linux-kernel - Re: [PATCH v2 1/5] phy: Add a driver for simple phy

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Date:	Sat, 16 Apr 2016 21:50:26 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	Alban Bedel <albeu@...e.fr>, linux-mips@...ux-mips.org,
	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>,
	Ralf Baechle <ralf@...ux-mips.org>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/5] phy: Add a driver for simple phy

On Thursday 14 April 2016 11:22:58 Kishon Vijay Abraham I wrote:
> 
> IMO simple-phy driver should be an independent driver and shouldn't export
> symbols. The dt binding for the simple phy device should be something like
> below where all the properties of the simple phy device should be in the
> binding documentation.
> usbphy {
>         compatible = "simple-phy";
>         phy-supply = <&supply>;
>         clocks = <&clock>;
>         reset = <&reset>;
> };
> 
> Anything that needs more than this shouldn't be a simple phy.

I think there are two aspects here:

a) I agree that a driver that matches "simple-phy" should only call
   the generic functions and not use any other properties.

b) Independent of that, I think that it makes a lot of sense to export
   those functions from the generic PHY subsystems so they can be
   called from drivers that are a little less generic, or that already
   have an established binding but need no other code.

	Arnd