linux-kernel - Re: [PATCH 2/3] dt-bindings: msm: Add QTI download mode support binding

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Date:   Tue, 17 Aug 2021 16:28:39 -0500
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>,
        devicetree@...r.kernel.org, Stephen Boyd <swboyd@...omium.org>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Sibi Sankar <sibis@...eaurora.org>
Subject: Re: [PATCH 2/3] dt-bindings: msm: Add QTI download mode support
 binding

On Thu, Aug 12, 2021 at 02:47:41PM +0530, Sai Prakash Ranjan wrote:
> Add device tree binding for QTI download mode cookies
> region found in IMEM.
> 
> Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
> ---
>  .../bindings/arm/msm/qcom,dload-mode.yaml     | 53 +++++++++++++++++++
>  1 file changed, 53 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/arm/msm/qcom,dload-mode.yaml
> 
> diff --git a/Documentation/devicetree/bindings/arm/msm/qcom,dload-mode.yaml b/Documentation/devicetree/bindings/arm/msm/qcom,dload-mode.yaml
> new file mode 100644
> index 000000000000..90b9b6a9b75e
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/arm/msm/qcom,dload-mode.yaml
> @@ -0,0 +1,53 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/arm/msm/qcom,dload-mode.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Qualcomm Download Mode binding
> +
> +maintainers:
> +  - Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
> +
> +description:
> +  Qualcomm download mode cookies memory region in IMEM is used by SDI
> +  (System Debug Image) firmware to determine whether to enter download
> +  mode or not to collect ramdump for post mortem debug.
> +
> +properties:
> +  compatible:
> +    const: qcom,dload-mode
> +
> +  reg:
> +    maxItems: 1
> +
> +  qcom,sdi-disable-regs:
> +    $ref: /schemas/types.yaml#/definitions/phandle-array
> +    description:
> +      Phandle reference to a syscon representing TCSR followed by the
> +      offset and length for SDI disable register.
> +
> +required:
> +  - compatible
> +  - reg
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    imem@...aa000 {
> +      compatible = "simple-mfd";

If this is just internal RAM, then we already have a binding for it and 
'simple-mfd' is not it.

> +      reg = <0x146aa000 0x2000>;
> +
> +      #address-cells = <1>;
> +      #size-cells = <1>;
> +
> +      ranges = <0 0x146aa000 0x2000>;
> +
> +      dload-mode@...0 {
> +        compatible = "qcom,dload-mode";
> +        reg = <0x1c00 0x1000>;

0x1c00 + 0x1000 > 0x2000


> +        qcom,sdi-disable-regs = <&tcsr_regs 0x3a000 0x4>;
> +      };
> +    };
> +...
> -- 
> QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
> of Code Aurora Forum, hosted by The Linux Foundation
> 
>