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Date: Thu, 2 May 2019 11:09:35 +0100
From: Daniel Thompson <daniel.thompson@...aro.org>
To: Brian Masney <masneyb@...tation.org>, lee.jones@...aro.org,
jingoohan1@...il.com, robh+dt@...nel.org
Cc: jacek.anaszewski@...il.com, pavel@....cz, mark.rutland@....com,
b.zolnierkie@...sung.com, dri-devel@...ts.freedesktop.org,
linux-leds@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-fbdev@...r.kernel.org,
dmurphy@...com, jonathan@...ek.ca, Rob Herring <robh@...nel.org>,
Daniel Thompson <daniel@...felineninja.org.uk>
Subject: Re: [PATCH v6 2/3] dt-bindings: backlight: add lm3630a bindings
On 24/04/2019 10:25, Brian Masney wrote:
> Add new backlight bindings for the TI LM3630A dual-string white LED.
>
> Signed-off-by: Brian Masney <masneyb@...tation.org>
> Reviewed-by: Rob Herring <robh@...nel.org>
> Acked-by: Pavel Machek <pavel@....cz>
Acked-by: Daniel Thompson <daniel.thompson@...aro.org>
> ---
> Changes since v5:
> - Change 'lm3630a_bl@38' in examples to 'led-controller@38'
>
> Changes since v4:
> - Drop $ref from led-sources
> - Drop description from reg of i2c address
> - Expand description of reg for the control bank
> - Drop status from examples
>
> Changes since v3:
> - Add label. I didn't add a description for it since that'll come from
> the common properties once its converted.
>
> Changes since v2:
> - Update description of max-brightness
> - Add description for reg
> - Correct typo: s/tranisiton/transition
> - add reg to control banks
> - add additionalProperties
>
> .../leds/backlight/lm3630a-backlight.yaml | 129 ++++++++++++++++++
> 1 file changed, 129 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
>
> diff --git a/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml b/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
> new file mode 100644
> index 000000000000..4d61fe0a98a4
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/backlight/lm3630a-backlight.yaml
> @@ -0,0 +1,129 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/backlight/lm3630a-backlight.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: TI LM3630A High-Efficiency Dual-String White LED
> +
> +maintainers:
> + - Lee Jones <lee.jones@...aro.org>
> + - Daniel Thompson <daniel.thompson@...aro.org>
> + - Jingoo Han <jingoohan1@...il.com>
> +
> +description: |
> + The LM3630A is a current-mode boost converter which supplies the power and
> + controls the current in up to two strings of 10 LEDs per string.
> + https://www.ti.com/product/LM3630A
> +
> +properties:
> + compatible:
> + const: ti,lm3630a
> +
> + reg:
> + maxItems: 1
> +
> + ti,linear-mapping-mode:
> + description: |
> + Enable linear mapping mode. If disabled, then it will use exponential
> + mapping mode in which the ramp up/down appears to have a more uniform
> + transition to the human eye.
> + type: boolean
> +
> +required:
> + - compatible
> + - reg
> +
> +patternProperties:
> + "^led@[01]$":
> + type: object
> + description: |
> + Properties for a string of connected LEDs.
> +
> + properties:
> + reg:
> + description: |
> + The control bank that is used to program the two current sinks. The
> + LM3630A has two control banks (A and B) and are represented as 0 or 1
> + in this property. The two current sinks can be controlled
> + independently with both banks, or bank A can be configured to control
> + both sinks with the led-sources property.
> + maxItems: 1
> + minimum: 0
> + maximum: 1
> +
> + label:
> + maxItems: 1
> +
> + led-sources:
> + allOf:
> + - 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>;
> +
> + led-controller@38 {
> + compatible = "ti,lm3630a";
> + 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>;
> +
> + led-controller@38 {
> + compatible = "ti,lm3630a";
> + 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;
> + };
> + };
> + };
>
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