linux-kernel - Re: [Nios2-dev] [PATCHv3 1/2] serial: Add driver for the Altera JTAG UART

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Message-ID: <4B9ED52F.6050407@wytron.com.tw>
Date:	Tue, 16 Mar 2010 08:47:43 +0800
From:	Thomas Chou <thomas@...ron.com.tw>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	nios2-dev@...c.et.ntust.edu.tw,
	Tobias Klauser <tklauser@...tanz.ch>, gregkh@...e.de,
	linux-kernel@...r.kernel.org, linux-serial@...r.kernel.org
Subject: Re: [Nios2-dev] [PATCHv3 1/2] serial: Add driver for the Altera 
 JTAG UART

On 03/13/2010 04:48 AM, Andrew Morton wrote:
>> +config SERIAL_ALTERA_JTAGUART
>> +	bool "Altera JTAG UART support"
>> +	select SERIAL_CORE
>> +	help
>> +	  This driver supports the Altera JTAG UART port.
>> +
> So this driver will be available on all CPU architectures.
>
> I'm guessing that the hardware _isn't_ available on all CPU
> architectures?  Maybe that's wrong.
>
>    
It is true that this driver is used mostly with nios2, soft-core 
coldfire and arm. But peripherals on FPGA can be made available to 
almost any CPU architecture. So I think it might make sense to let it 
available to all. Or should we put a "default n" ?

>> +#include<linux/platform_device.h>
>> +#include<linux/io.h>
>> +#include<linux/altera_jtaguart.h>
>>      
>
> Does it make sense to put altera_jtaguart.h into include/linux?  Could
> we put it in drivers/serial/?
>
>
>    
There is only a platform data structure declaration in the header, which 
should be passed through platform device data to the driver. If we put 
it in drivers/serial/, then we will need to include 
"../../../drivers/serial/altera_jtaguart.h" .

I have written this driver in parallel with the altera_uart driver. We 
could have passed the data ( base, irq, freq ) using platform resources. 
But I don't know if there is a way to pass ( freq )? Please let me know 
if you have any suggestions.

- Thomas
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