arm64: dts: rockchip: add DTs for Sakura Pi RK3308B

The Sakura Pi RK3308B is a SBC based on the Rockchip RK3308 SoC.

Link: https://github.com/Sakura-Pi
Link: https://docs.sakurapi.org/article/sakurapi-rk3308b/introduce

The device contains the following hardware that is tested/working:
 - 4 or 8GB eMMC
 - SDMMC card slot
 - Realtek SDIO WiFi 5/BT
 - 256 or 512MB of RAM
 - USB 2.0 port
 - OTG port

Signed-off-by: Hsun Lai <i@chainsx.cn>
Link: https://lore.kernel.org/r/20250521131108.5710-4-i@chainsx.cn
Signed-off-by: Heiko Stuebner <heiko@sntech.de>

2 files changed, 266 insertions, 0 deletions

diff --git a/arch/arm64/boot/dts/rockchip/Makefile b/arch/arm64/boot/dts/rockchip/Makefile
index 1321f54da28a..61f1dfcd1669 100644
--- a/arch/arm64/boot/dts/rockchip/Makefile
+++ b/arch/arm64/boot/dts/rockchip/Makefile
@@ -18,6 +18,7 @@ dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3308-evb.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3308-roc-cc.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3308-rock-pi-s.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3308-rock-s0.dtb
+dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3308-sakurapi-rk3308b.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3318-a95x-z2.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3326-anbernic-rg351m.dtb
 dtb-$(CONFIG_ARCH_ROCKCHIP) += rk3326-anbernic-rg351v.dtb
diff --git a/arch/arm64/boot/dts/rockchip/rk3308-sakurapi-rk3308b.dts b/arch/arm64/boot/dts/rockchip/rk3308-sakurapi-rk3308b.dts
new file mode 100644
index 000000000000..f9f633aebb64
--- /dev/null
+++ b/arch/arm64/boot/dts/rockchip/rk3308-sakurapi-rk3308b.dts
@@ -0,0 +1,265 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+/*
+ * Copyright (c) 2019 Akash Gajjar <akash@openedev.com>
+ * Copyright (c) 2019 Jagan Teki <jagan@openedev.com>
+ * Copyright (C) 2024 TheSnowfield <thesnowfield@sakurapi.org>
+ * Copyright (C) 2025 Hsun Lai <i@chainsx.cn>
+ */
+
+/dts-v1/;
+#include "rk3308.dtsi"
+#include <dt-bindings/leds/common.h>
+
+/ {
+	model = "Sakura Pi RK3308B";
+	compatible = "sakurapi,rk3308-sakurapi-rk3308b", "rockchip,rk3308";
+
+	aliases {
+		mmc0 = &emmc;
+		mmc1 = &sdmmc;
+		mmc2 = &sdio;
+	};
+
+	chosen {
+		stdout-path = "serial2:1500000n8";
+	};
+
+	vcc5v0_sys: regulator-vcc5v0-sys {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc5v0_sys";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+	};
+
+	vdd_core: regulator-vdd-core {
+		compatible = "pwm-regulator";
+		pwms = <&pwm0 0 5000 1>;
+		regulator-name = "vdd_core";
+		regulator-min-microvolt = <827000>;
+		regulator-max-microvolt = <1340000>;
+		regulator-settling-time-up-us = <250>;
+		regulator-always-on;
+		regulator-boot-on;
+		pwm-supply = <&vcc5v0_sys>;
+	};
+
+	vdd_log: regulator-vdd-log {
+		compatible = "regulator-fixed";
+		regulator-name = "vdd_log";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <1050000>;
+		regulator-max-microvolt = <1050000>;
+		vin-supply = <&vcc5v0_sys>;
+	};
+
+	vcc_ddr: regulator-vcc-ddr {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc_ddr";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <1500000>;
+		regulator-max-microvolt = <1500000>;
+		vin-supply = <&vcc5v0_sys>;
+	};
+
+	vcc_1v8: regulator-vcc-1v8 {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc_1v8";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <1800000>;
+		regulator-max-microvolt = <1800000>;
+		vin-supply = <&vcc_io>;
+	};
+
+	vcc_io: regulator-vcc-io {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc_io";
+		regulator-always-on;
+		regulator-boot-on;
