linux-kernel - Re: [PATCH v2 04/11] mfd:stixxxx-syscfg: Add ST System Configuration support.

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Date:	Mon, 10 Jun 2013 16:02:04 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org, srinivas.kandagatla@...com
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	"David S. Miller" <davem@...emloft.net>,
	Russell King - ARM Linux <linux@....linux.org.uk>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	Stephen Gallimore <stephen.gallimore@...com>,
	Rob Herring <rob.herring@...xeda.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Stuart Menefy <stuart.menefy@...com>,
	Mark Brown <broonie@...nel.org>,
	John Stultz <john.stultz@...aro.org>,
	"linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mauro Carvalho Chehab <mchehab@...hat.com>
Subject: Re: [PATCH v2 04/11] mfd:stixxxx-syscfg: Add ST System Configuration support.

On Monday 10 June 2013 14:52:38 Srinivas KANDAGATLA wrote:
> On 10/06/13 14:16, Linus Walleij wrote:
> > On Mon, Jun 10, 2013 at 11:22 AM, Srinivas KANDAGATLA
> > <srinivas.kandagatla@...com> wrote:
> > 
> >> This mfd driver provides higher level inialization routines for various
> >> IPs like Ethernet, USB, PCIE, SATA and so on. Also it provides way to
> >> get to syscfg registers via standard regmap api which is usefull for
> >> drivers like pinctrl.
> >>
> >> This patch adds support to ST System Configuration registers, which can
> >> be configured by the drivers.
> >>
> >> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...com>
> >> CC: Stuart Menefy <stuart.menefy@...com>
> >> CC: Stephen Gallimore <stephen.gallimore@...com>
> >> CC: Linus Walleij <linus.walleij@...aro.org>
> >> CC: Mark Brown <broonie@...nel.org>
> > 
> > What is this driver doing that drivers/mfd/syscon.c is not already
> > doing?
>
> As of now, the driver is very much similar to syscon + some additional
> functionality, but we are planning to use this file to add higher level
> functions to configure different IPs like ethernet, usb, power, reset
> and so on which are very much specific to ST System Configuration Registers.

I was expecting that you'd actually interface with the syscon code and
build on top, rather than copy it.

There are multiple ways of doing that, e.g. you could export a function
from syscon.c that you call to register the device node and then import
the regmap from syscon into your high-level driver again.

	Arnd
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