linux-kernel - Re: [PATCH 1/3] drivers: base: add support for stmp-style devices

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Message-ID: <20120308121452.GA2499@S2101-09.ap.freescale.net>
Date:	Thu, 8 Mar 2012 20:14:55 +0800
From:	Shawn Guo <shawn.guo@...aro.org>
To:	Wolfram Sang <w.sang@...gutronix.de>
Cc:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	Greg KH <gregkh@...e.de>, Huang Shijie <b32955@...escale.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 1/3] drivers: base: add support for stmp-style devices

On Wed, Mar 07, 2012 at 11:28:32PM +0100, Wolfram Sang wrote:
> MX23/28 use IP cores which follow a register layout I have first seen on
> STMP3xxx SoCs. In this layout, every register actually has four u32:
> 
>  1.) to store a value directly
>  2.) a SET register where every 1-bit sets the corresponding bit,
>      others are unaffected
>  3.) same with a CLR register
>  4.) same with a TOG (toggle) register
> 
> Also, the 2 MSBs in register 0 are always the same and can be used to reset
> the IP core.
> 
> All this is strictly speaking not mach-specific (but IP core specific) and,
> thus, doesn't need to be in mach-mxs/include. At least mx6 also uses IP cores
> following this stmp-style. So:
> 
> Introduce a stmp-style device, put the code and defines for that in a public
> place (drivers/base/), and let drivers for stmp-style devices select that code.
> To avoid regressions and ease reviewing, the actual code is simply copied from
> mach-mxs. It definately wants updates, but those need a seperate patch series.
> 
> Voila, mach dependency gone, reusable code introduced. Note that I didn't
> remove the duplicated code from mach-mxs yet, first the drivers have to be
> converted.
> 
> Signed-off-by: Wolfram Sang <w.sang@...gutronix.de>

Acked-by: Shawn Guo <shawn.guo@...aro.org>
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