+		regulator-min-microvolt = <3300000>;
+		regulator-max-microvolt = <3300000>;
+		vin-supply = <&vcc5v0_sys>;
+	};
+
+	vcc_phy: regulator-vcc-phy-regulator {
+		compatible = "regulator-fixed";
+		regulator-name = "vcc_phy";
+		regulator-always-on;
+		regulator-boot-on;
+	};
+
+	vcc5v0_otg: regulator-vcc5v0-otg {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpio = <&gpio0 RK_PC5 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&otg_vbus_drv>;
+		regulator-name = "vcc5v0_otg";
+		regulator-always-on;
+		vin-supply = <&vcc5v0_sys>;
+	};
+
+	sdio_pwrseq: sdio-pwrseq {
+		compatible = "mmc-pwrseq-simple";
+		pinctrl-0 = <&wifi_enable_h>;
+		pinctrl-names = "default";
+		/*
+		 * On the module itself this is one of these (depending
+		 * on the actual card populated):
+		 * - SDIO_RESET_L_WL_REG_ON
+		 * - PDN (power down when low)
+		 */
+		reset-gpios = <&gpio0 RK_PA2 GPIO_ACTIVE_LOW>;
+	};
+};
+
+&cpu0 {
+	cpu-supply = <&vdd_core>;
+};
+
+&emmc {
+	bus-width = <8>;
+	cap-mmc-highspeed;
+	non-removable;
+	status = "okay";
+};
+
+&i2c1 {
+	status = "okay";
+};
+
+&pinctrl {
+	pinctrl-names = "default";
+	pinctrl-0 = <&rtc_32k>;
+
+	bluetooth {
+		bt_reg_on: bt-reg-on {
+			rockchip,pins = <4 RK_PB3 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+
+		bt_wake_host: bt-wake-host {
+			rockchip,pins = <4 RK_PB4 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+
+		host_wake_bt: host-wake-bt {
+			rockchip,pins = <4 RK_PB2 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
+	sdio-pwrseq {
+		wifi_enable_h: wifi-enable-h {
+			rockchip,pins = <0 RK_PA2 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
+	usb {
+		otg_vbus_drv: otg-vbus-drv {
+			rockchip,pins = <0 RK_PC5 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
+	wifi {
+		wifi_host_wake: wifi-host-wake {
+			rockchip,pins = <0 RK_PA0 RK_FUNC_GPIO &pcfg_pull_down>;
+		};
+	};
+};
+
+&pwm0 {
+	status = "okay";
+	pinctrl-0 = <&pwm0_pin_pull_down>;
+};
+
+&pwm3 {
+	status = "okay";
+};
+
+&saradc {
+	vref-supply = <&vcc_1v8>;
+	status = "okay";
+};
+
+&sdio {
+	#address-cells = <1>;
+	#size-cells = <0>;
+	cap-sd-highspeed;
+	cap-sdio-irq;
+	keep-power-in-suspend;
+	mmc-pwrseq = <&sdio_pwrseq>;
+	non-removable;
+	no-mmc;
+	no-sd;
+	status = "okay";
+
+	brcmf: wifi@1 {
+		compatible = "brcm,bcm43455-fmac", "brcm,bcm4329-fmac";
+		reg = <1>;
+		interrupt-parent = <&gpio0>;
+		interrupts = <RK_PA3 GPIO_ACTIVE_HIGH>;
+		interrupt-names = "host-wake";
+		pinctrl-names = "default";
+		pinctrl-0 = <&wifi_host_wake>;
+	};
+};
+
+&sdmmc {
+	cap-mmc-highspeed;
+	cap-sd-highspeed;
+	disable-wp;
+	pinctrl-0 = <&sdmmc_clk &sdmmc_cmd &sdmmc_det &sdmmc_bus4>;
+	card-detect-delay = <800>;
+	status = "okay";
+};
+
+&uart2 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&uart2m0_xfer>;
+	status = "okay";
+};
+
+&uart4 {
+	pinctrl-names = "default";
+	uart-has-rtscts;
+	status = "okay";
+
+	bluetooth {
+		compatible = "brcm,bcm4345c5";
+		clocks = <&cru SCLK_RTC32K>;
+		clock-names = "lpo";
+		pinctrl-names = "default";
+		pinctrl-0 = <&host_wake_bt &bt_wake_host &bt_reg_on>;
+		device-wakeup-gpios = <&gpio4 RK_PB4 GPIO_ACTIVE_HIGH>;
+		host-wakeup-gpios = <&gpio4 RK_PB2 GPIO_ACTIVE_HIGH>;
+		shutdown-gpios = <&gpio4 RK_PB3 GPIO_ACTIVE_HIGH>;
+		max-speed = <1500000>;
+	};
+};
+
+&u2phy {
+	status = "okay";
+};
+
+&u2phy_otg {
+	status = "okay";
+};
+
+&u2phy_host {
+	status = "okay";
+};
+
+&usb20_otg {
+	dr_mode = "peripheral";
+	status = "okay";
+};
+
+&usb_host_ehci {
+	status = "okay";
+};
+
+&usb_host_ohci{
+	status = "okay";
+};