linux-kernel - Re: [PATCH 1/2] dt-bindings: leds: Add cznic,turris1x-leds.yaml binding

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Date:   Tue, 5 Jul 2022 13:42:38 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Pavel Machek <pavel@....cz>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Marek Behún <kabel@...nel.org>,
        linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] dt-bindings: leds: Add cznic,turris1x-leds.yaml
 binding

On Tuesday 05 July 2022 13:36:54 Krzysztof Kozlowski wrote:
> On 05/07/2022 02:04, Pali Rohár wrote:
> > Add device-tree bindings documentation for Turris 1.x RGB LEDs.
> > 
> > Signed-off-by: Pali Rohár <pali@...nel.org>
> > ---
> >  .../bindings/leds/cznic,turris1x-leds.yaml    | 116 ++++++++++++++++++
> >  1 file changed, 116 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/leds/cznic,turris1x-leds.yaml
> > 
> > diff --git a/Documentation/devicetree/bindings/leds/cznic,turris1x-leds.yaml b/Documentation/devicetree/bindings/leds/cznic,turris1x-leds.yaml
> > new file mode 100644
> > index 000000000000..fd09613c8d2d
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/leds/cznic,turris1x-leds.yaml
> > @@ -0,0 +1,116 @@
> > +# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/leds/cznic,turris1x-leds.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: CZ.NIC's Turris 1.x LEDs driver
> > +
> > +maintainers:
> > +  - Pali Rohár <pali@...nel.org>
> > +
> > +description:
> > +  This module adds support for the RGB LEDs found on the front panel of the
> > +  Turris 1.x routers. There are 8 RGB LEDs that are controlled by CZ.NIC CPLD
> > +  firmware running on Lattice FPGA. Firmware is open source and available at
> > +  https://gitlab.nic.cz/turris/hw/turris_cpld/-/blob/master/CZ_NIC_Router_CPLD.v
> > +
> > +properties:
> > +  compatible:
> > +    const: cznic,turris1x-leds
> > +
> > +  reg:
> > +    maxItems: 2
> 
> You need to describe the items, if it is really two items. However your
> example has only one item, so this was not tested and won't work.

Ehm? Example has two items in the reg.

> You'll get warning from Rob's robot soon... but you should test the
> bindings instead.

I have tested bindings on the real hardware and it is working fine
together with the driver from patch 2/2.

> > +
> > +  "#address-cells":
> > +    const: 1
> > +
> > +  "#size-cells":
> > +    const: 0
> > +
> > +patternProperties:
> > +  "^multi-led@[0-7]$":
> > +    type: object
> > +    $ref: leds-class-multicolor.yaml#
> 
> This looks incorrect, unless you rebased on my patchset?

So what is the correct? (I used inspiration from
cznic,turris-omnia-leds.yaml file)

> > +
> > +    properties:
> > +      reg:
> > +        minimum: 0
> > +        maximum: 7
> > +
> > +    required:
> > +      - reg
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +
> 
> No blank line.

Ok.

> > +    #include <dt-bindings/leds/common.h>
> > +
> > +    cpld@3,0 {
> 
> Generic node name.

Is not cpld name generic enough?

> > +        #address-cells = <1>;
> > +        #size-cells = <1>;
> > +
> > +        led-controller@13 {
> > +            compatible = "cznic,turris1x-leds";
> > +            reg = <0x13 0x1d>;
> > +            #address-cells = <1>;
> > +            #size-cells = <0>;
> > +
> 
> 
> Best regards,
> Krzysztof