linux-kernel - Re: [PATCH v4 2/2] dt-bindings: introduce Command DB for QCOM SoCs

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Message-ID: <152029567344.218381.8756848686590091138@swboyd.mtv.corp.google.com>
Date:   Mon, 05 Mar 2018 16:21:13 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Lina Iyer <ilina@...eaurora.org>, andy.gross@...aro.org,
        david.brown@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org
Cc:     rnayak@...eaurora.org, bjorn.andersson@...aro.org,
        linux-kernel@...r.kernel.org, Lina Iyer <ilina@...eaurora.org>,
        devicetree@...r.kernel.org,
        Mahesh Sivasubramanian <msivasub@...eaurora.org>
Subject: Re: [PATCH v4 2/2] dt-bindings: introduce Command DB for QCOM SoCs

Quoting Lina Iyer (2018-02-26 09:58:02)
> 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..5737ed2ac6e8
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/msm/cmd-db.txt
> @@ -0,0 +1,38 @@
> +Command DB
> +---------
> +
> +Command DB is a database that provides a mapping between resource key and the

s/between/between 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

s/SoC's/SoCs/

> +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 bindings for Command DB is specified in the reserved-memory section in

s/bindings/node/

maybe?

> +devicetree. The devicetree representation of the command DB driver should be:

Maybe drop this last sentence entirely.

> +
> +Properties:
> +- compatible:
> +       Usage: required
> +       Value type: <string>
> +       Definition: Should be "qcom,cmd-db"
> +
> +- reg:
> +       Usage: required
> +       Value type: <prop encoded array>
> +       Definition: The register address that points to the location of the
> +                   Command DB in memory. Additionally, specify the address
> +                   and size of the actual lacation in memory.

s/lacation/location/

> +
> +Example:
> +
> +       reserved-memory {
> +               [...]
> +               qcom,cmd-db@...000c {
> +                       reg = <0x0 0xc3f000c 0x0 0x8>,
> +                             <0x0 0x85fe0000 0x0 0x20000>;
> +                       compatible = "qcom,cmd-db";
> +               };
> +       };