linux-kernel - Re: [PATCH 01/12] dt-bindings: riscv: sifive-ccache: Add compatible for StarFive JH7100 SoC

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Message-ID: <Y+vxw28NWPfaW7ql@spud>
Date:   Tue, 14 Feb 2023 20:40:35 +0000
From:   Conor Dooley <conor@...nel.org>
To:     Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
Cc:     Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Emil Renner Berthing <kernel@...il.dk>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Richard Cochran <richardcochran@...il.com>,
        Sagar Kadam <sagar.kadam@...ive.com>,
        Yanhong Wang <yanhong.wang@...rfivetech.com>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, linux-riscv@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, kernel@...labora.com
Subject: Re: [PATCH 01/12] dt-bindings: riscv: sifive-ccache: Add compatible
 for StarFive JH7100 SoC

Hey all,

On Sat, Feb 11, 2023 at 05:18:10AM +0200, Cristian Ciocaltea wrote:
> Document the compatible for the SiFive Composable Cache Controller found
> on the StarFive JH7100 SoC.
> 
> This also requires extending the 'reg' property to handle distinct
> ranges, as specified via 'reg-names'.
> 
> Signed-off-by: Cristian Ciocaltea <cristian.ciocaltea@...labora.com>
> ---
>  .../bindings/riscv/sifive,ccache0.yaml        | 28 ++++++++++++++++++-
>  1 file changed, 27 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/devicetree/bindings/riscv/sifive,ccache0.yaml b/Documentation/devicetree/bindings/riscv/sifive,ccache0.yaml
> index 31d20efaa6d3..2b864b2f12c9 100644
> --- a/Documentation/devicetree/bindings/riscv/sifive,ccache0.yaml
> +++ b/Documentation/devicetree/bindings/riscv/sifive,ccache0.yaml
> @@ -25,6 +25,7 @@ select:
>            - sifive,ccache0
>            - sifive,fu540-c000-ccache
>            - sifive,fu740-c000-ccache
> +          - starfive,jh7100-ccache
>  
>    required:
>      - compatible
> @@ -37,6 +38,7 @@ properties:
>                - sifive,ccache0
>                - sifive,fu540-c000-ccache
>                - sifive,fu740-c000-ccache
> +              - starfive,jh7100-ccache
>            - const: cache
>        - items:
>            - const: starfive,jh7110-ccache
> @@ -70,7 +72,13 @@ properties:
>        - description: DirFail interrupt
>  
>    reg:
> -    maxItems: 1
> +    minItems: 1
> +    maxItems: 2
> +
> +  reg-names:
> +    items:
> +      - const: control
> +      - const: sideband

So why is this called "sideband"?
In the docs for the JH7100 it is called LIM & it's called LIM in our
docs for the PolarFire SoC (at the same address btw) and we run the HSS
out of it! LIM being "loosely integrated memory", which by the limit
hits on Google may be a SiFive-ism?

I'm not really sure if adding it as a "reg" section is the right thing
to do as it's not "just" a register bank.
Perhaps Rob/Krzysztof have a take on that one?

>  
>    next-level-cache: true
>  
> @@ -89,6 +97,7 @@ allOf:
>            contains:
>              enum:
>                - sifive,fu740-c000-ccache
> +              - starfive,jh7100-ccache
>                - starfive,jh7110-ccache
>                - microchip,mpfs-ccache
>  
> @@ -106,12 +115,29 @@ allOf:
>              Must contain entries for DirError, DataError and DataFail signals.
>            maxItems: 3
>  
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            const: starfive,jh7100-ccache
> +
> +    then:
> +      properties:
> +        reg:
> +          maxItems: 2
> +
> +    else:
> +      properties:
> +        reg:
> +          maxItems: 1
> +
>    - if:
>        properties:
>          compatible:
>            contains:
>              enum:
>                - sifive,fu740-c000-ccache
> +              - starfive,jh7100-ccache
>                - starfive,jh7110-ccache
>  
>      then:
> -- 
> 2.39.1
> 

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