| * 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 |
| - clock-names: tuple listing input clock names. |
| Required elements: "mci_clk" |
| - clocks: phandles to input clocks. |
| |
| 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>; |
| clock-names = "mci_clk"; |
| clocks = <&mci0_clk>; |
| |
| [ 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>; |
| }; |
| }; |
