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

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Message-ID: <1437056116.28351.19.camel@tiscali.nl>
Date:	Thu, 16 Jul 2015 16:15:16 +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 13:55 +0100, Mark Brown wrote:
> No, in that case you've not understood what the MODULE_ALIAS is
> for.  It's there so that userspace knows which module to load if it 
> gets
> a device with no driver, it goes in the driver not in the code
> registering the device.

That's exactly how I understood MODULE_ALIAS() to work.

And it works, in short, because a platform device fires a
"MODALIAS=platform:[...]" uevent when it's created. And userspace uses
that uevent to load the module carrying that alias.

Let's put it this was. If one does
    sudo find /sys -perm -o=r -name uevent -exec grep -H MODALIAS=platform: {} \;

or
    sudo find /sys -perm -o=r -name modalias -exec grep -H platform: {} \;

(both lists should be similar)

on the systems this patch is targeting, will
   platform:rockchip-snd-max98090

then show up?

Thanks,


Paul Bolle
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