linux-kernel - Re: [PATCH v4 10/16] clk: qcom: clk-rcg: add clk_rcg_floor

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Message-ID: <YhcCXGWJhMBDCp6k@builder.lan>
Date:   Wed, 23 Feb 2022 21:58:20 -0600
From:   Bjorn Andersson <bjorn.andersson@...aro.org>
To:     Ansuel Smith <ansuelsmth@...il.com>
Cc:     Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Taniya Das <tdas@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 10/16] clk: qcom: clk-rcg: add clk_rcg_floor_ops ops

On Thu 17 Feb 17:56 CST 2022, Ansuel Smith wrote:

> Add clk_rcg_floor_ops for clock that can't provide a stable freq and
> require to use a floor freq to provide the requested frequency.
> 

Reviewed-by: Bjorn Andersson <bjorn.andersson@...aro.org>

> Signed-off-by: Ansuel Smith <ansuelsmth@...il.com>
> ---
>  drivers/clk/qcom/clk-rcg.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/drivers/clk/qcom/clk-rcg.c b/drivers/clk/qcom/clk-rcg.c
> index a9d181d6be21..88845baa7f84 100644
> --- a/drivers/clk/qcom/clk-rcg.c
> +++ b/drivers/clk/qcom/clk-rcg.c
> @@ -526,6 +526,19 @@ static int clk_rcg_set_rate(struct clk_hw *hw, unsigned long rate,
>  	return __clk_rcg_set_rate(rcg, f);
>  }
>  
> +static int clk_rcg_set_floor_rate(struct clk_hw *hw, unsigned long rate,
> +				  unsigned long parent_rate)
> +{
> +	struct clk_rcg *rcg = to_clk_rcg(hw);
> +	const struct freq_tbl *f;
> +
> +	f = qcom_find_freq_floor(rcg->freq_tbl, rate);
> +	if (!f)
> +		return -EINVAL;
> +
> +	return __clk_rcg_set_rate(rcg, f);
> +}
> +
>  static int clk_rcg_bypass_set_rate(struct clk_hw *hw, unsigned long rate,
>  				unsigned long parent_rate)
>  {
> @@ -816,6 +829,17 @@ const struct clk_ops clk_rcg_ops = {
>  };
>  EXPORT_SYMBOL_GPL(clk_rcg_ops);
>  
> +const struct clk_ops clk_rcg_floor_ops = {
> +	.enable = clk_enable_regmap,
> +	.disable = clk_disable_regmap,
> +	.get_parent = clk_rcg_get_parent,
> +	.set_parent = clk_rcg_set_parent,
> +	.recalc_rate = clk_rcg_recalc_rate,
> +	.determine_rate = clk_rcg_determine_rate,
> +	.set_rate = clk_rcg_set_floor_rate,
> +};
> +EXPORT_SYMBOL_GPL(clk_rcg_floor_ops);
> +
>  const struct clk_ops clk_rcg_bypass_ops = {
>  	.enable = clk_enable_regmap,
>  	.disable = clk_disable_regmap,
> -- 
> 2.34.1
>