linux-kernel - Re: [PATCH RFC 2/4] dt-bindings/interrupt-controller: pdc: descibe PDC device binding

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Date:   Tue, 30 Jan 2018 09:20:12 -0600
From:   Rob Herring <robh@...nel.org>
To:     Lina Iyer <ilina@...eaurora.org>
Cc:     tglx@...utronix.de, jason@...edaemon.net, marc.zyngier@....com,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        sboyd@...eaurora.org, rnayak@...eaurora.org,
        asathyak@...eaurora.org, devicetree@...r.kernel.org
Subject: Re: [PATCH RFC 2/4] dt-bindings/interrupt-controller: pdc: descibe
 PDC device binding

On Tue, Jan 23, 2018 at 10:56:54AM -0700, Lina Iyer wrote:
> From: Archana Sathyakumar <asathyak@...eaurora.org>
> 
> Add device binding documentation for the PDC Interrupt controller on
> QCOM SoC's like the SDM845. The interrupt-controller can be used to
> sense edge low interrupts and wakeup interrupts when the GIC is
> non-operational.
> 
> Cc: devicetree@...r.kernel.org
> Signed-off-by: Archana Sathyakumar <asathyak@...eaurora.org>
> Signed-off-by: Lina Iyer <ilina@...eaurora.org>
> ---
>  .../bindings/interrupt-controller/qcom,pdc.txt     | 55 ++++++++++++++++++++++
>  1 file changed, 55 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/interrupt-controller/qcom,pdc.txt
> 
> diff --git a/Documentation/devicetree/bindings/interrupt-controller/qcom,pdc.txt b/Documentation/devicetree/bindings/interrupt-controller/qcom,pdc.txt
> new file mode 100644
> index 000000000000..c4592bbf678d
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/interrupt-controller/qcom,pdc.txt
> @@ -0,0 +1,55 @@
> +PDC interrupt controller
> +
> +Qualcomm Technologies Inc. SoCs based on the RPM Hardened archicture have a
> +Power Domain Controller (PDC) that is on always-on domain. In addition to
> +providing power control for the power domains, the hardware also has an
> +interrupt controller that can be used to help detect edge low interrupts as
> +well detect interrupts when the GIC is non-operational.
> +
> +GIC is parent interrupt controller at the highest level. Platform interrupt
> +controller PDC is next in hierarchy, followed by others. This driver only
> +configures the interrupts, does not handle them.
> +
> +Properties:
> +
> +- compatible:
> +	Usage: required
> +	Value type: <string>
> +	Definition: Should contain "qcom,pdc" and "qcom,pdc-<target>"
> +		    - "qcom,pdc-sdm845": For sdm845 pin data

pin data?

Convention is <soc>-<ip block>

Need to make the order of compatibles clear. Generally that is done with 
'followed by "qcom,pdc"' after the list of compatibles. But then, do you 
really need a fallback. This seems like a block that would change 
frequently. If there's not more than 2 or 3 chips with the same block, 
don't do a fallback.

> +
> +- reg:
> +	Usage: required
> +	Value type: <prop-encoded-array>
> +	Definition: Specifies the base physical address for PDC hardware.
> +
> +- interrupt-cells:
> +	Usage: required
> +	Value type: <u32>
> +	Definition: Specifies the number of cells needed to encode an interrupt
> +		    source.
> +		    Value must be 3.
> +		    The encoding of these cells are same as described in [1].
> +
> +- interrupt-parent:
> +	Usage: required
> +	Value type: <phandle>
> +	Definition: Specifies the interrupt parent necessary for hierarchical
> +		    domain to operate.
> +
> +- interrupt-controller:
> +	Usage: required
> +	Value type: <bool>
> +	Definition: Identifies the node as an interrupt controller.
> +
> +Example:
> +
> +	pdc: interrupt-controller@...0000 {
> +		compatible = "qcom,pdc", "qcom,pdc-sdm845";

This is backwards.

> +		reg = <0xb220000 0x30000>;
> +		#interrupt-cells = <3>;
> +		interrupt-parent = <&intc>;
> +		interrupt-controller;
> +	};
> +
> +[1]. Documentation/devicetree/bindings/interrupt-controller/arm,gic-v3.txt
> -- 
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
> 
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