linux-kernel - RE: [EXT] Re: [PATCH 1/2 v7] dt-bindings: watchdog: marvell GTI system watchdog driver

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Message-ID: <DM5PR1801MB1883A414F47BB56E9537673AE3769@DM5PR1801MB1883.namprd18.prod.outlook.com>
Date:   Tue, 9 May 2023 09:01:39 +0000
From:   Bharat Bhushan <bbhushan2@...vell.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        "wim@...ux-watchdog.org" <wim@...ux-watchdog.org>,
        "linux@...ck-us.net" <linux@...ck-us.net>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "krzysztof.kozlowski+dt@...aro.org" 
        <krzysztof.kozlowski+dt@...aro.org>,
        "linux-watchdog@...r.kernel.org" <linux-watchdog@...r.kernel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Sunil Kovvuri Goutham <sgoutham@...vell.com>
Subject: RE: [EXT] Re: [PATCH 1/2 v7] dt-bindings: watchdog: marvell GTI
 system watchdog driver



> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
> Sent: Tuesday, May 9, 2023 1:38 PM
> To: Bharat Bhushan <bbhushan2@...vell.com>; wim@...ux-watchdog.org;
> linux@...ck-us.net; robh+dt@...nel.org; krzysztof.kozlowski+dt@...aro.org;
> linux-watchdog@...r.kernel.org; devicetree@...r.kernel.org; linux-
> kernel@...r.kernel.org; Sunil Kovvuri Goutham <sgoutham@...vell.com>
> Subject: Re: [EXT] Re: [PATCH 1/2 v7] dt-bindings: watchdog: marvell GTI system
> watchdog driver
> 
> On 09/05/2023 09:26, Bharat Bhushan wrote:
> 
> 
> >>> +properties:
> >>> +  compatible:
> >>> +    oneOf:
> >>> +      - const: marvell,octeontx2-wdt
> >>
> >> Why is this alone? Judging by the enum below, octeontx2 is not specific.
> >>
> >>> +      - items:
> >>> +          - enum:
> >>> +              - marvell,octeontx2-95xx-wdt
> >>> +              - marvell,octeontx2-96xx-wdt
> >>> +              - marvell,octeontx2-98xx-wdt
> >>
> >> We don't allow wildcards in general
> >
> > Marvell have octeontx2 series of processor which have watchdog timer.
> > In 95xx,98xx,96xx are the processors in octeontx2 series of processor. So
> octeontx2-95xx is on soc, octeontx2-96xx is another and so on.
> 
> No, 95xx is not a processor. Otherwise please point me to exact product
> datasheet. Hint: I checked it.

Looks like 95xx data sheet is not public, will remove in that case.

> 
> >
> >>
> >>> +          - const: marvell,octeontx2-wdt
> >>> +      - const: marvell,cn10k-wdt
> >>
> >> Same question - why is this alone?
> > Same here, Marvell have cn10k series of processors and cn10kx and cnf10kx are
> the processor in this series.
> 
> I don't understand how does it explain my concern. This is alone because there
> are series of processors? How is that related?

Tried to make it look like other drivers. Let's keep it simple, we want to enable this only for below ones

properties:
  compatible:
    enum:
     - marvell,cn10k-wdt
     - marvell,octeontx2-wdt

Are you good with that?

Thanks
-Bharat

> 
> >
> > One of the difference between octeontx2 and cn10k series processor is
> number of timers available. Which within the available set of timers one of the
> timer is programmed to be watchdog timer.
> 
> Wrap your replies. It's difficult to read.
> 
> >
> > Can you please propose how you want these compatible to be defined?
> 
> https://urldefense.proofpoint.com/v2/url?u=https-
> 3A__elixir.bootlin.com_linux_v6.4-
> 2Drc1_source_Documentation_devicetree_bindings_soc_qcom_qcom-
> 2Ceud.yaml-
> 23L19&d=DwICaQ&c=nKjWec2b6R0mOyPaz7xtfQ&r=PAAlWswPe7d8gHlGbCLmy
> 2YezyK7O3Hv_t2heGnouBw&m=sbDC9A17UO1l_M7xW5546TQhAMxoejy6M_sv
> PitOn_9sOxb0ru3H7X9eEW00Gqna&s=tQrCoVSHNEOd9CkEeu6leJbmP0rtbL5Vd
> WlE9GQ-GTI&e=
> 
> Best regards,
> Krzysztof