family of SoC. This patch carries
the support for Console UART, eMMC, I2C and GPIO based buttons.
Signed-off-by: Kathiravan T <quic_kathirav@quicinc.com>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230605080531.3879-5-quic_kathirav@quicinc.com

arch/arm64/boot/dts/qcom/Makefile

@@ -7,6 +7,7 @@ dtb-$(CONFIG_ARCH_QCOM)	+= apq8096-ifc6640.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= ipq5332-mi01.2.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= ipq5332-rdp442.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= ipq5332-rdp468.dtb
+dtb-$(CONFIG_ARCH_QCOM)	+= ipq5332-rdp474.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= ipq6018-cp01-c1.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= ipq8074-hk01.dtb
 dtb-$(CONFIG_ARCH_QCOM)	+= ipq8074-hk10-c1.dtb

arch/arm64/boot/dts/qcom/ipq5332-rdp474.dts

+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * IPQ5332 RDP474 board device tree source
+ *
+ * Copyright (c) 2022-2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+/dts-v1/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+#include "ipq5332.dtsi"
+
+/ {
+	model = "Qualcomm Technologies, Inc. IPQ5332 MI01.9";
+	compatible = "qcom,ipq5332-ap-mi01.9", "qcom,ipq5332";
+
+	aliases {
+		serial0 = &blsp1_uart0;
+	};
+
+	chosen {
+		stdout-path = "serial0";
+	};
+
+	gpio-keys {
+		compatible = "gpio-keys";
+		pinctrl-0 = <&gpio_keys_default_state>;
+		pinctrl-names = "default";
+
+		button-wps {
+			label = "wps";
+			linux,code = <KEY_WPS_BUTTON>;
+			gpios = <&tlmm 35 GPIO_ACTIVE_LOW>;
+			linux,input-type = <1>;
+			debounce-interval = <60>;
+		};
+	};
+};
+
+&blsp1_uart0 {
+	pinctrl-0 = <&serial_0_pins>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&blsp1_i2c1 {
+	clock-frequency  = <400000>;
+	pinctrl-0 = <&i2c_1_pins>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&sdhc {
+	bus-width = <4>;
+	max-frequency = <192000000>;
+	mmc-ddr-1_8v;
+	mmc-hs200-1_8v;
+	non-removable;
+	pinctrl-0 = <&sdc_default_state>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+
+&sleep_clk {
+	clock-frequency = <32000>;
+};
+
+&xo_board {
+	clock-frequency = <24000000>;
+};
+
+/* PINCTRL */
+
+&tlmm {
+	gpio_keys_default_state: gpio-keys-default-state {
+		pins = "gpio35";
+		function = "gpio";
+		drive-strength = <8>;
+		bias-pull-up;
+	};
+
+	i2c_1_pins: i2c-1-state {
+		pins = "gpio29", "gpio30";
+		function = "blsp1_i2c0";
+		drive-strength = <8>;
+		bias-pull-up;
+	};
+
+	sdc_default_state: sdc-default-state {
+		clk-pins {
+			pins = "gpio13";
+			function = "sdc_clk";
+			drive-strength = <8>;
+			bias-disable;
+		};
+
+		cmd-pins {
+			pins = "gpio12";
+			function = "sdc_cmd";
+			drive-strength = <8>;
+			bias-pull-up;
+		};
+
+		data-pins {
+			pins = "gpio8", "gpio9", "gpio10", "gpio11";
+			function = "sdc_data";
+			drive-strength = <8>;
+			bias-pull-up;
+		};
+	};
+};