linux-kernel - Re: [PATCH 2/4] arm64: dts: imx8mp: convert 'aips5' to 'aipstz5'

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Message-ID: <e25494da-9d27-4416-ac79-317c8b9a6653@kernel.org>
Date: Sun, 24 Aug 2025 13:29:15 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Laurentiu Mihalcea <laurentiumihalcea111@...il.com>,
 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>, Fabio Estevam <festevam@...il.com>,
 Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>
Cc: Pengutronix Kernel Team <kernel@...gutronix.de>,
 devicetree@...r.kernel.org, imx@...ts.linux.dev,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/4] arm64: dts: imx8mp: convert 'aips5' to 'aipstz5'

On 21/08/2025 12:56, Laurentiu Mihalcea wrote:
> From: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
> 
> AIPS5 is actually AIPSTZ5 as it offers some security-related
> configurations. Since these configurations need to be applied before
> accessing any of the peripherals on the bus, it's better to make AIPSTZ5
> be their parent instead of keeping AIPS5 and adding a child node for
> AIPSTZ5. Also, because of the security configurations, the address space
> of the bus has to be changed to that of the configuration registers.
> 
> Finally, since AIPSTZ5 belongs to the AUDIOMIX power domain, add the
> missing 'power-domains' property. The domain needs to be powered on before
> attempting to configure the security-related registers.
> 
> The DT node name is not changed to avoid potential issues with DTs in
> which this node is referenced.
> 
> Co-developed-by: Daniel Baluta <daniel.baluta@....com>
> Signed-off-by: Daniel Baluta <daniel.baluta@....com>
> Signed-off-by: Laurentiu Mihalcea <laurentiu.mihalcea@....com>
> Reviewed-by: Frank Li <Frank.Li@....com>

Where did it happen?

> ---
>  arch/arm64/boot/dts/freescale/imx8mp.dtsi | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp.dtsi b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> index bb24dba7338e..b62bb821cf61 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> @@ -1396,12 +1396,14 @@ eqos: ethernet@...f0000 {
>  			};
>  		};
>  
> -		aips5: bus@...00000 {
> -			compatible = "fsl,aips-bus", "simple-bus";


This breaks all the users. I understood explanation as "it is better",
no real reasons.

No, you cannot do that.

Best regards,
Krzysztof