Some boards use fixed voltage regulator for vmmc supply (e.g. for eMMC
memories). MMC_CAP2_BROKEN_VOLTAGE must be enabled for them to operate
correctly.

Cc: Ben Dooks <ben-linux@fluff.org>
Cc: Chris Ball <redacted>
CC: linux-mmc at vger.kernel.org
Signed-off-by: Tomasz Figa <redacted>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
---
 Documentation/devicetree/bindings/mmc/mmc.txt | 1 +
 drivers/mmc/host/sdhci-s3c.c                  | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
index 8a6811f..ecbde68 100644
--- a/Documentation/devicetree/bindings/mmc/mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/mmc.txt

@@ -16,6 +16,7 @@ Optional properties:
 - wp-inverted: when present, polarity on the wp gpio line is inverted
 - non-removable: non-removable slot (like eMMC)
 - max-frequency: maximum operating clock frequency
+- broken-voltage: vmmc regulator does not allow voltage control
 
 Example:
 

diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index 445910e..39715b8 100644
--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c

@@ -443,6 +443,9 @@ static int __devinit sdhci_s3c_parse_dt(struct device *dev,
 	if (!ourhost->gpios)
 		return -ENOMEM;
 
+	if (of_get_property(node, "broken-voltage", 0))
+		pdata->host_caps2 |= MMC_CAP2_BROKEN_VOLTAGE;
+
 	/* get the card detection method */
 	if (of_get_property(node, "broken-cd", 0)) {
 		pdata->cd_type = S3C_SDHCI_CD_NONE;