linux-kernel - Re: [PATCH 1/2] ASoC: rockchip: Add machine driver for max98090 codec

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Date:	Thu, 16 Jul 2015 18:22:45 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	Mark Brown <broonie@...nel.org>
Cc:	Xing Zheng <zhengxing@...k-chips.com>, dgreid@...omium.org,
	dianders@...omium.org, heiko@...ech.de, sonnyrao@...omium.org,
	linux-rockchip@...ts.infradead.org,
	Liam Girdwood <lgirdwood@...il.com>,
	Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.de>,
	linux-kernel@...r.kernel.org, alsa-devel@...a-project.org,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 1/2] ASoC: rockchip: Add machine driver for max98090
 codec

On do, 2015-07-16 at 16:05 +0100, Mark Brown wrote:
> Why would this not be the case - what is the difference you beleive
> this driver has to other platform drivers?

It's my believe that for MODULE_ALIAS("platform:[...]") to be useful
there needs to be corresponding struct platform_device. For this patch
that would be a platform device named "rockchip-snd-max98090". (This is
something that I try to check rather carefully, because these devices
can be generated on the fly.)

I'm happy to drop this believe if someone shows me another way that
MODULE_ALIAS("platform:[...]") can actually be used.

So, in short, the difference between this driver and other platform
drivers is that, as far as I'm aware, this platform driver lacks a
corresponding platform device. Probably because OF support suffices to
get this module autoloaded.

Thanks,

Paul Bolle
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