linux-kernel - Re: [PATCH v3 2/2] dt-bindings: introduce Command DB for QCOM SoCs

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Date:   Mon, 19 Feb 2018 14:31:06 -0600
From:   Rob Herring <robh@...nel.org>
To:     Lina Iyer <ilina@...eaurora.org>
Cc:     andy.gross@...aro.org, david.brown@...aro.org,
        sboyd@...eaurora.org, rnayak@...eaurora.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        bjorn.andersson@...aro.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org,
        Mahesh Sivasubramanian <msivasub@...eaurora.org>
Subject: Re: [PATCH v3 2/2] dt-bindings: introduce Command DB for QCOM SoCs

On Fri, Feb 16, 2018 at 03:46:14PM -0700, Lina Iyer wrote:
> From: Mahesh Sivasubramanian <msivasub@...eaurora.org>
> 
> Command DB provides information on shared resources like clocks,
> regulators etc., probed at boot by the remote subsytem and made
> available in shared memory.
> 
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Mahesh Sivasubramanian <msivasub@...eaurora.org>
> Signed-off-by: Lina Iyer <ilina@...eaurora.org>
> ---
>  .../devicetree/bindings/arm/msm/cmd-db.txt         | 30 ++++++++++++++++++++++
>  1 file changed, 30 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/msm/cmd-db.txt
> 
> diff --git a/Documentation/devicetree/bindings/arm/msm/cmd-db.txt b/Documentation/devicetree/bindings/arm/msm/cmd-db.txt
> new file mode 100644
> index 000000000000..039be54fe9c4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/msm/cmd-db.txt
> @@ -0,0 +1,30 @@
> +Command DB
> +---------
> +
> +Command DB is a database that provides a mapping between resource key and the
> +resource address for a system resource managed by a remote processor. The data
> +is stored in a shared memory region and is loaded by the remote processor.
> +
> +Some of the Qualcomm Technologies Inc SoC's have hardware accelerators for
> +controlling shared resources. Depending on the board configuration the shared
> +resource properties may change. These properties are dynamically probed by the
> +remote processor and made available in the shared memory.
> +
> +The devicetree representation of the command DB driver should be:

Need to state this is a child of /reserved-memory

> +
> +PROPERTIES:

Why the yelling? :)

> +- compatible:
> +	Usage: required
> +	Value type: <string>
> +	Definition: Should be "qcom,cmd-db"

reg?

> +
> +Example:
> +
> +	reserved-memory {
> +		[...]
> +		qcom,cmd-db@...000c {
> +			reg = <0x0 0xc3f000c 0x0 0x8>,
> +			      <0x0 0x85fe0000 0x0 0x20000>;
> +			compatible = "qcom,cmd-db";
> +		};
> +	};
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
> 
> --
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