[PATCH 2/2] input: samsung-keypad: Add device tree support
thomas.abraham at linaro.org
Wed Sep 14 14:09:03 EDT 2011
On 14 September 2011 22:43, Grant Likely <grant.likely at secretlab.ca> wrote:
> On Wed, Sep 14, 2011 at 10:19:22PM +0530, Thomas Abraham wrote:
>> Hi Grant,
>> On 14 September 2011 21:41, Grant Likely <grant.likely at secretlab.ca> wrote:
>> > On Tue, Sep 13, 2011 at 05:56:19PM +0530, Thomas Abraham wrote:
>> >> Add device tree based discovery support for Samsung's keypad controller.
>> >> Cc: Joonyoung Shim <jy0922.shim at samsung.com>
>> >> Cc: Donghwa Lee <dh09.lee at samsung.com>
>> >> Signed-off-by: Thomas Abraham <thomas.abraham at linaro.org>
>> >> ---
>> >> .../devicetree/bindings/input/samsung-keypad.txt | 88 ++++++++++
>> >> drivers/input/keyboard/samsung-keypad.c | 177 ++++++++++++++++++--
>> >> 2 files changed, 253 insertions(+), 12 deletions(-)
>> >> create mode 100644 Documentation/devicetree/bindings/input/samsung-keypad.txt
>> >> +- Keys represented as child nodes: Each key connected to the keypad
>> >> + controller is represented as a child node to the keypad controller
>> >> + device node and should include the following properties.
>> >> + - keypad,row: the row number to which the key is connected.
>> >> + - keypad,column: the column number to which the key is connected.
>> >> + - keypad,key-code: the key-code to be reported when the key is pressed
>> >> + and released.
>> > What defines the meanings of the key codes?
>> The key-code could be any value which the system would want the keypad
>> driver to report when that key is pressed.
> Are they linux keycodes? If so, then this property name can
> probably be linux,code. There is already precedence for that
> usage in Documentation/devicetree/bindings/gpio/gpio-keys.txt. (I
> would personally prefer "linux,key-code", but sometimes it is better
> to go with existing precidence) You could also use linux,input-type as
> specified in that binding.
Ok. For linux, "keypad,key-code" would mean linux keycodes. The
property name 'keypad,key-code' was chosen since it can be reused on
non-linux platforms as well. I did have a look at
Documentation/devicetree/bindings/gpio/gpio-keys.txt while doing this,
but preferred using 'keypad,key-code' since it would be generic. Given
a choice, I would like to retain this.
>> >> +
>> >> +Optional Properties specific to linux:
>> >> +- linux,keypad-no-autorepeat: do no enable autorepeat feature.
>> >> +- linux,keypad-wakeup: use any event on keypad as wakeup event.
>> > Is this really a linux-specific feature?
>> Yes, it is a property defined by the linux subsystems. A non-linux
>> system might not have such features.
> I was specifically referring to the wakeup property, but okay, I can
> see the argument that it is linux-specific because it is usage-policy
Thanks for your review.
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