linux-kernel - Re: [RESEND PATCH 1/7] devicetree: bindings: Document domains controller bindings

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Date:   Mon, 29 Apr 2019 08:49:39 +0000
From:   Benjamin GAIGNARD <benjamin.gaignard@...com>
To:     "broonie@...nel.org" <broonie@...nel.org>,
        "robh@...nel.org" <robh@...nel.org>,
        "arnd@...db.de" <arnd@...db.de>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "fabio.estevam@....com" <fabio.estevam@....com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Loic PALLARDY" <loic.pallardy@...com>,
        "benjamin.gaignard@...aro.org" <benjamin.gaignard@...aro.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linux-imx@....com" <linux-imx@....com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
Subject: Re: [RESEND PATCH 1/7] devicetree: bindings: Document domains
 controller bindings


On 3/18/19 11:05 AM, Benjamin Gaignard wrote:
> Document commons domains controller bindings for controller
> and client devices.
>
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>

Hi Rob,

In the first version of this series you have asked me to rework the 
framework description.
Does this v2 feel better for you ?

Benjamin

> ---
>   .../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..f82e5e11ea64
> --- /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>;
> +};