linux-kernel - Re: [PATCH 1/2] dt-bindings: wkup-m3-ipc: Add vtt toggle bindings

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Date:   Tue, 12 Apr 2022 11:09:14 -0500
From:   Rob Herring <robh@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Drew Fustini <dfustini@...libre.com>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Nishanth Menon <nm@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Dave Gerlach <d-gerlach@...com>,
        Tony Lindgren <tony@...mide.com>, devicetree@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: wkup-m3-ipc: Add vtt toggle bindings

On Sat, Apr 09, 2022 at 06:25:24PM +0200, Krzysztof Kozlowski wrote:
> On 09/04/2022 06:51, Drew Fustini wrote:
> > Document the Wakeup M3 IPC properties that can be used to toggle the VTT
> > regulator during low power mode transitions.
> >
> 
> (...)
> 
> > @@ -51,6 +61,15 @@ properties:
> >        mbox_wkupm3 child node.
> >      maxItems: 1
> >  
> > +  ti,needs-vtt-toggle:
> > +    type: boolean
> > +    description: boards requires VTT toggling during suspend/resume
> > +
> > +  ti,vtt-gpio-pin:
> > +    $ref: /schemas/types.yaml#/definitions/uint32
> > +    description: pin on the GPIO0 module used for VTT toggle
> > +    maxItems: 1
> 
> No need for maxItems, it's a single uint32. You could add "maximum" if
> you know the constraints for the value.

Whenever I see the same problem repeated, I ask if we can catch with 
meta-schema. Often we can, but we have to fix all the existing ones:

media/mediatek,vcodec-encoder.yaml: properties:mediatek,scp:maxItems: False schema does not allow 1
media/mediatek,vcodec-encoder.yaml: properties:mediatek,vpu:maxItems: False schema does not allow 1
remoteproc/qcom,sc7280-wpss-pil.yaml: properties:glink-edge:properties:qcom,remote-pid:maxItems: False schema does not allow 1
media/mediatek,vcodec-subdev-decoder.yaml: properties:mediatek,scp:maxItems: False schema does not allow 1
media/mediatek,vcodec-decoder.yaml: properties:mediatek,vpu:maxItems: False schema does not allow 1
media/mediatek,vcodec-decoder.yaml: properties:mediatek,scp:maxItems: False schema does not allow 1
media/coda.yaml: properties:iram:maxItems: False schema does not allow 1
display/panel/panel-timing.yaml: properties:vsync-len:oneOf:0:maxItems: False schema does not allow 1
display/panel/panel-timing.yaml: properties:vsync-len:oneOf:0:items: False schema does not allow {'description': 'typical number of lines'}
display/panel/panel-timing.yaml: properties:hfront-porch:oneOf:0:maxItems: False schema does not allow 1
display/panel/panel-timing.yaml: properties:hfront-porch:oneOf:0:items: False schema does not allow {'description': 'typical number of pixels'}
display/panel/panel-timing.yaml: properties:hback-porch:oneOf:0:maxItems: False schema does not allow 1
display/panel/panel-timing.yaml: properties:hback-porch:oneOf:0:items: False schema does not allow {'description': 'typical number of pixels'}
display/panel/panel-timing.yaml: properties:hsync-len:oneOf:0:maxItems: False schema does not allow 1
display/panel/panel-timing.yaml: properties:hsync-len:oneOf:0:items: False schema does not allow {'description': 'typical number of pixels'}
display/panel/panel-timing.yaml: properties:vfront-porch:oneOf:0:maxItems: False schema does not allow 1
display/panel/panel-timing.yaml: properties:vfront-porch:oneOf:0:items: False schema does not allow {'description': 'typical number of lines'}
display/panel/panel-timing.yaml: properties:vback-porch:oneOf:0:maxItems: False schema does not allow 1
display/panel/panel-timing.yaml: properties:vback-porch:oneOf:0:items: False schema does not allow {'description': 'typical number of lines'}
iio/adc/st,stm32-dfsdm-adc.yaml: patternProperties:^filter@[0-9]+$:properties:st,filter-order:items: False schema does not allow {'minimum': 0, 'maximum': 5}
spi/renesas,sh-msiof.yaml: properties:renesas,rx-fifo-size:maxItems: False schema does not allow 1
spi/renesas,sh-msiof.yaml: properties:renesas,tx-fifo-size:maxItems: False schema does not allow 1
hwmon/ti,tmp421.yaml: patternProperties:^channel@([0-3])$:properties:ti,n-factor:items: False schema does not allow {'minimum': 0, 'maximum': 255}
hwmon/ti,tmp464.yaml: patternProperties:^channel@([0-8])$:properties:ti,n-factor:items: False schema does not allow {'minimum': -128, 'maximum': 127}

I already have fixes for these.

FYI, the meta-schema change looks like this:

diff --git a/dtschema/meta-schemas/keywords.yaml b/dtschema/meta-schemas/keywords.yaml
index 6d6fdfd08d3b..73ed113aed3a 100644
--- a/dtschema/meta-schemas/keywords.yaml
+++ b/dtschema/meta-schemas/keywords.yaml
@@ -155,3 +155,17 @@ properties:
       - type: boolean
   uniqueItems:
     type: boolean
+
+allOf:
+  - description: Scalar properties should not have array keywords
+    if:
+      properties:
+        $ref:
+          pattern: '(int[1-8]+|phandle|flag)$'
+      required:
+        - $ref
+    then:
+      properties:
+        maxItems: false
+        minItems: false
+        items: false