linux-kernel - Re: [PATCH v4 3/5] dt-bindings: watchdog: qcom-wdt: Document qcom,imem property

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Message-ID: <37bd619d-242e-4488-8d45-c2c85612bee9@oss.qualcomm.com>
Date: Tue, 20 May 2025 18:00:49 +0200
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Krzysztof Kozlowski <krzk@...nel.org>,
        Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
Cc: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck
 <linux@...ck-us.net>,
        Rajendra Nayak <quic_rjendra@...cinc.com>,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v4 3/5] dt-bindings: watchdog: qcom-wdt: Document
 qcom,imem property

On 5/20/25 9:25 AM, Krzysztof Kozlowski wrote:
> On Mon, May 19, 2025 at 02:04:03PM GMT, Kathiravan Thirumoorthy wrote:
>> Document the "qcom,imem" property for the watchdog device on Qualcomm
>> IPQ platforms. Use this property to extract the restart reason from
>> IMEM, which is updated by XBL. Populate the watchdog's bootstatus sysFS
>> entry with this information, when the system reboots due to a watchdog
>> timeout.
>>
>> Describe this property for the IPQ5424 watchdog device and extend support
>> to other targets subsequently.
>>
>> Signed-off-by: Kathiravan Thirumoorthy <kathiravan.thirumoorthy@....qualcomm.com>
>> ---
>> Changes in v4:
>> 	- New patch
>> ---
>>  .../devicetree/bindings/watchdog/qcom-wdt.yaml       | 20 ++++++++++++++++++++
>>  1 file changed, 20 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/watchdog/qcom-wdt.yaml b/Documentation/devicetree/bindings/watchdog/qcom-wdt.yaml
>> index 49e2b807db0bc9d3edfc93ec41ad0df0b74ed032..bbe9b68ff4c8b813744ffd86bb52303943366fa2 100644
>> --- a/Documentation/devicetree/bindings/watchdog/qcom-wdt.yaml
>> +++ b/Documentation/devicetree/bindings/watchdog/qcom-wdt.yaml
>> @@ -81,6 +81,16 @@ properties:
>>      minItems: 1
>>      maxItems: 5
>>  
>> +  qcom,imem:
> 
> Shoouldn't this be existing 'sram' property? If IMEM is something
> similar to OCMEM, then we already use sram for that.

We specifically want a handle to a predefined byte in IMEM, something akin
to qcom,4ln-config-sel in

Documentation/devicetree/bindings/phy/qcom,sc8280xp-qmp-pcie-phy.yaml

Konrad