feat: add mcp2515 for q6a

Signed-off-by: Nascs Fang <[email protected]>
Co-authored-by: ZHANG Yuntian <[email protected]>

Author: nascs

arch/arm64/boot/dts/qcom/overlays/Makefile

@@ -16,6 +16,7 @@ dtb-$(CONFIG_ARCH_QCOM) += qcs6490-radxa-dragon-q6a-cam1-imx577.dtbo \
 	qcs6490-radxa-dragon-q6a-spi12-waveshare35b.dtbo \
 	qcs6490-radxa-dragon-q6a-spi6-cs0-spidev.dtbo \
 	qcs6490-radxa-dragon-q6a-spi7-cs0-spidev.dtbo \
+	qcs6490-radxa-dragon-q6a-spi12-cs0-mcp2515-8mhz.dtbo \
 	qcs6490-radxa-dragon-q6a-spi12-cs0-spidev.dtbo \
 	qcs6490-radxa-dragon-q6a-spi14-cs0-spidev.dtbo \
 	qcs6490-radxa-dragon-q6a-uart6-flowctl.dtbo \

arch/arm64/boot/dts/qcom/overlays/qcs6490-radxa-dragon-q6a-spi12-cs0-mcp2515-8mhz.dtso

@@ -0,0 +1,62 @@
+// SPDX-License-Identifier: BSD-3-Clause
+/*
+ * Copyright (c) 2025 Radxa Computer (Shenzhen) Co., Ltd.
+ */
+
+/dts-v1/;
+/plugin/;
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+/ {
+	metadata {
+		title = "Enable MCP2515 with 8MHz external clock on SPI12 over CS0";
+		compatible = "radxa,dragon-q6a";
+		category = "misc";
+		exclusive = "spi12", "uart12", "i2c12", "gpio48", "gpio49", "gpio50", "gpio51", "GPIO_57";
+		description = "Enable MCP2515 with 8MHz external clock on SPI12 over CS0.
+
+Provide support for Microchip MCP2515 SPI CAN controller.
+Assumes 8MHz external clock.
+Uses Pin 22 (GPIO_57) for INT.";
+	};
+};
+
+&i2c12 {
+	status = "disabled";
+};
+
+&uart12 {
+	status = "disabled";
+};
+
+&spi12 {
+	qcom,enable-gsi-dma;
+	status = "okay";
+	max-freq = <1000000>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	can0: mcp2515@0 {
+		compatible = "microchip,mcp2515";
+		status = "okay";
+		reg = <0>;
+		spi-max-frequency = <1000000>;
+
+		interrupt-parent = <&tlmm>;
+		interrupts = <57 IRQ_TYPE_EDGE_FALLING>;
+
+		clocks = <&can0_osc>;
+		vdd-supply = <&vcc_3v3>;
+		xceiver-supply = <&vcc_3v3>;
+	};
+};
+
+&{/} {
+	can0_osc: can0-osc {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency  = <8000000>;
+	};
+};