linux-kernel - Re: [PATCH v6 7/8] dt-bindings: Introduce interconnect consumers bindings

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Date:   Tue, 10 Jul 2018 15:34:51 -0700
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, Alexandre Bailon <abailon@...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, mka@...omium.org, mark.rutland@....com,
        lorenzo.pieralisi@....com, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-arm-msm@...r.kernel.org, tfiga@...omium.org
Subject: Re: [PATCH v6 7/8] dt-bindings: Introduce interconnect consumers bindings

On Mon, Jul 9, 2018 at 8:51 AM Georgi Djakov <georgi.djakov@...aro.org> wrote:
>
> Add documentation for the interconnect consumer bindings, that will allow
> to link a device node (consumer) to its interconnect controller hardware.
>
> Tha aim is to enable drivers to request a framework API to configure an
> interconnect path by providing their struct device pointer and a name.
>
> Signed-off-by: Georgi Djakov <georgi.djakov@...aro.org>
> ---
>  .../bindings/interconnect/interconnect.txt    | 27 +++++++++++++++++++
>  1 file changed, 27 insertions(+)
>
> diff --git a/Documentation/devicetree/bindings/interconnect/interconnect.txt b/Documentation/devicetree/bindings/interconnect/interconnect.txt
> index 6e2b2971b094..0ad65dccbe8b 100644
> --- a/Documentation/devicetree/bindings/interconnect/interconnect.txt
> +++ b/Documentation/devicetree/bindings/interconnect/interconnect.txt
> @@ -31,3 +31,30 @@ Example:
>                         clocks = <&rpmcc RPM_SMD_SNOC_CLK>,
>                                  <&rpmcc RPM_SMD_SNOC_A_CLK>;
>                 };
> +
> +
> += interconnect consumers =
> +
> +The interconnect consumers are device nodes which consume the interconnect
> +path(s) provided by the interconnect provider. There can be multiple

I wonder if this sentence could be more descriptive. Maybe something like:

The interconnect consumers are device nodes which dynamically express
their bandwidth requirements along interconnect paths they are
connected to.

...or choose a better one if this one's a mouthful.

> +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
> +                    specifiers.
> +
> +Example:
> +
> +       sdhci@...4000 {
> +               ...
> +               interconnects = <&pnoc MASTER_SDCC_1 &bimc SLAVE_EBI_CH0>;
> +               interconnect-names = "ddr";
> +       };