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Diffstat (limited to 'kernel/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt')
| -rw-r--r-- | kernel/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt | 41 |
1 files changed, 41 insertions, 0 deletions
diff --git a/kernel/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt b/kernel/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt new file mode 100644 index 000000000..415c5575c --- /dev/null +++ b/kernel/Documentation/devicetree/bindings/mmc/fsl-imx-esdhc.txt @@ -0,0 +1,41 @@ +* Freescale Enhanced Secure Digital Host Controller (eSDHC) for i.MX + +The Enhanced Secure Digital Host Controller on Freescale i.MX family +provides an interface for MMC, SD, and SDIO types of memory cards. + +This file documents differences between the core properties described +by mmc.txt and the properties used by the sdhci-esdhc-imx driver. + +Required properties: +- compatible : Should be "fsl,<chip>-esdhc" + +Optional properties: +- fsl,cd-controller : Indicate to use controller internal card detection +- fsl,wp-controller : Indicate to use controller internal write protection +- fsl,delay-line : Specify the number of delay cells for override mode. + This is used to set the clock delay for DLL(Delay Line) on override mode + to select a proper data sampling window in case the clock quality is not good + due to signal path is too long on the board. Please refer to eSDHC/uSDHC + chapter, DLL (Delay Line) section in RM for details. +- voltage-ranges : Specify the voltage range in case there are software + 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. + +Examples: + +esdhc@70004000 { + compatible = "fsl,imx51-esdhc"; + reg = <0x70004000 0x4000>; + interrupts = <1>; + fsl,cd-controller; + fsl,wp-controller; +}; + +esdhc@70008000 { + compatible = "fsl,imx51-esdhc"; + reg = <0x70008000 0x4000>; + interrupts = <2>; + cd-gpios = <&gpio1 6 0>; /* GPIO1_6 */ + wp-gpios = <&gpio1 5 0>; /* GPIO1_5 */ +}; |