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In-Reply-To: <20220113115745.45826-2-liang.yang@amlogic.com>
References: <20220113115745.45826-1-liang.yang@amlogic.com> <20220113115745.45826-2-liang.yang@amlogic.com>
Subject: Re: [PATCH v9 1/4] clk: meson: add one based divider support for sclk
From:   Stephen Boyd <sboyd@kernel.org>
Cc:     Liang Yang <liang.yang@amlogic.com>,
        Martin Blumenstingl <martin.blumenstingl@googlemail.com>,
        Jianxin Pan <jianxin.pan@amlogic.com>,
        Victor Wan <victor.wan@amlogic.com>,
        XianWei Zhao <xianwei.zhao@amlogic.com>,
        Kelvin Zhang <kelvin.zhang@amlogic.com>,
        BiChao Zheng <bichao.zheng@amlogic.com>,
        YongHui Yu <yonghui.yu@amlogic.com>,
        linux-arm-kernel@lists.infradead.org,
        linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org,
        devicetree@vger.kernel.org
To:     Jerome Brunet <jbrunet@baylibre.com>,
        Kevin Hilman <khilman@baylibre.com>,
        Liang Yang <liang.yang@amlogic.com>,
        Michael Turquette <mturquette@baylibre.com>,
        Neil Armstrong <narmstrong@baylibre.com>,
        Rob Herring <robh+dt@kernel.org>, linux-clk@vger.kernel.org
Date:   Thu, 13 Jan 2022 13:28:00 -0800
User-Agent: alot/0.9.1
Message-Id: <20220113212801.E88BFC36AE3@smtp.kernel.org>
Precedence: bulk

Quoting Liang Yang (2022-01-13 03:57:42)
> diff --git a/drivers/clk/meson/sclk-div.c b/drivers/clk/meson/sclk-div.c
> index 76d31c0a3342..79c9efd28115 100644
> --- a/drivers/clk/meson/sclk-div.c
> +++ b/drivers/clk/meson/sclk-div.c
> @@ -28,22 +29,39 @@ meson_sclk_div_data(struct clk_regmap *clk)
>         return (struct meson_sclk_div_data *)clk->data;
>  }
> =20
> -static int sclk_div_maxval(struct meson_sclk_div_data *sclk)
> +static inline int sclk_get_reg(int val, unsigned char flag)
>  {
> -       return (1 << sclk->div.width) - 1;
> +       if ((flag & MESON_SCLK_ONE_BASED) || !val)
> +               return val;
> +       else
> +               return val - 1;

Please drop the else

> +}
> +
> +static inline int sclk_get_divider(int reg, unsigned char flag)
> +{
> +       if (flag & MESON_SCLK_ONE_BASED)
> +               return reg;
> +       else

Please drop the else

> +               return reg + 1;
>  }
> =20
>  static int sclk_div_maxdiv(struct meson_sclk_div_data *sclk)
>  {
> -       return sclk_div_maxval(sclk) + 1;