linux-kernel - Re: [PATCH v4 1/2] dt-bindings: memory: mediatek: Add SMI reset and clamp for MT8188

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Message-ID: <b57f3a308dde77b26474cda349f61315ded51930.camel@mediatek.com>
Date: Fri, 7 Mar 2025 08:14:52 +0000
From: Friday Yang (杨阳) <Friday.Yang@...iatek.com>
To: "robh@...nel.org" <robh@...nel.org>, "matthias.bgg@...il.com"
	<matthias.bgg@...il.com>, Yong Wu (吴勇)
	<Yong.Wu@...iatek.com>, "p.zabel@...gutronix.de" <p.zabel@...gutronix.de>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	"krzk@...nel.org" <krzk@...nel.org>, "conor+dt@...nel.org"
	<conor+dt@...nel.org>
CC: "linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, "linux-mediatek@...ts.infradead.org"
	<linux-mediatek@...ts.infradead.org>, "devicetree@...r.kernel.org"
	<devicetree@...r.kernel.org>, Project_Global_Chrome_Upstream_Group
	<Project_Global_Chrome_Upstream_Group@...iatek.com>
Subject: Re: [PATCH v4 1/2] dt-bindings: memory: mediatek: Add SMI reset and
 clamp for MT8188

On Fri, 2025-03-07 at 08:04 +0100, Krzysztof Kozlowski wrote:
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
> 
> 
> On 07/03/2025 07:38, Friday Yang (杨阳) wrote:
> > On Thu, 2025-03-06 at 13:48 +0100, Krzysztof Kozlowski wrote:
> > > External email : Please do not click links or open attachments
> > > until
> > > you have verified the sender or the content.
> > > 
> > > 
> > > On 06/03/2025 13:45, Friday Yang (杨阳) wrote:
> > > > > > +          const: mediatek,mt8188-smi-larb
> > > > > > +        mediatek,larb-id:
> > > > > > +          oneOf:
> > > > > 
> > > > > Are you really sure that you need 'oneOf' here? :-)
> > > > > 
> > > > > Regards,
> > > > > Angelo
> > > > 
> > > > Yes, I have tested it. If I try to modify the 'examples'
> > > > like this. That is:
> > > >   change the compatible to "mediatek,mt8188-smi-larb",
> > > >   add 'mediatek,larb-id = <10>;'
> > > > 
> > > > examples:
> > > >   - |+
> > > >     #include <dt-bindings/clock/mt8173-clk.h>
> > > >     #includ
> > > > e <dt-bindings/power/mt8173-power.h>
> > > > 
> > > >     larb1: larb@...10000 {
> > > >       compatible = "mediatek,mt8188-smi-larb";
> > > >       reg = <0x16010000 0x1000>;
> > > >       mediatek,smi = <&smi_common>;
> > > >       mediatek,larb-id = <10>;
> > > >       power-domains = <&scpsys MT8188_POWER_DOMAIN_VDEC>;
> > > >       clocks = <&vdecsys CLK_VDEC_CKEN>,
> > > >                <&vdecsys CLK_VDEC_LARB_CKEN>;
> > > >       clock-names = "apb", "smi";
> > > >     };
> > > > 
> > > > The 'dt_binding_check' could give the following
> > > > errors:
> > > > 
> > > > Documentation/devicetree/bindings/memory-
> > > > controllers/mediatek,smi-
> > > > larb.example.dtb: larb@...10000: 'resets' is a required
> > > > property
> > > > from schema $id:
> > > > 
> > 
> > 
https://urldefense.com/v3/__http://devicetree.org/schemas/memory-controllers/mediatek,smi-larb.yaml*__;Iw!!CTRNKA9wMg0ARbw!kEwWhxyfjVtuHKBHazZGRaFdlmrU2bcIsiVDcsUDzEIManMw2XIG9RgOzq773vtmqlR9_sWZDFhU09SV$
> > > > Documentation/devicetree/bindings/memory-
> > > > controllers/mediatek,smi-
> > > > larb.example.dtb: larb@...10000: 'reset-names' is a required
> > > > property
> > > > from schema $id:
> > > > 
> > 
> > 
https://urldefense.com/v3/__http://devicetree.org/schemas/memory-controllers/mediatek,smi-larb.yaml*__;Iw!!CTRNKA9wMg0ARbw!kEwWhxyfjVtuHKBHazZGRaFdlmrU2bcIsiVDcsUDzEIManMw2XIG9RgOzq773vtmqlR9_sWZDFhU09SV$
> > > > 
> > > > And this is what I want to achieve. On the MediaTek MT8188 SoC
> > > > platform, 'resets' and 'reset-names' are only required for SMI
> > > > LARBs
> > > > located in image, camera and ipe subsys. Others can be ignored.
> > > > And
> > > > the
> > > > 'larb-id' of these SMI LARBs are shown in this array: [ 9, 10,
> > > > 11,
> > > > 12,
> > > > 13, 16, 17, 18, 19, 20 ].
> > > > 
> > > > Please feel free to let me know if you have any doubts.
> > > 
> > > You did not really answer the question. Where is anything about
> > > oneOf
> > > in
> > > your reply?
> > > 
> > > I am dropping this patchset from my queue.
> > > 
> > 
> > In this SoC, we encountered power-off failures and SMI bus hang
> > issues
> > during camera stress tests. SMI LARBs located in the image, IPE,
> > and
> > camera subsystems need to implement a reset, while other LARBs do
> > not
> > require it.
> > 
> > The 'mediatek,larb-id' for SMI LARBs in the image, IPE, and camera
> > subsystems are as follows:
> > - image subsystem: 9, 10, 11, 12, 16
> > - IPE subsystem: 13
> > - camera subsystem: 17, 18, 19, 20
> > 
> > Therefore, we believe that 'mediatek,larb-id' should be 'oneOf' the
> 
> 
> So explain me where is the second condition?
> 

Sorry for the misunderstanding. I should fix it like this:
just delete 'oneOf' and use 'enum'

  - if:  # only for camera and image subsys
      properties:
        com
patible:
          const: mediatek,mt8188-smi-larb
        mediatek,larb-
id:
          enum:
            [ 9, 10, 11, 12, 13, 16, 17, 18, 19, 20 ]

    then:
      required:
        - resets
        - reset-names

> Best regards,
> Krzysztof