netdev - Re: [PATCH 2/2 v3] net/smsc911x: Add regulator support

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Message-ID: <20111028203353.GE23421@pengutronix.de>
Date:	Fri, 28 Oct 2011 22:33:53 +0200
From:	Sascha Hauer <s.hauer@...gutronix.de>
To:	Linus Walleij <linus.walleij@...ricsson.com>
Cc:	netdev@...r.kernel.org,
	Steve Glendinning <steve.glendinning@...c.com>,
	Mathieu Poirer <mathieu.poirier@...aro.org>,
	Robert Marklund <robert.marklund@...ricsson.com>,
	Paul Mundt <lethal@...ux-sh.org>, linux-sh@...r.kernel.org,
	Tony Lindgren <tony@...mide.com>, linux-omap@...r.kernel.org,
	Mike Frysinger <vapier@...too.org>,
	uclinux-dist-devel@...ckfin.uclinux.org,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH 2/2 v3] net/smsc911x: Add regulator support

Hi Linus,

On Thu, Oct 27, 2011 at 02:48:11PM +0200, Linus Walleij wrote:
> From: Robert Marklund <robert.marklund@...ricsson.com>
> 
> Add some basic regulator support for the power pins, as needed
> by the ST-Ericsson Snowball platform that powers up the SMSC911
> chip using an external regulator.
> 
> Platforms that use regulators and the smsc911x and have no defined
> regulator for the smsc911x and claim complete regulator
> constraints with no dummy regulators will need to provide it, for
> example using a fixed voltage regulator. It appears that this may
> affect (apart from Ux500 Snowball) possibly these archs/machines
> that from some grep:s appear to define both CONFIG_SMSC911X and
> CONFIG_REGULATOR:
> 
> - ARM Freescale mx3 and OMAP 2 plus, Raumfeld machines
> - Blackfin
> - Super-H
> 

...

>  
> +
> +/*
> + * Request or free resources, currently just regulators.
> + *
> + * The SMSC911x has two power pins: vddvario and vdd33a, in designs where
> + * these are not always-on we need to request regulators to be turned on
> + * before we can try to access the device registers.
> + */
> +static int smsc911x_request_free_resources(struct platform_device *pdev,
> +		bool request)

I had to look twice at this function name. First I thought "request the
free resources?", which other resources would you request if not the
free ones? I think it would be nicer to have two functions instead.
Just my 2 cents.

Sascha


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