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

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Date:   Fri, 11 Aug 2023 11:49:28 +0200
From:   Hans Verkuil <hverkuil@...all.nl>
To:     Andi Shyti <andi.shyti@...nel.org>,
        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,

On 08/08/2023 01:13, Andi Shyti wrote:
> 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.

I agree with Andi for this part.

The only time you want to see this message is if samsung,pmu-syscon is
missing AND pmu is present. If both are missing, then just return ENODEV as
it was before.

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

I don't care about this bit. I guess it doesn't hurt to add 'please', but
I accept it either way.

Regards,

	Hans

> 
> Andi
> 
>> +	}