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mmc: dt: bus-width can be an optional property

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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>
This commit is contained in:
Shawn Guo 2013-01-28 16:49:11 -05:00 committed by Chris Ball
parent af51079e68
commit 28c2a62bd5
1 changed files with 2 additions and 3 deletions
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5
Documentation/devicetree/bindings/mmc/mmc.txt
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@ -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