0001 * Atmel High Speed MultiMedia Card Interface
0002
0003 This controller on atmel products provides an interface for MMC, SD and SDIO
0004 types of memory cards.
0005
0006 This file documents differences between the core properties described
0007 by mmc.txt and the properties used by the atmel-mci driver.
0008
0009 1) MCI node
0010
0011 Required properties:
0012 - compatible: should be "atmel,hsmci"
0013 - #address-cells: should be one. The cell is the slot id.
0014 - #size-cells: should be zero.
0015 - at least one slot node
0016 - clock-names: tuple listing input clock names.
0017 Required elements: "mci_clk"
0018 - clocks: phandles to input clocks.
0019
0020 The node contains child nodes for each slot that the platform uses
0021
0022 Example MCI node:
0023
0024 mmc0: mmc@f0008000 {
0025 compatible = "atmel,hsmci";
0026 reg = <0xf0008000 0x600>;
0027 interrupts = <12 4>;
0028 #address-cells = <1>;
0029 #size-cells = <0>;
0030 clock-names = "mci_clk";
0031 clocks = <&mci0_clk>;
0032
0033 [ child node definitions...]
0034 };
0035
0036 2) slot nodes
0037
0038 Required properties:
0039 - reg: should contain the slot id.
0040 - bus-width: number of data lines connected to the controller
0041
0042 Optional properties:
0043 - cd-gpios: specify GPIOs for card detection
0044 - cd-inverted: invert the value of external card detect gpio line
0045 - wp-gpios: specify GPIOs for write protection
0046
0047 Example slot node:
0048
0049 slot@0 {
0050 reg = <0>;
0051 bus-width = <4>;
0052 cd-gpios = <&pioD 15 0>
0053 cd-inverted;
0054 };
0055
0056 Example full MCI node:
0057 mmc0: mmc@f0008000 {
0058 compatible = "atmel,hsmci";
0059 reg = <0xf0008000 0x600>;
0060 interrupts = <12 4>;
0061 #address-cells = <1>;
0062 #size-cells = <0>;
0063 slot@0 {
0064 reg = <0>;
0065 bus-width = <4>;
0066 cd-gpios = <&pioD 15 0>
0067 cd-inverted;
0068 };
0069 slot@1 {
0070 reg = <1>;
0071 bus-width = <4>;
0072 };
0073 };
