linux-kernel - Re: [RFC PATCH v3 04/15] dt-bindings: leds: ROHM BD71282 PMIC LED driver

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Date:   Tue, 5 Nov 2019 14:59:34 -0600
From:   Rob Herring <robh@...nel.org>
To:     Dan Murphy <dmurphy@...com>
Cc:     Matti Vaittinen <matti.vaittinen@...rohmeurope.com>,
        mazziesaccount@...il.com,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Pavel Machek <pavel@....cz>,
        Mark Rutland <mark.rutland@....com>,
        Lee Jones <lee.jones@...aro.org>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-gpio@...r.kernel.org, linux-rtc@...r.kernel.org
Subject: Re: [RFC PATCH v3 04/15] dt-bindings: leds: ROHM BD71282 PMIC LED
 driver

On Tue, Nov 05, 2019 at 01:14:33PM -0600, Dan Murphy wrote:
> Matti
> 
> On 11/1/19 6:32 AM, Matti Vaittinen wrote:
> > Document ROHM BD71828 PMIC LED driver device tree bindings.
> > 
> > Signed-off-by: Matti Vaittinen <matti.vaittinen@...rohmeurope.com>
> > ---
> > 
> > Changes from v2 - new patch
> > 
> >   .../bindings/leds/rohm,leds-bd71828.yaml      | 46 +++++++++++++++++++
> >   1 file changed, 46 insertions(+)
> >   create mode 100644 Documentation/devicetree/bindings/leds/rohm,leds-bd71828.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/leds/rohm,leds-bd71828.yaml b/Documentation/devicetree/bindings/leds/rohm,leds-bd71828.yaml
> > new file mode 100644
> > index 000000000000..d8aeac9911ef
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/leds/rohm,leds-bd71828.yaml
> > @@ -0,0 +1,46 @@
> > +# SPDX-License-Identifier: GPL-2.0
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/leds/rohm,leds-bd71828.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: ROHM BD71828 Power Management Integrated Circuit LED driver
> > +
> > +maintainers:
> > +  - Jacek Anaszewski <jacek.anaszewski@...il.com>
> > +  - Pavel Machek <pavel@....cz>
> > +  - Dan Murphy <dmurphy@...com>
> > +  - Rob Herring <robh+dt@...nel.org>
> > +  - Mark Rutland <mark.rutland@....com>
> I believe you are the maintainer of this driver not the maintainers

Right, should have been clearer in my other response. Put 
owner/maintainer of the device binding, not subsystem.

> > +
> > +description: |
> > +  This module is part of the ROHM BD71828 MFD device. For more details
> > +  see Documentation/devicetree/bindings/mfd/rohm,bd71828-pmic.yaml.
> > +
> > +  The LED controller is represented as a sub-node of the PMIC node on the device
> > +  tree.
> > +
> > +  The device has two LED outputs referred as GRNLED and AMBLED in data-sheet.
> > +
> > +properties:
> > +  compatible:
> > +    const: rohm,bd71828-led
> > +
> > +patternProperties:
> > +  "^led-[1-2]$":
> > +    type: object
> > +    description:
> > +      Properties for a single LED. Nodes must be named as led-1 and led-2.
> 
> Why is this required?  Can't we use the reg as the number and then we can
> use standard node labels
> 
> like led@<reg value>.  Then we can check in the code to make sure that the
> output is not out of bounds.
> 
> > +    properties:
> > +      #$ref: "common.yaml#"
> > +      function:
> > +        description:
> > +          Purpose of LED as defined in dt-bindings/leds/common.h
> > +        $ref: "/schemas/types.yaml#/definitions/string"
> > +      color:
> > +        description:
> > +          LED colour as defined in dt-bindings/leds/common.h
> 
> s/colour/color
> 
> But again I believe it is indicated above that the LEDs are either going to
> be green or amber.  Unless they can be any color.
> 
> Are there plans to make sure that the color is either green or amber in the
> code?  I don't see a patch for the code in this series
> 
> > +        $ref: "/schemas/types.yaml#/definitions/uint32"
> > +
> > +required:
> > +  - compatible
> 
> Is there an example of the node and properties?

For MFDs, I prefer a complete example in the MFD binding doc. We need it 
complete to validate the example.

Rob