dt-bindings: i2c: Add binding for Qualcomm CCI I2C controller

Add DT binding document for Qualcomm Camera Control Interface (CCI)
I2C controller.

Signed-off-by: Todor Tomov <todor.tomov@linaro.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>

diff --git a/Documentation/devicetree/bindings/i2c/i2c-qcom-cci.txt b/Documentation/devicetree/bindings/i2c/i2c-qcom-cci.txt
new file mode 100644 (file)
index 0000000..c6668b7
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+++ b/Documentation/devicetree/bindings/i2c/i2c-qcom-cci.txt
@@ -0,0 +1,92 @@
+Qualcomm Camera Control Interface (CCI) I2C controller
+
+PROPERTIES:
+
+- compatible:
+       Usage: required
+       Value type: <string>
+       Definition: must be one of:
+               "qcom,msm8916-cci"
+               "qcom,msm8996-cci"
+               "qcom,sdm845-cci"
+
+- reg
+       Usage: required
+       Value type: <prop-encoded-array>
+       Definition: base address CCI I2C controller and length of memory
+                   mapped region.
+
+- interrupts:
+       Usage: required
+       Value type: <prop-encoded-array>
+       Definition: specifies the CCI I2C interrupt. The format of the
+                   specifier is defined by the binding document describing
+                   the node's interrupt parent.
+
+- clocks:
+       Usage: required
+       Value type: <prop-encoded-array>
+       Definition: a list of phandle, should contain an entry for each
+                   entries in clock-names.
+
+- clock-names
+       Usage: required
+       Value type: <string>
+       Definition: a list of clock names, must include "cci" clock.
+
+- power-domains
+       Usage: required for "qcom,msm8996-cci"
+       Value type: <prop-encoded-array>
+       Definition:
+
+SUBNODES:
+
+The CCI provides I2C masters for one (msm8916) or two i2c busses (msm8996 and
+sdm845), described as subdevices named "i2c-bus@0" and "i2c-bus@1".
+
+PROPERTIES:
+
+- reg:
+       Usage: required
+       Value type: <u32>
+       Definition: Index of the CCI bus/master
+
+- clock-frequency:
+       Usage: optional
+       Value type: <u32>
+       Definition: Desired I2C bus clock frequency in Hz, defaults to 100
+                   kHz if omitted.
+
+Example:
+
+       cci@a0c000 {
+               compatible = "qcom,msm8996-cci";
+               #address-cells = <1>;
+               #size-cells = <0>;
+               reg = <0xa0c000 0x1000>;
+               interrupts = <GIC_SPI 295 IRQ_TYPE_EDGE_RISING>;
+               clocks = <&mmcc MMSS_MMAGIC_AHB_CLK>,
+                        <&mmcc CAMSS_TOP_AHB_CLK>,
+                        <&mmcc CAMSS_CCI_AHB_CLK>,
+                        <&mmcc CAMSS_CCI_CLK>,
+                        <&mmcc CAMSS_AHB_CLK>;
+               clock-names = "mmss_mmagic_ahb",
+                             "camss_top_ahb",
+                             "cci_ahb",
+                             "cci",
+                             "camss_ahb";
+
+               i2c-bus@0 {
+                       reg = <0>;
+                       clock-frequency = <400000>;
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+               };
+
+               i2c-bus@1 {
+                       reg = <1>;
+                       clock-frequency = <400000>;
+                       #address-cells = <1>;
+                       #size-cells = <0>;
+               };
+       };