linux-kernel - [PATCH 1/8] arm64: dts: mediatek: cherry: Enable the System Companion Processor

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Date:   Thu, 21 Jul 2022 15:42:21 +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 1/8] arm64: dts: mediatek: cherry: Enable the System Companion Processor

MT8195 features a SCP like some other older SoCs, and Cherry uses it
for various tasks. Add the required pin configuration and DMA pool
and enable the node.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
---
 .../boot/dts/mediatek/mt8195-cherry.dtsi      | 28 +++++++++++++++++++
 1 file changed, 28 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
index fcc600674339..feebbe367e93 100644
--- a/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8195-cherry.dtsi
@@ -104,6 +104,18 @@ usb_vbus: regulator-5v0-usb-vbus {
 		enable-active-high;
 		regulator-always-on;
 	};
+
+	reserved_memory: reserved-memory {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		ranges;
+
+		scp_mem: memory@...00000 {
+			compatible = "shared-dma-pool";
+			reg = <0 0x50000000 0 0x2900000>;
+			no-map;
+		};
+	};
 };
 
 &i2c0 {
@@ -600,6 +612,14 @@ pins-low-power-pupd {
 		};
 	};
 
+	scp_pins: scp-default-pins {
+		pins-vreq {
+			pinmux = <PINMUX_GPIO76__FUNC_SCP_VREQ_VAO>;
+			bias-disable;
+			input-enable;
+		};
+	};
+
 	spi0_pins: spi0-default-pins {
 		pins-cs-mosi-clk {
 			pinmux = <PINMUX_GPIO132__FUNC_SPIM0_CSB>,
@@ -643,6 +663,14 @@ &pmic {
 	interrupts-extended = <&pio 222 IRQ_TYPE_LEVEL_HIGH>;
 };
 
+&scp {
+	status = "okay";
+
+	memory-region = <&scp_mem>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&scp_pins>;
+};
+
 &spi0 {
 	status = "okay";
 
-- 
2.35.1