[PATCH 1/2] ASoC: rockchip: Add machine driver for max98090 codec

Paul Bolle pebolle at tiscali.nl
Thu Jul 16 07:15:16 PDT 2015

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: {} \;

    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

then show up?


Paul Bolle

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