linux-kernel - Re: [PATCH v4] openrisc: irq: use irqchip framework

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Message-ID: <20140621071340.GA27032@chokladfabriken.org>
Date:	Sat, 21 Jun 2014 10:13:42 +0300
From:	Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
To:	Jason Cooper <jason@...edaemon.net>
Cc:	Jonas Bonn <jonas@...thpole.se>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux <linux@...ts.openrisc.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH v4] openrisc: irq: use irqchip framework

On Fri, Jun 20, 2014 at 10:04:30PM -0400, Jason Cooper wrote:
> On Thu, May 29, 2014 at 11:28:08PM +0300, Stefan Kristiansson wrote:
> > But I don't understand the purpose of the versioning here,
> > there will never be any other or1200-pic version than the one that currently
> > exists, so IMO "or1200" should be enough versioning information.
> 
> I'm horribly unfamiliar with openrisc, but compatible strings are
> compatible strings. ;-)
> 
> Is the *actual* IP block called or1200-pic?  Or is it, eg or1235-pic, and
> you're using or1200-pic as a generic catch-all?
> 

No, the or1200-pic is a part of the or1200 cpu that is one
(there are several others) implementation of the OpenRISC 1000 architecture.
The quirk here is that the OpenRISC 1000 architecture specification specifies
how a PIC should be implemented, but or1200 doesn't follow that to 100%.
Thus, it need a bit of special care.

The implementations that follow the specification can use the
or1k-pic-level and or1k-pic-edge variants.

> Please use the specific IP name without wildcards.  That compatible
> string will then be used on that IP and future IP that is compatible
> with the original IP.  Once an incompatible change is introduced, then
> we'll create a new compatible string, say or1300-pic, or or1237-pic.
> 

The point I tried to make above was that if a change would be
made to the pic implementation in or1200, it should be a change to conform
to the specification.

> When in doubt, be specific.  I don't think the '-rtlsvnXYZ' should be
> necessary, though.
> 

I agree, and I think 'or1200-pic' is specific enough in this case.

Stefan
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