Re: [PATCH v3] dt-bindings: display: anx7814.txt: convert to yaml

[Rob Herring <robh@kernel.org>]

On Mon, Apr 27, 2020 at 03:52:44PM +0200, Enric Balletbo i Serra wrote:
> Hi Ricardo,
> 
> Thank you for your patch.
> 
> On 27/4/20 12:09, Ricardo Cañuelo wrote:
> > This converts the Analogix ANX7814 bridge DT binding to yaml. Port
> > definitions and descriptions were expanded, apart from that it's a
> > direct translation from the original binding.
> > 
> > Signed-off-by: Ricardo Cañuelo <ricardo.canuelo@collabora.com>
> > Acked-by: Sam Ravnborg <sam@ravnborg.org>
> > ---
> > Changes in v3 (suggested by Sam Ravnborg):
> >   - Rename example node i2c0 to i2c.
> > 
> > Changes in v2 (suggested by Enric Balletbo):
> >   - File name change: use full compatible string.
> >   - Binding description removed.
> >   - #address-cells and #size-cells properties removed from ports node.
> >   - Example node renamed: anx7814 -> bridge.
> > 
> > Tested with:
> > make dt_binding_check ARCH=arm64 DT_SCHEMA_FILES=<.../analogix,anx7814.yaml>
> > make dtbs_check ARCH=arm64 DT_SCHEMA_FILES=<.../analogix,anx7814.yaml>
> > 
> >  .../display/bridge/analogix,anx7814.yaml      | 124 ++++++++++++++++++
> >  .../bindings/display/bridge/anx7814.txt       |  42 ------
> >  2 files changed, 124 insertions(+), 42 deletions(-)
> >  create mode 100644 Documentation/devicetree/bindings/display/bridge/analogix,anx7814.yaml
> >  delete mode 100644 Documentation/devicetree/bindings/display/bridge/anx7814.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/display/bridge/analogix,anx7814.yaml b/Documentation/devicetree/bindings/display/bridge/analogix,anx7814.yaml
> > new file mode 100644
> > index 000000000000..13f0b52edefd
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/bridge/analogix,anx7814.yaml
> > @@ -0,0 +1,124 @@
> > +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> > +%YAML 1.2
> > +---
> > +$id: http://devicetree.org/schemas/display/bridge/analogix,anx7814.yaml#
> > +$schema: http://devicetree.org/meta-schemas/core.yaml#
> > +
> > +title: Analogix ANX7814 SlimPort (Full-HD Transmitter)
> > +
> > +maintainers:
> > +  - Enric Balletbo i Serra <enric.balletbo@collabora.com>
> > +
> > +properties:
> > +  compatible:
> > +    enum:
> > +      - analogix,anx7808
> > +      - analogix,anx7812
> > +      - analogix,anx7814
> > +      - analogix,anx7818
> > +
> > +  reg:
> > +    maxItems: 1
> > +    description: I2C address of the device.
> > +
> > +  interrupts:
> > +    maxItems: 1
> > +    description: Should contain the INTP interrupt.
> > +
> > +  hpd-gpios:
> > +    maxItems: 1
> > +    description: Which GPIO to use for hpd.
> > +
> > +  pd-gpios:
> > +    maxItems: 1
> > +    description: Which GPIO to use for power down.
> > +
> > +  reset-gpios:
> > +    maxItems: 1
> > +    description: Which GPIO to use for reset.
> > +
> > +  dvdd10-supply:
> > +    maxItems: 1
> > +    description: Regulator for 1.0V digital core power.
> > +
> > +  ports:
> > +    type: object
> > +    description:
> > +      A node containing input and output port nodes with endpoint
> > +      definitions as documented in
> > +      Documentation/devicetree/bindings/media/video-interfaces.txt
> > +      Documentation/devicetree/bindings/graph.txt
> > +
> > +    properties:
> > +      port@0:
> > +        type: object
> > +        description: Video port for HDMI input.
> > +
> > +        properties:
> > +          reg:
> > +            const: 0
> > +
> > +      port@1:
> > +        type: object
> > +        description:
> > +          Video port for SlimPort, DisplayPort, eDP or MyDP output.
> > +
> > +        properties:
> > +          reg:
> > +            const: 1
> > +
> > +    required:
> > +      - port@0
> > +      - port@1
> > +
> > +required:
> > +  - compatible
> > +  - reg
> > +  - interrupts
> 
> See below ...
> 
> > +  - hpd-gpios
> > +  - pd-gpios
> > +  - reset-gpios
> 
> I know that these gpio attributes were required in the old binding and the
> driver handles these gpios as required, but assuming that we should really
> describe the hardware _not_ the driver, strictly talking, none of these gpios
> are really required. The same happens with the interrupt, you can left the pin
> floating and poll the registers.
> 
> So I am wondering if you should remove interrupts, *-gpios from required. Maybe
> Rob Herring can give us more light on this?

Agreed.

One step further is hpd-gpios should be deprecated as it should be in a 
connector node.

> 
> Other than that:
> 
> Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>
> 
> Thanks,
>  Enric
> 
> > +  - ports
> > +
> > +additionalProperties: false
> > +
> > +examples:
> > +  - |
> > +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> > +    #include <dt-bindings/gpio/gpio.h>
> > +
> > +    i2c {
> > +        #address-cells = <1>;
> > +        #size-cells = <0>;
> > +
> > +        anx7814: bridge@38 {
> > +            compatible = "analogix,anx7814";
> > +            reg = <0x38>;
> > +            interrupt-parent = <&gpio0>;
> > +            interrupts = <99 IRQ_TYPE_LEVEL_LOW>;   /* INTP */
> > +            hpd-gpios = <&pio 36 GPIO_ACTIVE_HIGH>;
> > +            pd-gpios = <&pio 33 GPIO_ACTIVE_HIGH>;
> > +            reset-gpios = <&pio 98 GPIO_ACTIVE_HIGH>;
> > +
> > +            ports {
> > +                #address-cells = <1>;
> > +                #size-cells = <0>;
> > +
> > +                port@0 {
> > +                    reg = <0>;
> > +                    anx7814_in: endpoint {
> > +                        remote-endpoint = <&hdmi0_out>;
> > +                    };
> > +                };
> > +
> > +                port@1 {
> > +                    reg = <1>;
> > +                    anx7814_out: endpoint {
> > +                        remote-endpoint = <&edp_out>;
> > +                    };
> > +                };
> > +            };
> > +        };
> > +    };
> > +
> > +...