On Fri, 13 Apr 2018 13:36:48 -0300
Hernán Gonzalez <hernan@xxxxxxxxxxxxxxxxxxxx> wrote:
> Cc: Rob Herring <robh+dt@xxxxxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Cc: devicetree@xxxxxxxxxxxxxxx
> Signed-off-by: Hernán Gonzalez <hernan@xxxxxxxxxxxxxxxxxxxx>
A few comments inline.
Thanks,
Jonathan
> ---
> .../devicetree/bindings/staging/iio/cdc/ad7746.txt | 34 ++++++++++++++++++++++
> 1 file changed, 34 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/staging/iio/cdc/ad7746.txt
>
> diff --git a/Documentation/devicetree/bindings/staging/iio/cdc/ad7746.txt b/Documentation/devicetree/bindings/staging/iio/cdc/ad7746.txt
> new file mode 100644
> index 0000000..7740f05
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/staging/iio/cdc/ad7746.txt
> @@ -0,0 +1,34 @@
> +Analog Devices AD7746/5/7 capacitive sensor driver
> +
> +Required properties:
> + - compatible: Should be one of
> + * "adi,ad7745"
> + * "adi,ad7746"
> + * "adi,ad7747"
> + - reg: The 7-bits long I2c address of the device
> +
> +Optional properties:
> + - adi,exclvl: This property defines the excitation voltage level for the
> + capacitance to be measured. Possible values are:
> + * 0 = +-VDD/8
> + * 1 = +-VDD/4
> + * 2 = +-VDD * 3/8
> + * 3 = +-VDD/2 (Default)
> + - adi,nexca_en: Invert excitation output A.
The naming is rather odd. Why _en?
> + - adi,nexcb_en: Invert excitation output B.
> +
> +Example:
> +Here exclvl would be 1 (VDD/4), Excitation pin A would be inverted and
> +Excitation pin B would NOT be inverted.
> +
> +i2c2 {
> +
> + < . . . >
What does this spacer add to the example?
Sure, there can be other devices, but no need to illustrate that here.
> +
> + ad7746: ad7746@60 {
> + compatible = "ad7746";
> + reg = <0x60>;
> + adi,exclvl = <1>;
> + adi,nexca_en;
> + };
> +};
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