linux-kernel - Re: An extremely simplified pinctrl bindings proposal

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Message-ID: <20120206194125.GA23030@sirena.org.uk>
Date:	Mon, 6 Feb 2012 19:41:25 +0000
From:	Mark Brown <broonie@...nsource.wolfsonmicro.com>
To:	Stephen Warren <swarren@...dia.com>
Cc:	Linus Walleij <linus.walleij@...aro.org>,
	Dong Aisheng <dongas86@...il.com>,
	Shawn Guo <shawn.guo@...aro.org>,
	Dong Aisheng-B29396 <B29396@...escale.com>,
	"Sascha Hauer (s.hauer@...gutronix.de)" <s.hauer@...gutronix.de>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	"kernel@...gutronix.de" <kernel@...gutronix.de>,
	"cjb@...top.org" <cjb@...top.org>,
	"Simon Glass (sjg@...omium.org)" <sjg@...omium.org>,
	Thomas Abraham <thomas.abraham@...aro.org>,
	"Grant Likely (grant.likely@...retlab.ca)" 
	<grant.likely@...retlab.ca>,
	"ext Tony Lindgren (tony@...mide.com)" <tony@...mide.com>,
	"devicetree-discuss@...ts.ozlabs.org" 
	<devicetree-discuss@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: An extremely simplified pinctrl bindings proposal

On Sun, Feb 05, 2012 at 09:53:38PM -0800, Stephen Warren wrote:
> On 02/05/2012 08:20 PM, Linus Walleij wrote:

> > A controlled set of register read/writes and maybe also conditionals
> > (if that bit is 1, do this, else do that, plus a loop command to wait
> > for a flag or similar) are known as a "jam tables" and usually used
> > in BIOSes to do a compact machine initialization. I learned this term
> > in Bunnie Huang's "Hacking the Xbox, where he describes finding a
> > jam table interpreter in the Xbox ROM.

FWIW I just added a subset of this functionality (called "patches" for
want of a better name) to regmap, just a simple list of register writes
that get blasted in htere.  The intent is somewhat different, though -
it's there for dumping undocumented or partially documented register
write sequences from vendors into devices since there's a common pattern
of doing that when bringing things out of reset, more like what Grant
seems to have been talking about in that thread.
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