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authorBenoit Cousson <b-cousson@ti.com>2011-12-22 15:56:36 +0100
committerBen Dooks <ben-linux@fluff.org>2012-01-17 22:44:57 +0000
commit6145197be6cc0583fa1a2f4ec1079d366137061e (patch)
treeebade77ae1a25a56e822feed87c7135d01500083 /Documentation
parent78e1cf42ee3efd2c3e8af0b97cf0a0a570cc0c1f (diff)
downloadlinux-linaro-stable-6145197be6cc0583fa1a2f4ec1079d366137061e.tar.gz
i2c: OMAP: Add DT support for i2c controller
Add initial DT support to retrieve the frequency using a DT attribute instead of the pdata pointer if of_node exist. Add documentation for omap i2c controller binding. Based on original patches from Manju and Grant. Signed-off-by: Benoit Cousson <b-cousson@ti.com> Cc: Ben Dooks <ben-linux@fluff.org> Reviewed-by: Rob Herring <rob.herring@calxeda.com> Acked-by: Grant Likely <grant.likely@secretlab.ca> Signed-off-by: Kevin Hilman <khilman@ti.com>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/devicetree/bindings/i2c/omap-i2c.txt30
1 files changed, 30 insertions, 0 deletions
diff --git a/Documentation/devicetree/bindings/i2c/omap-i2c.txt b/Documentation/devicetree/bindings/i2c/omap-i2c.txt
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+I2C for OMAP platforms
+
+Required properties :
+- compatible : Must be "ti,omap3-i2c" or "ti,omap4-i2c"
+- ti,hwmods : Must be "i2c<n>", n being the instance number (1-based)
+- #address-cells = <1>;
+- #size-cells = <0>;
+
+Recommended properties :
+- clock-frequency : Desired I2C bus clock frequency in Hz. Otherwise
+ the default 100 kHz frequency will be used.
+
+Optional properties:
+- Child nodes conforming to i2c bus binding
+
+Note: Current implementation will fetch base address, irq and dma
+from omap hwmod data base during device registration.
+Future plan is to migrate hwmod data base contents into device tree
+blob so that, all the required data will be used from device tree dts
+file.
+
+Examples :
+
+i2c1: i2c@0 {
+ compatible = "ti,omap3-i2c";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ ti,hwmods = "i2c1";
+ clock-frequency = <400000>;
+};