mvebu: clearfog: Detect MMC vs SDHC and fixup fdt

The Clearfog devices have only one SDHC device.  This
is either eMMC if it is populated on the SOM or SDHC
if not.  Detect if the device is an eMMC and fixup the
device-tree so it will be detected by Linux.

Signed-off-by: Jon Nettleton <jon@solid-run.com>

board/solidrun/clearfog/clearfog.c

@@ -8,6 +8,7 @@
 #include <dm.h>
 #include <i2c.h>
 #include <miiphy.h>
+#include <mmc.h>
 #include <netdev.h>
 #include <rtc.h>
 #include <asm/io.h>
@@ -183,3 +184,29 @@ int board_eth_init(bd_t *bis)
 	cpu_eth_init(bis); /* Built in controller(s) come first */
 	return pci_eth_init(bis);
 }
+
+static bool has_emmc(void)
+{
+	struct mmc *mmc;
+	mmc = find_mmc_device(0);
+	if (!mmc)
+		return 0;
+	return (!mmc_init(mmc) && IS_MMC(mmc)) ? true : false;
+}
+
+#ifdef CONFIG_OF_LIBFDT
+int ft_board_setup(void *blob, bd_t *bd)
+{
+	__maybe_unused int offset;
+
+	if (has_emmc()) {
+		offset = fdt_path_offset(blob, "/soc/internal-regs/sdhci@d8000");
+		if (offset >= 0) {
+			fdt_delprop(blob, offset, "cd-gpios");
+			fdt_setprop_empty(blob, offset, "non-removable");
+		}
+	}
+
+	return 0;
+}
+#endif

configs/clearfog_defconfig

@@ -63,3 +63,4 @@ CONFIG_RTC_MVEBU=y
 CONFIG_SCSI=y
 CONFIG_NET_RANDOM_ETHADDR=y
 CONFIG_NET_RANDOM_ETHADDR_OUI="d0:63:b4:00:00:00"
+CONFIG_OF_BOARD_SETUP=y