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Message-ID: <27f2e3a3-0791-4278-adb2-55ed76820a3a@linaro.org>
Date:   Tue, 5 Dec 2023 09:45:44 +0100
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Subject: Re: [PATCH RFC 01/10] dt-bindings: gpu: Add PowerVR Series5 SGX GPUs
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To:     Tony Lindgren <tony@atomide.com>
Cc:     Andrew Davis <afd@ti.com>, Frank Binns <frank.binns@imgtec.com>,
        Donald Robson <donald.robson@imgtec.com>,
        Matt Coster <matt.coster@imgtec.com>,
        "H . Nikolaus Schaller" <hns@goldelico.com>,
        Adam Ford <aford173@gmail.com>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Maxime Ripard <mripard@kernel.org>,
        Thomas Zimmermann <tzimmermann@suse.de>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Chen-Yu Tsai <wens@csie.org>,
        Jernej Skrabec <jernej.skrabec@gmail.com>,
        Samuel Holland <samuel@sholland.org>,
        =?UTF-8?Q?Beno=C3=AEt_Cousson?= <bcousson@baylibre.com>,
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        Tero Kristo <kristo@kernel.org>,
        Paul Cercueil <paul@crapouillou.net>,
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From:   Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
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In-Reply-To: <20231205083001.GP5169@atomide.com>
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Precedence: bulk

On 05/12/2023 09:30, Tony Lindgren wrote:
> * Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> [231205 08:16]:
>> On 05/12/2023 09:10, Tony Lindgren wrote:
>>> * Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org> [231205 08:03]:
>>>> What does runtime PM have to do with it? If runtime PM enables clocks,
>>>> these are real signals and not optional.
>>>
>>> Runtime PM propagates to the parent device.
>>
>> Then it is not really relevant to the hardware talk here, unless you put
>> this device clocks in parent node, but then it's just wrong hardware
>> description.
> 
> No it's not. The interconnect target module may have one or more separate

Interconnects are not parents of devices, so I still don't get why do
you bring it here.

> devices with the same shared clocks. See for example the am3 usb module that
> has usb controllers, phys and dma at target-module@47400000 in am33xx.dtsi.

There is no interconnect-cells there, so why do we talk about
interconnect here?

> 
> Sure the clock nodes can be there for the child IP, but they won't do
> anything. And still need to be managed separately by the device driver if
> added.

So if OS does not have runtime PM, the bindings are wrong? Bindings
should not depend on some particular feature of some particular OS.

Best regards,
Krzysztof