linux-kernel - Re: [PATCH 1/7] dt-bindings: soc: add bindings for i.MX93 SRC

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Message-ID: <5bcbf7d3-daa8-6f00-6743-3d0328a82980@linaro.org>
Date:   Thu, 26 May 2022 14:08:12 +0200
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
To:     Peng Fan <peng.fan@....com>,
        "Peng Fan (OSS)" <peng.fan@....nxp.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "sboyd@...nel.org" <sboyd@...nel.org>,
        "mturquette@...libre.com" <mturquette@...libre.com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>,
        "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>
Cc:     Aisheng Dong <aisheng.dong@....com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "festevam@...il.com" <festevam@...il.com>,
        dl-linux-imx <linux-imx@....com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/7] dt-bindings: soc: add bindings for i.MX93 SRC

On 24/05/2022 14:07, Peng Fan wrote:
>> Subject: Re: [PATCH 1/7] dt-bindings: soc: add bindings for i.MX93 SRC
>>
>> On 24/05/2022 12:37, Peng Fan wrote:
>>>> Subject: Re: [PATCH 1/7] dt-bindings: soc: add bindings for i.MX93
>>>> SRC
>>>>
>>>> On 23/05/2022 13:30, Peng Fan (OSS) wrote:
>>>>> From: Peng Fan <peng.fan@....com>
>>>>>
>>>>> Add bindings for i.MX93 System Reset Controller(SRC). SRC supports
>>>>> resets and power gating for mixes.
>>>>>
>>>>> Signed-off-by: Peng Fan <peng.fan@....com>
>>>>> ---
>>>>>  .../bindings/soc/imx/fsl,imx93-src.yaml       | 88
>>>> +++++++++++++++++++
>>>>>  include/dt-bindings/power/imx93-power.h       | 11 +++
>>>>>  2 files changed, 99 insertions(+)
>>>>>  create mode 100644
>>>>> Documentation/devicetree/bindings/soc/imx/fsl,imx93-src.yaml
>>>>
>>>> File should be in respective subsystem, so probably power/reset?
>>>
>>> ok, will put under power.
>>>
>>>>
>>>>>  create mode 100644 include/dt-bindings/power/imx93-power.h
>>>>>
>>>>> diff --git
>>>>> a/Documentation/devicetree/bindings/soc/imx/fsl,imx93-src.yaml
>>>>> b/Documentation/devicetree/bindings/soc/imx/fsl,imx93-src.yaml
>>>>> new file mode 100644
>>>>> index 000000000000..d45c1458b9c1
>>>>> --- /dev/null
>>>>> +++ b/Documentation/devicetree/bindings/soc/imx/fsl,imx93-src.yaml
>>>>> @@ -0,0 +1,88 @@
>>>>> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause) %YAML 1.2
>>>>> +---
>>>>> +$id:
>>>>> +> > +title: NXP i.MX9 System Reset Controller
>>>>> +
>>>>> +maintainers:
>>>>> +  - Peng Fan <peng.fan@....com>
>>>>> +
>>>>> +description: |
>>>>> +  The System Reset Controller (SRC) is responsible for the
>>>>> +generation of
>>>>> +  all the system reset signals and boot argument latching.
>>>>> +
>>>>> +  Its main functions are as follows,
>>>>> +  - Deals with all global system reset sources from other modules,
>>>>> +    and generates global system reset.
>>>>> +  - Responsible for power gating of MIXs (Slices) and their memory
>>>>> +    low power control.
>>>>> +
>>>>> +properties:
>>>>> +  compatible:
>>>>> +    items:
>>>>> +      - const: fsl,imx93-src
>>>>> +      - const: syscon
>>>>> +
>>>>> +  reg:
>>>>> +    maxItems: 1
>>>>> +
>>>>> +  slice:
>>>>
>>>> Why do you need this subnode, instead of listing domains here?
>>>
>>> I follow
>>> Documentation/devicetree/bindings/power/fsl,imx-gpcv2.yaml
>>>
>>> There are several slices in SRC, just like there are many pgcs in gpcv2.
>>
>> Wait, but you have only one slice and you do no allow more of them. 
> 
> Slice is just a group node that could include many child nodes,
> such as 
> slice {
>   mediamix {
>   };
>   mlmix {
>   };
> }
> 
> The same
>> as for gpcv2 - there is only one pgc. What's the point of that node?
> 
> There are many pgcs, pgc is just a group node there,
> See arch/arm64/boot/dts/freescale/imx8mp.dtsi.

So this does not explain my question at all. Why do you need "slice" (or
pgc) node? You have only one slice in this device, so this is some
indirect layer without meaning...


Best regards,
Krzysztof