linux-kernel - Re: [PATCH v7 5/9] ARM: OMAP: USB: Add phy binding information

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Message-ID: <51C040E8.2050904@ti.com>
Date:	Tue, 18 Jun 2013 16:43:44 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	<balbi@...com>
CC:	<grant.likely@...aro.org>, <tony@...mide.com>, <arnd@...db.de>,
	<swarren@...dia.com>, <sylvester.nawrocki@...il.com>,
	<linux-kernel@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-usb@...r.kernel.org>, <gregkh@...uxfoundation.org>,
	<akpm@...ux-foundation.org>, <rob.herring@...xeda.com>,
	<rob@...dley.net>, <b-cousson@...com>, <linux@....linux.org.uk>,
	<benoit.cousson@...aro.org>, <mchehab@...hat.com>,
	<cesarb@...arb.net>, <davem@...emloft.net>, <rnayak@...com>,
	<shawn.guo@...aro.org>, <santosh.shilimkar@...com>,
	<devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
	<nsekhar@...com>
Subject: Re: [PATCH v7 5/9] ARM: OMAP: USB: Add phy binding information

Hi,

On Tuesday 18 June 2013 03:57 PM, Felipe Balbi wrote:
> Hi,
>
> On Tue, Jun 18, 2013 at 03:34:36PM +0530, Kishon Vijay Abraham I wrote:
>> On Tuesday 18 June 2013 03:14 PM, Felipe Balbi wrote:
>>> On Thu, Jun 13, 2013 at 02:13:55PM +0530, Kishon Vijay Abraham I wrote:
>>>> In order for controllers to get PHY in case of non dt boot, the phy
>>>> binding information (phy device name) should be added in the platform
>>>> data of the controller.
>>>>
>>>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>>>
>>> I would rather not pass strings around, any other way to handle this ?
>>> Why do you need to pass this string ?
>>
>> Our old way of binding the controller and the phy using device name
>> started creating problems after the devices are created using
>> PLATFORM_DEVID_AUTO. Infact non-dt boot is broken in mainline for
>> OMAP3 platforms for which I have posted a RFC series
>> http://www.serverphorums.com/read.php?12,708632 which also uses
>> strings.
>> I'm not sure of any other way to deal with this.
>
> have you checked how other frameworks handle it ? Regulator has some
> sort of binding in board-files, but I guess it passes the regulator
> name?

 From whatever I could make of, regulator has 3 ways to get the 
regulator one of which is using the binding in board-files (but it also 
uses device name which could create the same problem that we are facing).

1.) from dt data
2.) from _supply_ name
3.) from binding in board file

(referred regulator_dev_lookup() in regulator/core.c)

Thanks
Kishon
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