linux-kernel - Re: [PATCH v2 02/11] arm: pxa27x: support ICP DAS LP-8x4x

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Date:	Mon, 9 Dec 2013 01:54:59 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Sergei Ianovich <ynvich@...il.com>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Eric Miao <eric.y.miao@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Haojian Zhuang <haojian.zhuang@...il.com>
Subject: Re: [PATCH v2 02/11] arm: pxa27x: support ICP DAS LP-8x4x

On Sunday 08 December 2013, Sergei Ianovich wrote:
> On Sun, 2013-12-08 at 03:21 +0100, Arnd Bergmann wrote:
> > On Friday 06 December 2013, Sergei Ianovich wrote:
> > You have some rather unusual options in here. I'd suggest you go through
> > the reduced defconfig file and remove all options that look like they
> > are unnecessary for your system.
> > 
> > It's probably based on some distro config that enables lots of modules
> > you don't actually want.
> 
> I tried to future-proof the config, by enabling all partition tables and
> USB disks and modems that could be plugged into the device.
> 
> I'll remove those. However, I would like to retain config options
> related to low latency and small kernel size. Keeping them will
> hopefully allow being notified about changes affecting the system.
> 
> Will this fly?

Yes, of course, keep as many as you need. I was just trying to ensure
that you had put some thought in it, and e.g. the various USB serial
modules and some other things appeared to be fairly random, but I can
see them making sense now.

> > #define LP8X4X_EOI              0x0006
> > #define LP8X4X_INSINT           0x0008
> > ...
> > 
> > and change the users to do e.g.
> > 
> >         readl(LP8X4X_FPGA_VIRT + LP8X4X_INSINT);
> 
> I am trying to boot the system with device tree. If I manage, I'll move
> this code into drivers/irqchip/ as a platform device. Otherwise, I'll
> make this change.

Ok, cool. If you need help with the DT conversion, just ask here or on
IRC (#armlinux or #mvlinux on freenode.net, there might also be a
PXA specific channel I don't know).

	Arnd
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