linux-kernel - Re: Use of pinctrl-single for external device over I2C

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Date:	Wed, 24 Jun 2015 06:33:50 -0700
From:	Tony Lindgren <tony@...mide.com>
To:	Vaibhav Hiremath <vaibhav.hiremath@...aro.org>
Cc:	Linus Walleij <linus.walleij@...aro.org>, lee.jones@...aro.org,
	sameo@...ux.intel.com, linux-gpio@...r.kernel.org,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Use of pinctrl-single for external device over I2C

* Vaibhav Hiremath <vaibhav.hiremath@...aro.org> [150624 05:06]:
> On Tuesday 23 June 2015 04:25 PM, Vaibhav Hiremath wrote:
> >
> >/*
> >  * REVISIT: Reads and writes could eventually use regmap or something
> >  * generic. But at least on omaps, some mux registers are performance
> >  * critical as they may need to be remuxed every time before and after
> >  * idle. Adding tests for register access width for every read and
> >  * write like regmap is doing is not desired, and caching the registers
> >  * does not help in this case.
> >  */
> >
> >
> >Should be not have flag for this and use regmap_ variants? If we
> >implement flag based approach then same driver can be reused for pinmux
> >configuration of external device.

Nothing stopping you from adding regmap support to it. It just needs
to be made optional as the users so far don't need it.

Regards,

Tony
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