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

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Date:   Wed, 18 Aug 2021 09:06:01 +0530
From:   Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>
To:     Rob Herring <robh@...nel.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 2021-08-18 02:58, Rob Herring wrote:
> 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.
> 

Hmm, I followed qcom,pil-info.yaml as a reference but maybe that's old.

>> +      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
> 

Sorry my mistake. I am dropping this series as we will move
to using PSCI_SYSTEM_RESET2 as detailed in cover letter.

Thanks,
Sai

> 
>> +        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
>> 
>> 

-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a 
member
of Code Aurora Forum, hosted by The Linux Foundation