On 13/09/16 10:53, Heiko Stuebner wrote:
> Hi,
>
> Am Dienstag, 13. September 2016, 17:27:02 CEST schrieb Andy Yan:
>> Add the device tree binding documentation for Light & Proximity sensor
>> STK331X from Sensortek
>>
>> Signed-off-by: Andy Yan <andy.yan@xxxxxxxxxxxxxx>
>> ---
>>
>> .../devicetree/bindings/iio/light/stk3310.txt | 21
>> +++++++++++++++++++++ 1 file changed, 21 insertions(+)
>> create mode 100644 Documentation/devicetree/bindings/iio/light/stk3310.txt
>>
>> diff --git a/Documentation/devicetree/bindings/iio/light/stk3310.txt
>> b/Documentation/devicetree/bindings/iio/light/stk3310.txt new file mode
>> 100644
>> index 0000000..d697118
>> --- /dev/null
>> +++ b/Documentation/devicetree/bindings/iio/light/stk3310.txt
>> @@ -0,0 +1,21 @@
>> +* Sensortek STK331X I2C Light&Proximity sensor
>> +
>> +Required properties:
>> +- compatible: should be "sensortek,STK3310" or "sensortek,STK3311"
>
> I guess that is more a question for Rob / Jonathan regarding the casing.
>
> The stk3310 drivers currently provides both an acpi as well as an i2c module
> table and in both the naming is in upper-case ... probably the i2c table being
> simply a copy of the acpi table.
Yup. Not the best. It should have dropped to lower case for the i2c table.
I missed it. Now it's in there we'll have to maintain both going forward
to avoid breaking anyone.
>
> By using the i2c-quirk of extracting the i2c-id from the compatible, the
> binding here would codify this upper case, while normally i2c tables as well
> as dt-bindings are all lower case.
>
> Looking at kernel c-code and current mainline devicetree files, it doesn't look
> like the i2c-ids gets used anywhere yet, so I guess we could do:
>
> - keep acpi-ids as they are
> - make i2c-ids lower-case
Add another entry that is lowercase...
> - make dt-binding lower-case (and it can still use the i2c quirk to not need a
> separate of id-table)
>
> alternatively we could also just add a separate of-id table with the lower-
> case compatible elements.
Should have one of those as well to allow full matching. Sooner or later
we'll run into a collision with just the part name...
Jonathan
>
>
> Heiko
>
>> +- reg: the I2C address of the device
>> +- interrupt-parent: phandle to the parent interrupt controller
>> +- interrupts: interrupt mapping for GPIO IRQ
>> +
>> +Example:
>> + &i2c1 {
>> + /* ... */
>> +
>> + stk3310@48 {
>> + compatible = "sensortek,STK3310";
>> + reg = <0x48>;
>> + interrupt-parent = <&gpio1>;
>> + interrupts = <5 IRQ_TYPE_LEVEL_LOW>;
>> + };
>> +
>> + /* ... */
>> + };
>
>
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