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@xxxxxxxxx>
Cc: Chris Ball <cjb@xxxxxxxxxx>
CC: linux-mmc@xxxxxxxxxxxxxxx
Signed-off-by: Tomasz Figa <t.figa@xxxxxxxxxxx>
Signed-off-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
---
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;
--
1.7.12
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