Re: [PATCH v5 4/6] drm: bridge/dw_hdmi-i2s-audio: add audio driver

Yakir Yang
2015-06-23T03:06:47Z

Paul,

在 2015/6/22 18:06, Paul Bolle 写道:
> Something I didn't notice in v4, sorry.
>
> On Sat, 2015-06-20 at 00:28 +0800, Yakir Yang wrote:
>> --- /dev/null
>> +++ b/drivers/gpu/drm/bridge/dw_hdmi-i2s-audio.c
>> +#define DRIVER_NAME "dw-hdmi-i2s-audio"
>> +MODULE_ALIAS(PLATFORM_MODULE_PREFIX DRIVER_NAME);
> 0) Side note: this is the first time that PLATFORM_MODULE_PREFIX is used
> inside MODULE_ALIAS(). But none of the 1000+ other "platform:" aliases
> do that. And neither does 5/6 of this series! That suggests, I think,
> that this shouldn't be done.
>
> You could consider adding something like
> #define MODULE_ALIAS_PLATFORM(NAME) MODULE_ALIAS(PLATFORM_MODULE_PREFIX NAME)
>
> But then, I think, all the current 1000+ platform: aliases should be
> converted to that macro. Would that be worth it?
Yeah, It would be horrible to coverted to that macro ;)

> 1) Now on to my remark: this alias seems to be only useful if there also
> is a struct platform_device with a "dw-hdmi-i2s-audio" name. Because
> that platform_device would, badly summarized, fire of a
> "MODALIAS=platform:dw-hdmi-i2s-audio" uevent when created. Which, in its
> turn, would trigger userspace to load this module, correct?
>
> But I think there's no platform_device with a "dw-hdmi-i2s-audio" name.
> So I wonder whether this MODULE_ALIAS() is actually needed. What breaks
> if you leave it out?
Thanks for your attentive comment . Actually there should be an
platform device that named "dw-hdmi-i2s-audio" which I misspelt in
dw_hdmi.c driver.

thanks,
- Yakir

> (Likewise for 5/6, but there the platform_device should have a
> "rockchip-hdmi-audio" name.)
>
> Thanks,
>
>
> Paul Bolle
>
>
>
>