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authorShawn Guo <shawn.guo@linaro.org>2013-01-28 16:49:11 -0500
committerChris Ball <cjb@laptop.org>2013-02-24 14:37:04 -0500
commit28c2a62bd53300784b9e6815ae115fb888ac3cfd (patch)
treeba72c57024ffef01df95c93d3ccec734125c8d9b /Documentation
parentaf51079e68d4759e458b0592df5d1fab373c43ae (diff)
mmc: dt: bus-width can be an optional property
None of mmc drivers implements bus-width as a required device tree property. Instead, some drivers like atmel-mci, dw_mmc, sdhci-s3c implement it as an optional one, and will force bus width to be 1 when the property is absent. Let's change the common binding to reflect what the drivers are usually doing. Signed-off-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/mmc/mmc.txt5
1 files changed, 2 insertions, 3 deletions
diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
index 34f28ed9792..469cf53d5a9 100644
--- a/Documentation/devicetree/bindings/mmc/mmc.txt
+++ b/Documentation/devicetree/bindings/mmc/mmc.txt
@@ -6,9 +6,6 @@ Interpreted by the OF core:
- reg: Registers location and length.
- interrupts: Interrupts used by the MMC controller.
-Required properties:
-- bus-width: Number of data lines, can be <1>, <4>, or <8>
-
Card detection:
If no property below is supplied, host native card detect is used.
Only one of the properties in this section should be supplied:
@@ -17,6 +14,8 @@ Only one of the properties in this section should be supplied:
- non-removable: non-removable slot (like eMMC); assume always present.
Optional properties:
+- bus-width: Number of data lines, can be <1>, <4>, or <8>. The default
+ will be <1> if the property is absent.
- wp-gpios: Specify GPIOs for write protection, see gpio binding
- cd-inverted: when present, polarity on the cd gpio line is inverted
- wp-inverted: when present, polarity on the wp gpio line is inverted