linux-kernel - Re: [PATCHv4 2/6] phy: improved lookup method

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Message-ID: <546C2B9E.3030204@ti.com>
Date:	Wed, 19 Nov 2014 11:03:18 +0530
From:	Kishon Vijay Abraham I <kishon@...com>
To:	Heikki Krogerus <heikki.krogerus@...ux.intel.com>
CC:	Vivek Gautam <gautamvivek1987@...il.com>,
	Vivek Gautam <gautam.vivek@...sung.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux USB Mailing List <linux-usb@...r.kernel.org>,
	<andrew.kim@...el.com>
Subject: Re: [PATCHv4 2/6] phy: improved lookup method

Hi,

On Tuesday 18 November 2014 09:06 PM, Heikki Krogerus wrote:
> On Tue, Nov 18, 2014 at 10:49:18AM +0530, Kishon Vijay Abraham I wrote:
>> On Monday 17 November 2014 09:10 PM, Heikki Krogerus wrote:
>>> On Thu, Nov 13, 2014 at 07:03:01PM +0530, Vivek Gautam wrote:
>>>> How about adding the change in attached patch [1] on top of this patch.
>>>> Just introduced the phy pointer in "phy_lookup" structure, and
>>>> modified phy_find() accordingly.
>>>
>>> I would be fine if we used the phy pointer to match, but if we have
>>> the pointer to the phy in the lookup, then I would say we need to
>>> remove the phy_name member.
>>>
>>> Otherwise we would have to support two ways of finding the lookups
>>> (one for the "static" lookups where we match to the phy_name and other
>>> where we match to the pointer). That means we will also not be able to
>>> create "static" lookups, but those would be only needed if we wanted to
>>> create them in board files. I don't think there will ever be need to
>>> create the lookups in board files, so I'm more then happy to remove
>>> the static way of creating the lookups.
>>
>> Just using the phy pointer sounds good. But interested to know where the phy
>> pointer will be added to the lookup table.
> 
> I'm making assumption that there will not be any (new) platforms where
> the bindings are not provided in HW descriptions like dt or ACPI
> tables. That leaves the lookups to be useful only in cases where a
> driver has to, for whatever reason, pass it's phy's forward, like
> dwc3 host. ULPI will be an other case where we will need to use them.

right.
> 
> Now the only user for the lookups is twl4030-usb, but since it's
> actually just ULPI type PHY in cases where we have platform data to
> deal with (please correct me if I'm wrong), I think we could later

you mean passing consumer information using platform data?
> remove it's need for platform data completely with the help of the
> ULPI bus I'm working with.

Sure.

Thanks
Kishon
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