[PATCH v2 06/15] arm64: dts: freescale: imx8mn-var-som: Add MCP251xFD CAN controller

[Stefano Radaelli <stefano.radaelli21@gmail.com>]

From: Stefano Radaelli <stefano.r@variscite.com>

Add support for the Microchip MCP251xFD CAN-FD controller connected
to the SPI bus on the i.MX8MN VAR-SOM.

The controller uses a 40 MHz external oscillator and requires an
interrupt line and a dedicated RX interrupt GPIO.

Add the fixed clock, the MCP251xFD device node with the required
properties, and the corresponding pinctrl configuration.

Signed-off-by: Stefano Radaelli <stefano.r@variscite.com>
---
v1->v2:
 - 

 .../boot/dts/freescale/imx8mn-var-som.dtsi    | 27 +++++++++++++++++++
 1 file changed, 27 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
index e2e04ad2fbb6..ac22dd3e6542 100644
--- a/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mn-var-som.dtsi
@@ -11,6 +11,13 @@ / {
 	model = "Variscite VAR-SOM-MX8MN module";
 	compatible = "variscite,var-som-mx8mn", "fsl,imx8mn";
 
+	clk40m: oscillator {
+		compatible = "fixed-clock";
+		#clock-cells = <0>;
+		clock-frequency = <40000000>;
+		clock-output-names = "can_osc";
+	};
+
 	memory@40000000 {
 		device_type = "memory";
 		reg = <0x0 0x40000000 0 0x40000000>;
@@ -130,6 +137,19 @@ touchscreen@0 {
 		ti,keep-vref-on;
 		wakeup-source;
 	};
+
+	/* CAN controller */
+	can0: can@1 {
+		compatible = "microchip,mcp251xfd";
+		reg = <1>;
+		clocks = <&clk40m>;
+		pinctrl-names = "default";
+		pinctrl-0 = <&pinctrl_can>;
+		interrupt-parent = <&gpio1>;
+		interrupts = <5 IRQ_TYPE_LEVEL_LOW>;
+		spi-max-frequency = <20000000>;
+		microchip,rx-int-gpios = <&gpio2 12 GPIO_ACTIVE_LOW>;
+	};
 };
 
 &fec1 {
@@ -391,6 +411,13 @@ &wdog1 {
 };
 
 &iomuxc {
+	pinctrl_can: cangrp {
+		fsl,pins = <
+			MX8MN_IOMUXC_GPIO1_IO05_GPIO1_IO5		0x1c0
+			MX8MN_IOMUXC_SD2_CD_B_GPIO2_IO12		0x16
+		>;
+	};
+
 	pinctrl_ecspi1: ecspi1grp {
 		fsl,pins = <
 			MX8MN_IOMUXC_ECSPI1_SCLK_ECSPI1_SCLK		0x13
-- 
2.47.3