linux-kernel - Re: [linux-sunxi] [PATCH v5 1/6] clk: sunxi-ng: div: Add support for fixed post-divider

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Message-ID: <3126e83a-c50c-fb12-134b-0b53f0f7eed6@schinagl.nl>
Date:   Mon, 10 Jul 2017 10:13:24 +0200
From:   Olliver Schinagl <oliver@...inagl.nl>
To:     plaes@...es.org, Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...eaurora.org>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Maxime Ripard <maxime.ripard@...e-electrons.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Russell King <linux@...linux.org.uk>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        linux-clk@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     linux-sunxi@...glegroups.com, Jonathan Liu <net147@...il.com>
Subject: Re: [linux-sunxi] [PATCH v5 1/6] clk: sunxi-ng: div: Add support for
 fixed post-divider

Hey Plaes,

On 04-07-17 22:04, Priit Laes wrote:
> SATA clock on sun4i/sun7i is of type (parent) / M / 6 where
> 6 is fixed post-divider.
>
> Signed-off-by: Priit Laes <plaes@...es.org>
> ---
>  drivers/clk/sunxi-ng/ccu_div.c | 18 ++++++++++++++++--
>  drivers/clk/sunxi-ng/ccu_div.h |  3 ++-
>  2 files changed, 18 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/clk/sunxi-ng/ccu_div.c b/drivers/clk/sunxi-ng/ccu_div.c
> index c0e5c10..054b12a 100644
> --- a/drivers/clk/sunxi-ng/ccu_div.c
> +++ b/drivers/clk/sunxi-ng/ccu_div.c
> @@ -21,6 +21,9 @@ static unsigned long ccu_div_round_rate(struct ccu_mux_internal *mux,
>  {
>  	struct ccu_div *cd = data;
>
> +	if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
> +		rate /= cd->fixed_post_div;
> +
>  	return divider_round_rate_parent(&cd->common.hw, parent,
>  					 rate, parent_rate,
>  					 cd->div.table, cd->div.width,
> @@ -62,8 +65,13 @@ 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,
> @@ -71,6 +79,9 @@ static int ccu_div_determine_rate(struct clk_hw *hw,
>  {
>  	struct ccu_div *cd = hw_to_ccu_div(hw);
>
> +	if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
> +		req->rate *= cd->fixed_post_div;
> +
>  	return ccu_mux_helper_determine_rate(&cd->common, &cd->mux,
>  					     req, ccu_div_round_rate, cd);
>  }
> @@ -89,6 +100,9 @@ static int ccu_div_set_rate(struct clk_hw *hw, unsigned long rate,
>  	val = divider_get_val(rate, parent_rate, cd->div.table, cd->div.width,
>  			      cd->div.flags);
>
> +	if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV)
> +		val /= cd->fixed_post_div;
> +
>  	spin_lock_irqsave(cd->common.lock, flags);
>
>  	reg = readl(cd->common.base + cd->common.reg);
> diff --git a/drivers/clk/sunxi-ng/ccu_div.h b/drivers/clk/sunxi-ng/ccu_div.h
> index 08d0744..f3a5028 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,	\
>