linux-kernel - Re: [RFC PATCH 5/6] arm64: dts: qcom: add base AIM500 dtsi

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Date: Tue, 20 Feb 2024 18:28:10 +0800
From: "Aiqun Yu (Maria)" <quic_aiquny@...cinc.com>
To: Jingyi Wang <quic_jingyw@...cinc.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>
CC: <linux-arm-msm@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <robh@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <kernel@...cinc.com>, Tingwei Zhang <quic_tingweiz@...cinc.com>
Subject: Re: [RFC PATCH 5/6] arm64: dts: qcom: add base AIM500 dtsi



On 2/20/2024 6:06 PM, Jingyi Wang wrote:
> Hi Dmitry,
> 
> On 2/20/2024 5:19 PM, Dmitry Baryshkov wrote:
>> On Tue, 20 Feb 2024 at 11:17, Jingyi Wang <quic_jingyw@...cinc.com> wrote:
>>>
>>> Hi Dmitry,
>>>
>>> On 2/5/2024 10:23 PM, Dmitry Baryshkov wrote:
>>>> On Mon, 5 Feb 2024 at 14:00, Jingyi Wang <quic_jingyw@...cinc.com> wrote:
>>>>>
>>>>> Introduce aim500 board dtsi.
>>>>
>>>> So, is it a board or a module?
>>>>
>>> aim500 is a module, will fix the descrption.
>>>
>>>>>
>>>>> AIM500 Series is a highly optimized family of modules designed to
>>>>> support AIoT and Generative AI applications based on sm8650p with
>>>>> PMIC and bluetooth functions etc.
>>>>>
>>>>> Co-developed-by: Tingwei Zhang <quic_tingweiz@...cinc.com>
>>>>> Signed-off-by: Tingwei Zhang <quic_tingweiz@...cinc.com>
>>>>> Signed-off-by: Jingyi Wang <quic_jingyw@...cinc.com>
>>>>> ---
>>>>>   arch/arm64/boot/dts/qcom/sm8650p-aim500.dtsi | 409 +++++++++++++++++++
>>>>>   1 file changed, 409 insertions(+)
>>>>>   create mode 100644 arch/arm64/boot/dts/qcom/sm8650p-aim500.dtsi
>>>>>
>>>>> diff --git a/arch/arm64/boot/dts/qcom/sm8650p-aim500.dtsi b/arch/arm64/boot/dts/qcom/sm8650p-aim500.dtsi
>>>>> new file mode 100644
>>>>> index 000000000000..cb857da8653b
>>>>> --- /dev/null
>>>>> +++ b/arch/arm64/boot/dts/qcom/sm8650p-aim500.dtsi
>>>>> @@ -0,0 +1,409 @@
>>>>> +// SPDX-License-Identifier: BSD-3-Clause
>>>>> +/*
>>>>> + * Copyright (c) 2024, Qualcomm Innovation Center, Inc. All rights reserved.
>>>>> + */
>>>>> +
>>>>> +#include <dt-bindings/regulator/qcom,rpmh-regulator.h>
>>>>> +#include "sm8650p.dtsi"
>>>>> +#include "pm8550.dtsi"
>>>>> +#include "pm8550b.dtsi"
>>>>> +#define PMK8550VE_SID 8
>>>>> +#include "pm8550ve.dtsi"
>>>>> +#include "pm8550vs.dtsi"
>>>>> +#include "pmk8550.dtsi"
>>>>> +
>>>>> +/ {
>>>>> +       aliases {
>>>>> +               serial1 = &uart14;
>>>>> +       };
>>>>> +
>>>>> +       vph_pwr: vph-pwr-regulator { };
>>>>
>>>> Is this regulator a part of the module or a part of the carrier board?
>>>> If the latter is true, this must go to the carrier board DT file.
>>>>
>>>
>>> the vph_pwr regulator is defined in the aim500-aiot carrier board and used
>>> in aim500 module.
>>
>> If it is defined in the carrier board, then please move it and
>> corresponding supply entries to the carrier board dts. Other devices
>> using the SoM can have different power tree.
>>
>> While we are at it, could you please rename the node to regulator-vph-pwr?
>>
>>
> will rename the node and move it to sm8650p-aim500-aiot.dts

Shall we have the VPH_PWR implementation inside the board dts file, and 
have the supply entries which used the VPH_PWR inside the SOM.dtsi file?

The VPH_PWR is an input IO of SOM. And the corresponding supply entries 
is inside the SOM hardware design as well.

The VPH_PWR as a fixed regulator implementation is the board design, it 
can be changed to other design from different boards.

Here is a simple diagram to show the hardware description of the VPH_PWR 
related design:

+------------------------------------------------------+ 
 

|                 Board                                | 
 

|                                                      | 
 

|           +-----------------+                        | 
 

|power----->| Fixed regulator-----------+              | 
 

|           +-----------------+         |              | 
 

|                                       |              | 
 

|                                       v VPH_PWR      | 
 

|                  +------|----------------------+     | 
 

|                  |      |    SOM       |       |     | 
 

|                  |      |              |       |     | 
 

|                  |      vVPH_PWR       vVPM_PWR|     | 
 

|                  |  +------+       +------+    |     | 
 

|                  |  | pmic1|       |pmic2 |    |     | 
 

|                  |  +------+       +------+    |     | 
 

|                  |                             |     | 
 

|                  +-----------------------------+     | 
 

+------------------------------------------------------+ 
 



> 
> Thanks,
> Jingyi

-- 
Thx and BRs,
Aiqun(Maria) Yu