linux-kernel - Re: [PATCH] clk: shmobile: div6: Avoid division by zero in .round

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Message-ID: <20150204220152.421.38508@quantum>
Date:	Wed, 04 Feb 2015 14:01:52 -0800
From:	Mike Turquette <mturquette@...aro.org>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	"Wolfram Sang" <wsa@...-dreams.de>,
	"Geert Uytterhoeven" <geert+renesas@...der.be>
Cc:	"Stephen Boyd" <sboyd@...eaurora.org>,
	"Laurent Pinchart" <laurent.pinchart@...asonboard.com>,
	"Ulrich Hecht" <ulrich.hecht+renesas@...il.com>,
	"Wolfram Sang" <wsa@...g-engineering.com>,
	linux-sh@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: shmobile: div6: Avoid division by zero in .round_rate()

Quoting Sergei Shtylyov (2015-02-04 09:45:14)
> Hello.
> 
> On 02/04/2015 08:32 PM, Wolfram Sang wrote:
> 
> >> Anyone may call clk_round_rate() with a zero rate value, so we have to
> >> protect against that.
> 
> >> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> 
> > Acked-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> 
> > I agree that this should not be fixed in the core because the fixup is
> > really driver dependant.
> 
>     Dunno, zero frequency seems generally insane to me.

It is useful to find the lowest frequency a clock can support. Basically
it is a search for the floor frequency.

Regards,
Mike

> 
> WBR, Sergei
> 
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