Re: [PATCHv4 1/2] drivers: input: keypad: Add device tree support

Poddar, Sourav
2012-04-25T13:00:43Z

Hi Roland,

On Wed, Apr 25, 2012 at 5:45 PM, Roland Stigge <stigge@antcom.de> wrote:
> Hi!
>
> On 04/25/2012 01:56 PM, Poddar, Sourav wrote:
>> Even I was using the bindings as used by samsung-keypad driver. But according
>> to the comments and logically too, we should use the common matrix keyboard
>> bindings already descibed in
>> Documentation/devicetree/bindings/input/matrix-keymap.txt.
>
> Fine with me. Can switch over to
> Documentation/devicetree/bindings/input/matrix-keymap.txt
>
> Maybe samsung-keypad should also be converted because it's subnodes
> structure duplicates exactly the same thing (row,col,code) in a
> different way, and we both were distracted by it, ignoring
> matrix-keymap.txt? Or is it already too late (both samsung-keypad and

Not sure about the standards, but surely have seen few others like tegra
keyboards using common matrix-keyboard bindings.

One more comment which I saw in some other mail thread about
using the following
key_1 {
keypad,row = <0>;
keypad,column = <3>;
linux,code = <2>;
};
is that when there are too many keys, the whole data become quilte huge.
These problem get sorted out on using matrix-keymap bindings, since there
is a single value computed in order to describe a particular key.

~Sourav

> matrix-keypad both being standards in use) and we should put a
> recommendation into one of them to use the other one for new designs?
>

> Thanks,
>
> Roland
>