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Documentation / devicetree / bindings / mmc / fsl-imx-esdhc.txt




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Based on kernel version 4.1. Page generated on 2015-06-28 12:09 EST.

1	* Freescale Enhanced Secure Digital Host Controller (eSDHC) for i.MX
2	
3	The Enhanced Secure Digital Host Controller on Freescale i.MX family
4	provides an interface for MMC, SD, and SDIO types of memory cards.
5	
6	This file documents differences between the core properties described
7	by mmc.txt and the properties used by the sdhci-esdhc-imx driver.
8	
9	Required properties:
10	- compatible : Should be "fsl,<chip>-esdhc"
11	
12	Optional properties:
13	- fsl,cd-controller : Indicate to use controller internal card detection
14	- fsl,wp-controller : Indicate to use controller internal write protection
15	- fsl,delay-line : Specify the number of delay cells for override mode.
16	  This is used to set the clock delay for DLL(Delay Line) on override mode
17	  to select a proper data sampling window in case the clock quality is not good
18	  due to signal path is too long on the board. Please refer to eSDHC/uSDHC
19	  chapter, DLL (Delay Line) section in RM for details.
20	- voltage-ranges : Specify the voltage range in case there are software
21	  transparent level shifters on the outputs of the controller. Two cells are
22	  required, first cell specifies minimum slot voltage (mV), second cell
23	  specifies maximum slot voltage (mV). Several ranges could be specified.
24	
25	Examples:
26	
27	esdhc@70004000 {
28		compatible = "fsl,imx51-esdhc";
29		reg = <0x70004000 0x4000>;
30		interrupts = <1>;
31		fsl,cd-controller;
32		fsl,wp-controller;
33	};
34	
35	esdhc@70008000 {
36		compatible = "fsl,imx51-esdhc";
37		reg = <0x70008000 0x4000>;
38		interrupts = <2>;
39		cd-gpios = <&gpio1 6 0>; /* GPIO1_6 */
40		wp-gpios = <&gpio1 5 0>; /* GPIO1_5 */
41	};
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