arm64: dts: amlogic: t7: khadas-vim4: Add SDIO power sequence and WiFi clock

Add the SDIO power sequence node using mmc-pwrseq-simple and a
32.768kHz PWM-based clock required by the Wi-Fi module.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Signed-off-by: Ronald Claveau <linux-kernel-dev@aliel.fr>
Link: https://patch.msgid.link/20260326-add-emmc-t7-vim4-v5-7-d3f182b48e9d@aliel.fr
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

Author: rclaveau-tech

arch/arm64/boot/dts/amlogic/amlogic-t7-a311d2-khadas-vim4.dts

@@ -68,6 +68,15 @@
 		regulator-always-on;
 	};
 
+	sdio_pwrseq: sdio-pwrseq {
+		compatible = "mmc-pwrseq-simple";
+		reset-gpios = <&gpio GPIOX_6 GPIO_ACTIVE_LOW>;
+		post-power-on-delay-ms = <500>;
+		power-off-delay-us = <200000>;
+		clocks = <&wifi32k>;
+		clock-names = "ext_clock";
+	};
+
 	vcc5v: regulator-vcc-5v {
 		compatible = "regulator-fixed";
 		regulator-name = "VCC5V";
@@ -136,6 +145,19 @@
 		states = <1800000 1
 			  3300000 0>;
 	};
+
+	wifi32k: wifi32k {
+		compatible = "pwm-clock";
+		#clock-cells = <0>;
+		clock-frequency = <32768>;
+			pwms = <&pwm_ab 0 30518 0>;
+	};
+};
+
+&pwm_ab {
+	status = "okay";
+	pinctrl-0 = <&pwm_a_pins>;
+	pinctrl-names = "default";
 };
 
 &uart_a {