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

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Message-ID: <20121002125819.GY4360@opensource.wolfsonmicro.com>
Date:	Tue, 2 Oct 2012 13:58:20 +0100
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Felipe Balbi <balbi@...com>
Cc:	"ABRAHAM, KISHON VIJAY" <kishon@...com>,
	Sourav Poddar <sourav.poddar@...com>,
	devicetree-discuss@...ts.ozlabs.org,
	linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
	b-cousson@...com, santosh.shilimkar@...com, sameo@...ux.intel.com
Subject: Re: [PATCHv3 1/4] mfd: smsc: Add support for smsc gpio io/keypad
 driver

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.
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