linux-kernel - Re: [PATCH 1/2] soc: qcom: Add device tree binding for Shared Memory Device

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Date:	Fri, 10 Apr 2015 17:41:14 -0700
From:	Bjorn Andersson <bjorn.andersson@...ymobile.com>
To:	unlisted-recipients:; (no To-header on input)
CC:	Rob Herring <robh+dt@...nel.org>, Pawel Moll <pawel.moll@....com>,
	Mark Rutland <mark.rutland@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	"agross@...eaurora.org" <agross@...eaurora.org>,
	<linux-arm-msm@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-soc@...r.kernel.org" <linux-soc@...r.kernel.org>
Subject: Re: [PATCH 1/2] soc: qcom: Add device tree binding for Shared Memory
 Device

Corrected spelling of the msm mailing list...

On Fri 10 Apr 17:16 PDT 2015, Bjorn Andersson wrote:

> Add device tree binding documentation for the Qualcomm Shared Memory
> Device, used for communication between the various CPUs in the Qualcomm
> SoCs.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@...ymobile.com>
> ---
>  .../devicetree/bindings/soc/qcom/qcom,smd.txt      | 78 ++++++++++++++++++++++
>  1 file changed, 78 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt
> 
> diff --git a/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt b/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt
> new file mode 100644
> index 0000000..0fdb7f9d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/soc/qcom/qcom,smd.txt
> @@ -0,0 +1,78 @@
> +Qualcomm Shared Memory Driver (SMD) binding
> +
> +This binding describes the Qualcomm Shared Memory Driver, a fifo based
> +communication channel for sending data between the various subsystems in
> +Qualcomm platforms.
> +
> +- compatible:
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: must be "qcom,smd"
> +
> += EDGES
> +
> +Each subnode of the SMD node represents a remote subsystem or a remote
> +processor of some sort - or in SMD language an "edge". The name of the
> +edges are not important.
> +
> +- interrupts:
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: should specify the IRQ used by the remote processor to
> +		    signal this processor about communication related updates
> +
> +- qcom,ipc:
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: three entries specifying the outgoing ipc bit used for
> +		    signaling the remote processor:
> +		    - phandle to a syscon node representing the apcs registers
> +		    - u32 representing offset to the register within the syscon
> +		    - u32 representing the ipc bit within the register
> +
> +- qcom,smd-edge:
> +	Usage: required
> +	Value type: <u32>
> +	Definition: the identifier representing the remote processor in the
> +		    smd channel allocation table
> +
> += SMD DEVICES
> +
> +In turn, subnodes of the "edges" represent devices tied to SMD channels on that
> +"edge". The names of the devices are not important. The properties of these
> +nodes are defined by the individual bindings for the SMD devices - but must
> +contain the following property:
> +
> +- qcom,smd-channels:
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: a list of channels tied to this device, used for matching
> +		    the device to channels
> +
> += EXAMPLE
> +
> +The following example represents a smd node, with one edge representing the
> +"rpm" subsystem. For the "rpm" subsystem we have a device tied to the
> +"rpm_request" channel.
> +
> +	apcs: syscon@...11000 {
> +		compatible = "syscon";
> +		reg = <0xf9011000 0x1000>;
> +	};
> +
> +        smd {
> +                compatible = "qcom,smd";
> +
> +                rpm {
> +                        interrupts = <0 168 1>;
> +                        qcom,ipc = <&apcs 8 0>;
> +                        qcom,smd-edge = <15>;
> +
> +                        rpm_requests {
> +                                compatible = "qcom,rpm-msm8974";
> +                                qcom,smd-channels = "rpm_requests";
> +
> +				...
> +			};
> +		};
> +	};
> -- 
> 1.8.2.2
> 
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