netdev - Re: [PATCH 2/3] net: stmmac: qcom-ethqos: Enable RX programmable swap on qcs615

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Message-ID: <4b4ef1c1-a20b-4b65-ad37-b9aabe074ae1@kernel.org>
Date: Wed, 25 Dec 2024 12:37:52 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Yijie Yang <quic_yijiyang@...cinc.com>, Vinod Koul <vkoul@...nel.org>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>, Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konradybcio@...nel.org>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Jose Abreu <joabreu@...opsys.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>
Cc: netdev@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH 2/3] net: stmmac: qcom-ethqos: Enable RX programmable swap
 on qcs615

On 25/12/2024 11:04, Yijie Yang wrote:

>  static int qcom_ethqos_probe(struct platform_device *pdev)
>  {
> -	struct device_node *np = pdev->dev.of_node;
> +	struct device_node *np = pdev->dev.of_node, *root;
>  	const struct ethqos_emac_driver_data *data;
>  	struct plat_stmmacenet_data *plat_dat;
>  	struct stmmac_resources stmmac_res;
> @@ -810,6 +805,15 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
>  	ret = of_get_phy_mode(np, &ethqos->phy_mode);
>  	if (ret)
>  		return dev_err_probe(dev, ret, "Failed to get phy mode\n");
> +
> +	root = of_find_node_by_path("/");
> +	if (root && of_device_is_compatible(root, "qcom,sa8540p-ride"))

Nope, your drivers are not supposed to poke root compatibles. Drop and
fix your driver to behave correctly for all existing devices.

> +		ethqos->needs_rx_prog_swap = true;
> +	else
> +		ethqos->needs_rx_prog_swap =
Best regards,
Krzysztof