linux-kernel - Re: [PATCH 1/2] dt-bindings: edac: Add DT bindings for Kryo EDAC

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Date:   Wed, 18 Dec 2019 17:37:14 -0600
From:   Rob Herring <robh@...nel.org>
To:     Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
Cc:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mark Rutland <mark.rutland@....com>,
        devicetree@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        James Morse <james.morse@....com>,
        Robert Richter <rrichter@...vell.com>,
        linux-edac@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        Stephen Boyd <swboyd@...omium.org>,
        Evan Green <evgreen@...omium.org>, tsoni@...eaurora.org,
        psodagud@...eaurora.org
Subject: Re: [PATCH 1/2] dt-bindings: edac: Add DT bindings for Kryo EDAC

On Thu, Dec 05, 2019 at 09:53:05AM +0000, Sai Prakash Ranjan wrote:
> This adds DT bindings for Kryo EDAC implemented with RAS
> extensions on KRYO{3,4}XX CPU cores for reporting of cache
> errors.
> 
> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
> ---
>  .../bindings/edac/qcom-kryo-edac.yaml         | 67 +++++++++++++++++++
>  1 file changed, 67 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/edac/qcom-kryo-edac.yaml
> 
> diff --git a/Documentation/devicetree/bindings/edac/qcom-kryo-edac.yaml b/Documentation/devicetree/bindings/edac/qcom-kryo-edac.yaml
> new file mode 100644
> index 000000000000..1a39429a73b4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/edac/qcom-kryo-edac.yaml
> @@ -0,0 +1,67 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/edac/qcom-kryo-edac.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Kryo Error Detection and Correction(EDAC)
> +
> +maintainers:
> +  - Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
> +
> +description: |
> +  Kryo EDAC is defined to describe on-chip error detection and correction
> +  for the Kryo CPU cores which implement RAS extensions. It will report
> +  all Single Bit Errors and Double Bit Errors found in L1/L2 caches in
> +  in two registers ERXSTATUS_EL1 and ERXMISC0_EL1. L3-SCU cache errors
> +  are reported in ERR1STATUS and ERR1MISC0 registers.
> +    ERXSTATUS_EL1 - Selected Error Record Primary Status Register, EL1
> +    ERXMISC0_EL1 - Selected Error Record Miscellaneous Register 0, EL1
> +    ERR1STATUS - Error Record Primary Status Register
> +    ERR1MISC0 - Error Record Miscellaneous Register 0
> +  Current implementation of Kryo ECC(Error Correcting Code) mechanism is
> +  based on interrupts.
> +
> +properties:
> +  compatible:
> +    enum:
> +      - qcom,kryo-edac
> +
> +  interrupts:
> +    minItems: 1
> +    maxItems: 4
> +    items:
> +      - description: l1-l2 cache faultirq interrupt
> +      - description: l1-l2 cache errirq interrupt
> +      - description: l3-scu cache errirq interrupt
> +      - description: l3-scu cache faultirq interrupt
> +
> +  interrupt-names:
> +    minItems: 1
> +    maxItems: 4

You are saying only these combinations are valid:

l1-l2-faultirq

l1-l2-faultirq
l1-l2-errirq

l1-l2-faultirq
l1-l2-errirq
l3-scu-errirq

l1-l2-faultirq
l1-l2-errirq
l3-scu-errirq
l3-scu-faultirq

Is that your intent?

> +    items:
> +      - const: l1-l2-faultirq
> +      - const: l1-l2-errirq
> +      - const: l3-scu-errirq
> +      - const: l3-scu-faultirq
> +
> +required:
> +  - compatible
> +  - interrupts
> +  - interrupt-names
> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    kryo_edac {
> +      compatible = "qcom,kryo-edac";
> +      interrupts = <GIC_PPI 6 IRQ_TYPE_LEVEL_HIGH>,
> +                   <GIC_PPI 7 IRQ_TYPE_LEVEL_HIGH>,
> +                   <GIC_SPI 34 IRQ_TYPE_LEVEL_HIGH>,
> +                   <GIC_SPI 35 IRQ_TYPE_LEVEL_HIGH>;
> +      interrupt-names = "l1-l2-faultirq",
> +                        "l1-l2-errirq",
> +                        "l3-scu-errirq",
> +                        "l3-scu-faultirq";
> +    };
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
>