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mmc: sdhci-esdhc-imx: Document new DT bindings for imx7d support

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Add a required property "fsl,imx7d-usdhc" in binding doc.
Add an optional property "fsl,tuning-step" in binding doc.

Signed-off-by: Haibo Chen <haibo.chen@freescale.com>
Acked-by: Dong Aisheng <aisheng.dong@freescale.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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Haibo Chen 2015-08-11 19:38:28 +08:00 committed by Ulf Hansson
parent 77bd2f6f6c
commit 2a2a7ea7c0
1 changed files with 6 additions and 0 deletions
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6
Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
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@ -15,6 +15,7 @@ Required properties:
"fsl,imx6q-usdhc"
"fsl,imx6sl-usdhc"
"fsl,imx6sx-usdhc"
"fsl,imx7d-usdhc"
Optional properties:
- fsl,wp-controller : Indicate to use controller internal write protection
@ -27,6 +28,11 @@ Optional properties:
transparent level shifters on the outputs of the controller. Two cells are
required, first cell specifies minimum slot voltage (mV), second cell
specifies maximum slot voltage (mV). Several ranges could be specified.
- fsl,tuning-step: Specify the increasing delay cell steps in tuning procedure.
The uSDHC use one delay cell as default increasing step to do tuning process.
This property allows user to change the tuning step to more than one delay
cells which is useful for some special boards or cards when the default
tuning step can't find the proper delay window within limited tuning retries.
Examples: