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authorHung-ying Tyan <tyanh@chromium.org>2013-05-15 18:27:28 +0800
committerTom Rini <trini@ti.com>2013-06-26 10:07:11 -0400
commit88364387c60dc72549ccf7f2d595cbf847ab4e17 (patch)
treedb7d5c034dd87ef6fbdf7bc8c26df453d7af9e20 /doc/device-tree-bindings/misc
parentca85eb8c4271509aaac1ccb26ae3eb1a7827b4e6 (diff)
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cros: add cros_ec driver
This patch adds the cros_ec driver that implements the protocol for communicating with Google's ChromeOS embedded controller. Signed-off-by: Bernie Thompson <bhthompson@chromium.org> Signed-off-by: Bill Richardson <wfrichar@chromium.org> Signed-off-by: Che-Liang Chiou <clchiou@chromium.org> Signed-off-by: Doug Anderson <dianders@chromium.org> Signed-off-by: Gabe Black <gabeblack@chromium.org> Signed-off-by: Hung-ying Tyan <tyanh@chromium.org> Signed-off-by: Louis Yung-Chieh Lo <yjlou@chromium.org> Signed-off-by: Randall Spangler <rspangler@chromium.org> Signed-off-by: Sean Paul <seanpaul@chromium.org> Signed-off-by: Simon Glass <sjg@chromium.org> Signed-off-by: Vincent Palatin <vpalatin@chromium.org> Acked-by: Simon Glass <sjg@chromium.org> Tested-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'doc/device-tree-bindings/misc')
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diff --git a/doc/device-tree-bindings/misc/cros-ec.txt b/doc/device-tree-bindings/misc/cros-ec.txt
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+Chrome OS CROS_EC Binding
+======================
+
+The device tree node which describes the operation of the CROS_EC interface
+is as follows:
+
+Required properties :
+- compatible = "google,cros-ec"
+
+Optional properties :
+- spi-max-frequency : Sets the maximum frequency (in Hz) for SPI bus
+ operation
+- i2c-max-frequency : Sets the maximum frequency (in Hz) for I2C bus
+ operation
+- ec-interrupt : Selects the EC interrupt, defined as a GPIO according
+ to the platform
+- optimise-flash-write : Boolean property - if present then flash blocks
+ containing all 0xff will not be written, since we assume that the EC
+ uses that pattern for erased blocks
+
+The CROS_EC node should appear as a subnode of the interrupt that connects it
+to the EC (e.g. i2c, spi, lpc). The reg property (as usual) will indicate
+the unit address on that bus.
+
+
+Example
+=======
+
+ spi@131b0000 {
+ cros-ec@0 {
+ reg = <0>;
+ compatible = "google,cros-ec";
+ spi-max-frequency = <5000000>;
+ ec-interrupt = <&gpio 174 1>;
+ optimise-flash-write;
+ status = "disabled";
+ };
+ };