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SubjectRe: [PATCH v4 1/3] clk: sunxi-ng: div: Add support for fixed post-divider
在 2017-08-12 20:43,Icenowy Zheng 写道:
> From: Priit Laes <plaes@plaes.org>
>
> SATA clock on sun4i/sun7i is of type (parent) / M / 6 where
> 6 is fixed post-divider.
>
> Signed-off-by: Priit Laes <plaes@plaes.org>

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>

> ---
> It's based on the patch in v6 of the A10/A20 CCU patchset, but with
> ccu_div_round_rate fixed.
>
> drivers/clk/sunxi-ng/ccu_div.c | 22 +++++++++++++++++++---
> drivers/clk/sunxi-ng/ccu_div.h | 3 ++-
> 2 files changed, 21 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/clk/sunxi-ng/ccu_div.c
> b/drivers/clk/sunxi-ng/ccu_div.c
> index c0e5c10d0091..baa3cf96507b 100644
> --- a/drivers/clk/sunxi-ng/ccu_div.c
> +++ b/drivers/clk/sunxi-ng/ccu_div.c
> @@ -21,10 +21,18 @@ static unsigned long ccu_div_round_rate(struct
> ccu_mux_internal *mux,
> {
> struct ccu_div *cd = data;
>
> - return divider_round_rate_parent(&cd->common.hw, parent,
> + if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
> + rate *= cd->fixed_post_div;
> +
> + rate = divider_round_rate_parent(&cd->common.hw, parent,
> rate, parent_rate,
> cd->div.table, cd->div.width,
> cd->div.flags);
> +
> + if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
> + rate /= cd->fixed_post_div;
> +
> + return rate;
> }
>
> static void ccu_div_disable(struct clk_hw *hw)
> @@ -62,8 +70,13 @@ static unsigned long ccu_div_recalc_rate(struct
> clk_hw *hw,
> parent_rate = ccu_mux_helper_apply_prediv(&cd->common, &cd->mux, -1,
> parent_rate);
>
> - return divider_recalc_rate(hw, parent_rate, val, cd->div.table,
> - cd->div.flags);
> + val = divider_recalc_rate(hw, parent_rate, val, cd->div.table,
> + cd->div.flags);
> +
> + if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
> + val /= cd->fixed_post_div;
> +
> + return val;
> }
>
> static int ccu_div_determine_rate(struct clk_hw *hw,
> @@ -86,6 +99,9 @@ static int ccu_div_set_rate(struct clk_hw *hw,
> unsigned long rate,
> parent_rate = ccu_mux_helper_apply_prediv(&cd->common, &cd->mux, -1,
> parent_rate);
>
> + if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
> + rate *= cd->fixed_post_div;
> +
> val = divider_get_val(rate, parent_rate, cd->div.table,
> cd->div.width,
> cd->div.flags);
>
> diff --git a/drivers/clk/sunxi-ng/ccu_div.h
> b/drivers/clk/sunxi-ng/ccu_div.h
> index 08d074451204..f3a5028dcd14 100644
> --- a/drivers/clk/sunxi-ng/ccu_div.h
> +++ b/drivers/clk/sunxi-ng/ccu_div.h
> @@ -86,9 +86,10 @@ struct ccu_div_internal {
> struct ccu_div {
> u32 enable;
>
> - struct ccu_div_internal div;
> + struct ccu_div_internal div;
> struct ccu_mux_internal mux;
> struct ccu_common common;
> + unsigned int fixed_post_div;
> };
>
> #define SUNXI_CCU_DIV_TABLE_WITH_GATE(_struct, _name, _parent, _reg, \

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