[PATCHv3 1/4] mfd: smsc: Add support for smsc gpio io/keypad driver

Felipe Balbi balbi at ti.com
Tue Oct 2 09:44:02 EDT 2012


On Tue, Oct 02, 2012 at 01:58:20PM +0100, Mark Brown wrote:
> On Tue, Oct 02, 2012 at 03:43:22PM +0300, Felipe Balbi wrote:
> > BTW, OTOH writing all children into the DT actually describes the HW,
> > no ? And depending on the device I feel it'd be better to write that
> Well, it depends on the hardware.  Some hardware has a bunch of nice,
> neat IPs which can usefully be reproduced and which map sensibly onto OS
> abstractions but a lot of it doesn't and frequently the abstractions
> which Linux wants to use don't bear a huge resemblance to the hardware
> (and Linux's ideas can change over time, as with the clock API being
> factored out for example).
> > data to DT. Think of twlxxxx (TI's PMICs), we might have completely
> > unrelated drivers using one of TWL's GPIO lines as an interrupt source.
> > If that particular children isn't listed in DT, it can't be used as an
> > interrupt-parent, right ?
> You can have the interrupt controller there without having to list every
> IP in the device, just make the parent device the interrupt controller
> to DT.

fair enough, thanks ;-)

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