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

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Message-ID: <55A865B5.7020609@rock-chips.com>
Date:	Fri, 17 Jul 2015 10:17:25 +0800
From:	zhengxing <zhengxing@...k-chips.com>
To:	Paul Bolle <pebolle@...cali.nl>
CC:	Mark Brown <broonie@...nel.org>, 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

Hi Paul,
On 2015年07月16日 22:15, Paul Bolle wrote:
>
> 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
>
Thank you for your patience and detailed explanation.
I tested your two ways and didn't find the 
"platform:rockchip-snd-max98090" in my device(kernel v3.14), and the 
driver path is:
localhost rockchip-snd-max98090 # pwd
/sys/bus/platform/drivers/rockchip-snd-max98090

Thanks.

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