linux-kernel - Re: [PATCH v2 03/15] clk: sunxi-ng: Add check for maximum rate to NKM PLLs

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Date:   Tue, 23 Oct 2018 10:10:22 -0700
From:   Vasily Khoruzhick <anarsoul@...il.com>
To:     Jagan Teki <jagan@...rulasolutions.com>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>, Icenowy Zheng <icenowy@...c.io>,
        Jernej Skrabec <jernej.skrabec@...l.net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        David Airlie <airlied@...ux.ie>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        mturquette@...libre.com, sboyd@...nel.org,
        linux-clk <linux-clk@...r.kernel.org>,
        michael@...rulasolutions.com,
        arm-linux <linux-arm-kernel@...ts.infradead.org>,
        devicetree <devicetree@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-sunxi@...glegroups.com
Subject: Re: [PATCH v2 03/15] clk: sunxi-ng: Add check for maximum rate to NKM PLLs

On Tue, Oct 23, 2018 at 8:51 AM Jagan Teki <jagan@...rulasolutions.com> wrote:
>
> Some NKM PLLs, frequency can be set above PLL working range.
>
> Add a constraint for maximum supported rate. This way, drivers can
> specify which is maximum allowed rate for PLL.

I'd squash patches 2 and 3 into a single patch.

> Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
> ---
> Changes for v2:
> - new patch
>
>  drivers/clk/sunxi-ng/ccu_nkm.c | 7 +++++++
>  drivers/clk/sunxi-ng/ccu_nkm.h | 1 +
>  2 files changed, 8 insertions(+)
>
> diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
> index d17539dc88dd..574fd2cd2a79 100644
> --- a/drivers/clk/sunxi-ng/ccu_nkm.c
> +++ b/drivers/clk/sunxi-ng/ccu_nkm.c
> @@ -132,6 +132,13 @@ static unsigned long ccu_nkm_round_rate(struct ccu_mux_internal *mux,
>                 return rate;
>         }
>
> +       if (nkm->max_rate && rate > nkm->max_rate) {
> +               rate = nkm->max_rate;
> +               if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
> +                       rate /= nkm->fixed_post_div;
> +               return rate;
> +       }
> +
>         ccu_nkm_find_best(*parent_rate, rate, &_nkm);
>
>         rate = *parent_rate * _nkm.n * _nkm.k / _nkm.m;
> diff --git a/drivers/clk/sunxi-ng/ccu_nkm.h b/drivers/clk/sunxi-ng/ccu_nkm.h
> index ff5bd00f429f..c82590481188 100644
> --- a/drivers/clk/sunxi-ng/ccu_nkm.h
> +++ b/drivers/clk/sunxi-ng/ccu_nkm.h
> @@ -36,6 +36,7 @@ struct ccu_nkm {
>
>         unsigned int            fixed_post_div;
>         unsigned int            min_rate;
> +       unsigned int            max_rate;
>
>         struct ccu_common       common;
>  };
> --
> 2.18.0.321.gffc6fa0e3
>