linux-kernel - Re: [PATCH v10 2/7] dt-bindings: Introduce interconnect binding

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Message-ID: <CAE=gft5z0=Rp_+jj2JTKF4Kn-RB6AK0Ke1ByUuRwrZHwvNDcCg@mail.gmail.com>
Date:   Fri, 30 Nov 2018 16:38:31 -0800
From:   Evan Green <evgreen@...omium.org>
To:     georgi.djakov@...aro.org
Cc:     linux-pm@...r.kernel.org, gregkh@...uxfoundation.org,
        rjw@...ysocki.net, robh+dt@...nel.org,
        Michael Turquette <mturquette@...libre.com>,
        khilman@...libre.com, Vincent Guittot <vincent.guittot@...aro.org>,
        Saravana Kannan <skannan@...eaurora.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        amit.kucheria@...aro.org, seansw@....qualcomm.com,
        daidavid1@...eaurora.org, mark.rutland@....com,
        lorenzo.pieralisi@....com, Alexandre Bailon <abailon@...libre.com>,
        maxime.ripard@...tlin.com, Arnd Bergmann <arnd@...db.de>,
        thierry.reding@...il.com, ksitaraman@...dia.com,
        sanjayc@...dia.com, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH v10 2/7] dt-bindings: Introduce interconnect binding

On Tue, Nov 27, 2018 at 10:03 AM Georgi Djakov <georgi.djakov@...aro.org> wrote:
>
> This binding is intended to represent the relations between the interconnect
> controllers (providers) and consumer device nodes. It will allow creating links
> between consumers and interconnect paths (exposed by interconnect providers).
>
> Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
> ---
>  .../bindings/interconnect/interconnect.txt    | 60 +++++++++++++++++++
>  1 file changed, 60 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interconnect/interconnect.txt
>
> diff --git a/Documentation/devicetree/bindings/interconnect/interconnect.txt b/Documentation/devicetree/bindings/interconnect/interconnect.txt
> new file mode 100644
> index 000000000000..6775c07e1574
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interconnect/interconnect.txt
> @@ -0,0 +1,60 @@
> +Interconnect Provider Device Tree Bindings
> +=========================================
> +
> +The purpose of this document is to define a common set of generic interconnect
> +providers/consumers properties.
> +
> +
> += interconnect providers =
> +
> +The interconnect provider binding is intended to represent the interconnect
> +controllers in the system. Each provider registers a set of interconnect
> +nodes, which expose the interconnect related capabilities of the interconnect
> +to consumer drivers. These capabilities can be throughput, latency, priority
> +etc. The consumer drivers set constraints on interconnect path (or endpoints)
> +depending on the use case. Interconnect providers can also be interconnect
> +consumers, such as in the case where two network-on-chip fabrics interface
> +directly.
> +
> +Required properties:
> +- compatible : contains the interconnect provider compatible string
> +- #interconnect-cells : number of cells in a interconnect specifier needed to
> +                       encode the interconnect node id
> +
> +Example:
> +
> +               snoc: interconnect@...000 {
> +                       compatible = "qcom,msm8916-snoc";
> +                       #interconnect-cells = <1>;
> +                       reg = <0x580000 0x14000>;
> +                       clock-names = "bus_clk", "bus_a_clk";
> +                       clocks = <&rpmcc RPM_SMD_SNOC_CLK>,
> +                                <&rpmcc RPM_SMD_SNOC_A_CLK>;
> +               };
> +
> +
> += interconnect consumers =
> +
> +The interconnect consumers are device nodes which dynamically express their
> +bandwidth requirements along interconnect paths they are connected to. There
> +can be multiple interconnect providers on a SoC and the consumer may consume
> +multiple paths from different providers depending on use case and the
> +components it has to interact with.
> +
> +Required properties:
> +interconnects : Pairs of phandles and interconnect provider specifier to denote
> +               the edge source and destination ports of the interconnect path.
> +
> +Optional properties:
> +interconnect-names : List of interconnect path name strings sorted in the same
> +                    order as the interconnects property. Consumers drivers will use
> +                    interconnect-names to match interconnect paths with interconnect
> +                    specifier pairs.
> +
> +Example:
> +
> +       sdhci@...4000 {
> +               ...
> +               interconnects = <&pnoc MASTER_SDCC_1 &bimc SLAVE_EBI_CH0>;
> +               interconnect-names = "sdhc-ddr";
> +       };

Reviewed-by: Evan Green <evgreen@...omium.org>