[PATCH 1/2] dt-bindings: riscv: sifive-l2: add a PolarFire SoC compatible
Heinrich Schuchardt
heinrich.schuchardt at canonical.com
Thu Aug 25 11:36:49 PDT 2022
On 8/25/22 20:04, Conor Dooley wrote:
> From: Conor Dooley <conor.dooley at microchip.com>
>
> The l2 cache on PolarFire SoC is cross between that of the fu540 and
> the fu740. It has the extra interrupt from the fu740 but the lower
> number of cache-sets. Add a specific compatible to avoid the likes
> of:
>
> mpfs-polarberry.dtb: cache-controller at 2010000: interrupts: [[1], [3], [4], [2]] is too long
Where is such a message written? I couldn't find the string in
next-20220825 (git grep -n 'is too long"').
Why should a different number of cache sets require an extra compatible
string. cache-size is simply a parameter going with the existing
compatible strings.
I would assume that you only need an extra compatible string if there is
a functional difference that can not be expressed with the existing
parameters.
>
> Fixes: 34fc9cc3aebe ("riscv: dts: microchip: correct L2 cache interrupts")
> Signed-off-by: Conor Dooley <conor.dooley at microchip.com>
> ---
> .../bindings/riscv/sifive-l2-cache.yaml | 79 ++++++++++++-------
> 1 file changed, 49 insertions(+), 30 deletions(-)
>
> diff --git a/Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml b/Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml
> index 69cdab18d629..ca3b9be58058 100644
> --- a/Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml
> +++ b/Documentation/devicetree/bindings/riscv/sifive-l2-cache.yaml
> @@ -17,9 +17,6 @@ description:
> acts as directory-based coherency manager.
> All the properties in ePAPR/DeviceTree specification applies for this platform.
>
> -allOf:
> - - $ref: /schemas/cache-controller.yaml#
> -
> select:
> properties:
> compatible:
> @@ -33,11 +30,16 @@ select:
>
> properties:
> compatible:
> - items:
> - - enum:
> - - sifive,fu540-c000-ccache
> - - sifive,fu740-c000-ccache
Why can't you simply add microchip,mpfs-ccache here?
> - - const: cache
> + oneOf:
> + - items:
> + - enum:
> + - sifive,fu540-c000-ccache
> + - sifive,fu740-c000-ccache
> + - const: cache
> + - items:
> + - const: microchip,mpfs-ccache
> + - const: sifive,fu540-c000-ccache
Why do we need 'sifive,fu540-c000-ccache' twice?
Best regards
Heinrich
> + - const: cache
>
> cache-block-size:
> const: 64
> @@ -72,29 +74,46 @@ properties:
> The reference to the reserved-memory for the L2 Loosely Integrated Memory region.
> The reserved memory node should be defined as per the bindings in reserved-memory.txt.
>
> -if:
> - properties:
> - compatible:
> - contains:
> - const: sifive,fu540-c000-ccache
> +allOf:
> + - $ref: /schemas/cache-controller.yaml#
>
> -then:
> - properties:
> - interrupts:
> - description: |
> - Must contain entries for DirError, DataError and DataFail signals.
> - maxItems: 3
> - cache-sets:
> - const: 1024
> -
> -else:
> - properties:
> - interrupts:
> - description: |
> - Must contain entries for DirError, DataError, DataFail, DirFail signals.
> - minItems: 4
> - cache-sets:
> - const: 2048
> + - if:
> + properties:
> + compatible:
> + contains:
> + enum:
> + - sifive,fu740-c000-ccache
> + - microchip,mpfs-ccache
> +
> + then:
> + properties:
> + interrupts:
> + description: |
> + Must contain entries for DirError, DataError, DataFail, DirFail signals.
> + minItems: 4
> +
> + else:
> + properties:
> + interrupts:
> + description: |
> + Must contain entries for DirError, DataError and DataFail signals.
> + maxItems: 3
> +
> + - if:
> + properties:
> + compatible:
> + contains:
> + const: sifive,fu740-c000-ccache
> +
> + then:
> + properties:
> + cache-sets:
> + const: 2048
> +
> + else:
> + properties:
> + cache-sets:
> + const: 1024
>
> additionalProperties: false
>
More information about the linux-riscv
mailing list