linux-kernel - Re: [PATCH v5 4/4] clk: basic clock hardware types

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Date:	Mon, 5 Mar 2012 11:17:08 +0100
From:	Andrew Lunn <andrew@...n.ch>
To:	Sascha Hauer <s.hauer@...gutronix.de>
Cc:	Andrew Lunn <andrew@...n.ch>,
	"Turquette, Mike" <mturquette@...com>,
	Russell King <linux@....linux.org.uk>, patches@...aro.org,
	linaro-dev@...ts.linaro.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Jeremy Kerr <jeremy.kerr@...onical.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arnd Bergman <arnd.bergmann@...aro.org>,
	Paul Walmsley <paul@...an.com>,
	Shawn Guo <shawn.guo@...escale.com>,
	Jamie Iles <jamie@...ieiles.com>,
	Richard Zhao <richard.zhao@...aro.org>,
	Saravana Kannan <skannan@...eaurora.org>,
	Magnus Damm <magnus.damm@...il.com>,
	Rob Herring <rob.herring@...xeda.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Linus Walleij <linus.walleij@...ricsson.com>,
	Stephen Boyd <sboyd@...eaurora.org>,
	Amit Kucheria <amit.kucheria@...aro.org>,
	Deepak Saxena <dsaxena@...aro.org>,
	Grant Likely <grant.likely@...retlab.ca>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: [PATCH v5 4/4] clk: basic clock hardware types

> > I think i can wrap your simple gate clock, to make my "complex" gate
> > clock. What would help is if you would EXPORT_SYMBOL_GPL
> > clk_gate_enable() and clk_gate_disable(), since they do exactly what i
> > want. I can then build my own clk_ops structure, with my own
> > unprepare() function. I would probably use DEFINE_CLK_GATE as is, and
> > then at run time, before calling __clk_init() overwrite the .ops with
> > my own version.
> 
> Maybe I don't get your point, but clk_unprepare should be used when
> you have to sleep to disable your clock. When clk_gate_disable() is
> exactly why do you want to use clk_unprepare instead of clk_disable?

I'm trying to avoid having to implement a new clock provider. The
whole point of the generic clk code is to consolidate code. It seems
silly to create a new clk provider which is 95% identical to Mike's
gated provider, if i can avoid it.

If i stuff it into clk_disable(), it means i cannot use the basic gate
clock Mike provides in the generic clock framework. Which is a shame,
since it does exactly what i want in terms of gating the clock.

If i can use unprepare(), which basic gate does not use, i can use
Mikes code, and just extend it. It is there, it is unused, so why not
use it?

    Andrew
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