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authorIvan T. Ivanov <iivanov@mm-sol.com>2014-03-13 19:07:42 -0700
committerWolfram Sang <wsa@the-dreams.de>2014-03-28 23:41:26 +0100
commit61284405025d1ea646f1f9a1f740e6b573b8c9d1 (patch)
tree51291ec12210468c47dfce2a9a03fe45f7bb0115 /Documentation
parenta9965d73fdc9684bb55ae8be4f0ddc8067dca1c8 (diff)
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i2c: qup: Add device tree bindings information
The Qualcomm Universal Peripherial (QUP) wraps I2C mini-core and provide input and output FIFO's for it. I2C controller can operate as master with supported bus speeds of 100Kbps and 400Kbps. Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com> [bjorn: reformulated part of binding description added version to compatible cleaned up example] Signed-off-by: Bjorn Andersson <bjorn.andersson@sonymobile.com> Acked-by: Rob Herring <robh@kernel.org> [wsa: removed the dummy child node which was a confusing example] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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+Qualcomm Universal Peripheral (QUP) I2C controller
+
+Required properties:
+ - compatible: Should be:
+ * "qcom,i2c-qup-v1.1.1" for 8660, 8960 and 8064.
+ * "qcom,i2c-qup-v2.1.1" for 8974 v1.
+ * "qcom,i2c-qup-v2.2.1" for 8974 v2 and later.
+ - reg: Should contain QUP register address and length.
+ - interrupts: Should contain I2C interrupt.
+
+ - clocks: A list of phandles + clock-specifiers, one for each entry in
+ clock-names.
+ - clock-names: Should contain:
+ * "core" for the core clock
+ * "iface" for the AHB clock
+
+ - #address-cells: Should be <1> Address cells for i2c device address
+ - #size-cells: Should be <0> as i2c addresses have no size component
+
+Optional properties:
+ - clock-frequency: Should specify the desired i2c bus clock frequency in Hz,
+ defaults to 100kHz if omitted.
+
+Child nodes should conform to i2c bus binding.
+
+Example:
+
+ i2c@f9924000 {
+ compatible = "qcom,i2c-qup-v2.2.1";
+ reg = <0xf9924000 0x1000>;
+ interrupts = <0 96 0>;
+
+ clocks = <&gcc GCC_BLSP1_QUP2_I2C_APPS_CLK>, <&gcc GCC_BLSP1_AHB_CLK>;
+ clock-names = "core", "iface";
+
+ clock-frequency = <355000>;
+
+ #address-cells = <1>;
+ #size-cells = <0>;
+ };
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