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Diffstat (limited to 'Documentation/devicetree/bindings/mmc/atmel-hsmci.txt')
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diff --git a/Documentation/devicetree/bindings/mmc/atmel-hsmci.txt b/Documentation/devicetree/bindings/mmc/atmel-hsmci.txt new file mode 100644 index 000000000000..0a85c70cd30a --- /dev/null +++ b/Documentation/devicetree/bindings/mmc/atmel-hsmci.txt @@ -0,0 +1,68 @@ +* Atmel High Speed MultiMedia Card Interface + +This controller on atmel products 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 atmel-mci driver. + +1) MCI node + +Required properties: +- compatible: should be "atmel,hsmci" +- #address-cells: should be one. The cell is the slot id. +- #size-cells: should be zero. +- at least one slot node + +The node contains child nodes for each slot that the platform uses + +Example MCI node: + +mmc0: mmc@f0008000 { + compatible = "atmel,hsmci"; + reg = <0xf0008000 0x600>; + interrupts = <12 4>; + #address-cells = <1>; + #size-cells = <0>; + + [ child node definitions...] +}; + +2) slot nodes + +Required properties: +- reg: should contain the slot id. +- bus-width: number of data lines connected to the controller + +Optional properties: +- cd-gpios: specify GPIOs for card detection +- cd-inverted: invert the value of external card detect gpio line +- wp-gpios: specify GPIOs for write protection + +Example slot node: + +slot@0 { + reg = <0>; + bus-width = <4>; + cd-gpios = <&pioD 15 0> + cd-inverted; +}; + +Example full MCI node: +mmc0: mmc@f0008000 { + compatible = "atmel,hsmci"; + reg = <0xf0008000 0x600>; + interrupts = <12 4>; + #address-cells = <1>; + #size-cells = <0>; + slot@0 { + reg = <0>; + bus-width = <4>; + cd-gpios = <&pioD 15 0> + cd-inverted; + }; + slot@1 { + reg = <1>; + bus-width = <4>; + }; +}; |