linux-kernel - Re: [linux-sunxi] [PATCH v4 2/3] clk: sunxi-ng: nkm: add support for fixed post-divider

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Date:   Mon, 14 Aug 2017 22:46:17 +0800
From:   Chen-Yu Tsai <wens@...e.org>
To:     Icenowy Zheng <icenowy@...c.io>
Cc:     Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        linux-clk <linux-clk@...r.kernel.org>,
        linux-sunxi <linux-sunxi@...glegroups.com>
Subject: Re: [linux-sunxi] [PATCH v4 2/3] clk: sunxi-ng: nkm: add support for
 fixed post-divider

On Sat, Aug 12, 2017 at 8:43 PM, Icenowy Zheng <icenowy@...c.io> wrote:
> SATA PLL on Allwinner R40 is of type (parent) * N * K / M / 6 where 6 is
> the fixed post-divider.
>
> Add post-divider support for NKM type clock.
>
> Signed-off-by: Icenowy Zheng <icenowy@...c.io>
> ---
>  drivers/clk/sunxi-ng/ccu_nkm.c | 22 +++++++++++++++++++---
>  drivers/clk/sunxi-ng/ccu_nkm.h |  2 ++
>  2 files changed, 21 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/clk/sunxi-ng/ccu_nkm.c b/drivers/clk/sunxi-ng/ccu_nkm.c
> index 44b16dc8fea6..ce7f03737ad5 100644
> --- a/drivers/clk/sunxi-ng/ccu_nkm.c
> +++ b/drivers/clk/sunxi-ng/ccu_nkm.c

[...]

> @@ -139,6 +152,9 @@ static int ccu_nkm_set_rate(struct clk_hw *hw, unsigned long rate,
>         unsigned long flags;
>         u32 reg;
>
> +       if (nkm->common.features & CCU_FEATURE_FIXED_POSTDIV)
> +               rate /= nkm->fixed_post_div;

This should be

        rate *= nkm->fixed_post_div;

Fixed and applied.

ChenYu

> +
>         _nkm.min_n = nkm->n.min ?: 1;
>         _nkm.max_n = nkm->n.max ?: 1 << nkm->n.width;
>         _nkm.min_k = nkm->k.min ?: 1;

[...]