linux-kernel - Re: [RFC] Does PHY UTMI data width belong to DWC2 or PHY binding?

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Message-ID: <20131022104829.GF15425@login.drsnuggles.stderr.nl>
Date:	Tue, 22 Oct 2013 12:48:29 +0200
From:	Matthijs Kooijman <matthijs@...in.nl>
To:	Kishon Vijay Abraham I <kishon@...com>
Cc:	Matt Porter <matt.porter@...aro.org>,
	Rob Herring <rob.herring@...xeda.com>,
	Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Stephen Warren <swarren@...dia.com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Paul Zimmerman <paulz@...opsys.com>,
	Devicetree List <devicetree@...r.kernel.org>,
	Linux USB List <linux-usb@...r.kernel.org>,
	Linux ARM Kernel List <linux-arm-kernel@...ts.infradead.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] Does PHY UTMI data width belong to DWC2 or PHY binding?

Hi Kishon,

On Mon, Oct 21, 2013 at 02:57:26PM +0530, Kishon Vijay Abraham I wrote:
> I think it makes sense to keep the data width property in the dwc2 node itself.
> I mean it describes how the dwc2 IP is configured in that particular SoC (given
> that it can be either <8> or <16>).
If I'm reading the RT3052 datasheet correctly (GHWCFG4 register), the IP
can be configured for 8, 16 or 8 _and_ 16. In the latter case, the "8
and 16 supported" would make sense as a property of dwc2 (though this
value should be autodetectable through GHWCFG4), while the actual 8 or
16 supported by the PHY would make sense as property of a phy.

Note sure if this is really useful in practice as well, or if just
setting the actual width to use on dwc2 makes more sense...

Gr.

Matthijs

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