linux-kernel - Re: [PATCH V3 1/2] dt-bindings: mtd: partitions: u-boot: allow dynamic subpartitions

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Message-ID: <Y07LYoq6Dh+k0uJm@spud>
Date:   Tue, 18 Oct 2022 16:50:58 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Rafał Miłecki <zajec5@...il.com>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Tom Rini <trini@...sulko.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Joel Peshkin <joel.peshkin@...adcom.com>,
        William Zhang <william.zhang@...adcom.com>,
        Conor Dooley <conor.dooley@...rochip.com>,
        devicetree@...r.kernel.org, linux-mtd@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, u-boot@...ts.denx.de,
        bcm-kernel-feedback-list@...adcom.com,
        linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH V3 1/2] dt-bindings: mtd: partitions: u-boot: allow
 dynamic subpartitions

On Tue, Oct 18, 2022 at 05:42:01PM +0200, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@...ecki.pl>
> 
> U-Boot partition may contain subpartitions. For example Broadcom
> includes environment data block in the middle of its U-Boot partition.
> 
> This allows describing Broadcom's U-Boot env data and will allow
> referencing its NVMEM cell in the future.
> 
> Reg: 118f3fbe517f4 ("dt-bindings: mtd: partitions: support label/name only partition")

Pardon my ignorance here, but what is the significance of a "Reg" tag?
Thanks,
Conor.

> Ref: dd638202dfb65 ("dt-bindings: mtd: partitions: add additional example for qcom,smem-part")
> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
> ---
> V3: Add this patch as pre-requirement for u-boot,env.yaml & brcm,env
> ---
>  .../devicetree/bindings/mtd/partitions/u-boot.yaml         | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/mtd/partitions/u-boot.yaml b/Documentation/devicetree/bindings/mtd/partitions/u-boot.yaml
> index 8a88e7d16524..3c56efe48efd 100644
> --- a/Documentation/devicetree/bindings/mtd/partitions/u-boot.yaml
> +++ b/Documentation/devicetree/bindings/mtd/partitions/u-boot.yaml
> @@ -27,6 +27,10 @@ properties:
>            Broadcom stores environment variables inside a U-Boot partition. They
>            can be identified by a custom header with magic value.
>  
> +patternProperties:
> +  "^partition-.*$":
> +    $ref: partition.yaml#
> +
>  unevaluatedProperties: false
>  
>  examples:
> @@ -40,6 +44,9 @@ examples:
>              compatible = "brcm,u-boot";
>              reg = <0x0 0x100000>;
>              label = "u-boot";
> +
> +            partition-u-boot-env {
> +            };
>          };
>  
>          partition@...000 {
> -- 
> 2.34.1
>