linux-kernel - Re: [PATCH RFC leds + net-next v3 2/2] net: phy: marvell: add support for PHY LEDs via LED class

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Message-ID: <20200807091119.b7vcdk4fxz7le3zp@duo.ucw.cz>
Date:   Fri, 7 Aug 2020 11:11:19 +0200
From:   Pavel Machek <pavel@....cz>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Marek Behun <marek.behun@....cz>, netdev@...r.kernel.org,
        linux-leds@...r.kernel.org, jacek.anaszewski@...il.com,
        Dan Murphy <dmurphy@...com>,
        Ondřej Jirman <megous@...ous.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
        Gregory Clement <gregory.clement@...tlin.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC leds + net-next v3 2/2] net: phy: marvell: add
 support for PHY LEDs via LED class

On Sat 2020-07-25 20:48:46, Andrew Lunn wrote:
> > > > +#if 0
> > > > +	/* LED_COLOR_ID_MULTI is not yet merged in Linus' tree */
> > > > +	/* TODO: Support DUAL MODE */
> > > > +	if (color == LED_COLOR_ID_MULTI) {
> > > > +		phydev_warn(phydev, "node %pOF: This driver does not yet support multicolor LEDs\n",
> > > > +			    np);
> > > > +		return -ENOTSUPP;
> > > > +	}
> > > > +#endif  
> > > 
> > > Code getting committed should not be using #if 0. Is the needed code
> > > in the LED tree? Do we want to consider a stable branch of the LED
> > > tree which DaveM can pull into net-next? Or do you want to wait until
> > > the next merge cycle?
> > 
> > That's why this is RFC. But yes, I would like to have this merged for
> > 5.9, so maybe we should ask Dave. Is this common? Do we also need to
> > tell Pavel or how does this work?
> 
> The Pavel needs to create a stable branch. DaveM then merges that
> branch into net-next. Your patches can then be merged. When Linus
> pulls the two branches, led and net-next, git sees the exact same
> patches twice, and simply drops them from the second pull request.
> 
> So you need to ask Pavel and DaveM if they are willing to do this.

Multicolor should be upstream now, so I believe this is no longer
required?

> > I also want this code to be generalized somehow so that it can be
> > reused. The problem is that I want to have support for DUAL mode, which
> > is Marvell specific, and a DUAL LED needs to be defined in device tree.
> 
> It sounds like you first need to teach the LED core about dual LEDs
> and triggers which affect two LEDs..

Umm. Yes, triggers for controlling both intensity and hue will be
interesting. Suggestions welcome.

Best regards,
								Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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