arm64: dts: renesas: r9a09g047e57-smarc: Enable CAN Transceiver

Enable TCAN1046V-Q1 CAN Transceiver populated on RZ/G3E SMARC EVK by
modelling it as two instances of tcan1042.

Signed-off-by: Biju Das <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/[email protected]
Signed-off-by: Geert Uytterhoeven <[email protected]>

Author: bijudas

arch/arm64/boot/dts/renesas/r9a09g047e57-smarc.dts

@@ -8,6 +8,8 @@
 /dts-v1/;
 
 /* Switch selection settings */
+#define SW_GPIO8_CAN0_STB	0
+#define SW_GPIO9_CAN1_STB	0
 #define SW_LCD_EN		0
 #define SW_PDM_EN		0
 #define SW_SD0_DEV_SEL		0
@@ -42,16 +44,36 @@
 #if (!SW_PDM_EN)
 	channel1 {
 		status = "okay";
+#if (!SW_LCD_EN) && (SW_GPIO9_CAN1_STB)
+		phys = <&can_transceiver1>;
+#endif
 	};
 #endif
 
 #if (!SW_LCD_EN)
 	channel4 {
 		status = "okay";
+#if (SW_GPIO8_CAN0_STB)
+		phys = <&can_transceiver0>;
+#endif
 	};
 #endif
 };
 
+#if (!SW_LCD_EN) && (SW_GPIO8_CAN0_STB)
+&can_transceiver0 {
+	standby-gpios = <&pinctrl RZG3E_GPIO(5, 4) GPIO_ACTIVE_HIGH>;
+	status = "okay";
+};
+#endif
+
+#if (!SW_LCD_EN) && (SW_GPIO9_CAN1_STB)
+&can_transceiver1 {
+	standby-gpios = <&pinctrl RZG3E_GPIO(5, 5) GPIO_ACTIVE_HIGH>;
+	status = "okay";
+};
+#endif
+
 &pinctrl {
 	canfd_pins: canfd {
 		can1_pins: can1 {

arch/arm64/boot/dts/renesas/renesas-smarc2.dtsi

@@ -12,6 +12,17 @@
  * SW_SDIO_M2E:
  *     0 - SMARC SDIO signal is connected to uSD1
  *     1 - SMARC SDIO signal is connected to M.2 Key E connector
+ *
+ * Please set the switch position SW_GPIO_CAN_PMOD on the carrier board and the
+ * corresponding macro SW_GPIO8_CAN0_STB/SW_GPIO8_CAN0_STB on the board DTS:
+ *
+ * SW_GPIO8_CAN0_STB:
+ *	0 - Connect to GPIO8 PMOD (default)
+ *	1 - Connect to CAN0 transceiver STB pin
+ *
+ * SW_GPIO9_CAN1_STB:
+ *	0 - Connect to GPIO9 PMOD (default)
+ *	1 - Connect to CAN1 transceiver STB pin
  */
 
 / {
@@ -27,6 +38,20 @@
 		serial3 = &scif0;
 		mmc1 = &sdhi1;
 	};
+
+	can_transceiver0: can-phy0 {
+		compatible = "ti,tcan1042";
+		#phy-cells = <0>;
+		max-bitrate = <8000000>;
+		status = "disabled";
+	};
+
+	can_transceiver1: can-phy1 {
+		compatible = "ti,tcan1042";
+		#phy-cells = <0>;
+		max-bitrate = <8000000>;
+		status = "disabled";
+	};
 };
 
 &canfd {