linux-kernel - Re: [PATCH v2 3/6] clk: qcom: apss-ipq-pll: remove 'pll_type' field from struct 'apss_pll

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Message-ID: <CAA8EJprr4E1CM4f+eBzdRN41nm33xY-hRPQDn3peR94vLyJsYQ@mail.gmail.com>
Date: Thu, 21 Mar 2024 12:37:15 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Gabor Juhos <j4g8y7@...il.com>
Cc: Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Michael Turquette <mturquette@...libre.com>, Stephen Boyd <sboyd@...nel.org>, 
	linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/6] clk: qcom: apss-ipq-pll: remove 'pll_type' field
 from struct 'apss_pll_data'

On Thu, 21 Mar 2024 at 09:50, Gabor Juhos <j4g8y7@...il.com> wrote:
>
> The value of the 'pll_type' field of 'struct apps_pll_data'
> is used only by the probe function to decide which config
> function should be called for the actual PLL. However this
> can be derived also from the 'pll' field  which makes the
> 'pll_type' field redundant.
>
> Additionally, the CLK_ALPHA_PLL_TYPE_* enumeration values
> are meant to be used as indices to the 'clk_alpha_pll_regs'
> array so using those to define the pll type in this driver
> is misleading anyway.
>
> Change the probe function to use the 'pll' field to determine
> the configuration function to be used, and remove the
> 'pll_type' field to simplify the code.

I can't fully appreciate this idea. There can be cases when different
PLL types share the set of ops. I think having a type is more
versatile and makes the code more obvious.

>
> No functional changes.
>
> Signed-off-by: Gabor Juhos <j4g8y7@...il.com>
> ---
> Changes in v2:
>  - no changes
>  - Link to v1: https://lore.kernel.org/r/20240318-apss-ipq-pll-cleanup-v1-3-52f795429d5d@gmail.com
> ---
>  drivers/clk/qcom/apss-ipq-pll.c | 12 +++---------
>  1 file changed, 3 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/clk/qcom/apss-ipq-pll.c b/drivers/clk/qcom/apss-ipq-pll.c
> index 8cf17374a2e2a..816b0d1f8d8c8 100644
> --- a/drivers/clk/qcom/apss-ipq-pll.c
> +++ b/drivers/clk/qcom/apss-ipq-pll.c
> @@ -131,37 +131,31 @@ static const struct alpha_pll_config ipq9574_pll_config = {
>  };
>
>  struct apss_pll_data {
> -       int pll_type;
>         struct clk_alpha_pll *pll;
>         const struct alpha_pll_config *pll_config;
>  };
>
>  static const struct apss_pll_data ipq5018_pll_data = {
> -       .pll_type = CLK_ALPHA_PLL_TYPE_STROMER,
>         .pll = &ipq_pll_stromer,
>         .pll_config = &ipq5018_pll_config,
>  };
>
>  static struct apss_pll_data ipq5332_pll_data = {
> -       .pll_type = CLK_ALPHA_PLL_TYPE_STROMER_PLUS,
>         .pll = &ipq_pll_stromer_plus,
>         .pll_config = &ipq5332_pll_config,
>  };
>
>  static struct apss_pll_data ipq8074_pll_data = {
> -       .pll_type = CLK_ALPHA_PLL_TYPE_HUAYRA,
>         .pll = &ipq_pll_huayra,
>         .pll_config = &ipq8074_pll_config,
>  };
>
>  static struct apss_pll_data ipq6018_pll_data = {
> -       .pll_type = CLK_ALPHA_PLL_TYPE_HUAYRA,
>         .pll = &ipq_pll_huayra,
>         .pll_config = &ipq6018_pll_config,
>  };
>
>  static struct apss_pll_data ipq9574_pll_data = {
> -       .pll_type = CLK_ALPHA_PLL_TYPE_HUAYRA,
>         .pll = &ipq_pll_huayra,
>         .pll_config = &ipq9574_pll_config,
>  };
> @@ -194,10 +188,10 @@ static int apss_ipq_pll_probe(struct platform_device *pdev)
>         if (!data)
>                 return -ENODEV;
>
> -       if (data->pll_type == CLK_ALPHA_PLL_TYPE_HUAYRA)
> +       if (data->pll == &ipq_pll_huayra)
>                 clk_alpha_pll_configure(data->pll, regmap, data->pll_config);
> -       else if (data->pll_type == CLK_ALPHA_PLL_TYPE_STROMER ||
> -                data->pll_type == CLK_ALPHA_PLL_TYPE_STROMER_PLUS)
> +       else if (data->pll == &ipq_pll_stromer ||
> +                data->pll == &ipq_pll_stromer_plus)
>                 clk_stromer_pll_configure(data->pll, regmap, data->pll_config);
>
>         ret = devm_clk_register_regmap(dev, &data->pll->clkr);
>
> --
> 2.44.0
>


-- 
With best wishes
Dmitry