linux-kernel - Re: [PATCH 1/3] clk: imx: composite-8m: Add support to determine

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Date:   Mon, 20 Mar 2023 13:45:20 +0800
From:   Peng Fan <peng.fan@....nxp.com>
To:     Adam Ford <aford173@...il.com>, linux-clk@...r.kernel.org
Cc:     aford@...conembedded.com, Abel Vesa <abelvesa@...nel.org>,
        Peng Fan <peng.fan@....com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] clk: imx: composite-8m: Add support to determine_rate



On 3/19/2023 9:21 PM, Adam Ford wrote:
> Similar to imx/clk-composite-93 and imx/clk-divider-gate, the
> imx8m_clk_composite_divider_ops can support determine_rate.
> Without this the parent clocks are set to a fixed value, and
> if a consumer needs a slower reate, the clock is divided, but
> the division is only as good as the parent clock rate.
> 
> With this added, the system can attempt to adjust the parent rate
> if the proper flags are set which can lead to a more precise clock
> value.
> 
> Signed-off-by: Adam Ford <aford173@...il.com>
> 
> diff --git a/drivers/clk/imx/clk-composite-8m.c b/drivers/clk/imx/clk-composite-8m.c
> index cbf0d7955a00..3b63e47f088f 100644
> --- a/drivers/clk/imx/clk-composite-8m.c
> +++ b/drivers/clk/imx/clk-composite-8m.c
> @@ -119,10 +119,17 @@ static int imx8m_clk_composite_divider_set_rate(struct clk_hw *hw,
>   	return ret;
>   }
>   
> +static int clk_divider_determine_rate(struct clk_hw *hw,
> +				      struct clk_rate_request *req)
> +{
> +	return clk_divider_ops.determine_rate(hw, req);
> +}
> +
>   static const struct clk_ops imx8m_clk_composite_divider_ops = {
>   	.recalc_rate = imx8m_clk_composite_divider_recalc_rate,
>   	.round_rate = imx8m_clk_composite_divider_round_rate,
>   	.set_rate = imx8m_clk_composite_divider_set_rate,
> +	.determine_rate = clk_divider_determine_rate,

Please align the name with imx8m_ as prefix. Other than that:
Reviewed-by: Peng Fan <peng.fan@....com>

>   };
>   
>   static u8 imx8m_clk_composite_mux_get_parent(struct clk_hw *hw)