linux-kernel - Re: [PATCH] serial driver PMC MSP71xx, kernel linux-mips.git mast er

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Date:	Wed, 24 Jan 2007 08:48:53 -0800
From:	Marc St-Jean <Marc_St-Jean@...-sierra.com>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
Cc:	Alan <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org, linux-mips@...ux-mips.org
Subject: Re: [PATCH] serial driver PMC MSP71xx, kernel linux-mips.git mast
	 er

Sergei Shtylyov wrote:
> 
>  >>This I would hope you can hide in the platform specific
>  >>serial_in/serial_out functions. If you write the UART_LCR save it in
>  >>serial_out(), if you read IER etc.
> 
>  > I couldn't find hooks for platform specific serial_in/out functions.
> 
>     It's because there are none. :-)
> 
>  > Do you mean using the up->port.iotype's in serial_in/out from 8250.c?
> 
>     Not sure what Alan meant, but this seems the only option for now.

That's the conclusion I came to. I've rewritten the patch to use port.type
instead of iotype since one of the fix is SoC and not UART specific. I guess
I could use both iotype and type with a test on each for the appropriate
bug, what do you recommend?


>   >>And we might want to add a void * for board specific insanity to the 
> 8250
>  >>structures if we really have to so you can hang your brain damage
>  >>privately off that ?
> 
>  > Sounds good to me, it would give us a location to store the address 
> of the
>  > UART_STATUS_REG required by this UART variant.
> 
>     I doubt we really need to *store* it somewhere. Isn't it an fixed 
> offset
> from UART's base (I haven't seen the header)?

Unfortunately it's not a constant offset from the UART in the SoC register
space. I've used Alan suggestion and added a classic, on some other OSes %-|,
void "user" pointer.

I'll repost as soon I complete testing and try the new timer patch.

Marc
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