linux-kernel - Re: [PATCH v4 4/6] arm64: dts: imx8mp: convert 'aips5' to 'aipstz5'

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Message-ID: <Z+xY4wZ8ZFSOJhGS@lizhi-Precision-Tower-5810>
Date: Tue, 1 Apr 2025 17:21:39 -0400
From: Frank Li <Frank.li@....com>
To: Laurentiu Mihalcea <laurentiumihalcea111@...il.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>,
	Fabio Estevam <festevam@...il.com>,
	Daniel Baluta <daniel.baluta@....com>,
	Shengjiu Wang <shengjiu.wang@....com>,
	Marco Felsch <m.felsch@...gutronix.de>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	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 v4 4/6] arm64: dts: imx8mp: convert 'aips5' to 'aipstz5'

On Tue, Apr 01, 2025 at 11:44:02AM -0400, 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>

> ---
>  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 ce6793b2d57e..aa7940c65f2d 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mp.dtsi
> @@ -1399,12 +1399,14 @@ eqos: ethernet@...f0000 {
>  			};
>  		};
>
> -		aips5: bus@...00000 {
> -			compatible = "fsl,aips-bus", "simple-bus";
> -			reg = <0x30c00000 0x400000>;
> +		aips5: bus@...f0000 {
> +			compatible = "fsl,imx8mp-aipstz";
> +			reg = <0x30df0000 0x10000>;
> +			power-domains = <&pgc_audio>;
>  			#address-cells = <1>;
>  			#size-cells = <1>;
> -			ranges;
> +			#access-controller-cells = <3>;
> +			ranges = <0x30c00000 0x30c00000 0x400000>;
>
>  			spba-bus@...00000 {
>  				compatible = "fsl,spba-bus", "simple-bus";
> --
> 2.34.1
>