linux-kernel - Re: [PATCH 1/2] regulator: Add brcm,bcm63xx-regulator device tree binding

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Date:	Wed, 2 Dec 2015 12:53:25 +0000
From:	Mark Brown <broonie@...nel.org>
To:	Simon Arlott <simon@...e.lp0.eu>
Cc:	devicetree@...r.kernel.org, Liam Girdwood <lgirdwood@...il.com>,
	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>,
	linux-kernel@...r.kernel.org,
	Florian Fainelli <f.fainelli@...il.com>,
	Jonas Gorski <jogo@...nwrt.org>
Subject: Re: [PATCH 1/2] regulator: Add brcm,bcm63xx-regulator device tree
 binding

On Wed, Dec 02, 2015 at 12:45:50PM -0000, Simon Arlott wrote:
> On Tue, December 1, 2015 22:16, Mark Brown wrote:

> > Why are these in the DT, I would expect that if this is a driver for a
> > specific SoC all these properties would be known as a result of that.

> This is a driver for multiple SoCs with the same regulator control in
> different places on different SoCs, so the location of it within the misc
> register needs to be provided in the DT:

> BCM6362:
>   #define MISC_BASE 0xb0001800 /* Miscellaneous Registers */
>   uint32 miscIddqCtrl; /* 0x48 */

This is the sort of thing you can pick up from the SoC compatible
strings.  As things stand there is zero content in this driver that
relates to this SoC.

> The mask is used as there's one bit per regulator in the register, but
> there's more than one way to express this in the DT:

I wouldn't expect to see it in the device tree at all for a device
specific driver.

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