Messages in this thread | | | Date | Fri, 11 Jan 2013 10:09:19 -0700 | From | Stephen Warren <> | Subject | Re: [PATCH v2] input: Extend matrix-keypad device tree binding |
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On 01/10/2013 06:41 PM, Simon Glass wrote: > Some matrix keypad drivers can support different numbers of rows and > columns. Add a generic binding for these. > > Implementation note: > > In order to implement this binding in the kernel, we will need to modify > matrix_keypad_() to look up the number of rows and cols in > the keymap. Perhaps this could be done by passing 0 for these parameters? > Many of the parameters can already be set to NULL. Ick.
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Note that the Tegra bindings are based on matrix-keypad.txt, and recently added the following properties:
> - nvidia,kbc-row-pins: The KBC pins which are configured as row. This is an > array of pin numbers which is used as rows. > - nvidia,kbc-col-pins: The KBC pins which are configured as column. This is an > array of pin numbers which is used as column.
Those both define the number of rows/columns (indirectly via the property lengths) *and* define which pins are used for the rows/columns. How will this influence/interact-with any changes you're planning to the core matrix keymap parsing code; would Tegra require your "new" keypad,num-rows/keypad,num-columns properties even though the information is redundant, or will the Tegra driver have some way of passing this information to the core?
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