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doc: dt: fsl-imx-esdhc: add set tuning start point binding 

add tuning start point binding

Signed-off-by: Dong Aisheng <aisheng.dong@nxp.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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Dong Aisheng 2016-07-12 15:46:16 +08:00 committed by Ulf Hansson
parent d87fc96636
commit 152f05c783
1 changed files with 2 additions and 0 deletions
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Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt
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@ -28,6 +28,8 @@ Optional properties:
transparent level shifters on the outputs of the controller. Two cells are transparent level shifters on the outputs of the controller. Two cells are
required, first cell specifies minimum slot voltage (mV), second cell required, first cell specifies minimum slot voltage (mV), second cell
specifies maximum slot voltage (mV). Several ranges could be specified. specifies maximum slot voltage (mV). Several ranges could be specified.
- fsl,tuning-start-tap: Specify the start dealy cell point when send first CMD19
in tuning procedure.
- fsl,tuning-step: Specify the increasing delay cell steps in tuning procedure. - 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. 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 This property allows user to change the tuning step to more than one delay