linux-kernel - Re: [PATCH 01/33] clk_ops: change round

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Date:   Sun, 31 Dec 2017 13:40:07 +0000
From:   Bryan O'Donoghue <pure.logic@...us-software.ie>
To:     Mikko Perttunen <cyndis@...si.fi>, mturquette@...libre.com,
        sboyd@...eaurora.org, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org
Cc:     linux-omap@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mips@...ux-mips.org, linux-rpi-kernel@...ts.infradead.org,
        patches@...nsource.cirrus.com,
        uclinux-h8-devel@...ts.sourceforge.jp,
        linux-amlogic@...ts.infradead.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-rockchip@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-tegra@...r.kernel.org,
        dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org,
        freedreno@...ts.freedesktop.org, linux-media@...r.kernel.org,
        linux-rtc@...r.kernel.org
Subject: Re: [PATCH 01/33] clk_ops: change round_rate() to return unsigned
 long

On 30/12/17 16:36, Mikko Perttunen wrote:
> FWIW, we had this problem some years ago with the Tegra CPU clock - then 
> it was determined that a simpler solution was to have the determine_rate 
> callback support unsigned long rates - so clock drivers that need to 
> return rates higher than 2^31 can instead implement the determine_rate 
> callback. That is what's currently implemented.
> 
> Mikko

Granted we could work around it but, having both zero and less than zero 
indicate error means you can't support larger than LONG_MAX which is I 
think worth fixing.

---
bod