[v4,2/3] dt-bindings: backlight: add lm3630a bindings

Add new backlight bindings for the TI LM3630A dual-string white LED.

Signed-off-by: Brian Masney <masneyb@onstation.org>
---
Rob: Since the common bindings aren't converted to the new JSON schema
yet, I'm not sure how to do led-sources here. I would expect that we'd
have the uint32-array on the common binding once it exists. I had to
add it here to keep 'make dt_binding_check' happy. I left the
description off though for that property since that'll come from common
once its converted.

Changes since v3:
- Add label. I didn't add a description for it since that'll come from
  the common properties once its converted.

Changes since v2:
- Update description of max-brightness
- Add description for reg
- Correct typo: s/tranisiton/transition
- add reg to control banks
- add additionalProperties

 .../leds/backlight/lm3630a-backlight.yaml     | 128 ++++++++++++++++++
 1 file changed, 128 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml

On Tue, Apr 16, 2019 at 6:54 PM Brian Masney <masneyb@onstation.org> wrote:
>
> Add new backlight bindings for the TI LM3630A dual-string white LED.
>
> Signed-off-by: Brian Masney <masneyb@onstation.org>
> ---
> Rob: Since the common bindings aren't converted to the new JSON schema
> yet, I'm not sure how to do led-sources here. I would expect that we'd
> have the uint32-array on the common binding once it exists. I had to
> add it here to keep 'make dt_binding_check' happy. I left the
> description off though for that property since that'll come from common
> once its converted.

What was the error? '$ref' shouldn't be needed for this. The tooling
has no knowledge whether there's common schema or not. So you probably
have some pattern the meta-schema doesn't like and we need to fix.

>
> Changes since v3:
> - Add label. I didn't add a description for it since that'll come from
>   the common properties once its converted.
>
> Changes since v2:
> - Update description of max-brightness
> - Add description for reg
> - Correct typo: s/tranisiton/transition
> - add reg to control banks
> - add additionalProperties
>
>  .../leds/backlight/lm3630a-backlight.yaml     | 128 ++++++++++++++++++
>  1 file changed, 128 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
>
> diff --git a/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml b/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
> new file mode 100644
> index 000000000000..5067038ca637
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
> @@ -0,0 +1,128 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/backlight/lm3630a-backlight.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: TI LM3630A High-Efficiency Dual-String White LED
> +
> +maintainers:
> +  - Lee Jones <lee.jones@linaro.org>
> +  - Daniel Thompson <daniel.thompson@linaro.org>
> +  - Jingoo Han <jingoohan1@gmail.com>
> +
> +description: |
> +  The LM3630A is a current-mode boost converter which supplies the power and
> +  controls the current in up to two strings of 10 LEDs per string.
> +  https://www.ti.com/product/LM3630A
> +
> +properties:
> +  compatible:
> +    const: ti,lm3630a
> +
> +  reg:
> +    description: The I2C address of the device

No need to describe a common property if there's nothing specific for
this device.

> +    maxItems: 1
> +
> +  ti,linear-mapping-mode:
> +    description: |
> +      Enable linear mapping mode. If disabled, then it will use exponential
> +      mapping mode in which the ramp up/down appears to have a more uniform
> +      transition to the human eye.
> +    type: boolean
> +
> +required:
> +  - compatible
> +  - reg
> +
> +patternProperties:
> +  "^led@[01]$":
> +    type: object
> +    description: |
> +      Properties for a string of connected LEDs.
> +
> +    properties:
> +      reg:
> +        description: Control Bank

Probably makes sense to have description here since this isn't a
standard type of address.

> +        maxItems: 1
> +        minimum: 0
> +        maximum: 1
> +
> +      label:
> +        maxItems: 1
> +
> +      led-sources:
> +        allOf:
> +          - $ref: /schemas/types.yaml#/definitions/uint32-array
> +          - minItems: 1
> +            maxItems: 2
> +            items:
> +              minimum: 0
> +              maximum: 1
> +
> +      default-brightness:
> +        description: Default brightness level on boot.
> +        minimum: 0
> +        maximum: 255
> +
> +      max-brightness:
> +        description: Maximum brightness that is allowed during runtime.
> +        minimum: 0
> +        maximum: 255
> +
> +    required:
> +      - reg
> +
> +    additionalProperties: false
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        lm3630a_bl@38 {

led-controller@38

> +                compatible = "ti,lm3630a";
> +                status = "ok";

Don't show status in examples.

> +                reg = <0x38>;
> +
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +
> +                led@0 {
> +                        reg = <0>;
> +                        led-sources = <0 1>;
> +                        label = "lcd-backlight";
> +                        default-brightness = <200>;
> +                        max-brightness = <255>;
> +                };
> +        };
> +    };
> +  - |
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        lm3630a_bl@38 {
> +                compatible = "ti,lm3630a";
> +                status = "ok";
> +                reg = <0x38>;
> +
> +                #address-cells = <1>;
> +                #size-cells = <0>;
> +
> +                led@0 {
> +                        reg = <0>;
> +                        default-brightness = <150>;
> +                        ti,linear-mapping-mode;
> +                };
> +
> +                led@1 {
> +                        reg = <1>;
> +                        default-brightness = <225>;
> +                        ti,linear-mapping-mode;
> +                };
> +        };
> +    };
> --
> 2.20.1
>

On Wed, Apr 17, 2019 at 08:34:33AM -0500, Rob Herring wrote:
> On Tue, Apr 16, 2019 at 6:54 PM Brian Masney <masneyb@onstation.org> wrote:
> >
> > Add new backlight bindings for the TI LM3630A dual-string white LED.
> >
> > Signed-off-by: Brian Masney <masneyb@onstation.org>
> > ---
> > Rob: Since the common bindings aren't converted to the new JSON schema
> > yet, I'm not sure how to do led-sources here. I would expect that we'd
> > have the uint32-array on the common binding once it exists. I had to
> > add it here to keep 'make dt_binding_check' happy. I left the
> > description off though for that property since that'll come from common
> > once its converted.
> 
> What was the error? '$ref' shouldn't be needed for this. The tooling
> has no knowledge whether there's common schema or not. So you probably
> have some pattern the meta-schema doesn't like and we need to fix.

Ahh, you're right... it works without the $ref. I just needed the
minItems and maxItems to fix the error I originally saw.

I'll wait for feedback from Dan before I send out another version with
your changes.

Thanks,

Brian