Date: Tue, 2 Oct 2012 16:44:02 +0300
From: Felipe Balbi <balbi@ti.com>
To: Mark Brown <broonie@opensource.wolfsonmicro.com>
Cc: Felipe Balbi <balbi@ti.com>, "ABRAHAM, KISHON VIJAY" <kishon@ti.com>,
        Sourav Poddar <sourav.poddar@ti.com>,
        devicetree-discuss@lists.ozlabs.org,
        linux-arm-kernel@lists.infradead.org, linux-omap@vger.kernel.org,
        linux-kernel@vger.kernel.org, linux-input@vger.kernel.org,
        b-cousson@ti.com, santosh.shilimkar@ti.com, sameo@linux.intel.com
Subject: Re: [PATCHv3 1/4] mfd: smsc: Add support for smsc gpio io/keypad
 driver
Message-ID: <20121002134400.GA12125@arwen.pp.htv.fi>
Reply-To: balbi@ti.com
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 <20121001114454.GA9170@sirena.org.uk>
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 <20121001120907.GK4360@opensource.wolfsonmicro.com>
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Hi,

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:
>=20
> > 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
>=20
> 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).
>=20
> > 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.
>=20
> > If that particular children isn't listed in DT, it can't be used as an
> > interrupt-parent, right ?
>=20
> 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 ;-)

--=20
balbi

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