dts: add SDIO support to apollo4p_evb

Update dts for using SDIO on apollo4p_evb.

Signed-off-by: Darren Lu <[email protected]>

Author: darrenlu-ambiq

boards/ambiq/apollo4p_evb/apollo4p_evb-pinctrl.dtsi

@@ -171,4 +171,25 @@
 			ambiq,iom-nce-module = <36>;
 		};
 	};
+	sdio0_default: sdio0_default {
+		group0 {
+			pinmux = <SDIF_DAT1_P85>,
+				 <SDIF_DAT3_P87>,
+				 <SDIF_DAT4_P79>,
+				 <SDIF_DAT5_P80>,
+				 <SDIF_DAT6_P81>,
+				 <SDIF_DAT7_P82>;
+				 drive-strength = "1.0";
+		};
+		group1 {
+			pinmux =
+				 <SDIF_DAT0_P84>,
+				 <SDIF_DAT2_P86>,
+				 <SDIF_CMD_P83>,
+				 <SDIF_CLKOUT_P88>;
+				 drive-strength = "1.0";
+				 bias-pull-up;
+				 ambiq,pull-up-ohms = <12000>;
+		};
+	};
 };

boards/ambiq/apollo4p_evb/apollo4p_evb.dts

@@ -26,6 +26,7 @@
 		sw0 = &button0;
 		sw1 = &button1;
 		rtc = &rtc0;
+		sdhc0 = &sdio0;
 	};
 
 	leds {
@@ -154,6 +155,19 @@
 	clk-source = <3>;
 };
 
+&sdio0 {
+	pinctrl-0 = <&sdio0_default>;
+	pinctrl-names = "default";
+	txdelay = <0>;
+	rxdelay = <0>;
+	status = "okay";
+	mmc {
+		compatible = "zephyr,mmc-disk";
+		disk-name = "SD2";
+		status = "okay";
+	};
+};
+
 zephyr_udc0: &usb {
 	vddusb33-gpios = <&gpio96_127 7 (GPIO_PULL_UP)>;
 	vddusb0p9-gpios = <&gpio96_127 5 (GPIO_PULL_UP)>;

dts/arm/ambiq/ambiq_apollo4p.dtsi

@@ -368,6 +368,17 @@
 			status = "disabled";
 		};
 
+		sdio0: sdio@40070000 {
+			compatible = "ambiq,sdio";
+			reg = <0x40070000 0x100>;
+			interrupts = <26 0>;
+			max-bus-freq = <96000000>;
+			min-bus-freq = <375000>;
+			power-delay-ms = <50>;
+			status = "disabled";
+			zephyr,pm-device-runtime-auto;
+		};
+
 		usb: usb@400b0000 {
 			compatible = "ambiq,usb";
 			reg = <0x400B0000 0x4100>;