linux-kernel - Re: [PATCH v4 7/9] arm64: dts : ti: k3-am68-sk-som: Add DDR carveout memory nodes for C71x DSP

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Date:   Wed, 27 Sep 2023 20:52:01 +0530
From:   "Kumar, Udit" <u-kumar1@...com>
To:     Apurva Nandan <a-nandan@...com>, Nishanth Menon <nm@...com>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tero Kristo <kristo@...nel.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley <conor+dt@...nel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Hari Nagalla <hnagalla@...com>
Subject: Re: [PATCH v4 7/9] arm64: dts : ti: k3-am68-sk-som: Add DDR carveout
 memory nodes for C71x DSP


On 9/6/2023 4:54 PM, Apurva Nandan wrote:
> Two carveout reserved memory nodes each have been added for each of the
> C71x DSP for the TI K3 AM68 SK boards. These nodes are assigned to the
> respective rproc device nodes as well. The first region will be used as
> the 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
> device. The C71x DSP processor supports a MMU called CMMU, but is not
> currently supported and as such requires the exact memory used by the
> firmware to be set-aside.
>
> Signed-off-by: Sinthu Raja <sinthu.raja@...com>
> Signed-off-by: Apurva Nandan <a-nandan@...com>
> ---
>   arch/arm64/boot/dts/ti/k3-am68-sk-som.dtsi | 52 ++++++++++++++++++++++
>   1 file changed, 52 insertions(+)
>
> diff --git a/arch/arm64/boot/dts/ti/k3-am68-sk-som.dtsi b/arch/arm64/boot/dts/ti/k3-am68-sk-som.dtsi
> index beab405274ab..20861a0a46b0 100644
> --- a/arch/arm64/boot/dts/ti/k3-am68-sk-som.dtsi
> +++ b/arch/arm64/boot/dts/ti/k3-am68-sk-som.dtsi
> @@ -98,6 +98,30 @@ main_r5fss1_core1_memory_region: r5f-memory@...00000 {
>   			no-map;
>   		};


Reviewed by: Udit Kumar<u-kumar1@...com>

> [...]