linux-kernel - Re: [PATCH E 10/14] OMAP clock: support "dry run" rate and parent changes

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Message-Id: <200902081148.59158.david-b@pacbell.net>
Date:	Sun, 8 Feb 2009 11:48:58 -0800
From:	David Brownell <david-b@...bell.net>
To:	"Russell King - ARM Linux" <linux@....linux.org.uk>
Cc:	Paul Walmsley <paul@...an.com>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH E 10/14] OMAP clock: support "dry run" rate and parent changes

On Sunday 08 February 2009, Russell King - ARM Linux wrote:
> A far better way to approach this would be to split the set_rate/recalc
> functionality into two parts:
> 
> 1. a method which returns the both the new clock rate and the hardware
>    programming information
> 2. a method to commit the hardware programming information to the registers

Much simpler to just pass a "commit" flag and not
try to come up with some generic way to represent
"hardware programming information"; in general that
will be very different between clocks.

Then clk_round_rate() passes "false" for commit,
while clk_set_rate() passes "true".  And in both
cases the value returned is the rate, or negative
errno to indicate a fault.

- Dave
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