linux-kernel - Re: [PATCH 1/2] [IDE] Platform IDE driver

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Date:	Wed, 01 Aug 2007 16:39:32 +0400
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Segher Boessenkool <segher@...nel.crashing.org>
Cc:	Scott Wood <scottwood@...escale.com>, linuxppc-dev@...abs.org,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] [IDE] Platform IDE driver

Hello.

Segher Boessenkool wrote:

>>     This doesn't mean that shift is better anyway. If everyone 
>> considers it
>> better, I give up. But be warned that shift (stride) is not the only 
>> property
>> characterizing register accesses -- the regs might be only accessible as
>> 16/32-bit quantities, for example (16-bit is a real world example -- from
>> Amiga or smth of that sort, IIRC).

> More importantly, "reg-shift" doesn't say what part of
> the bigger words to access.  A common example is byte-wide
> registers on a 32-bit-only bus; it's about 50%-50% between
> connecting the registers to the low byte vs. connecting it
> to the byte with the lowest address.

    We already have "big-endian" prop used in MPIC nodes, IIRC. Could try to 
"reuse" it here as well...

> The only realistic way to handle all this is to put some
> knowledge into the device driver.  This does of course
> also mean that no "reg-shift" property is needed; the
> device driver can look at your "compatible" property,
> instead.

>>>>    Why the heck should we care about the UART code taling about IDE?!

>>> Consistency?

>>     We're not obliged to be consistent with every piece of the kernel 
>> code.

> It would be nice to not name similar properties in the
> device tree dissimilarly.  Kernel code doesn't come into
> the picture here.

    The "reg-shift" prop is yet unaccepted ad-hockery at this point. ;-)
    So, I don't see why we have to be consistent with it.

> Segher

WBR, Sergei
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