linux-kernel - Re: [PATCH] pwm-omap: handle timers not ready in probe

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Date:   Mon, 16 Jul 2018 11:47:58 -0400
From:   David Rivshin <drivshin@...rd.com>
To:     Pavel Machek <pavel@....cz>,
        Thierry Reding <thierry.reding@...il.com>
Cc:     Tony Lindgren <tony@...mide.com>,
        Sebastian Reichel <sre@...nel.org>,
        kernel list <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-omap@...r.kernel.org, nekit1000@...il.com, mpartap@....net,
        merlijn@...zup.org, linux-pwm@...r.kernel.org
Subject: Re: [PATCH] pwm-omap: handle timers not ready in probe

On Mon, 16 Jul 2018 10:37:20 +0200
Pavel Machek <pavel@....cz> wrote:

> On Mon 2018-07-16 00:57:40, Tony Lindgren wrote:
> > * Pavel Machek <pavel@....cz> [180716 07:16]:  
> > > 
> > > When all the drivers are built-in, timers are not ready and probing
> > > fails. Fix that with -EPROBE_DEFFER.
> > > 
> > > Signed-off-by: Pavel Machek <pavel@....cz>
> > > 
> > > diff --git a/drivers/pwm/pwm-omap-dmtimer.c b/drivers/pwm/pwm-omap-dmtimer.c
> > > index 665da3c..debeb70 100644
> > > --- a/drivers/pwm/pwm-omap-dmtimer.c
> > > +++ b/drivers/pwm/pwm-omap-dmtimer.c
> > > @@ -265,7 +271,7 @@ static int pwm_omap_dmtimer_probe(struct platform_device *pdev)
> > >  	timer_pdata = dev_get_platdata(&timer_pdev->dev);
> > >  	if (!timer_pdata) {
> > >  		dev_err(&pdev->dev, "dmtimer pdata structure NULL\n");
> > > -		ret = -EINVAL;
> > > +		ret = -EPROBE_DEFER;
> > >  		goto put;
> > >  	}  
> > 
> > There seems to be an earlier similar patch, care to take a look
> > at "[PATCH] pwm: pwm-omap-dmtimer: return -EPROBE_DEFER if no
> > dmtimer platform data"?  
> 
> Yes, that one is equivalent.
> 
> You can add
> 
> Acked-by: Pavel Machek <pavel@....cz>
> Tested-by: Pavel Machek <pavel@....cz>
> 
> on it.
> 
> Thanks,
> 									Pavel

Thanks Pavel. I hadn't been watching the Droid 4 threads, so I didn't 
see you were hitting the same problem. I'm assuming the patch will go
through the PWM tree, so copying in Thierry.