linux-kernel - Re: [PATCH v4 5/6] dt-bindings: Add support for tegra186-bpmp DRAM MRQ GSCs

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Date:   Fri, 12 May 2023 08:45:22 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Peter De Schrijver <pdeschrijver@...dia.com>,
        thierry.reding@...il.com, jonathanh@...dia.com
Cc:     robh+dt@...nel.org, krzysztof.kozlowski+dt@...aro.org,
        conor+dt@...nel.org, devicetree@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org,
        stefank@...dia.com
Subject: Re: [PATCH v4 5/6] dt-bindings: Add support for tegra186-bpmp DRAM
 MRQ GSCs

On 11/05/2023 15:20, Peter De Schrijver wrote:
> Add memory-region property to the tegra186-bpmp binding to support
> DRAM MRQ GSCs.

Use subject prefixes matching the subsystem (which you can get for
example with `git log --oneline -- DIRECTORY_OR_FILE` on the directory
your patch is touching).

> 
> Co-developed-by: Stefan Kristiansson <stefank@...dia.com>
> Signed-off-by: Stefan Kristiansson <stefank@...dia.com>
> Signed-off-by: Peter De Schrijver <pdeschrijver@...dia.com>
> ---
>  .../firmware/nvidia,tegra186-bpmp.yaml        | 37 +++++++++++++++++--
>  1 file changed, 34 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/firmware/nvidia,tegra186-bpmp.yaml b/Documentation/devicetree/bindings/firmware/nvidia,tegra186-bpmp.yaml
> index 833c07f1685c..f3e02c9d090d 100644
> --- a/Documentation/devicetree/bindings/firmware/nvidia,tegra186-bpmp.yaml
> +++ b/Documentation/devicetree/bindings/firmware/nvidia,tegra186-bpmp.yaml
> @@ -57,8 +57,11 @@ description: |
>    "#address-cells" or "#size-cells" property.
>  
>    The shared memory area for the IPC TX and RX between CPU and BPMP are
> -  predefined and work on top of sysram, which is an SRAM inside the
> -  chip. See ".../sram/sram.yaml" for the bindings.
> +  predefined and work on top of either sysram, which is an SRAM inside the
> +  chip, or in normal SDRAM.
> +  See ".../sram/sram.yaml" for the bindings for the SRAM case.
> +  See "../reserved-memory/nvidia,tegra264-bpmp-shmem.yaml" for bindings for
> +  the SDRAM case.
>  
>  properties:
>    compatible:
> @@ -81,6 +84,11 @@ properties:
>      minItems: 2
>      maxItems: 2
>  
> +  memory-region:
> +    description: phandle to reserved memory region used for IPC between
> +      CPU-NS and BPMP.
> +    maxItems: 1
> +
>    "#clock-cells":
>      const: 1
>  
> @@ -115,10 +123,15 @@ properties:
>  
>  additionalProperties: false
>  
> +oneOf:
> +  - required:
> +      - memory-region
> +  - required:
> +      - shmem
> +
>  required:
>    - compatible
>    - mboxes
> -  - shmem
>    - "#clock-cells"
>    - "#power-domain-cells"
>    - "#reset-cells"
> @@ -184,3 +197,21 @@ examples:
>              #thermal-sensor-cells = <1>;
>          };
>      };
> +
> +  - |
> +    #include <dt-bindings/mailbox/tegra186-hsp.h>
> +
> +    bpmp {
> +        compatible = "nvidia,tegra186-bpmp";
> +        interconnects = <&mc TEGRA186_MEMORY_CLIENT_BPMPR &emc>,
> +                        <&mc TEGRA186_MEMORY_CLIENT_BPMPW &emc>,
> +                        <&mc TEGRA186_MEMORY_CLIENT_BPMPDMAR &emc>,
> +                        <&mc TEGRA186_MEMORY_CLIENT_BPMPDMAW &emc>;
> +        interconnect-names = "read", "write", "dma-mem", "dma-write";
> +        mboxes = <&hsp_top1 TEGRA_HSP_MBOX_TYPE_DB
> +                            TEGRA_HSP_DB_MASTER_BPMP>;
> +        memory-region = <&dram_cpu_bpmp_mail>;

I am not sure if difference with one property justifies new example...

Best regards,
Krzysztof