linux-kernel - Re: [PATCH v3 1/6] arm64: dts: imx8mq: Add NOC node

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Message-ID: <5af9ae66-039c-2e94-6b69-d5a6b0f2a0b3@linaro.org>
Date:   Mon, 4 Jan 2021 16:53:03 +0200
From:   Georgi Djakov <georgi.djakov@...aro.org>
To:     Martin Kepplinger <martin.kepplinger@...i.sm>, robh@...nel.org,
        shawnguo@...nel.org, festevam@...il.com, catalin.marinas@....com,
        will@...nel.org, cdleonard@...il.com
Cc:     kernel@...gutronix.de, linux-imx@....com, kernel@...i.sm,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        Leonard Crestez <leonard.crestez@....com>
Subject: Re: [PATCH v3 1/6] arm64: dts: imx8mq: Add NOC node

On 12/10/20 12:09, Martin Kepplinger wrote:
> From: Leonard Crestez <leonard.crestez@....com>
> 
> Add initial support for dynamic frequency scaling of the main NOC
> on imx8mq.
> 
> Make DDRC the parent of the NOC (using passive governor) so that the
> main NOC is automatically scaled together with DDRC by default.
> 
> Support for proactive scaling via interconnect will come on top.
> 
> Signed-off-by: Leonard Crestez <leonard.crestez@....com>
> Signed-off-by: Martin Kepplinger <martin.kepplinger@...i.sm>

Acked-by: Georgi Djakov <georgi.djakov@...aro.org>

> ---
>   arch/arm64/boot/dts/freescale/imx8mq.dtsi | 22 ++++++++++++++++++++++
>   1 file changed, 22 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/freescale/imx8mq.dtsi b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> index a841a023e8e0..9c9d68a14e69 100644
> --- a/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> +++ b/arch/arm64/boot/dts/freescale/imx8mq.dtsi
> @@ -1158,6 +1158,28 @@
>   			};
>   		};
>   
> +		noc: interconnect@...00000 {
> +			compatible = "fsl,imx8mq-noc", "fsl,imx8m-noc";
> +			reg = <0x32700000 0x100000>;
> +			clocks = <&clk IMX8MQ_CLK_NOC>;
> +			fsl,ddrc = <&ddrc>;
> +			operating-points-v2 = <&noc_opp_table>;
> +
> +			noc_opp_table: opp-table {
> +				compatible = "operating-points-v2";
> +
> +				opp-133M {
> +					opp-hz = /bits/ 64 <133333333>;
> +				};
> +				opp-400M {
> +					opp-hz = /bits/ 64 <400000000>;
> +				};
> +				opp-800M {
> +					opp-hz = /bits/ 64 <800000000>;
> +				};
> +			};
> +		};
> +
>   		bus@...00000 { /* AIPS4 */
>   			compatible = "fsl,aips-bus", "simple-bus";
>   			reg = <0x32c00000 0x400000>;
>