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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. - reg: Registers location and length.
- interrupts: Interrupts used by the MMC controller. - interrupts: Interrupts used by the MMC controller.
Required properties:
- bus-width: Number of data lines, can be <1>, <4>, or <8>
Card detection: Card detection:
If no property below is supplied, host native card detect is used. If no property below is supplied, host native card detect is used.
Only one of the properties in this section should be supplied: 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. - non-removable: non-removable slot (like eMMC); assume always present.
Optional properties: 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 - wp-gpios: Specify GPIOs for write protection, see gpio binding
- cd-inverted: when present, polarity on the cd gpio line is inverted - cd-inverted: when present, polarity on the cd gpio line is inverted
- wp-inverted: when present, polarity on the wp gpio line is inverted - wp-inverted: when present, polarity on the wp gpio line is inverted