Subject: Re: [PATCH] dt-bindings: mark unimplemented AXI snps,kbbe snps,mb and snps,rb

From: "Russell King (Oracle)" <[email-masked]>
Date: Sat, 7 Mar 2026 00:05:18 +0000

Any chance of a review from the DT maintainers please?

Thanks.

On Wed, Mar 04, 2026 at 05:30:32PM +0000, Russell King (Oracle) wrote:
> Mark the AXI snps,kbbe snps,mb and snps,rb properties as not
> implemented. These were introduced by commit afea03656add ("stmmac:
> rework DMA bus setting and introduce new platform AXI structure").
> While stmmac has code to parse these properties and save their values,
> these are written to write-only struct members - no code in stmmac
> has ever read their value. Hence, these properties have been non-
> functional from day one.
> 
> Signed-off-by: Russell King (Oracle) <[email-masked]>
> ---
>  Documentation/devicetree/bindings/net/snps,dwmac.yaml | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/net/snps,dwmac.yaml b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> index 38bc34dc4f09..45dba6533458 100644
> --- a/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> +++ b/Documentation/devicetree/bindings/net/snps,dwmac.yaml
> @@ -202,11 +202,11 @@ title: Synopsys DesignWare MAC
>          * snps,xit_frm, unlock on WoL
>          * snps,wr_osr_lmt, max write outstanding req. limit
>          * snps,rd_osr_lmt, max read outstanding req. limit
> -        * snps,kbbe, do not cross 1KiB boundary.
> +        * snps,kbbe, do not cross 1KiB boundary (not implemented)
>          * snps,blen, this is a vector of supported burst length.
>          * snps,fb, fixed-burst
> -        * snps,mb, mixed-burst
> -        * snps,rb, rebuild INCRx Burst
> +        * snps,mb, mixed-burst (not implemented)
> +        * snps,rb, rebuild INCRx Burst (not implemented)
>  
>    snps,mtl-rx-config:
>      $ref: /schemas/types.yaml#/definitions/phandle
> -- 
> 2.47.3
> 
> 

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