linux-kernel - Re: Re[12]: [PATCH v3] mfd: syscon: Add non-DT support

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Date:	Wed, 20 Feb 2013 17:16:04 +0000
From:	Arnd Bergmann <arnd@...db.de>
To:	Alexander Shiyan <shc_work@...l.ru>
Cc:	Dong Aisheng <dong.aisheng@...aro.org>,
	linux-kernel@...r.kernel.org, Samuel Ortiz <sameo@...ux.intel.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: Re: Re[12]: [PATCH v3] mfd: syscon: Add non-DT support

On Wednesday 20 February 2013, Alexander Shiyan wrote:
> No. Target have a three SYSCON registers and two SYSFLG. All these registers
> can be combined into three syscon devices.
> Only these registers will be handled via syscon device, so it is not only one.
> Or you mean about handle all register via syscon? It is not it.

Yes, I was expecting that you would list all three pages in the resource
for the syscon device, basically making all of the core clps711x
registers available this way.

> > treat the absence of DT information as an error, and a call to
> > syscon_regmap_lookup_by_compatible or syscon_regmap_lookup_by_phandle
> > will always return the syscon device that was registered first, or
> > -EPROBE_DEFER for any error.
> 
> The initial idea is search desired syscon device from drivers only by one function
> (i.e. search syscon device by compatible string or by specific alias) and no depend
> on DT or non-DT. I.e. define syscon device always at machine start (even if we run
> machine from DTS), because device should be always present in system.

I don't understand yet what the advantage for clps711x is over just a single
register area that would get registered at boot time and replace all the
clps_readl/clps_writel calls.

	Arnd
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