linux-kernel - Re: [PATCH v2 1/9] phy: add phy_get_bus_width()/phy_set_bus

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Date:	Sat, 02 Nov 2013 14:14:59 +0100
From:	Tomasz Figa <tomasz.figa@...il.com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Matt Porter <matt.porter@...aro.org>, Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Kishon Vijay Abraham I <kishon@...com>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Kumar Gala <galak@...eaurora.org>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Christian Daudt <bcm@...thebug.org>,
	Paul Zimmerman <paulz@...opsys.com>,
	Devicetree List <devicetree@...r.kernel.org>,
	Linux USB List <linux-usb@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linaro Patches <patches@...aro.org>
Subject: Re: [PATCH v2 1/9] phy: add phy_get_bus_width()/phy_set_bus_width() calls

Hi Matt,

On Friday 01 of November 2013 15:45:50 Matt Porter wrote:
> This adds a pair of APIs that allows the generic PHY subsystem to
> provide information on the PHY bus width. The PHY provider driver may
> use phy_set_bus_width() to set the bus width that the PHY supports.
> The controller driver may then use phy_get_bus_width() to fetch the
> PHY bus width in order to properly configure the controller.

I somehow does not like this. If we take this path for any further 
properties that we may need, we will end up with a lot of consumer 
specific properties stored in a PHY object having their own accessor 
functions.

Since this is just an integration detail, what about simply adding this as 
a property in device tree node of the OTG controller (and pdata if 
considering non-DT support)?

Another option would be some framework for retrieving arbitrary properties 
from the PHY, but I'm not really sure there is a need for such.

Best regards,
Tomasz

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