On Tue, May 31, 2016 at 8:44 AM, Laxman Dewangan <ldewangan@xxxxxxxxxx> wrote:
> Hi Rob,
>
> On Tuesday 31 May 2016 07:05 PM, Rob Herring wrote:
>>
>> On Tue, May 31, 2016 at 2:35 AM, Chanwoo Choi <cw00.choi@xxxxxxxxxxx>
>> wrote:
>>>
>>> The extcon-gpio.c driver can separate the kind of external connector
>>> by using the 'extcon-id' property.
>>
>> This use of DT is just broken. Come up with another way.
>>
>>
>
>
> Can we have the DT binding very similar to IIO, clock, reset etc?
In what way? I'm guessing you mean to describe what controller a
connector is associated with. Certainly, some sort of phandle
reference will be needed. However. the node it points to is what needs
a lot of work first.
>
> Here is details for extcon-jack DT binding and its client:
>
> The client can get the cable information through its node or extcon name
> and once cable information is available, it can register for notification
> when state gets changed.
>
> The typical dt nodes are:
>
> Extcon-driver node:
>
> extcon: arizona-extcon {
> compatible = "wlf,arizona-extcon";
> #extcon-cells = <1>;
> };
>
>
>
> Driver need to specify the cable ID as
Unless you have cables hardwired to a board, please stop describing
cables in DT. Connectors!
> Cable ID
> ----------------------------
> Mechanical 0
> Microphone 1
> Headphone 2
> Line-out 3
No, please don't create some made up some number space. I don't see
why you need this. You should just need the phandle to "the microphone
jack" node.
> Here #extcon-cells is must and specifies the size of extcon cells. The
> client need to provide the driver specific information as argument along
> with handle.
>
>
> Extcon Client node:
>
> audio-controller@b0000 {
> ::::
> extcon-cables = <&extcon 1>, <&extcon 3>;
> extcon-cable-names = "Microphone", "Line-out";
> };
>
> and client driver can register the cable by passing the cable name
> as above along with its node.
>
> struct extcon_cable {
> struct extcon_dev *edev,
> int cable_id;
> };
If you are showing driver details to explain the binding, something is wrong.
>
> edev_mic_cable = extcon_get_extcon_cable(dev, "Microphone");
> extcon_register_notification(edev_mic_cable, notifier);
>
> edev_line_out_cable = extcon_get_extcon_cable(dev, "Line-out");
> extcon_register_notification(edev_line_out_cable, notifier);
Just remember that "*-names" should be optional (nor am I a fan of
adding -names everywhere). This can be defined as first entry is mic
and 2nd entry is line-out.
Rob
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