On Fri, Feb 21, 2014 at 12:38:09AM +0000, Bjorn Andersson wrote:
> From: "Ivan T. Ivanov" <iivanov@xxxxxxxxxx>
>
> 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@xxxxxxxxxx>
> [bjorn: reformulated part of binding description
> added version to compatible
> cleaned up example]
> Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxxxxxx>
> ---
> .../devicetree/bindings/i2c/qcom,i2c-qup.txt | 44 ++++++++++++++++++++
> 1 file changed, 44 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt
>
> diff --git a/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt b/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt
> new file mode 100644
> index 0000000..38d505f
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/i2c/qcom,i2c-qup.txt
> @@ -0,0 +1,44 @@
> +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: Should contain the core clock and the AHB clock.
> + - clock-names: Should be "core" for the core clock and "iface" for the
> + AHB clock.
Could you please describe clocks in terms of clock-names? It makes the
relationship clearer, and avoids redundancy (which makes extending the
bindnig easier):
- 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
Cheers,
Mark.
> +
> + - #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>;
> +
> + dummy@60 {
> + compatible = "dummy";
> + reg = <0x60>;
> + };
> + };
> +
> --
> 1.7.9.5
>
>
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