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

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Date:   Tue, 8 Aug 2023 13:42:01 +0200
From:   Andi Shyti <andi.shyti@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.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

> >> +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? :)

Andi

> > ... and... "*please* update your DTB", the user might get upset
> > and out of sheer spite, decides not to do it – just because! :)
> 
> The message is already long enough, why making it longer? Anyone who
> ships DTS outside of Linux kernel is doomed anyway...
> 
> Best regards,
> Krzysztof
>