linux-kernel - Re: [PATCH 1/4] arm64: dts: ti: k3-j721e-mcu: Add the WKUP ESM instance

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Date: Wed, 10 Apr 2024 11:09:42 +0530
From: Neha Malcom Francis <n-francis@...com>
To: "Kumar, Udit" <u-kumar1@...com>, <robh@...nel.org>, <conor+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <vigneshr@...com>, <nm@...com>
CC: <linux-arm-kernel@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <kristo@...nel.org>
Subject: Re: [PATCH 1/4] arm64: dts: ti: k3-j721e-mcu: Add the WKUP ESM
 instance

Hi Udit,

On 10/04/24 10:42, Kumar, Udit wrote:
> Hi Neha
> 
> On 3/26/2024 5:57 PM, Neha Malcom Francis wrote:
>> Add the WKUP ESM instance for J721E. It has three instances in total,
>> one in the MAIN domain (main_esm) and two in the MCU-WKUP domain
>> (mcu_esm and wkup_esm).
>>
>> Signed-off-by: Neha Malcom Francis <n-francis@...com>
>> ---
>>   arch/arm64/boot/dts/ti/k3-j721e-mcu-wakeup.dtsi | 5 +++++
>>   1 file changed, 5 insertions(+)
>>
>> diff --git a/arch/arm64/boot/dts/ti/k3-j721e-mcu-wakeup.dtsi 
>> b/arch/arm64/boot/dts/ti/k3-j721e-mcu-wakeup.dtsi
>> index 4618b697fbc4..b0f41e9829cc 100644
>> --- a/arch/arm64/boot/dts/ti/k3-j721e-mcu-wakeup.dtsi
>> +++ b/arch/arm64/boot/dts/ti/k3-j721e-mcu-wakeup.dtsi
>> @@ -689,4 +689,9 @@ mcu_esm: esm@...00000 {
>>           ti,esm-pins = <95>;
>>           bootph-pre-ram;
>>       };
>> +
>> +    wkup_esm: esm@...80000 {
>> +        compatible = "ti,j721e-esm";
>> +        reg = <0x00 0x42080000 0x00 0x1000>;
> 
> I think , only  esm@...00000 should be good for this SOC.
> 
> I am not sure, why you want to add this. If you still want to add this for 
> completeness ,

Yes, I wanted to make sure all ESM modules are present for DTS completeness.
> 
> then two options, I suggest
> 
> 1) If you plan to use this mention bootph-pre-ram and ti,esm-pins
> 

No plans for using it as of now.

J721E ESM interrupt routing is such that the MAIN_ESM interrupt triggers an 
error event in the MCU_ESM (which is correctly set via their node ti,j721e-esm 
glue logic pins). The MCU_ESM and WKUP_ESM both generate the same interrupt 
after. So there is no ti,j721e-esm pin applicable for WKUP_ESM.

> 2) In case , no plan to use this then please mark node as disabled
> 

Yes I will mark this as disabled, I overlooked the fact that leaving this 
enabled would throw "ESM init failed" when DT syncs with U-Boot. Thanks for 
catching!

> 
>> +    };
>>   };

-- 
Thanking You
Neha Malcom Francis