linux-kernel - Re: [PATCH v2 2/2] drm: bridge: adv7511: Add support for ADV7535

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Date:   Tue, 20 Aug 2019 10:53:29 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Sam Ravnborg <sam@...nborg.org>
Cc:     "Togorean, Bogdan" <Bogdan.Togorean@...log.com>,
        "Laurent.pinchart@...asonboard.com" 
        <Laurent.pinchart@...asonboard.com>,
        "a.hajda@...sung.com" <a.hajda@...sung.com>,
        "airlied@...ux.ie" <airlied@...ux.ie>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "allison@...utok.net" <allison@...utok.net>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "matt.redfearn@...nci.com" <matt.redfearn@...nci.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>
Subject: Re: [PATCH v2 2/2] drm: bridge: adv7511: Add support for ADV7535

On Mon, Aug 19, 2019 at 12:46:16PM +0200, Sam Ravnborg wrote:
> Hi Bogdan.
> 
> > > >  		adv7533_detach_dsi(adv7511);
> > > >  	i2c_unregister_device(adv7511->i2c_cec);
> > > >  	if (adv7511->cec_clk)
> > > > @@ -1266,8 +1278,9 @@ static const struct i2c_device_id
> > > > adv7511_i2c_ids[] = {
> > > >  	{ "adv7511", ADV7511 },
> > > >  	{ "adv7511w", ADV7511 },
> > > >  	{ "adv7513", ADV7511 },
> > > > -#ifdef CONFIG_DRM_I2C_ADV7533
> > > > +#ifdef CONFIG_DRM_I2C_ADV753x
> > > >  	{ "adv7533", ADV7533 },
> > > > +	{ "adv7535", ADV7535 },
> > > >  #endif
> > > 
> > > This ifdef may not be needed??
> > > If we did not get this type we will not look it up.
> > But if we have defined in DT adv7533/5 device but
> > CONFIG_DRM_I2C_ADV753x not selected probe will fail with ENODEV. That
> > would be ok?
> 
> What do we gain from this complexity in the end.
> Why not let the driver always support all variants.
> 
> If this result in a simpler driver, and less choices in Kconfig
> then it is a win-win.

Yeah in general we don't Kconfig within drivers in drm to disable specific
code-paths. It's not worth the pain.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch