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authorArnd Bergmann <arnd@arndb.de>2012-05-13 00:14:24 -0400
committerArnd Bergmann <arnd@arndb.de>2012-05-15 13:29:42 +0200
commit7f217794ffa72f208a250b79ab0b7ea3de19677f (patch)
treee158792f6662bc7cad4e55a62f4efe7426215141 /Documentation/devicetree/bindings/mmc/mmc.txt
parentMerge branch 'omap/dt-missed-3.4' into drivers/mmc (diff)
downloadlinux-dev-7f217794ffa72f208a250b79ab0b7ea3de19677f.tar.xz
linux-dev-7f217794ffa72f208a250b79ab0b7ea3de19677f.zip
mmc: dt: Consolidate DT bindings
This patch unifies the current DT MMC bindings documentation and code, adds generic MMC DT bindings documentation, and updates .dts files for consistency. [cjb: typo fixes, addition of max-frequency property] Signed-off-by: Chris Ball <cjb@laptop.org> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
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diff --git a/Documentation/devicetree/bindings/mmc/mmc.txt b/Documentation/devicetree/bindings/mmc/mmc.txt
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+These properties are common to multiple MMC host controllers. Any host
+that requires the respective functionality should implement them using
+these definitions.
+
+Required properties:
+- bus-width: Number of data lines, can be <1>, <4>, or <8>
+
+Optional properties:
+- cd-gpios : Specify GPIOs for card detection, see gpio binding
+- wp-gpios : Specify GPIOs for write protection, see gpio binding
+- cd-inverted: when present, polarity on the wp gpio line is inverted
+- wp-inverted: when present, polarity on the wp gpio line is inverted
+- non-removable: non-removable slot (like eMMC)
+- max-frequency: maximum operating clock frequency
+
+Example:
+
+sdhci@ab000000 {
+ compatible = "sdhci";
+ reg = <0xab000000 0x200>;
+ interrupts = <23>;
+ bus-width = <4>;
+ cd-gpios = <&gpio 69 0>;
+ cd-inverted;
+ wp-gpios = <&gpio 70 0>;
+ max-frequency = <50000000>;
+}