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To: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>,
        "Wolfram Sang" <wsa@the-dreams.de>,
        "Geert Uytterhoeven" <geert+renesas@glider.be>
From: Mike Turquette <mturquette@linaro.org>
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Cc: "Stephen Boyd" <sboyd@codeaurora.org>,
        "Laurent Pinchart" <laurent.pinchart@ideasonboard.com>,
        "Ulrich Hecht" <ulrich.hecht+renesas@gmail.com>,
        "Wolfram Sang" <wsa@sang-engineering.com>, linux-sh@vger.kernel.org,
        linux-kernel@vger.kernel.org
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 <20150204173233.GA30930@katana> <54D25AAA.8070904@cogentembedded.com>
Message-ID: <20150204220152.421.38508@quantum>
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Subject: Re: [PATCH] clk: shmobile: div6: Avoid division by zero in .round_rate()
Date: Wed, 04 Feb 2015 14:01:52 -0800
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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@glider.be>
> 
> > Acked-by: Wolfram Sang <wsa+renesas@sang-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
>