linux-kernel - [PATCH v2 2/8] arm64: dts: mediatek: cherry: Wire up the ChromeOS EC and GSC

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Date:   Thu, 21 Jul 2022 16:50:11 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     matthias.bgg@...il.com
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
Subject: [PATCH v2 2/8] arm64: dts: mediatek: cherry: Wire up the ChromeOS EC and GSC

Wire up the ChromeOS Embedded Controller on SPI0 and its communication
channel via SCP RPMSG along with all of the offered functionality,
including Keyboard, Smart Battery Metrics (SBS), PWM controller, I2C
tunnel, regulators and Type-C connector management.

While at it, also add support for the Cr50 Google Security Chip (GSC)
found on this platform on I2C3 to support TPM and also use it as an
entropy source for the kernel.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 .../boot/dts/mediatek/mt8195-cherry.dtsi      | 93 +++++++++++++++++++
 1 file changed, 93 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
index feebbe367e93..87ac2b4f9814 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
@@ -149,6 +149,14 @@ &i2c3 {
 	clock-frequency = <400000>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&i2c3_pins>;
+
+	cr50@50 {
+		compatible = "google,cr50";
+		reg = <0x50>;
+		interrupts-extended = <&pio 88 IRQ_TYPE_EDGE_FALLING>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&cr50_int>;
+	};
 };
 
 &i2c4 {
@@ -426,6 +434,21 @@ &pio {
 		"AP_SPI_FLASH_MOSI",
 		"AP_SPI_FLASH_MISO";
 
+	cr50_int: cr50-irq-default-pins {
+		pins-gsc-ap-int-odl {
+			pinmux = <PINMUX_GPIO88__FUNC_GPIO88>;
+			input-enable;
+		};
+	};
+
+	cros_ec_int: cros-ec-irq-default-pins {
+		pins-ec-ap-int-odl {
+			pinmux = <PINMUX_GPIO4__FUNC_GPIO4>;
+			bias-pull-up = <MTK_PUPD_SET_R1R0_01>;
+			input-enable;
+		};
+	};
+
 	i2c0_pins: i2c0-default-pins {
 		pins-bus {
 			pinmux = <PINMUX_GPIO8__FUNC_SDA0>,
@@ -669,6 +692,11 @@ &scp {
 	memory-region = <&scp_mem>;
 	pinctrl-names = "default";
 	pinctrl-0 = <&scp_pins>;
+
+	cros-ec-rpmsg {
+		compatible = "google,cros-ec-rpmsg";
+		mediatek,rpmsg-name = "cros-ec-rpmsg";
+	};
 };
 
 &spi0 {
@@ -677,6 +705,68 @@ &spi0 {
 	pinctrl-names = "default";
 	pinctrl-0 = <&spi0_pins>;
 	mediatek,pad-select = <0>;
+
+	cros_ec: ec@0 {
+		#address-cells = <1>;
+		#size-cells = <0>;
+
+		compatible = "google,cros-ec-spi";
+		reg = <0>;
+		interrupts-extended = <&pio 4 IRQ_TYPE_LEVEL_LOW>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&cros_ec_int>;
+		spi-max-frequency = <3000000>;
+
+		cros_ec_pwm: ec-pwm {
+			compatible = "google,cros-ec-pwm";
+			#pwm-cells = <1>;
+		};
+
+		i2c_tunnel: i2c-tunnel {
+			compatible = "google,cros-ec-i2c-tunnel";
+			google,remote-bus = <0>;
+			#address-cells = <1>;
+			#size-cells = <0>;
+		};
+
+		mt_pmic_vmc_ldo_reg: regulator@0 {
+			compatible = "google,cros-ec-regulator";
+			reg = <0>;
+			regulator-name = "mt_pmic_vmc_ldo";
+			regulator-min-microvolt = <1200000>;
+			regulator-max-microvolt = <3600000>;
+		};
+
+		mt_pmic_vmch_ldo_reg: regulator@1 {
+			compatible = "google,cros-ec-regulator";
+			reg = <1>;
+			regulator-name = "mt_pmic_vmch_ldo";
+			regulator-min-microvolt = <2700000>;
+			regulator-max-microvolt = <3600000>;
+		};
+
+		typec {
+			compatible = "google,cros-ec-typec";
+			#address-cells = <1>;
+			#size-cells = <0>;
+
+			usb_c0: connector@0 {
+				compatible = "usb-c-connector";
+				reg = <0>;
+				power-role = "dual";
+				data-role = "host";
+				try-power-role = "source";
+			};
+
+			usb_c1: connector@1 {
+				compatible = "usb-c-connector";
+				reg = <1>;
+				power-role = "dual";
+				data-role = "host";
+				try-power-role = "source";
+			};
+		};
+	};
 };
 
 &u3phy0 {
@@ -728,3 +818,6 @@ &xhci3 {
 	vusb33-supply = <&mt6359_vusb_ldo_reg>;
 	vbus-supply = <&usb_vbus>;
 };
+
+#include <arm/cros-ec-keyboard.dtsi>
+#include <arm/cros-ec-sbs.dtsi>
-- 
2.35.1