linux-kernel - Re: [PATCH v2 3/9] of: Update Tegra XUSB pad controller binding for USB

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Message-ID: <53FE0A6B.8000607@wwwdotorg.org>
Date:	Wed, 27 Aug 2014 10:42:19 -0600
From:	Stephen Warren <swarren@...dotorg.org>
To:	Andrew Bresticker <abrestic@...omium.org>
CC:	Thierry Reding <thierry.reding@...il.com>,
	"linux-tegra@...r.kernel.org" <linux-tegra@...r.kernel.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>,
	Russell King <linux@....linux.org.uk>,
	Jassi Brar <jassisinghbrar@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Mathias Nyman <mathias.nyman@...el.com>,
	Grant Likely <grant.likely@...aro.org>,
	Alan Stern <stern@...land.harvard.edu>,
	Arnd Bergmann <arnd@...db.de>,
	Kishon Vijay Abraham I <kishon@...com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>
Subject: Re: [PATCH v2 3/9] of: Update Tegra XUSB pad controller binding for
 USB

On 08/27/2014 10:36 AM, Andrew Bresticker wrote:
> On Mon, Aug 25, 2014 at 12:12 PM, Stephen Warren <swarren@...dotorg.org> wrote:
>> On 08/18/2014 11:08 AM, Andrew Bresticker wrote:
>>>    - #phy-cells: Should be 1. The specifier is the index of the PHY to
>>> reference.
>>>      See <dt-bindings/pinctrl/pinctrl-tegra-xusb.h> for the list of valid
>>> values.
>>> +- mboxes: Must contain an entry for the XUSB PHY mailbox channel.
>>> +  See ../mailbox/mailbox.txt for details.
>>
>>
>> Can we require the mbox-names property here, so that everything is looked up
>> by names. I know that the proposed mbox binding states that using indexes is
>> preferred over names, but that's just silly considering that names are
>> widely used in most other similar bindings, and are much easier to extend in
>> a backwards compatible fashion in the face of optional entries. As such, I'd
>> prefer that all Tegra bindings use foo-names properties where they exist.
>
> Sure, will do.
>
>>> +Optional properties:
>>> +-------------------
>>> +- vbus-otg-{0,1,2}-supply: VBUS regulator for the corresponding UTMI pad.
>>
>>
>> Why "-otg"? It's quite possible to have a regulator for VBUS even on systems
>> that don't support OTG, but rather simply have the ability to turn VBUS off.
>
> Because they're the VBUS supplies for the OTG 'lanes'.  It doesn't
> really add anything, so I'll omit the "-otg".

Ah right. In that case, if the lanes are named "OTG" lanes in the HW 
docs, I'm happy either way. If you did decide to keep the "-otg", 
rewording as "VBUS regulator for the corresponding OTG UTMI pad" would 
make the meaning clearer.
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