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

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Date:   Tue, 15 Aug 2023 08:02:00 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Hans Verkuil <hverkuil@...all.nl>,
        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 11/08/2023 11:49, Hans Verkuil wrote:
> 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.

OK, understood. I will send a v3.

Best regards,
Krzysztof