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Date:   Mon, 26 Nov 2018 11:02:48 -0800 (PST)
Subject:     Re: [PATCH] dt-bindings: sifive: describe sifive-blocks versioning
In-Reply-To: <alpine.DEB.2.21.9999.1811211704520.16271@viisi.sifive.com>
CC:     robh+dt@kernel.org, devicetree@vger.kernel.org,
        Megan Wachs <megan@sifive.com>,
        Wesley Terpstra <wesley@sifive.com>, mark.rutland@arm.com,
        devicetree@vger.kernel.org, linux-riscv@lists.infradead.org,
        linux-kernel@vger.kernel.org, paul@pwsan.com
From:   Palmer Dabbelt <palmer@sifive.com>
To:     Paul Walmsley <paul.walmsley@sifive.com>
Message-ID: <mhng-197c28a9-6763-40df-988b-3494dfe124d4@palmer-si-x1c4>
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On Wed, 21 Nov 2018 17:06:56 PST (-0800), Paul Walmsley wrote:
>
> For IP blocks that are generated from the public, open-source
> sifive-blocks repository, describe the version numbering policy
> that its maintainers intend to use, upon request from Rob
> Herring <robh@kernel.org>.
>
> Cc: Rob Herring <robh+dt@kernel.org>
> Cc: Palmer Dabbelt <palmer@sifive.com>
> Cc: Megan Wachs <megan@sifive.com>
> Cc: Wesley Terpstra <wesley@sifive.com>
> Cc: Mark Rutland <mark.rutland@arm.com>
> Cc: devicetree@vger.kernel.org
> Cc: linux-riscv@lists.infradead.org
> Cc: linux-kernel@vger.kernel.org
> Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
> Signed-off-by: Paul Walmsley <paul@pwsan.com>
> ---
>
> Hi Rob, please let me know if this document works with your
> requirements, or if some changes are needed.  - Paul
>
>  .../sifive/sifive-blocks-ip-versioning.txt    | 38 +++++++++++++++++++
>  1 file changed, 38 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/sifive/sifive-blocks-ip-versioning.txt
>
> diff --git a/Documentation/devicetree/bindings/sifive/sifive-blocks-ip-versioning.txt b/Documentation/devicetree/bindings/sifive/sifive-blocks-ip-versioning.txt
> new file mode 100644
> index 000000000000..b899e5c6e00c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/sifive/sifive-blocks-ip-versioning.txt
> @@ -0,0 +1,38 @@
> +DT compatible string versioning for SiFive open-source IP blocks
> +
> +This document describes the version specification for DT "compatible"
> +strings for open-source SiFive IP blocks.  HDL for these IP blocks
> +can be found in this public repository:
> +
> +https://github.com/sifive/sifive-blocks
> +
> +IP block-specific DT compatible strings are contained within the HDL,
> +in the form "sifive,<ip-block-name><integer version number>".
> +
> +An example is "sifive,uart0" from:
> +
> +https://github.com/sifive/sifive-blocks/blob/master/src/main/scala/devices/uart/UART.scala#L43
> +
> +Until these IP blocks (or IP integration) support version
> +autodiscovery, the maintainers of these IP blocks intend to increment
> +the suffixed number in the compatible string whenever the software
> +interface to these IP blocks changes, or when the functionality of the
> +underlying IP blocks changes in a way that software should be aware of.
> +
> +Driver developers can use compatible string "match" values such as
> +"sifive,uart0" to indicate that their driver is compatible with the
> +register interface and functionality associated with the relevant
> +upstream sifive-blocks commits.  It is expected that most drivers will
> +match on these IP block-specific compatible strings.
> +
> +DT data authors, when writing data for a particular SoC, should
> +continue to specify an SoC-specific compatible string value, such as
> +"sifive,fu540-c000-uart".  This way, if SoC-specific
> +integration-specific bug fixes or workarounds are needed, the kernel
> +or other system software can match on this string to apply them.  The
> +IP block-specific compatible string (such as "sifive,uart0") should
> +then be specified as a subsequent value.
> +
> +An example of this style:
> +
> +    compatible = "sifive,fu540-c000-uart", "sifive,uart0";

Reviewed-by: Palmer Dabbelt <palmer@sifive.com>