1* Atmel High Speed MultiMedia Card Interface 2 3This controller on atmel products provides an interface for MMC, SD and SDIO 4types of memory cards. 5 6This file documents differences between the core properties described 7by mmc.txt and the properties used by the atmel-mci driver. 8 91) MCI node 10 11Required properties: 12- compatible: should be "atmel,hsmci" 13- #address-cells: should be one. The cell is the slot id. 14- #size-cells: should be zero. 15- at least one slot node 16- clock-names: tuple listing input clock names. 17 Required elements: "mci_clk" 18- clocks: phandles to input clocks. 19 20The node contains child nodes for each slot that the platform uses 21 22Example MCI node: 23 24mmc0: mmc@f0008000 { 25 compatible = "atmel,hsmci"; 26 reg = <0xf0008000 0x600>; 27 interrupts = <12 4>; 28 #address-cells = <1>; 29 #size-cells = <0>; 30 clock-names = "mci_clk"; 31 clocks = <&mci0_clk>; 32 33 [ child node definitions...] 34}; 35 362) slot nodes 37 38Required properties: 39- reg: should contain the slot id. 40- bus-width: number of data lines connected to the controller 41 42Optional properties: 43- cd-gpios: specify GPIOs for card detection 44- cd-inverted: invert the value of external card detect gpio line 45- wp-gpios: specify GPIOs for write protection 46 47Example slot node: 48 49slot@0 { 50 reg = <0>; 51 bus-width = <4>; 52 cd-gpios = <&pioD 15 0> 53 cd-inverted; 54}; 55 56Example full MCI node: 57mmc0: mmc@f0008000 { 58 compatible = "atmel,hsmci"; 59 reg = <0xf0008000 0x600>; 60 interrupts = <12 4>; 61 #address-cells = <1>; 62 #size-cells = <0>; 63 slot@0 { 64 reg = <0>; 65 bus-width = <4>; 66 cd-gpios = <&pioD 15 0> 67 cd-inverted; 68 }; 69 slot@1 { 70 reg = <1>; 71 bus-width = <4>; 72 }; 73}; 74