linux-kernel - Re: [PATCH 08/10] spi: sh-msiof: Move clock management to (un)prepare

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Message-ID: <20140222032700.GX25940@sirena.org.uk>
Date:	Sat, 22 Feb 2014 12:27:00 +0900
From:	Mark Brown <broonie@...nel.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Takashi Yoshii <takasi-y@....dti.ne.jp>,
	Magnus Damm <magnus.damm@...il.com>, linux-spi@...r.kernel.org,
	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org,
	Geert Uytterhoeven <geert+renesas@...ux-m68k.org>
Subject: Re: [PATCH 08/10] spi: sh-msiof: Move clock management to
 (un)prepare_message()

On Thu, Feb 20, 2014 at 03:43:07PM +0100, Geert Uytterhoeven wrote:

> +	if (!test_and_set_bit(0, &p->flags)) {
> +		pm_runtime_get_sync(&p->pdev->dev);
> +		clk_enable(p->clk);
> +	}

That test_and_set_bit() is a bit odd - what's going on there, perhaps a
comment is in order?  I'd also like to see return value checks, though
the original didn't have them so it's not a blocker, and ideally that
should be clk_prepare_enable().  I guess the clock stuff could even be
moved inside the runtime PM callbacks?  Again not a blocker if the
existing code doesn't have things but it'd be nice to do.

There's also auto_runtime_pm in the SPI core which will do the runtime
PM for you if you can do it unconditionally.

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