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 01:13:20 +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

Hi Krzysztof,

[...]

> +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.

... and... "*please* update your DTB", the user might get upset
and out of sheer spite, decides not to do it – just because! :)

Andi

> +	}