On Wed, Jan 20, 2016 at 6:45 AM, Sean Nyekjær <sean.nyekjaer@xxxxxxxxx> wrote:
> Hi
>
> Yes i need to add the gpio-controller and #gpio-cells. But i'm not exactly
> sure what gpio-cells means and its difficult to find in documentation.
#*-cells are standard properties that a producer sets for clients to
describe their connection and are necessary to know how to parse
properties such as *-gpios in this case.
> I found this in the documentation:
> #gpio-cells: The first cell is the GPIO number and the second cell is used
> to specify the GPIO polarity.
>
> This device only supports inputs so the gpio-cells option needs to be <1>
> or ??
> #gpio-cells = <1>;
Most controllers use 2 even if 2nd field is unused. You can use the
2nd field for inputs too. For example, specify that a detect line is
active high or low for detect.
Rob
>
> /Sean
>
>
> On 2016-01-19 18:20, Rob Herring wrote:
>>
>> On Tue, Jan 19, 2016 at 11:22:20AM +0100, Sean Nyekjaer wrote:
>>>
>>> Signed-off-by: Sean Nyekjaer <sean.nyekjaer@xxxxxxxxx>
>>> ---
>>> Documentation/devicetree/bindings/gpio/gpio-sn65hvs885.txt | 9
>>> +++++++++
>>> 1 file changed, 9 insertions(+)
>>> create mode 100644
>>> Documentation/devicetree/bindings/gpio/gpio-sn65hvs885.txt
>>>
>>> diff --git a/Documentation/devicetree/bindings/gpio/gpio-sn65hvs885.txt
>>> b/Documentation/devicetree/bindings/gpio/gpio-sn65hvs885.txt
>>> new file mode 100644
>>> index 0000000..56679ac
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/gpio/gpio-sn65hvs885.txt
>>> @@ -0,0 +1,9 @@
>>> +* TI SN65HVS885 digital-input serializer
>>> +
>>> +Example:
>>> + sn65hvs885@3 {
>>> + compatible = "sn65hvs885";
>>> + spi-max-frequency = <10000000>;
>>> + reg = <0>;
>>
>> What about all the standard gpio controller properties?
>>
>>> + };
>>> +
>>> --
>>> 2.7.0
>>>
>>> --
>>> To unsubscribe from this list: send the line "unsubscribe devicetree" in
>>> the body of a message to majordomo@xxxxxxxxxxxxxxx
>>> More majordomo info at http://vger.kernel.org/majordomo-info.html
>
>
> --
> To unsubscribe from this list: send the line "unsubscribe devicetree" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
