linux-kernel - Re: [PATCH v3 2/3] clk: fractional-divider: keep mwidth and nwidth internally

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Message-ID: <CACVXFVNUBcrgho3G_whaXAEVBgg0a1KsWmAH50bW6dVcyMwvPw@mail.gmail.com>
Date:	Thu, 9 Apr 2015 16:22:08 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:	Stephen Boyd <sboyd@...eaurora.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	heikki.krogerus@...ux.intel.com
Subject: Re: [PATCH v3 2/3] clk: fractional-divider: keep mwidth and nwidth internally

On Wed, Apr 1, 2015 at 6:09 PM, Andy Shevchenko
<andriy.shevchenko@...ux.intel.com> wrote:
> The patch adds mwidth and nwidth fields to the struct clk_fractional_divider
> for further usage. While here, use clk_div_mask() instead of open coding this
> functionality.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> ---
>  drivers/clk/clk-fractional-divider.c | 8 +++++---
>  include/linux/clk-provider.h         | 3 ++-
>  2 files changed, 7 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/clk/clk-fractional-divider.c b/drivers/clk/clk-fractional-divider.c
> index 786aa482..23a56a0 100644
> --- a/drivers/clk/clk-fractional-divider.c
> +++ b/drivers/clk/clk-fractional-divider.c
> @@ -50,7 +50,7 @@ static long clk_fd_round_rate(struct clk_hw *hw, unsigned long rate,
>                               unsigned long *prate)
>  {
>         struct clk_fractional_divider *fd = to_clk_fd(hw);
> -       unsigned maxn = (fd->nmask >> fd->nshift) + 1;
> +       unsigned maxn = clk_div_mask(fd->nwidth) + 1;

Looks clk_div_mask() can't be found when I build the latest
next with these 3 patches:

  CC      drivers/clk/clk-fractional-divider.o
drivers/clk/clk-fractional-divider.c: In function ‘clk_fd_round_rate’:
drivers/clk/clk-fractional-divider.c:67:4: error: implicit declaration
of function ‘clk_div_mask’ [-Werror=implicit-function-declaration]
    clk_div_mask(fd->mwidth), clk_div_mask(fd->nwidth),
    ^
cc1: some warnings being treated as errors
make[2]: *** [drivers/clk/clk-fractional-divider.o] Error 1

Thanks,

>         unsigned div;
>
>         if (!rate || rate >= *prate)
> @@ -130,9 +130,11 @@ struct clk *clk_register_fractional_divider(struct device *dev,
>
>         fd->reg = reg;
>         fd->mshift = mshift;
> -       fd->mmask = (BIT(mwidth) - 1) << mshift;
> +       fd->mwidth = mwidth;
> +       fd->mmask = clk_div_mask(mwidth) << mshift;
>         fd->nshift = nshift;
> -       fd->nmask = (BIT(nwidth) - 1) << nshift;
> +       fd->nwidth = nwidth;
> +       fd->nmask = clk_div_mask(nwidth) << nshift;
>         fd->flags = clk_divider_flags;
>         fd->lock = lock;
>         fd->hw.init = &init;
> diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
> index 20b0b67..eb3c96f 100644
> --- a/include/linux/clk-provider.h
> +++ b/include/linux/clk-provider.h
> @@ -480,13 +480,14 @@ struct clk *clk_register_fixed_factor(struct device *dev, const char *name,
>   *
>   * Clock with adjustable fractional divider affecting its output frequency.
>   */
> -
>  struct clk_fractional_divider {
>         struct clk_hw   hw;
>         void __iomem    *reg;
>         u8              mshift;
> +       u8              mwidth;
>         u32             mmask;
>         u8              nshift;
> +       u8              nwidth;
>         u32             nmask;
>         u8              flags;
>         spinlock_t      *lock;
> --
> 2.1.4
>
> --
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-- 
Ming Lei
--
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