sys/dts: Add SD card overlays for the BananaPi-F3 SoC

The K1 user manual lists three separate SDHCI devices but the
upstream DTS file only defines the eMMC device.

Create a temporary overlay to allow the BananaPi-F3 to boot from the
SD card until this is addressed upstream.

Differential Revision:	https://reviews.freebsd.org/D57177
Reviewed by:	mhorne

sys/dts/Makefile

@@ -1,3 +1,3 @@
-SUBDIR=arm powerpc
+SUBDIR=arm powerpc riscv
 
 .include <bsd.subdir.mk>

sys/dts/riscv/Makefile

@@ -0,0 +1,5 @@
+DTS!=ls ${.CURDIR}/*.dts
+
+all: test-dts
+
+.include <bsd.init.mk>

sys/dts/riscv/Makefile.inc

@@ -0,0 +1 @@
+.include "../Makefile.inc"

sys/dts/riscv/overlays/Makefile

@@ -0,0 +1,5 @@
+DTSO!=ls ${.CURDIR}/*.dtso
+
+all: test-dtso
+
+.include <bsd.init.mk>

sys/dts/riscv/overlays/spacemit-k1-mmc0.dtso

@@ -0,0 +1,32 @@
+#include <dt-bindings/clock/spacemit,k1-syscon.h>
+
+/dts-v1/;
+/plugin/;
+/ {
+	compatible = "bananapi,bpi-f3", "spacemit,k1";
+};
+
+&{/soc/storage-bus} {
+	sd: mmc@d4280000 {
+		compatible = "spacemit,k1-sdhci";
+		reg = <0x0 0xd4280000 0x0 0x200>;
+		clocks = <&syscon_apmu CLK_SDH_AXI>,
+			 <&syscon_apmu CLK_SDH0>;
+		clock-names = "core", "io";
+		resets = <&syscon_apmu RESET_SDH_AXI>,
+			 <&syscon_apmu RESET_SDH0>;
+		reset-names = "axi", "sdh";
+		interrupts = <99>;
+		status = "disabled";
+	};
+};
+
+&sd {
+	bus-width = <4>;
+	wp-inverted;
+	no-mmc;
+	no-sdio;
+	/* SD supports clock rates up to SDR104. */
+	max-frequency = <208000000>;
+	status = "okay";
+};

sys/modules/dtb/spacemit/Makefile

@@ -1,3 +1,4 @@
 DTS=	spacemit/k1-bananapi-f3.dts
+DTSO=	spacemit-k1-mmc0.dtso
 
 .include <bsd.dtb.mk>