linux-kernel - Re: [PATCH v2 2/2] dt-bindings: add bindings for QCOM flash LED

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Date:   Fri, 30 Sep 2022 14:33:08 -0500
From:   Rob Herring <robh@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Fenglin Wu <quic_fenglinw@...cinc.com>
Cc:     linux-arm-msm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Pavel Machek <pavel@....cz>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        collinsd@...eaurora.org, subbaram@...eaurora.org
Subject: Re: [PATCH v2 2/2] dt-bindings: add bindings for QCOM flash LED

On Thu, Sep 29, 2022 at 02:40:05PM +0200, Krzysztof Kozlowski wrote:
> On 29/09/2022 14:15, Fenglin Wu wrote:
> > Add binding document for flash LED module inside Qualcomm Technologies,
> > Inc. PMICs.
> > 
> > Signed-off-by: Fenglin Wu <quic_fenglinw@...cinc.com>
> 
> Thank you for your patch. There is something to discuss/improve.
> 
> > +  reg:
> > +    description: address offset of the flash LED controller
> > +    maxItems: 1
> > +
> > +patternProperties:
> > +  "^led[0-3]$":
> 
> In such case: ^led-[0-9]$"
> 
> > +    type: object
> > +    $ref: common.yaml#
> > +    unevaluatedProperties: false
> > +    description: |
> > +      Represents the physical LED components which are connected to the
> > +      flash LED channels' output.
> > +
> > +    properties:
> > +      led-sources:

This is for when the power source and LED connection are programmable. 
IOW, when 'reg' is not enough to describe the configuration. If you only 
have LED channels 1-4 with a fixed connection to LED pins/output 1-4, 
then use 'reg'.

> > +        description: |
> > +          The HW indices of the flash LED channels that connect to the
> > +          physical LED
> > +        allOf:
> > +          - minItems: 1
> > +            maxItems: 2
> > +            items:
> > +              enum: [1, 2, 3, 4]
> > +
> > +      led-max-microamp:
> > +        description: |
> > +          The maximum current value when LED is not operating in flash mode (i.e. torch mode)
> > +          Valid values when an LED is connected to one flash LED channel:
> > +            5000 - 500000, step by 5000
> > +          Valid values when an LED is connected to two flash LED channels:
> > +            10000 - 1000000, step by 10000
> > +        minimum: 5000
> > +        maximum: 1000000

anyOf:
  - minimum: 5000
    maximum: 500000
    multipleOf: 5000
  - minimum: 10000
    maximum: 1000000
    multipleOf: 10000

Drop any description that's captured by the constraints.

> > +
> > +      flash-max-microamp:
> > +        description: |
> > +          The maximum current value when LED is operating in flash mode.
> > +          Valid values when an LED is connected to one flash LED channel:
> > +            12500 - 1500000, step by 12500
> > +          Valid values when an LED is connected to two flash LED channels:
> > +            25000 - 2000000, step by 12500
> > +        minimum: 12500
> > +        maximum: 2000000
> > +
> > +      flash-max-timeout-us:
> > +        description: |
> > +          The maximum timeout value when LED is operating in flash mode.
> > +          Valid values: 10000 - 1280000, step by 10000
> > +        minimum: 10000
> > +        maximum: 1280000

Similar comment for these 2.

> > +
> > +    required:
> > +      - led-sources
> > +      - led-max-microamp
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/leds/common.h>
> > +    spmi_bus {
> 
> No underscores in node names, so just "bus"

SPMI is something else though...