ARM: dts: am437x-gp: Add dcan support

Add DCAN support for AM437x GP EVM with both DCAN instances.

[Roger Q] Updated output pin to not use pull up.
Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: George Cherian <george.cherian@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am437x-gp-evm.dts

@@ -254,6 +254,20 @@ lcd_pins: lcd_pins {
 			0x238 (PIN_OUTPUT_PULLUP | MUX_MODE7)
 		>;
 	};
+
+	dcan0_default: dcan0_default_pins {
+		pinctrl-single,pins = <
+			0x178 (PIN_OUTPUT | MUX_MODE2)		/* uart1_ctsn.d_can0_tx */
+			0x17c (PIN_INPUT_PULLUP | MUX_MODE2)	/* uart1_rtsn.d_can0_rx */
+		>;
+	};
+
+	dcan1_default: dcan1_default_pins {
+		pinctrl-single,pins = <
+			0x180 (PIN_OUTPUT | MUX_MODE2)		/* uart1_rxd.d_can1_tx */
+			0x184 (PIN_INPUT_PULLUP | MUX_MODE2)	/* uart1_txd.d_can1_rx */
+		>;
+	};
 };
 
 &i2c0 {
@@ -519,3 +533,15 @@ dpi_out: endpoint@0 {
 		};
 	};
 };
+
+&dcan0 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&dcan0_default>;
+	status = "okay";
+};
+
+&dcan1 {
+	pinctrl-names = "default";
+	pinctrl-0 = <&dcan1_default>;
+	status = "okay";
+};