linux-kernel - Re: [PATCH 4/6] PCI: qcom: Add support for IPQ5018

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Date:   Mon, 9 Oct 2023 23:02:59 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Nitheesh Sekar <quic_nsekar@...cinc.com>
Cc:     agross@...nel.org, andersson@...nel.org, konrad.dybcio@...aro.org,
        lpieralisi@...nel.org, kw@...ux.com, robh@...nel.org,
        bhelgaas@...gle.com, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, vkoul@...nel.org, kishon@...nel.org,
        p.zabel@...gutronix.de, quic_srichara@...cinc.com,
        quic_varada@...cinc.com, quic_ipkumar@...cinc.com,
        linux-arm-msm@...r.kernel.org, linux-pci@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-phy@...ts.infradead.org,
        Anusha Rao <quic_anusha@...cinc.com>,
        Devi Priya <quic_devipriy@...cinc.com>
Subject: Re: [PATCH 4/6] PCI: qcom: Add support for IPQ5018

On Tue, Oct 03, 2023 at 05:38:44PM +0530, Nitheesh Sekar wrote:
> Added a new compatible 'qcom,pcie-ipq5018' and modified
> get_resources of 'ops 2_9_0' to get the clocks from the
> device-tree.
> 

As per Documentation/process/submitting-patches.rst:

Describe your changes in imperative mood, e.g. "make xyzzy do frotz"
instead of "[This patch] makes xyzzy do frotz" or "[I] changed xyzzy
to do frotz", as if you are giving orders to the codebase to change
its behaviour.

Also, please elaborate your change in a detailed manner. For instance, saying
that you modified "get_resources of 'ops 2_9_0' to get the clocks from the
devicetree" is not sufficient since all clocks are being parsed based on the
devicetree info only.

- Mani

> Co-developed-by: Anusha Rao <quic_anusha@...cinc.com>
> Signed-off-by: Anusha Rao <quic_anusha@...cinc.com>
> Co-developed-by: Devi Priya <quic_devipriy@...cinc.com>
> Signed-off-by: Devi Priya <quic_devipriy@...cinc.com>
> Signed-off-by: Nitheesh Sekar <quic_nsekar@...cinc.com>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 22 ++++++++--------------
>  1 file changed, 8 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index e2f29404c84e..bb0717190920 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -197,10 +197,10 @@ struct qcom_pcie_resources_2_7_0 {
>  	struct reset_control *rst;
>  };
>  
> -#define QCOM_PCIE_2_9_0_MAX_CLOCKS		5
>  struct qcom_pcie_resources_2_9_0 {
> -	struct clk_bulk_data clks[QCOM_PCIE_2_9_0_MAX_CLOCKS];
> +	struct clk_bulk_data *clks;
>  	struct reset_control *rst;
> +	int num_clks;
>  };
>  
>  union qcom_pcie_resources {
> @@ -1048,17 +1048,10 @@ static int qcom_pcie_get_resources_2_9_0(struct qcom_pcie *pcie)
>  	struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
>  	struct dw_pcie *pci = pcie->pci;
>  	struct device *dev = pci->dev;
> -	int ret;
>  
> -	res->clks[0].id = "iface";
> -	res->clks[1].id = "axi_m";
> -	res->clks[2].id = "axi_s";
> -	res->clks[3].id = "axi_bridge";
> -	res->clks[4].id = "rchng";
> -
> -	ret = devm_clk_bulk_get(dev, ARRAY_SIZE(res->clks), res->clks);
> -	if (ret < 0)
> -		return ret;
> +	res->num_clks = devm_clk_bulk_get_all(dev, &res->clks);
> +	if (res->num_clks < 0)
> +		return res->num_clks;
>  
>  	res->rst = devm_reset_control_array_get_exclusive(dev);
>  	if (IS_ERR(res->rst))
> @@ -1071,7 +1064,7 @@ static void qcom_pcie_deinit_2_9_0(struct qcom_pcie *pcie)
>  {
>  	struct qcom_pcie_resources_2_9_0 *res = &pcie->res.v2_9_0;
>  
> -	clk_bulk_disable_unprepare(ARRAY_SIZE(res->clks), res->clks);
> +	clk_bulk_disable_unprepare(res->num_clks, res->clks);
>  }
>  
>  static int qcom_pcie_init_2_9_0(struct qcom_pcie *pcie)
> @@ -1100,7 +1093,7 @@ static int qcom_pcie_init_2_9_0(struct qcom_pcie *pcie)
>  
>  	usleep_range(2000, 2500);
>  
> -	return clk_bulk_prepare_enable(ARRAY_SIZE(res->clks), res->clks);
> +	return clk_bulk_prepare_enable(res->num_clks, res->clks);
>  }
>  
>  static int qcom_pcie_post_init_2_9_0(struct qcom_pcie *pcie)
> @@ -1605,6 +1598,7 @@ static const struct of_device_id qcom_pcie_match[] = {
>  	{ .compatible = "qcom,pcie-apq8064", .data = &cfg_2_1_0 },
>  	{ .compatible = "qcom,pcie-apq8084", .data = &cfg_1_0_0 },
>  	{ .compatible = "qcom,pcie-ipq4019", .data = &cfg_2_4_0 },
> +	{ .compatible = "qcom,pcie-ipq5018", .data = &cfg_2_9_0 },
>  	{ .compatible = "qcom,pcie-ipq6018", .data = &cfg_2_9_0 },
>  	{ .compatible = "qcom,pcie-ipq8064", .data = &cfg_2_1_0 },
>  	{ .compatible = "qcom,pcie-ipq8064-v2", .data = &cfg_2_1_0 },
> -- 
> 2.17.1
> 

-- 
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