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| author | Hung-ying Tyan <tyanh@chromium.org> | 2013-05-15 18:27:28 +0800 |
|---|---|---|
| committer | Tom Rini <trini@ti.com> | 2013-06-26 10:07:11 -0400 |
| commit | 88364387c60dc72549ccf7f2d595cbf847ab4e17 (patch) | |
| tree | db7d5c034dd87ef6fbdf7bc8c26df453d7af9e20 /doc/device-tree-bindings | |
| parent | ca85eb8c4271509aaac1ccb26ae3eb1a7827b4e6 (diff) | |
| download | blackbird-obmc-uboot-88364387c60dc72549ccf7f2d595cbf847ab4e17.tar.gz blackbird-obmc-uboot-88364387c60dc72549ccf7f2d595cbf847ab4e17.zip | |
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')
| -rw-r--r-- | doc/device-tree-bindings/misc/cros-ec.txt | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/doc/device-tree-bindings/misc/cros-ec.txt b/doc/device-tree-bindings/misc/cros-ec.txt new file mode 100644 index 0000000000..07ea7cdeac --- /dev/null +++ b/doc/device-tree-bindings/misc/cros-ec.txt @@ -0,0 +1,38 @@ +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"; + }; + }; |
