arm64: dts: renesas: rzg2l-smarc: Enable GPT on carrier board

The GPT4 IOs are available on the carrier board's PMOD0 connector (J1).
Enable the GPT on the carrier board by adding the GPT pinmux and node on
the carrier board dtsi file.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/20250424054050.28310-4-biju.das.jz@bp.renesas.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>

arch/arm64/boot/dts/renesas/r9a07g044l2-smarc.dts

@@ -27,6 +27,13 @@
 #error "Cannot set 1 to MTU3_COUNTER_Z_PHASE_SIGNAL as PMOD_MTU3=0"
 #endif
 
+/*
+ * To enable the GPT pins GTIOC4A(PMOD0_PIN7) and GTIOC4B(PMOD0_PIN10) on the
+ * PMOD0 connector (J1), enable PMOD0_GPT by setting "#define PMOD0_GPT	1"
+ * below.
+ */
+#define PMOD0_GPT	0
+
 #include "r9a07g044l2.dtsi"
 #include "rzg2l-smarc-som.dtsi"
 #include "rzg2l-smarc-pinfunction.dtsi"

arch/arm64/boot/dts/renesas/r9a07g054l2-smarc.dts

@@ -26,6 +26,13 @@
 #error "Cannot set 1 to MTU3_COUNTER_Z_PHASE_SIGNAL as PMOD_MTU3=0"
 #endif
 
+/*
+ * To enable the GPT pins GTIOC4A(PMOD0_PIN7) and GTIOC4B(PMOD0_PIN10) on the
+ * PMOD0 connector (J1), enable PMOD0_GPT by setting "#define PMOD0_GPT	1"
+ * below.
+ */
+#define PMOD0_GPT	0
+
 #include "r9a07g054l2.dtsi"
 #include "rzg2l-smarc-som.dtsi"
 #include "rzg2l-smarc-pinfunction.dtsi"

arch/arm64/boot/dts/renesas/rzg2l-smarc-pinfunction.dtsi

@@ -38,6 +38,11 @@
 		line-name = "can1_stb";
 	};
 
+	gpt_pins: gpt {
+		pinmux = <RZG2L_PORT_PINMUX(43, 0, 2)>, /* GTIOC4A */
+			 <RZG2L_PORT_PINMUX(43, 1, 2)>; /* GTIOC4B */
+	};
+
 	i2c0_pins: i2c0 {
 		pins = "RIIC0_SDA", "RIIC0_SCL";
 		input-enable;

arch/arm64/boot/dts/renesas/rzg2l-smarc.dtsi

@@ -104,6 +104,14 @@
 	};
 };
 
+#if PMOD0_GPT
+&gpt {
+	pinctrl-0 = <&gpt_pins>;
+	pinctrl-names = "default";
+	status = "okay";
+};
+#endif /* PMOD0_GPT */
+
 &i2c3 {
 	pinctrl-0 = <&i2c3_pins>;
 	pinctrl-names = "default";