linux-kernel - Re: [PATCH v5 2/2] PCI: qcom: Add support for multi-root port

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Message-ID: <cbf32980-8608-42ba-99c7-deed56afae32@oss.qualcomm.com>
Date: Thu, 3 Jul 2025 09:48:17 +0530
From: Krishna Chaitanya Chundru <krishna.chundru@....qualcomm.com>
To: Manivannan Sadhasivam <mani@...nel.org>
Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kwilczynski@...nel.org>,
        Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley
 <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        cros-qcom-dts-watchers@...omium.org, linux-arm-msm@...r.kernel.org,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, quic_vbadigan@...cinc.com,
        quic_mrana@...cinc.com
Subject: Re: [PATCH v5 2/2] PCI: qcom: Add support for multi-root port



On 7/2/2025 9:03 PM, Manivannan Sadhasivam wrote:
> On Wed, Jul 02, 2025 at 04:50:42PM GMT, Krishna Chaitanya Chundru wrote:
> 
> [...]
> 
>> -	ret = phy_init(pcie->phy);
>> -	if (ret)
>> -		goto err_pm_runtime_put;
>> +	for_each_available_child_of_node(dev->of_node, of_port) {
>> +		ret = qcom_pcie_parse_port(pcie, of_port);
>> +		of_node_put(of_port);
>> +		if (ret) {
>> +			if (ret != -ENOENT) {
>> +				dev_err_probe(pci->dev, ret,
>> +					      "Failed to parse port nodes %d\n",
>> +					      ret);
>> +				goto err_port_del;
>> +			}
>> +			break;
>> +		}
>> +	}
>> +
>> +	/*
>> +	 * In the case of properties not populated in root port, fallback to the
>> +	 * legacy method of parsing the host bridge node. This is to maintain DT
>> +	 * backwards compatibility.
>> +	 */
>> +	if (ret) {
>> +		pcie->phy = devm_phy_optional_get(dev, "pciephy");
>> +		if (IS_ERR(pcie->phy)) {
>> +			ret = PTR_ERR(pcie->phy);
>> +			goto err_pm_runtime_put;
> 
> Shouldn't this and below be err_port_del?
> 
This is a legacy way of parsing property, if the execution
comes here means the port parsing has failed and ports are not created.
so err_port_del will not have any effect.

- Krishna Chaitanya.
> - Mani
>