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

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Message-ID: <10bcbff4-4e8d-4899-bf14-b28b59b5614a@linaro.org>
Date: Tue, 19 Mar 2024 11:53:56 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...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 19/03/2024 11:50, Dmitry Baryshkov wrote:
> 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.

Indeed

Thx
Neil

> 
>>   }
>>
>>   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
>>
>>
> 
>