arm64: dts: apple: t8103: Add spi3 keyboard node

Enables keyboard and touchpad input on MacBook Air (M1, 2020) and MacBook Pro (13-inch, M1, 2020). Signed-off-by: Janne Grunau <[email protected]>
jannau · Nov 27, 2024 · 3469644 · 3469644
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diff --git a/arch/arm64/boot/dts/apple/t8103-j293.dts b/arch/arm64/boot/dts/apple/t8103-j293.dts
@@ -50,6 +50,27 @@
 	label = "USB-C Left-front";
 };
 
+&spi3 {
+	status = "okay";
+
+	hid-transport@0 {
+		compatible = "apple,spi-hid-transport";
+		reg = <0>;
+		spi-max-frequency = <8000000>;
+		/*
+		 * Apple's ADT specifies 20us CS change delays, and the
+		 * SPI HID interface metadata specifies 45us. Using either
+		 * seems not to be reliable, but adding both works, so
+		 * best guess is they are cumulative.
+		 */
+		spi-cs-setup-delay-ns = <65000>;
+		spi-cs-hold-delay-ns = <65000>;
+		spi-cs-inactive-delay-ns = <250000>;
+		spien-gpios = <&pinctrl_ap 195 0>;
+		interrupts-extended = <&pinctrl_nub 13 IRQ_TYPE_LEVEL_LOW>;
+	};
+};
+
 &i2c2 {
 	status = "okay";
 };

diff --git a/arch/arm64/boot/dts/apple/t8103-j313.dts b/arch/arm64/boot/dts/apple/t8103-j313.dts
@@ -53,3 +53,24 @@
 &typec1 {
 	label = "USB-C Left-front";
 };
+
+&spi3 {
+	status = "okay";
+
+	hid-transport@0 {
+		compatible = "apple,spi-hid-transport";
+		reg = <0>;
+		spi-max-frequency = <8000000>;
+		/*
+		 * Apple's ADT specifies 20us CS change delays, and the
+		 * SPI HID interface metadata specifies 45us. Using either
+		 * seems not to be reliable, but adding both works, so
+		 * best guess is they are cumulative.
+		 */
+		spi-cs-setup-delay-ns = <65000>;
+		spi-cs-hold-delay-ns = <65000>;
+		spi-cs-inactive-delay-ns = <250000>;
+		spien-gpios = <&pinctrl_ap 195 0>;
+		interrupts-extended = <&pinctrl_nub 13 IRQ_TYPE_LEVEL_LOW>;
+	};
+};