linux-kernel - Re: [PATCH v2 3/5] regulator: add bcm590xx regulator driver

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Message-ID: <20140219045232.GD2669@sirena.org.uk>
Date:	Wed, 19 Feb 2014 13:52:32 +0900
From:	Mark Brown <broonie@...nel.org>
To:	Matt Porter <mporter@...aro.org>
Cc:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Christian Daudt <bcm@...thebug.org>,
	Devicetree List <devicetree@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 3/5] regulator: add bcm590xx regulator driver

On Tue, Feb 18, 2014 at 06:17:10PM -0500, Matt Porter wrote:

> +static struct of_device_id bcm590xx_of_match[] = {
> +	{ .compatible = "brcm,bcm59056-regs", },
> +	{ }
> +};

This looks pretty much OK however I am in general suspicious of MFDs
that have subdevices like this in the DT - it doesn't seem like this is
a reusable device which can appear anywhere else so you're pretty much
just representing the way that Linux splits things up here rather than a
reusable IP that can reasonably have a separate binding.

If you had a binding which did something like enumerate the individual
IP blocks as individual devices that'd be more interesting, I could see
for example that a different PMIC might have a different set of register
compatible regulator IPs laid out.  It looks like that might be doable,
but it's in no way essential.

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