linux-kernel - Re: [PATCH 4/6] pinctrl: single: Add support for wake-up interrupts

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Date:	Fri, 11 Oct 2013 12:32:45 +0200
From:	Linus Walleij <linus.walleij@...aro.org>
To:	Roger Quadros <rogerq@...com>
Cc:	Tony Lindgren <tony@...mide.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Grygorii Strashko <grygorii.strashko@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Ujfalusi <peter.ujfalusi@...com>,
	Prakash Manjunathappa <prakash.pm@...com>,
	Haojian Zhuang <haojian.zhuang@...aro.org>,
	Benoît Cousson <bcousson@...libre.com>,
	Linux-OMAP <linux-omap@...r.kernel.org>
Subject: Re: [PATCH 4/6] pinctrl: single: Add support for wake-up interrupts

On Fri, Oct 11, 2013 at 10:56 AM, Roger Quadros <rogerq@...com> wrote:

> The register handling is fine. But how do we deal with resource handling?
> e.g. the block that has the deep-core registers might need to be clocked or powered
> before the registers can be accessed.

Yeah I saw this in the code there.

In this case it seems syscon-type regmap access can be used to
read/write the registers, so maybe the pin controller also need to
get a handle on some clock etc?

The general idea is however that large monolitic "drivers" for a
certain IO-range such as arch/arm/mach-omap2/prm3xxx.c
doesn't scale - we saw this with the Ux500 PRCMU driver in
mfd/* to the point that our patches to extend it were NACK:ed
until we refactor it. This stuff in mach-omap2 is in the same bad
design pattern, and need to get out of it.

The approach chosen for the Ux500 PRCMU was to distribute
out the driver into the places where it's actually used, like the
clock driver etc. The accessor functions to do some stuff over
in the PRCMU was just adding a layer of cruft.

Yours,
Linus Walleij
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