linux-kernel - Re: [PATCH 1/1 RFC] net/phy: Add Lantiq PHY driver

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Message-ID: <8983627.qbi7VGpM7G@ws-stein>
Date:	Mon, 23 May 2016 11:49:36 +0200
From:	Alexander Stein <alexander.stein@...tec-electronic.com>
To:	"Mehrtens, Hauke" <hauke.mehrtens@...el.com>
Cc:	Mathias Kresin <openwrt@...sin.me>,
	John Crispin <john@...ozen.org>,
	Florian Fainelli <f.fainelli@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"andrew@...n.ch" <andrew@...n.ch>,
	Hauke Mehrtens <hauke@...ke-m.de>
Subject: Re: [PATCH 1/1 RFC] net/phy: Add Lantiq PHY driver

Hi Hauke,

On Monday 23 May 2016 09:12:54, Mehrtens, Hauke wrote:
> > On Thursday 19 May 2016 12:03:10, Mathias Kresin wrote:
> > > 2016-05-19 9:03 GMT+02:00 John Crispin <john@...ozen.org>:
> > > > On 19/05/2016 08:57, Alexander Stein wrote:
> > > >> Thanks for the link, I wasn't aware of that patch. I like it in
> > > >> general, but there are some things I'd like to get addressed first:
> > > >> * vr9_gphy_of_reg_init() writes uncoditionally to led3h and led3l
> > > >> even on
> > > >> 
> > > >>   PEf7071 which does not have this register at all
> > > > 
> > > > we use this driver mainly on the 11g and 22f version. mathias
> > > > recently added the led3 handling.
> > > > 
> > > > @Mathias, can you have a look at this and fix it inside the lede tree
> > > > ?
> > > 
> > > Well, I haven't added the led3 handling, I've only changed the initial
> > > value (function) of led3.
> > > 
> > > Maybe it's cleaner to not use a default value for the led function and
> > > completely rely on the device tree bindings. But by adjusting the
> > > initial values, I had to change only the led function of one board in
> > > the openwrt xrx200 subtarget instead of touching all dts files.
> > 
> > I think setting default values is good.
> 
> The registers are set to some reset values after the chip is coming out of
> reset, but we should set  them all to the same value, Mathias said that all
> except for one board he knows are using only one LED per port, but they are
> often using different LED pins, I will change my patch.

One LED per port? I would think of using one RJ45 socket per port which 
usually have 2 LEDs.

> > > I know that the LTQ Datasheet for the PEF 7071 Version 1.5 mentions
> > > the led3 control register albeit there is no pin for a forth led. So I
> > > guess it's safe to write to the led3 register even for the PEF 7071.
> > 
> > Mh, my PEF 7071 User Manual (Version 2.0, 2012-10-17) doesn't mention
> > LED3x registers. There is LED3DA and LED3EN in PHY_LED but was removed in
> > 1.6 manual.
> 
> LED3x is only available in PEF 7072 which is a different package with more
> pins for the LED3 and some other interfaces.
> > I think, some flag if the PHY supports LED3 and depend on that is just
> > fine.
> I do not know how to distinguish between PEF 7071 and PEF 7072.

I expected that PEF 7072 would have a different PHY ID, but apparently this is 
not the case, though I don't have a datasheet for 7072. Is there really no way 
to distinguish those two?

Alexander