linux-kernel - Re: [PATCH v2 3/3] media: exynos4-is: fimc-is: replace duplicate pmu node with phandle

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Message-ID: <d198429e-d8ca-aeea-e59b-a241dacde658@linaro.org>
Date:   Tue, 8 Aug 2023 15:31:24 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Andi Shyti <andi.shyti@...nel.org>
Cc:     Sylwester Nawrocki <s.nawrocki@...sung.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/3] media: exynos4-is: fimc-is: replace duplicate pmu
 node with phandle

On 08/08/2023 13:42, Andi Shyti wrote:
>>>> +static void __iomem *fimc_is_get_pmu_regs(struct device *dev)
>>>> +{
>>>> +	struct device_node *node;
>>>> +	void __iomem *regs;
>>>> +
>>>> +	node = of_parse_phandle(dev->of_node, "samsung,pmu-syscon", 0);
>>>> +	if (!node) {
>>>> +		dev_warn(dev, "Finding PMU node via deprecated method, update your DTB\n");
>>>> +		node = of_get_child_by_name(dev->of_node, "pmu");
>>>> +		if (!node)
>>>> +			return IOMEM_ERR_PTR(-ENODEV);
>>>
>>> in my opinion this should be:
>>>
>>> 		...
>>> 		if (!node)
>>> 			return IOMEM_ERR_PTR(-ENODEV);
>>>
>>> 		dev_warn(dev, "Finding PMU node via deprecated method, update your DTB\n");
>>>
>>> Because if you don't have both "samsung,pmu-syscon and "pmu" then
>>> the warning should not be printed and you need to return -ENODEV.
>>
>> Why not? Warning is correct - the driver is trying to find, thus
>> continuous tense "Finding", PMU node via old method.
> 
> Alright, I'll go along with what you're suggesting, but I have to
> say, I find it misleading.
> 
> From what I understand, you're requesting an update to the dtb
> because it's using deprecated methods. However, the reality might 
> be that the node is not present in any method at all.
> 
> Your statement would be accurate if you failed to find the
> previous method but then did end up finding it.
> 
> Relying on the present continuous tense for clarity is a bold
> move, don't you think? :)

I just don't think it matters and is not worth resending.

Best regards,
Krzysztof