boards: art_pi2: Add SDMMC1 configuration with PLL2 kernel clock

Configure SDMMC1 with 4-bit bus width and card detection. Use PLL2S
as kernel peripheral clock (150MHz) divided by 15 to achieve 10MHz
SDMMC clock with clk-div = <13>.

Signed-off-by: Shan Pen <[email protected]>

Author: bricle

boards/ruiside/art_pi2/Kconfig.defconfig

@@ -0,0 +1,12 @@
+# ART-Pi2 board configuration
+#
+# Copyright (c) 2025 Shan Pen <[email protected]>
+#
+# SPDX-License-Identifier: Apache-2.0
+
+if DISK_DRIVER_SDMMC
+
+config SDMMC_STM32_CLOCK_CHECK
+	default n
+
+endif # DISK_DRIVER_SDMMC

boards/ruiside/art_pi2/art_pi2.dts

@@ -80,6 +80,18 @@
 	status = "okay";
 };
 
+&pll2 {
+	div-m = <2>;
+	mul-n = <50>;
+	div-p = <2>;
+	div-q = <2>;
+	div-r = <2>;
+	div-s = <4>;
+	div-t = <2>;
+	clocks = <&clk_hse>;
+	status = "okay";
+};
+
 &rcc {
 	clocks = <&pll>;
 	clock-frequency = <DT_FREQ_M(250)>;
@@ -98,6 +110,18 @@
 	status = "okay";
 };
 
+&sdmmc1 {
+	pinctrl-0 = <&sdmmc1_d0_pc8 &sdmmc1_d1_pc9
+		     &sdmmc1_d2_pc10 &sdmmc1_d3_pc11
+		     &sdmmc1_ck_pc12 &sdmmc1_cmd_pd2>;
+	pinctrl-names = "default";
+	clk-div = <13>;
+	bus-width = <4>;
+	cd-gpios = <&gpion 7 (GPIO_ACTIVE_HIGH | GPIO_PULL_UP)>;
+	disk-name = "SD";
+	status = "okay";
+};
+
 &rng {
 	status = "okay";
 };