linux-kernel - Re: [PATCH v5 2/5] arm64: dts: ti: k3-am62 : Add M4F remote proc node

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Date:   Tue, 8 Aug 2023 07:07:48 -0500
From:   Nishanth Menon <nm@...com>
To:     Hari Nagalla <hnagalla@...com>
CC:     <andersson@...nel.org>, <mathieu.poirier@...aro.org>,
        <p.zabel@...gutronix.de>, <martyn.welch@...labora.com>,
        <vigneshr@...com>, <kristo@...nel.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH v5 2/5] arm64: dts: ti: k3-am62 : Add M4F remote proc node

On 23:45-20230807, Hari Nagalla wrote:
> The AM62x SoCs of the TI K3 family have a Cortex M4F core in the MCU
> domain. This core can be used by non safety applications as a remote
> processor. When used as a remote processor with virtio/rpmessage IPC,
> two carveout reserved memory nodes are needed. The first region is used
> as a DMA pool for the rproc device, and the second region will furnish
> the static carveout regions for the firmware memory.
> 
> The current carveout addresses and sizes are defined statically for
> each rproc device. The M4F processor do not have an MMU, and as such
> require the exact memory used by the firmware to be set-aside.
> 
> Signed-off-by: Hari Nagalla <hnagalla@...com>
> ---
> Changes in v5:
>  - Add the M4F device tree node patches to the patch list 

This will need to be reviewed after driver changes are complete and
should go through the SoC tree.

> 
>  arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi       | 12 ++++++++++++
>  .../arm64/boot/dts/ti/k3-am62x-sk-common.dtsi | 19 +++++++++++++++++++
>  2 files changed, 31 insertions(+)
> 
> diff --git a/arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi b/arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi
> index 80a3e1db26a9..4b55df1da751 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62-mcu.dtsi
> @@ -171,4 +171,16 @@ mcu_mcan1: can@...8000 {
>  		bosch,mram-cfg = <0x0 128 64 64 64 64 32 32>;
>  		status = "disabled";
>  	};
> +
> +	mcu_m4fss: m4fss@...0000 {
> +		compatible = "ti,am64-m4fss";
> +		reg = <0x00 0x5000000 0x00 0x30000>,
> +		<0x00 0x5040000 0x00 0x10000>;
> +		reg-names = "iram", "dram";
> +		ti,sci = <&dmsc>;
> +		ti,sci-dev-id = <9>;
> +		ti,sci-proc-ids = <0x18 0xff>;
> +		resets = <&k3_reset 9 1>;
> +		firmware-name = "am62-mcu-m4f0_0-fw";
> +	};
>  };
> diff --git a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
> index 34c8ffc553ec..ffca61fcf9ba 100644
> --- a/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am62x-sk-common.dtsi
> @@ -47,6 +47,18 @@ ramoops@...00000 {
>  			pmsg-size = <0x8000>;
>  		};
>  
> +		mcu_m4fss_dma_memory_region: m4f-dma-memory@...00000 {
> +			compatible = "shared-dma-pool";
> +			reg = <0x00 0x9cb00000 0x00 0x100000>;
> +			no-map;
> +		};
> +
> +		mcu_m4fss_memory_region: m4f-memory@...00000 {
> +			compatible = "shared-dma-pool";
> +			reg = <0x00 0x9cc00000 0x00 0xe00000>;
> +			no-map;
> +		};
> +
>  		secure_tfa_ddr: tfa@...80000 {
>  			reg = <0x00 0x9e780000 0x00 0x80000>;
>  			alignment = <0x1000>;
> @@ -362,6 +374,13 @@ mbox_m4_0: mbox-m4-0 {
>  	};
>  };
>  
> +&mcu_m4fss {
> +	mboxes = <&mailbox0_cluster0>, <&mbox_m4_0>;
> +	memory-region = <&mcu_m4fss_dma_memory_region>,
> +			<&mcu_m4fss_memory_region>;
> +	sram = <&oc_sram>;
> +};
> +
>  &usbss0 {
>  	status = "okay";
>  	ti,vbus-divider;
> -- 
> 2.34.1
> 

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D