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From: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Christophe JAILLET
	<christophe.jaillet-39ZsbGIQGT5GWvitb5QawA@public.gmane.org>
Cc: f.fainelli-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	bcm-kernel-feedback-list-dY08KVG/lbpWk0Htik3J/w@public.gmane.org,
	jonas.gorski-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	kernel-janitors-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH] spi: bcm63xx-hsspi: Really keep pll clk enabled
Date: Mon, 2 Mar 2020 12:38:59 +0000	[thread overview]
Message-ID: <20200302123859.GC4166@sirena.org.uk> (raw)
In-Reply-To: <20200228213838.7124-1-christophe.jaillet-39ZsbGIQGT5GWvitb5QawA@public.gmane.org>

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On Fri, Feb 28, 2020 at 10:38:38PM +0100, Christophe JAILLET wrote:

> To be honest, I don't see why we need to keep pll clk, or hsspi clk
> enabled during the lifetime of the driver. My understanding of the code is
> that it is only used to get the 'speed_hz' value in the probe function.
> This value is never refreshed afterwards.
> I don't see the point in enabling/disabling the clks. I think that they
> both could be disabled in the probe function, without the need to keep
> track in the bcm63xx_hsspi structure, neither during pm cycles or the
> remove fucntion.

If the device has a clock there's a good chance it's needed for the
device to operate and that disabling it will save a little power when
the device isn't doing anything.

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  parent reply	other threads:[~2020-03-02 12:38 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-28 21:38 Christophe JAILLET
     [not found] ` <20200228213838.7124-1-christophe.jaillet-39ZsbGIQGT5GWvitb5QawA@public.gmane.org>
2020-03-02 12:38   ` Mark Brown [this message]
2020-03-02 13:03   ` Jonas Gorski
2020-03-02 16:05 ` Applied "spi: bcm63xx-hsspi: Really keep pll clk enabled" to the spi tree Mark Brown

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