linux-kernel - Re: [PATCH 1/2] slimbus: ngd: dt-bindings: Add slim ngd dt bindings

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Date:   Wed, 23 May 2018 11:40:23 -0500
From:   Rob Herring <robh@...nel.org>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Cc:     gregkh@...uxfoundation.org, kramasub@...eaurora.org,
        sdharia@...cinc.com, girishm@...cinc.com,
        linux-kernel@...r.kernel.org, mark.rutland@....com,
        bgoswami@...eaurora.org, devicetree@...r.kernel.org,
        broonie@...nel.org, linux-arm-msm@...r.kernel.org,
        alsa-devel@...a-project.org
Subject: Re: [PATCH 1/2] slimbus: ngd: dt-bindings: Add slim ngd dt bindings

On Wed, May 16, 2018 at 05:51:17PM +0100, Srinivas Kandagatla wrote:
> This patch adds bindings for Qualcomm SLIMBus NGD controller found in
> all new SoCs starting from B family.
> SLIMBus NGD controller is a light-weight driver responsible for
> communicating with SLIMBus slaves directly over the bus using messaging
> interface and communicating with master component residing on ADSP for
> bandwidth and data-channel management
> 
> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
> ---
>  .../bindings/slimbus/slim-ngd-qcom-ctrl.txt        | 70 ++++++++++++++++++++++
>  1 file changed, 70 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/slimbus/slim-ngd-qcom-ctrl.txt
> 
> diff --git a/Documentation/devicetree/bindings/slimbus/slim-ngd-qcom-ctrl.txt b/Documentation/devicetree/bindings/slimbus/slim-ngd-qcom-ctrl.txt
> new file mode 100644
> index 000000000000..c948fb098819
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/slimbus/slim-ngd-qcom-ctrl.txt
> @@ -0,0 +1,70 @@
> +Qualcomm SLIMBus Non Generic Device (NGD) Controller binding
> +
> +SLIMBus NGD controller is a light-weight driver responsible for communicating
> +with SLIMBus slaves directly over the bus using messaging interface and
> +communicating with master component residing on ADSP for bandwidth and
> +data-channel management
> +
> +Please refer to slimbus/bus.txt for details of the common SLIMBus bindings.
> +
> +- compatible:
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: must be "qcom,slim-ngd"

SoC specific compatible needed.

> +
> +- reg:
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: must specify the base address and size of the controller
> +		    register blocks.

blocks? Is there more than one? If so, how many?

> +
> +- reg-names:
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: must be "ctrl"

reg-names is pointless when there is only 1.

> +
> +- qcom,ngd-id
> +	Usage: required
> +	Value type: <u32>
> +	Definition: ngd instance id in the controller

Why do you need this?

> +- dmas
> +	Usage: required
> +	Value type: <array of phandles>
> +	Definition: List of rx and tx dma channels
> +
> +- dma-names
> +	Usage: required
> +	Value type: <stringlist>
> +	Definition: must be "rx" and "tx".
> +
> +- interrupts:
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: must list controller IRQ.
> +
> +#address-cells
> +	Usage: required
> +	Refer to slimbus/bus.txt for details of the common SLIMBus bindings.
> +
> +#size-cells
> +	Usage: required
> +	Refer to slimbus/bus.txt for details of the common SLIMBus bindings.
> +
> += EXAMPLE
> +
> +slim@...0000 {
> +	compatible = "qcom,slim-ngd";
> +	reg = <0x91c0000 0x2C000>;
> +	reg-names = "ctrl";
> +	interrupts = <0 163 0>;
> +	qcom,ngd-id = <1>;
> +	dmas =	<&slimbam 3>, <&slimbam 4>;
> +	dma-names = "rx", "tx";
> +
> +	#address-cells = <1>;
> +	#size-cells = <1>;
> +	codec@1 {
> +		compatible = "slim217,1a0";
> +		reg  = <1 0>;
> +	};
> +};
> -- 
> 2.16.2
>