linux-kernel - Re: [PATCH 1/2] dt-bindings: rtc: Add TI K3 RTC devicetree bindings documentation

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Date:   Tue, 12 Apr 2022 17:17:43 -0500
From:   Nishanth Menon <nm@...com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
CC:     Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-rtc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Vignesh Raghavendra <vigneshr@...com>
Subject: Re: [PATCH 1/2] dt-bindings: rtc: Add TI K3 RTC devicetree bindings
 documentation

On 14:06-20220412, Krzysztof Kozlowski wrote:
> > +properties:
> > +  compatible:
> > +    items:
> 
> No need for items. Just enum under the compatible.

Will fix in next rev. Thanks for catching.

> 
> > +      - enum:
> > +          - ti,am62-rtc
> > +
> > +  reg:
> > +    maxItems: 1
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +
> > +  clocks:
> > +    items:
> > +      - description: VBUS Interface clock
> > +      - description: 32k Clock source (external or internal).
> > +
> > +  clock-names:
> > +    items:
> > +      - const: "vbus"
> > +      - const: "osc32k"
> 
> No quotes.

Uggh.. my bad. yup
> 
> > +
> > +  power-domains:
> > +    maxItems: 1
> > +
> > +  assigned-clocks:
> > +    description: |
> > +      override default osc32k parent clock reference to the osc32k clock entry
> > +    maxItems: 1
> > +
> > +  assigned-clock-parents:
> > +    description: |
> > +      override default osc32k parent clock phandle of the new parent clock of osc32k
> > +    maxItems: 1
> 
> Usually assigned-clockXXX are not needed in the bindings. Is here
> something different? They are put only to indicate something special.

I wonder if I should rather use unevaluatedproperties instead? If I use
additionalProperties: False, then the second example below fails.

Thoughts?
> 
> > +
> > +  wakeup-source: true
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> > +  - clocks
> > +  - clock-names
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +    rtc@...f0000 {
> > +        compatible = "ti,am62-rtc";
> > +        reg = <0x2b1f0000 0x100>;
> > +        interrupts = <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>;
> > +        power-domains = <&bar 0>;
> > +        clocks = <&foo 0>, <&foo 1>;
> > +        clock-names = "vbus", "osc32k";
> > +        wakeup-source;
> > +    };
> > +
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +    rtc@...f0000 {
> > +        compatible = "ti,am62-rtc";
> > +        reg = <0x2b1f0000 0x100>;
> > +        interrupts = <GIC_SPI 100 IRQ_TYPE_LEVEL_HIGH>;
> > +        power-domains = <&bar 0>;
> > +        clocks = <&foo 0>, <&foo 1>;
> > +        clock-names = "vbus", "osc32k";
> > +        wakeup-source;
> > +        assigned-clocks = <&foo 1>;
> > +        assigned-clock-parents = <&foo 2>;
> > +
> 
> Unneeded blank line.

Ack.

-- 
Regards,
Nishanth Menon
Key (0xDDB5849D1736249D) / Fingerprint: F8A2 8693 54EB 8232 17A3  1A34 DDB5 849D 1736 249D