linux-kernel - Re: [PATCH RFC 01/10] dt-bindings: gpu: Add PowerVR Series5 SGX GPUs

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Date:   Tue, 5 Dec 2023 10:02:46 +0100
From:   Andreas Kemnade <andreas@...nade.info>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Tony Lindgren <tony@...mide.com>, Andrew Davis <afd@...com>,
        Frank Binns <frank.binns@...tec.com>,
        Donald Robson <donald.robson@...tec.com>,
        Matt Coster <matt.coster@...tec.com>,
        "H . Nikolaus Schaller" <hns@...delico.com>,
        Adam Ford <aford173@...il.com>,
        Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Samuel Holland <samuel@...lland.org>,
        Benoît Cousson <bcousson@...libre.com>,
        Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Paul Cercueil <paul@...pouillou.net>,
        dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-omap@...r.kernel.org,
        linux-mips@...r.kernel.org
Subject: Re: [PATCH RFC 01/10] dt-bindings: gpu: Add PowerVR Series5 SGX
 GPUs

On Tue, 5 Dec 2023 09:45:44 +0100
Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org> wrote:

> > 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.

Any user of the devicetree sees that there is a parent and the parent needs
to be enabled by some mechanism.
E.g. I2c devices do not specify the clocks of the parent (the i2c master)

Maybe it is just more fine-grained on omap.

look e.g. at ti/omap/omap4-l4.dtsi
there are target-module@...x
with the devices as a child and a clock in the parent.

Regards,
Andreas