On 13/04/16 23:20, Marek Vasut wrote:
> On 04/11/2016 09:42 PM, Rob Herring wrote:
>> On Sun, Apr 10, 2016 at 01:03:18PM +0000, Harald Geyer wrote:
>>> commit f836c45922446df872250a12dd08e48978aceb2f moved mxs-lradc driver
>>> out of staging. However the binding document was left in the old place.
>>
>> A move out of staging should probably imply a review. Though we don't
>> have clear rules around that for bindings.
>>
>>>
>>> Signed-off-by: Harald Geyer <harald@xxxxxxxxx>
cc'ing Dmitry and linux-input.
>>> ---
>>> .../devicetree/bindings/iio/adc/mxs-lradc.txt | 47 ++++++++++++++++++++++
>>> .../bindings/staging/iio/adc/mxs-lradc.txt | 47 ----------------------
>>> 2 files changed, 47 insertions(+), 47 deletions(-)
>>> create mode 100644 Documentation/devicetree/bindings/iio/adc/mxs-lradc.txt
>>> delete mode 100644 Documentation/devicetree/bindings/staging/iio/adc/mxs-lradc.txt
>>>
>>> diff --git a/Documentation/devicetree/bindings/iio/adc/mxs-lradc.txt b/Documentation/devicetree/bindings/iio/adc/mxs-lradc.txt
>>> new file mode 100644
>>> index 0000000..555fb11
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/iio/adc/mxs-lradc.txt
>>> @@ -0,0 +1,47 @@
>>> +* Freescale MXS LRADC device driver
>>> +
>>> +Required properties:
>>> +- compatible: Should be "fsl,imx23-lradc" for i.MX23 SoC and "fsl,imx28-lradc"
>>> + for i.MX28 SoC
>>> +- reg: Address and length of the register set for the device
>>> +- interrupts: Should contain the LRADC interrupts
>>> +
>>> +Optional properties:
>>> +- fsl,lradc-touchscreen-wires: Number of wires used to connect the touchscreen
>>> + to LRADC. Valid value is either 4 or 5. If this
>>> + property is not present, then the touchscreen is
>>> + disabled. 5 wires is valid for i.MX28 SoC only.
>>
>> Standard touchscreen property?
>
> Looks quite standard-ish to me indeed. It is my fault for bringing this
> baggage in back when I wrote the driver, but now that we're moving the
> driver out of staging, it would make sense to deprecate such properties
> and use standard ones (if they got fleshed out during that time).
>
> We now have "atmel,adc-ts-wires" , "ti,wires" ,
> "fsl,lradc-touchscreen-wires" , so some sort of pattern is developing here.
>
>>> +- fsl,ave-ctrl: number of samples per direction to calculate an average value.
>>> + Allowed value is 1 ... 32, default is 4
>>> +- fsl,ave-delay: delay between consecutive samples. Allowed value is
>>> + 2 ... 2048. It is used if 'fsl,ave-ctrl' > 1, counts at
>>> + 2 kHz and its default is 2 (= 1 ms)
>>
>> ditto.
>>
>> If not, it should have units.
>
> Agreed, this is standard ADC sampling frequency I think.
>
>>> +- fsl,settling: delay between plate switch to next sample. Allowed value is
>>> + 1 ... 2047. It counts at 2 kHz and its default is
>>> + 10 (= 5 ms)
>>
>> ditto.
>>
>>> +
>>> +Example for i.MX23 SoC:
>>> +
>>> + lradc@80050000 {
>>> + compatible = "fsl,imx23-lradc";
>>> + reg = <0x80050000 0x2000>;
>>> + interrupts = <36 37 38 39 40 41 42 43 44>;
>>> + status = "okay";
>>> + fsl,lradc-touchscreen-wires = <4>;
>>> + fsl,ave-ctrl = <4>;
>>> + fsl,ave-delay = <2>;
>>> + fsl,settling = <10>;
>>> + };
>>> +
>>> +Example for i.MX28 SoC:
>>> +
>>> + lradc@80050000 {
>>> + compatible = "fsl,imx28-lradc";
>>> + reg = <0x80050000 0x2000>;
>>> + interrupts = <10 14 15 16 17 18 19 20 21 22 23 24 25>;
>>> + status = "okay";
>>> + fsl,lradc-touchscreen-wires = <5>;
>>> + fsl,ave-ctrl = <4>;
>>> + fsl,ave-delay = <2>;
>>> + fsl,settling = <10>;
>>> + };
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>
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