linux-kernel - Re: [PATCH v9 4/5] clk: imx: add imx composite clock

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Message-ID: <CAOMZO5D7yLUzriOub4RWsq1K8_fTj6c0LFOnSZwHyjqMPYu=0A@mail.gmail.com>
Date:   Tue, 25 Sep 2018 13:42:12 -0300
From:   Fabio Estevam <festevam@...il.com>
To:     Abel Vesa <abel.vesa@....com>
Cc:     Lucas Stach <l.stach@...gutronix.de>,
        Sascha Hauer <kernel@...gutronix.de>,
        Dong Aisheng <aisheng.dong@....com>,
        Fabio Estevam <fabio.estevam@....com>,
        Anson Huang <anson.huang@....com>,
        Andrey Smirnov <andrew.smirnov@...il.com>,
        Rob Herring <robh@...nel.org>, Stephen Boyd <sboyd@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        open list <linux-kernel@...r.kernel.org>,
        "open list:COMMON CLK FRAMEWORK" <linux-clk@...r.kernel.org>,
        Abel Vesa <abelvesa@...ux.com>,
        NXP Linux Team <linux-imx@....com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v9 4/5] clk: imx: add imx composite clock

Hi Abel,

On Mon, Sep 24, 2018 at 7:39 AM, Abel Vesa <abel.vesa@....com> wrote:

> +static long imx_clk_composite_divider_round_rate(struct clk_hw *hw,
> +                                               unsigned long rate,
> +                                               unsigned long *prate)
> +{
> +       int prediv_value;
> +       int div_value;
> +
> +       imx_clk_composite_compute_dividers(rate, *prate,
> +                                               &prediv_value, &div_value);
> +
> +       rate = DIV_ROUND_UP_ULL((u64)*prate, prediv_value);

You assing a value to 'rate' here.

> +       rate = DIV_ROUND_UP_ULL((u64)rate, div_value);

And then overwrite it immediately after.

Is this really the intended behavior?