linux-kernel - Re: [PATCH v2 04/10] arm64: dts: imx8mn: Add access-controller references

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Message-ID: <8037692.EvYhyI6sBW@steina-w>
Date: Fri, 07 Feb 2025 13:37:27 +0100
From: Alexander Stein <alexander.stein@...tq-group.com>
To: Peng Fan <peng.fan@....nxp.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam <festevam@...il.com>, Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, devicetree@...r.kernel.org, imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 04/10] arm64: dts: imx8mn: Add access-controller references

Hi Peng,

Am Freitag, 7. Februar 2025, 13:02:13 CET schrieb Peng Fan:
> On Fri, Feb 07, 2025 at 09:36:09AM +0100, Alexander Stein wrote:
> >Mark ocotp as a access-controller and add references on peripherals
> >which can be disabled (fused).
> 
> I am not sure whether gpcv2 changes should be included in this patchset
> or not. Just add access-controller for fused IP will not work.

Well, I was able to successfully boot a i.MX8M Nano DualLite.

> i.MX8M BLK-CTRL/GPC will hang if the related power domain is still touched
> by kernel. The pgc can't power up/down because clock is gated. 

Well, with GPU node disabled, no one should enable the power domain.
But to be on the safe side I would also add access-controllers to the
corresponding power domains as well.

> This comment also apply to i.MX8MM/P.

Sure. Do you have any information what is actually disabled by those fused?
It seems it's the IP and their power domains. Anything else?

Best regards,
Alexander
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