Re: [PATCH 1/2] devicetree: add documentation for MAX30102 oximeter

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On Sun, Jan 22, 2017 at 4:22 AM, Jonathan Cameron <jic23@xxxxxxxxxx> wrote:
> On 20/01/17 05:40, Matt Ranostay wrote:
>> Cc: devicetree@xxxxxxxxxxxxxxx
>> Signed-off-by: Matt Ranostay <matt@ranostay.consulting>
>> ---
>>  .../devicetree/bindings/iio/health/max30102.txt    | 30 ++++++++++++++++++++++
>>  1 file changed, 30 insertions(+)
>>  create mode 100644 Documentation/devicetree/bindings/iio/health/max30102.txt
>>
>> diff --git a/Documentation/devicetree/bindings/iio/health/max30102.txt b/Documentation/devicetree/bindings/iio/health/max30102.txt
>> new file mode 100644
>> index 000000000000..c93d1bb25597
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iio/health/max30102.txt
>> @@ -0,0 +1,30 @@
>> +Maxim MAX30102 heart rate and pulse oximeter sensor
>> +
>> +* https://datasheets.maximintegrated.com/en/ds/MAX30102.pdf
>> +
>> +Required properties:
>> +  - compatible: must be "maxim,max30102"
>> +  - reg: the I2C address of the sensor
>> +  - interrupt-parent: should be the phandle for the interrupt controller
>> +  - interrupts: the sole interrupt generated by the device
>> +
>> +  Refer to interrupt-controller/interrupts.txt for generic
>> +  interrupt client node bindings.
>> +
>> +Optional properties:
>> +  - maxim,red-led-current-microamp: configuration for RED LED current
>> +  - maxim,ir-led-current-microamp: configuration for IR LED current
>> +
>> +    Note that each step is approximately 200 microamps, ranging from 0 uA to
>> +    50800 uA.
> Are these due to the hardware present, or are we looking at something that should
> be controllable from userspace?

Generally you'd set this value based on the hardware application it is
being used for.. namely if you had a plastic case or wristband that is
affecting the signal..

>> +
>> +Example:
>> +
>> +max30100@57 {
>> +     compatible = "maxim,max30102";
>> +     reg = <57>;
>> +     maxim,red-led-current-microamp = <7000>;
>> +     maxim,ir-led-current-microamp = <7000>;
>> +     interrupt-parent = <&gpio1>;
>> +     interrupts = <16 2>;
>> +};
>>
>
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