linux-kernel - Re: [PATCH v3 4/7] PCI: qcom: Add support for IPQ9574

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Date: Mon, 15 Apr 2024 23:04:53 +0300
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Alexandru Gagniuc <mr.nuke.me@...il.com>
Cc: Bjorn Andersson <andersson@...nel.org>, Konrad Dybcio <konrad.dybcio@...aro.org>, 
	Lorenzo Pieralisi <lpieralisi@...nel.org>, Krzysztof Wilczyński <kw@...ux.com>, 
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Vinod Koul <vkoul@...nel.org>, 
	Kishon Vijay Abraham I <kishon@...nel.org>, Michael Turquette <mturquette@...libre.com>, 
	Stephen Boyd <sboyd@...nel.org>, Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>, 
	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, linux-clk@...r.kernel.org
Subject: Re: [PATCH v3 4/7] PCI: qcom: Add support for IPQ9574

On Mon, 15 Apr 2024 at 21:22, Alexandru Gagniuc <mr.nuke.me@...il.com> wrote:
>
> Add support for the PCIe on IPQ9574. The main difference from ipq6018
> is that the "iface" clock is not necessarry. Add a special case in
> qcom_pcie_get_resources_2_9_0() to handle this.
>
> Signed-off-by: Alexandru Gagniuc <mr.nuke.me@...il.com>
> ---
>  drivers/pci/controller/dwc/pcie-qcom.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/pci/controller/dwc/pcie-qcom.c b/drivers/pci/controller/dwc/pcie-qcom.c
> index 14772edcf0d3..10560d6d6336 100644
> --- a/drivers/pci/controller/dwc/pcie-qcom.c
> +++ b/drivers/pci/controller/dwc/pcie-qcom.c
> @@ -1101,15 +1101,19 @@ 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;
> +       int ret, num_clks = ARRAY_SIZE(res->clks) - 1;
>
> -       res->clks[0].id = "iface";
> +       res->clks[0].id = "rchng";
>         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 (!of_device_is_compatible(dev->of_node, "qcom,pcie-ipq9574")) {
> +               res->clks[4].id = "iface";
> +               num_clks++;
> +       }
> +
> +       ret = devm_clk_bulk_get(dev, num_clks, res->clks);

Just use devm_clk_bulk_get_optional() here.

>         if (ret < 0)
>                 return ret;
>
> @@ -1664,6 +1668,7 @@ static const struct of_device_id qcom_pcie_match[] = {
>         { .compatible = "qcom,pcie-ipq8064-v2", .data = &cfg_2_1_0 },
>         { .compatible = "qcom,pcie-ipq8074", .data = &cfg_2_3_3 },
>         { .compatible = "qcom,pcie-ipq8074-gen3", .data = &cfg_2_9_0 },
> +       { .compatible = "qcom,pcie-ipq9574", .data = &cfg_2_9_0 },
>         { .compatible = "qcom,pcie-msm8996", .data = &cfg_2_3_2 },
>         { .compatible = "qcom,pcie-qcs404", .data = &cfg_2_4_0 },
>         { .compatible = "qcom,pcie-sa8540p", .data = &cfg_sc8280xp },
> --
> 2.40.1
>
>


-- 
With best wishes
Dmitry