Message-ID: <513F3EF0.3030609@pengutronix.de>
Date: Tue, 12 Mar 2013 15:42:56 +0100
From: Marc Kleine-Budde <mkl@pengutronix.de>
Organization: Pengutronix e.K.
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To: Roger Quadros <rogerq@ti.com>
CC: balbi@ti.com, tony@atomide.com, mark.rutland@arm.com,
        linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org,
        linux-omap@vger.kernel.org, devicetree-discuss@lists.ozlabs.org
Subject: Re: [PATCH 1/8] usb: phy: nop: Add some parameters to platform data
References: <1363087466-32444-1-git-send-email-rogerq@ti.com> <1363087466-32444-2-git-send-email-rogerq@ti.com> <513F177D.40500@pengutronix.de> <513F37DD.9030301@ti.com> <513F38DF.5040404@pengutronix.de> <513F3B7E.8000002@ti.com>
In-Reply-To: <513F3B7E.8000002@ti.com>
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On 03/12/2013 03:28 PM, Roger Quadros wrote:
> On 03/12/2013 04:17 PM, Marc Kleine-Budde wrote:
>> On 03/12/2013 03:12 PM, Roger Quadros wrote:
>>> On 03/12/2013 01:54 PM, Marc Kleine-Budde wrote:
>>>> On 03/12/2013 12:24 PM, Roger Quadros wrote:
>>>>> Add clk_rate parameter to platform data. If supplied, the
>>>>> NOP phy driver will program the clock to that rate during probe.
>>>>>
>>>>> Also add 2 flags, needs_vcc and needs_reset.
>>>>> If the flag is set and the regulator couldn't be found
>>>>> then the driver will bail out with -EPROBE_DEFER.
>>>>
>>>> Is there a platform which fills out pdata.needs_vcc and
>>>> pdata.needs_reset? IMHO it makes no sense to add features for the no=
n DT
>>>> case, if there isn't any user for it.
>>>>
>>>
>>> There can be a user in the non DT case as well. Consider the followin=
g example:
>>
>> I'm just saying, let the implementation up to a real user for the non =
DT
>> case. Beagleboard is ARM and there's no point of implementing non DT
>> fall backs for ARM, IMHO.
>>
>=20
> Why do you say so?
>=20
> It doesn't depend on the CPU architecture. It depends on how the board =
designer
> wired the board. A non ARM platform could also face the same problem as=
 beagle.

Using -EPROBE_DEFER ist the way to solve the problem.

> It is not a non DT fallback. I believe many are still using non DT boot=
 and it
> needs to work at least till we move all functionality to purely DT.

=46rom my point of view, it makes no sense today to implement new feature=
s
which have a fallback for the non-DT case, if there isn't a real user of
this feature. So IMHO don't add needs_vcc and needs_reset flags to the
pdata, just take the information from the DT. As soon as there is a
non-DT user of this feature she/he can implement it or even better
switch to DT.

just my 2=A2,
Marc
--=20
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
Amtsgericht Hildesheim, HRA 2686  | http://www.pengutronix.de   |


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