Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / Documentation / devicetree / bindings / mmc / atmel-hsmci.txt

diff --git a/kernel/Documentation/devicetree/bindings/mmc/atmel-hsmci.txt b/kernel/Documentation/devicetree/bindings/mmc/atmel-hsmci.txt
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+* 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>;
+       };
+};