sdhci-pci: enable SDIO interface on Intel Merrifield

Intel Merrifield is known to have an SDIO interface and on Intel Edison board a
WiFi card is wired to it.

Enable the interface here to allow WiFi card enumeration.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci-pci-core.c

@@ -419,6 +419,7 @@ static const struct sdhci_pci_fixes sdhci_intel_byt_sd = {
 /* Define Host controllers for Intel Merrifield platform */
 #define INTEL_MRFLD_EMMC_0	0
 #define INTEL_MRFLD_EMMC_1	1
+#define INTEL_MRFLD_SDIO	3
 
 static int intel_mrfld_mmc_probe_slot(struct sdhci_pci_slot *slot)
 {
@@ -431,6 +432,10 @@ static int intel_mrfld_mmc_probe_slot(struct sdhci_pci_slot *slot)
 					 MMC_CAP_8_BIT_DATA |
 					 MMC_CAP_1_8V_DDR;
 		break;
+	case INTEL_MRFLD_SDIO:
+		slot->host->mmc->caps |= MMC_CAP_NONREMOVABLE |
+					 MMC_CAP_POWER_OFF_CARD;
+		break;
 	default:
 		/* SD support is not ready yet */
 		return -ENODEV;