linux-kernel - Re: [PATCH 06/16] usb: musb: dsps: rename ti81xx_driver_data to am33xx_driver

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Date:	Thu, 25 Jul 2013 16:41:18 +0200
From:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:	Bin Liu <binmlist@...il.com>
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	balbi@...com, george.cherian@...com
Subject: Re: [PATCH 06/16] usb: musb: dsps: rename ti81xx_driver_data to
 am33xx_driver_data

* Bin Liu | 2013-07-23 13:23:57 [-0500]:

>Hi Sebastian,
Hi Liu,

>On Mon, Jul 22, 2013 at 1:09 PM, Sebastian Andrzej Siewior <
>bigeasy@...utronix.de> wrote:
>
>> This patch renames the type struct from ti81xx_driver_data to
>> am33xx_driver_data since it is not used for ti81xx anymore. The EOI
>> member is also removed since the am33xx SoC does not have such register.
>> The interrupt is acknowledged by writting into the stat register.
>>
>I guess the EOI register is removed from the TRM because AM33xx does not
>use it, there is no need to write to it to acknowledge. It does not hurt to
>write to it though since the register still exists, it just does nothing, I
>guess.

Is it really there or was it never there and it has been added to TRM by
accident?

>But I am not sure if it is a good idea to remove eoi from the musb_dsps
>driver. If the intension is to merge the support for other SoC, such as
>AM35xx, AM18xx, then EOI handling might be still needed. I just don't know
>how those devices use EOI.

If one of the architectures gets added which need an EOI then the offset
can be 0 and the EOI will happen only if it is != 0.

>
>Regards,
>-Bin.

Sebastian
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