Re: [PATCH] Input: matrix-keypad - support binary column select gpios

HI Anatolij,

On Tue, Jan 29, 2013 at 01:25:24PM +0100, Anatolij Gustschin wrote:

On hardware with limited gpios one column select gpio can select
two different rows when using some additional hardware logic:
high value selects one row, low value selects another row. Add
support for such matrix keyboards and document device tree
bindings used to describe them.

Since half of the columns is always not selected, interrupts won't be
generated for press events on these columns. To generate interrupts
for not selected columns we need to periodicaly switch to these columns
in order to catch the potential press events. This is done by additional
work function.

So this effectively switches the driver from interrupt driven to polled
model, right? The device does not really need an interrupt anymore...

Thanks.

-- 
Dmitry