linux-kernel - Re: musb as module broken in 2.6.38

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Message-ID: <4D809455.9060901@ahsoftware.de>
Date:	Wed, 16 Mar 2011 11:43:33 +0100
From:	Alexander Holler <holler@...oftware.de>
To:	Felipe Balbi <balbi@...com>
CC:	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: musb as module broken in 2.6.38

Am 16.03.2011 11:38, schrieb Felipe Balbi:
> hi,
>
> On Mar 16, 2011, at 12:30 PM, Alexander Holler wrote:
>> Am 16.03.2011 11:24, schrieb Felipe Balbi:
>>> Hi,
>>>
>>> On Mar 16, 2011, at 12:17 PM, Alexander Holler wrote:
>>>>> static int __init omap2430_probe(struct platform_device *pdev)
>>>>
>>>> Neither omap2430_init() nor omap2430_probe() will be called here.
>>>
>>> and why is that ? It's even in sysfs already:
>>>
>>>>>> beagle linux # ls /sys/devices/platform/ | grep musb
>>>>>> musb-omap2430
>>
>> Don't know, I haven't written or changed the driver. ;)
>
> hehe, Just thought that you had something in mind already.
>
> probe() functions are called when, in case of platform_devices,
> the name matches with driver name. musb-omap2430 platform_device
> is allocated in arch/arm/mach-omap2/usb-musb.c, then musb-2430
> driver lives in drivers/usb/musb/omap2430.c. musb-2430 allocates a
> platform_device for musb-hdrc core driver.
>
> We did that because the same core is used in many different platforms
> (OMAP, discrete chips, ST-Ericsson, DaVinci, PCI cards, etc) so we
> needed to "abstract" platform-specific details such as clock handling
> and power management.
>
> There's still work to be done, for sure, e.g. the DMA part is still quite
> screwed up, but the drivers are correctly named which means they
> should be matching and probing. Now, musb-hdrc isn't probing, as
> you say, and I'd like to know why. I'll try to spend some time in
> it when I get back to the office.

I currently assume it's something with

subsys_initcall(omap2430_init);

Have to read about subsys_initcall() and why omap2430_init isn't called 
here.

Regards,

Alexander Holler
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