linux-kernel - Re: [PATCH 2/2] New driver: Xillybus generic interface for FPGA (programmable logic)

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Message-id: <50B8C7BF.4000004@gmail.com>
Date:	Fri, 30 Nov 2012 16:50:39 +0200
From:	Eli Billauer <eli.billauer@...il.com>
To:	Greg KH <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, arnd@...db.de
Subject: Re: [PATCH 2/2] New driver: Xillybus generic interface for FPGA
 (programmable logic)

Thanks for the remarks.

I'm sending the updated patches in a minute. Basically, I divided the 
module into three (one core, one for PCIe and one for OF) and made 
several corrections.

On 11/28/2012 06:57 PM, Greg KH wrote:
> What is the user/kernel interface for this driver?  Is it documented
> anywhere?
>    
There's a rather extensive documentation for download at the site. The 
docs for the host side mostly instruct common UNIX programming 
techniques: The device files are just data pipes to FIFOs in the FPGA, 
behaving like one would expect.
>> +#if (PAGE_SIZE<  4096)
>> +#error Your processor architecture has a page size smaller than 4096
>> +#endif
>>      
> That can never happen.  Even if it does, you don't care about that in
> the driver.
>
>    
I removed this check because it can't happen. But the driver *does* care 
about this, since it creates a lot of buffers with different alignments, 
hence depending on the pages' alignment.
>
>> +static struct class *xillybus_class;
>>      
> Why not just use the misc interface instead of your own class?
>    
When Xillybus is used, the whole system's mission is usually around it 
(e.g. it's a computer doing data acquisition through the Xillybus 
pipes). So giving it a high profile makes sense, I believe. Besides, a 
dozen of device files are not rare.

Regards,
     Eli


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