linux-kernel - Re: [PATCH] net: phy: at803x: don't depend on GPIOLIB

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Date:	Fri, 18 Mar 2016 21:44:21 +0100
From:	Mason <slash.tmp@...e.fr>
To:	Uwe Kleine-Koenig <u.kleine-koenig@...gutronix.de>
Cc:	Sebastian Frias <sf84@...oste.net>,
	Daniel Mack <daniel@...que.org>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	lkml <linux-kernel@...r.kernel.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	Mans Rullgard <mans@...sr.com>,
	Fabio Estevam <festevam@...il.com>,
	Martin Blumenstingl <martin.blumenstingl@...il.com>,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [PATCH] net: phy: at803x: don't depend on GPIOLIB

On 18/03/2016 21:11, Uwe Kleine-König wrote:

> Hello,
> 
> On Fri, Mar 18, 2016 at 08:31:20PM +0100, Mason wrote:
>
>> On 18/03/2016 20:12, Uwe Kleine-König wrote:
>>
>>> On Fri, Mar 18, 2016 at 04:56:21PM +0100, Sebastian Frias wrote:
>>>
>>>> What would you think of making at803x_link_change_notify() print a
>>>> message every time it should do a reset but does not has a way to do it?
>>>
>>> Then this question is obsolete because the device doesn't probe.
>>
>> I don't understand this statement.
>>
>> What does it mean for a question to be obsolete?
> 
> If the driver doesn't probe because it cannot control the reset line,
> you don't need to think about how it should behave in
> at803x_link_change_notify without control of the reset line, because
> this code isn't reached then.

If I understand correctly, it is possible to soft-reset the PHY
by writing to a specific register. The GPIO pin is useful only to
force a hardware-reset when the PHY is wedged by some random event.

(Or am I completely off the mark?)

Regards.