linux-kernel - Re: [PATCH 2/2] [POWERPC] MPC8349E-mITX: use platform IDE driver for CF interface

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Message-ID: <46A798D8.7020906@freescale.com>
Date:	Wed, 25 Jul 2007 13:39:20 -0500
From:	Scott Wood <scottwood@...escale.com>
To:	Sergei Shtylyov <sshtylyov@...mvista.com>
CC:	Vitaly Bordug <vitb@...nel.crashing.org>,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	linuxppc-dev@...abs.org
Subject: Re: [PATCH 2/2] [POWERPC] MPC8349E-mITX: use platform IDE driver
 for CF	interface

Sergei Shtylyov wrote:
> Hello.
> 
> Scott Wood wrote:
> 
>>>    Also, what mmio-ide in the compat properly means in the context of 
>>> ide_platform which is able to handle both port and memory mapped IDE.
> 
> 
>> I/O-space is only valid in the context of PCI, ISA, or similar buses, and
>> the bus-specific reg format indicates whether it's mmio-space or
>> io-space.
> 
>    You could save time on lecturing me (and use it to look on the driver 
> ;-).

Sorry, I misread the question as being a mismatch between the 
capabilities of the device binding and the driver, not about the 
specific compatible name.  Something like "generic-ide" would probably 
be better.

>> What is board specific about a set of standard IDE registers at a given
> 
>    The regisrer mapping used is highly non-standard.

The gap between registers is nonstandard, but that's a fairly common 
type of noncompliance in embedded-land, and probably merits being 
supported in a generic way.  I wouldn't call it "highly" nonstandard.

Is there some other non-standardness that I'm missing?

>    We're already in board specific code, so why the heck not? :-)
> 
>> various ns16550-compatibles out there as well?
> 
>    I never suggested that -- what I did suggest was make of_serial.c 
> recognize certain chip types and register them with 8250 driver.

What would be the advantage of maintaining a list of chips whose only 
difference is register spacing, rather than just using reg-shift and 
being done with it?

-Scott
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