linux-kernel - Re: [EXT] Re: [PATCH 1/2 v8] dt-bindings: watchdog: marvell GTI system watchdog driver

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Message-ID: <20230527-wiring-coping-88eba4d91f3f@spud>
Date:   Sat, 27 May 2023 17:10:02 +0100
From:   Conor Dooley <conor@...nel.org>
To:     Bharat Bhushan <bbhushan2@...vell.com>
Cc:     "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 v8] dt-bindings: watchdog: marvell GTI
 system watchdog driver

On Sat, May 27, 2023 at 02:53:25PM +0000, Bharat Bhushan wrote:
> From: Conor Dooley <conor@...nel.org>
> > On Fri, May 26, 2023 at 11:56:25AM +0530, Bharat Bhushan wrote:

> > > +properties:
> > > +  compatible:
> > > +    enum:
> > > +      - marvell,cn9670-wdt
> > > +      - marvell,cn9880-wdt
> > > +      - marvell,cnf9535-wdt
> > > +      - marvell,cn10624-wdt
> > > +      - marvell,cn10308-wdt
> > > +      - marvell,cnf10518-wdt
> > 
> > static const struct of_device_id gti_wdt_of_match[] = {
> >        { .compatible = "marvell,cn9670-wdt", .data = &match_data_octeontx2},
> >        { .compatible = "marvell,cn9880-wdt", .data = &match_data_octeontx2},
> >        { .compatible = "marvell,cnf9535-wdt", .data = &match_data_octeontx2},
> >        { .compatible = "marvell,cn10624-wdt", .data = &match_data_cn10k},
> >        { .compatible = "marvell,cn10308-wdt", .data = &match_data_cn10k},
> >        { .compatible = "marvell,cnf10518-wdt", .data = &match_data_cn10k},
> > 
> > This is a fat hint that you should be using fallback compatibles here.
> > You even had a fallback setup in your last revision, but you seem to have
> > removed it alongside the removal of the wildcards. Why did you do that?
> 
> Not sure I understand this comment, Compatible in last version was as below:
> 
> + properties:
> + compatible:
> +    oneOf:
> +      - const: marvell,octeontx2-wdt
> +      - items:
> +          - enum:
> +              - marvell,octeontx2-95xx-wdt
> +              - marvell,octeontx2-96xx-wdt
> +              - marvell,octeontx2-98xx-wdt
> +          - const: marvell,octeontx2-wdt
> +      - const: marvell,cn10k-wdt
> +      - items:
> +          - enum:
> +              - marvell,cn10kx-wdt
> +              - marvell,cnf10kx-wdt
> +          - const: marvell,cn10k-wdt
> 
> By fallback do you mean " const: marvell,cn10k-wdt" and
> "const: marvell,octeontx2-wdt" ? If yes I removed because "octeontx2"
> and "cn10k" are soc family name and no a specific soc.

No, I meant that you should permit
	compatible = "marvell,cn9880-wdt", "marvell,cn9670-wdt";
and
	compatible = "marvell,cnf9535-wdt", "marvell,cn9670-wdt";
and
	compatible = "marvell,cn9670-wdt";
so the driver only needs to contain
	{ .compatible = "marvell,cn9670-wdt", .data = &match_data_octeontx2},
instead of 
	{ .compatible = "marvell,cn9670-wdt", .data = &match_data_octeontx2},
	{ .compatible = "marvell,cn9880-wdt", .data = &match_data_octeontx2},
	{ .compatible = "marvell,cnf9535-wdt", .data = &match_data_octeontx2},

Note that using fallback compatibles is separate from using wildcards,
and I was not suggesting that you go back to wildcards ;)

Cheers,
Conor.

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