On Tue, Dec 29, 2015 at 10:34 AM, Rob Herring <robh@xxxxxxxxxx> wrote:
> On Sat, Dec 26, 2015 at 08:38:24PM -0800, Matt Ranostay wrote:
>> Allow the current for both RED and IR LEDs to be set via an device tree
>> property setting.
>>
>> This is an optional setting that is useful for applications that have a
>> known glass attenuation factor.
>>
>> Signed-off-by: Matt Ranostay <mranostay@xxxxxxxxx>
>> ---
>> .../devicetree/bindings/iio/health/max30100.txt | 7 +++++++
>> drivers/iio/health/max30100.c | 21 +++++++++++++++------
>> 2 files changed, 22 insertions(+), 6 deletions(-)
>>
>> diff --git a/Documentation/devicetree/bindings/iio/health/max30100.txt b/Documentation/devicetree/bindings/iio/health/max30100.txt
>> index f6fbac6..009314c 100644
>> --- a/Documentation/devicetree/bindings/iio/health/max30100.txt
>> +++ b/Documentation/devicetree/bindings/iio/health/max30100.txt
>> @@ -11,11 +11,18 @@ Required properties:
>> Refer to interrupt-controller/interrupts.txt for generic
>> interrupt client node bindings.
>>
>> +Optional properties:
>> + - max30100,led-current: configuration for LED current (in mA) while the engine
>> + is running. Upper nibble is for the RED LED, and lower nibble the IR LED.
>
> Can you use the common LED binding and led-max-microamp instead?
>
> Otherwise, please add "-microamp" suffix and just split to 2 cells for
> RED and IR LEDs. Also, "max30100" is not a vendor prefix. Use maxim.
Ok.
>
>
>> + ret = of_property_read_u32(np, "max30100,led-current", &val);
>> + if (ret) {
>> + /* Default to 24 mA RED LED, 50 mA IR LED */
>> + val = (MAX30100_REG_LED_CONFIG_24MA <<
>> + MAX30100_REG_LED_CONFIG_RED_LED_SHIFT) |
>> + MAX30100_REG_LED_CONFIG_50MA;
>> + dev_warn(dev, "no led-current set, defaulting to %d", val);
>> + }
>> +
>> + ret = regmap_write(data->regmap, MAX30100_REG_LED_CONFIG, val & 0xFF);
>
> Huh? You say the units are milliamps, but then you use the DT value
> directly?
Yeah they are direct index values in the register. Probably should
make the documentation more clear.
>
> Rob
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