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

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Message-ID: <df1e2fbd-7fae-4910-9908-10fdb78e4299@kernel.org>
Date: Fri, 27 Dec 2024 08:03:15 +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 26/12/2024 03:29, Yijie Yang wrote:
> 
> 
> On 2024-12-25 19:37, Krzysztof Kozlowski wrote:
>> 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.
>>
> 
> Since this change introduces a new flag in the DTS, we must maintain ABI 
> compatibility with the kernel. The new flag is specific to the board, so 

It's not, I don't see it specific to the board in the bindings.

> I need to ensure root nodes are matched to allow older boards to 
> continue functioning as before. I'm happy to adopt that approach if 
> there are any more elegant solutions.

I don't think you understood the problem. Why you are not handling this
for my board, sa8775p-rideX and sa8225-pre-ride-yellow-shrimp?

Best regards,
Krzysztof