linux-kernel - Re: [RFC v2 1/7] devicetree: bindings: Document domains controller bindings

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Date:   Mon, 18 Feb 2019 17:04:02 +0100
From:   Benjamin Gaignard <benjamin.gaignard@...aro.org>
To:     Benjamin Gaignard <benjamin.gaignard@...com>
Cc:     Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Shawn Guo <shawnguo@...nel.org>,
        s.hauer@...gutronix.de, Fabio Estevam <fabio.estevam@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Loic PALLARDY <loic.pallardy@...com>, kernel@...gutronix.de,
        linux-imx@....com, Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC v2 1/7] devicetree: bindings: Document domains controller bindings

Le lun. 28 janv. 2019 à 15:23, Benjamin Gaignard
<benjamin.gaignard@...com> a écrit :
>
> Document commons domains controller bindings for controller
> and client devices.

Gentle ping to get comments on those bindings,

Thanks,
Benjamin
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>
> ---
> version 2:
> - complete rework of bindings description to try to give a better definition
>   of what bus domains could be.
>  .../bindings/bus/domains/domainsctrl.txt           | 55 ++++++++++++++++++++++
>  1 file changed, 55 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/bus/domains/domainsctrl.txt
>
> diff --git a/Documentation/devicetree/bindings/bus/domains/domainsctrl.txt b/Documentation/devicetree/bindings/bus/domains/domainsctrl.txt
> new file mode 100644
> index 000000000000..a3fced91842d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/bus/domains/domainsctrl.txt
> @@ -0,0 +1,55 @@
> +Common Domains Controller bindings properties
> +
> +Bus domains controllers allow to divided system on chip into multiple domains
> +that can be used to select by who hardware blocks could be accessed.
> +A domain could be a cluster of CPUs (or coprocessors), a range of addresses or
> +a group of hardware blocks.
> +
> +This device tree bindings can be used to bind bus domain consumer devices with
> +their bus domains provided by bus domains controllers. A bus domain provider
> +can be represented by any node in the device tree and can provide one or more
> +bus domains. A consumer node can refer to the provider by a phandle and a set
> +of phandle arguments of length specified by the #domainctrl-cells property in
> +the bus domain provider node.
> +
> +==Bus domain provider==
> +
> +Required properties:
> +- #domainctrl-cells    : Number of cells in a bus domain specifier;
> +                         Can be any value as specified by device tree binding
> +                         documentation of a particular provider.
> +
> +==Bus domain consumer==
> +
> +Required properties:
> +- domainsctrl-X                : A list of bus domain specifiers, as defined by
> +                         bindings of the bus domain controller that is the
> +                         bus domain provider.
> +
> +Optional properties:
> +- domainsctrl-names    : A list of bus domain name string sorted in the same
> +                         order as the domainsctrl-X proprerties. Consumer
> +                         drivers will use domainsctrl-names to match bus
> +                         domains with bus domains specifiers.
> +                         Note that "default" and "unbind" are reserved names
> +                         used by the framework.
> +
> +Example of usage with:
> +- a domains controller with a 2 parameters cell
> +- a domains controller with a 3 parameters cell
> +- a client device node using the both controllers and 2 configurations
> +  named "default" and "unbind"
> +
> +ctrl0: ctrl@0 {
> +       #domainctrl-cells = <2>;
> +};
> +
> +ctrl1: ctrl@1 {
> +       #domainctrl-cells = <3>;
> +};
> +
> +foo@0 {
> +       domains-names = "default", "unbind";
> +       domainctrl-0 = <&ctrl0 1 2>, <&ctrl1 3 4 5>;
> +       domainctrl-1 = <&ctrl0 6 7>, <&ctrl1 8 9 0>;
> +};
> --
> 2.15.0
>


-- 
Benjamin Gaignard

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