[PATCH v2 1/2] arm64: dts: rockchip: Enable the EG25-G modem on the Pinephone Pro

[Rudraksha Gupta via B4 Relay]

From: Martijn Braam <martijn@xxxxxxxxx>

The Quectel EG25-G modem is soldered to the board. It sits on the USB 2.0
host controller behind u2phy1, with uart3 as its AT command port, and
draws from two switched rails: vcc_4g_5v off the RK818 boost, and vcc_4g
off vcc_sys.

Neither rail supplies anything but the modem, which has to stay powered
for the board to work as a phone, so both are always-on.

The modem itself has no binding and no in-kernel driver, so it is not
described here; its control lines are driven from userspace.

Based on work by Martijn Braam, Kamil Trzciński, Ondrej Jirman and Dang
Huynh.

Signed-off-by: Martijn Braam <martijn@xxxxxxxxx>
Signed-off-by: Rudraksha Gupta <guptarud@xxxxxxxxx>
---
 .../boot/dts/rockchip/rk3399-pinephone-pro.dts     | 69 ++++++++++++++++++++++
 1 file changed, 69 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
index 8d26bd9b7500..8d2b6a46b39d 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
+++ b/arch/arm64/boot/dts/rockchip/rk3399-pinephone-pro.dts
@@ -134,6 +134,32 @@ vcca1v8_s3: regulator-vcc1v8-s3 {
 		regulator-boot-on;
 	};
 
+	vcc_4g: regulator-vcc-4g {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpio = <&gpio4 RK_PC7 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&vcc_4g_en>;
+		regulator-name = "vcc_4g";
+		regulator-min-microvolt = <3800000>;
+		regulator-max-microvolt = <3800000>;
+		vin-supply = <&vcc_sys>;
+		regulator-always-on;
+	};
+
+	vcc_4g_5v: regulator-vcc-4g-5v {
+		compatible = "regulator-fixed";
+		enable-active-high;
+		gpio = <&gpio1 RK_PC7 GPIO_ACTIVE_HIGH>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&vcc_4g_5v_en>;
+		regulator-name = "vcc_4g_5v";
+		regulator-min-microvolt = <5000000>;
+		regulator-max-microvolt = <5000000>;
+		vin-supply = <&vcc5v0_sys>;
+		regulator-always-on;
+	};
+
 	vcc1v8_codec: regulator-vcc1v8-codec {
 		compatible = "regulator-fixed";
 		enable-active-high;
@@ -264,6 +290,7 @@ rk818: pmic@1c {
 		system-power-controller;
 		wakeup-source;
 
+		boost-supply = <&vcc_sys>;
 		vcc1-supply = <&vcc_sys>;
 		vcc2-supply = <&vcc_sys>;
 		vcc3-supply = <&vcc_sys>;
@@ -318,6 +345,17 @@ regulator-state-mem {
 				};
 			};
 
+			vcc5v0_sys: DCDC_BOOST {
+				regulator-name = "vcc5v0_sys";
+				regulator-always-on;
+				regulator-boot-on;
+				regulator-min-microvolt = <5000000>;
+				regulator-max-microvolt = <5000000>;
+				regulator-state-mem {
+					regulator-on-in-suspend;
+				};
+			};
+
 			vcca3v0_codec: LDO_REG1 {
 				regulator-name = "vcca3v0_codec";
 				regulator-min-microvolt = <3000000>;
@@ -702,6 +740,16 @@ blue_led_pin: blue-led-pin {
 		};
 	};
 
+	modem {
+		vcc_4g_5v_en: vcc-4g-5v-en-pin {
+			rockchip,pins = <1 RK_PC7 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+
+		vcc_4g_en: vcc-4g-en-pin {
+			rockchip,pins = <4 RK_PC7 RK_FUNC_GPIO &pcfg_pull_none>;
+		};
+	};
+
 	pmic {
 		pmic_int_l: pmic-int-l {
 			rockchip,pins = <1 RK_PC5 RK_FUNC_GPIO &pcfg_pull_up>;
@@ -827,6 +875,15 @@ &tsadc {
 	status = "okay";
 };
 
+&u2phy1 {
+	status = "okay";
+};
+
+&u2phy1_host {
+	phy-supply = <&vcc5v0_sys>;
+	status = "okay";
+};
+
 &uart0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&uart0_xfer &uart0_cts &uart0_rts>;
@@ -852,6 +909,18 @@ &uart2 {
 	status = "okay";
 };
 
+&uart3 {
+	status = "okay";
+};
+
+&usb_host1_ehci {
+	status = "okay";
+};
+
+&usb_host1_ohci {
+	status = "okay";
+};
+
 &vopb {
 	status = "okay";
 	assigned-clocks = <&cru DCLK_VOP0_DIV>, <&cru DCLK_VOP0>,

-- 
2.55.0