linux-kernel - Re: [PATCH 2/7] phy: qcom: qmp-pcie: refactor clock register code

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Message-ID: <CAA8EJpqbhc_Y+EBTdz1WTnAnZN=vkTUAzc6feH4NYgbdR-ZibQ@mail.gmail.com>
Date: Tue, 19 Mar 2024 12:50:48 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Neil Armstrong <neil.armstrong@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org, 
	devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/7] phy: qcom: qmp-pcie: refactor clock register code

On Tue, 19 Mar 2024 at 12:45, Neil Armstrong <neil.armstrong@...aro.org> wrote:
>
> The PCIe Gen4x2 PHY found in the SM8[456]50 SoCs have a second clock,
> in order to expose it, split the current clock registering in two parts:
> - CCF clock registering
> - DT clock registering
>
> Also switch to devm_of_clk_add_hw_provider().
>
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>  drivers/phy/qualcomm/phy-qcom-qmp-pcie.c | 27 +++++++++++----------------
>  1 file changed, 11 insertions(+), 16 deletions(-)
>
> diff --git a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> index 8836bb1ff0cc..079b3e306489 100644
> --- a/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> +++ b/drivers/phy/qualcomm/phy-qcom-qmp-pcie.c
> @@ -3635,11 +3635,6 @@ static int qmp_pcie_clk_init(struct qmp_pcie *qmp)
>         return devm_clk_bulk_get_optional(dev, num, qmp->clks);
>  }
>
> -static void phy_clk_release_provider(void *res)
> -{
> -       of_clk_del_provider(res);
> -}
> -
>  /*
>   * Register a fixed rate pipe clock.
>   *
> @@ -3664,7 +3659,7 @@ static int phy_pipe_clk_register(struct qmp_pcie *qmp, struct device_node *np)
>         struct clk_init_data init = { };
>         int ret;
>
> -       ret = of_property_read_string(np, "clock-output-names", &init.name);
> +       ret = of_property_read_string_index(np, "clock-output-names", 0, &init.name);
>         if (ret) {
>                 dev_err(qmp->dev, "%pOFn: No clock-output-names\n", np);
>                 return ret;
> @@ -3683,19 +3678,19 @@ static int phy_pipe_clk_register(struct qmp_pcie *qmp, struct device_node *np)
>
>         fixed->hw.init = &init;
>
> -       ret = devm_clk_hw_register(qmp->dev, &fixed->hw);
> -       if (ret)
> -               return ret;
> +       return devm_clk_hw_register(qmp->dev, &fixed->hw);
> +}
>
> -       ret = of_clk_add_hw_provider(np, of_clk_hw_simple_get, &fixed->hw);
> +static int qmp_pcie_register_clocks(struct qmp_pcie *qmp, struct device_node *np)
> +{
> +       int ret;
> +
> +       ret = phy_pipe_clk_register(qmp, np);
>         if (ret)
>                 return ret;
>
> -       /*
> -        * Roll a devm action because the clock provider is the child node, but
> -        * the child node is not actually a device.
> -        */
> -       return devm_add_action_or_reset(qmp->dev, phy_clk_release_provider, np);
> +       return devm_of_clk_add_hw_provider(qmp->dev, of_clk_hw_simple_get,
> +                                          &qmp->pipe_clk_fixed.hw);

No. The driver has to register a clock provider at the np rather than
at dev->of_node. Otherwise legacy DT will be broken.

>  }
>
>  static int qmp_pcie_parse_dt_legacy(struct qmp_pcie *qmp, struct device_node *np)
> @@ -3899,7 +3894,7 @@ static int qmp_pcie_probe(struct platform_device *pdev)
>         if (ret)
>                 goto err_node_put;
>
> -       ret = phy_pipe_clk_register(qmp, np);
> +       ret = qmp_pcie_register_clocks(qmp, np);
>         if (ret)
>                 goto err_node_put;
>
>
> --
> 2.34.1
>
>


-- 
With best wishes
Dmitry