linux-kernel - Re: [PATCH v2 1/1] dt-bindings: leds: convert leds-lm3692x to yaml format

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Message-ID: <20240821-sizable-jumbo-1a114a8cc53a@spud>
Date: Wed, 21 Aug 2024 16:15:34 +0100
From: Conor Dooley <conor@...nel.org>
To: Frank Li <Frank.Li@....com>
Cc: Pavel Machek <pavel@....cz>, Lee Jones <lee@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Dan Murphy <dmurphy@...com>,
	"open list:LED SUBSYSTEM" <linux-leds@...r.kernel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" <devicetree@...r.kernel.org>,
	open list <linux-kernel@...r.kernel.org>, imx@...ts.linux.dev
Subject: Re: [PATCH v2 1/1] dt-bindings: leds: convert leds-lm3692x to yaml
 format

On Tue, Aug 20, 2024 at 02:35:43PM -0400, Frank Li wrote:
> Convert binding doc leds-lm3592x to yaml format.
> Additional change
> - Add ref to common.yaml for child node
> - Add i2c node at example
> 
> Fix below warning:
> arch/arm64/boot/dts/freescale/imx8mq-librem5-r2.dtb: /soc@...us@...00000/i2c@...40000/backlight@36:
> 	failed to match any schema with compatible: ['ti,lm36922']
> 
> Signed-off-by: Frank Li <Frank.Li@....com>
> diff --git a/Documentation/devicetree/bindings/leds/ti.lm36922.yaml b/Documentation/devicetree/bindings/leds/ti.lm36922.yaml
> new file mode 100644
> index 0000000000000..ac98547b78bd2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/ti.lm36922.yaml
> @@ -0,0 +1,100 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/ti.lm36922.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Texas Instruments - LM3692x Highly Efficient White LED Driver
> +
> +maintainers:
> +  - Dan Murphy <dmurphy@...com>
> +
> +description: |
> +  The LM3692x is an ultra-compact, highly efficient,
> +  white-LED driver designed for LCD display backlighting.
> +
> +  The main difference between the LM36922 and LM36923 is the number of
> +  LED strings it supports. The LM36922 supports two strings while the LM36923
> +  supports three strings.
> +
> +  For more product information please see the link below:
> +  https://www.ti.com/lit/ds/snvsa29/snvsa29.pdf
> +
> +properties:
> +  compatible:
> +    enum:
> +      - ti,lm36922
> +      - ti,lm36923
> +
> +  reg:
> +    maxItems: 1
> +
> +  "#address-cells":
> +    const: 1
> +
> +  "#size-cells":
> +    const: 0
> +
> +  enable-gpios:
> +    description: gpio pin to enable/disable the device.

I think the description could be replaced with just marking the property
as "true", both here and for the supply. The descriptions are statements
of the obvious.

> +
> +  vled-supply:
> +    description: LED supply
> +
> +  ti,ovp-microvolt:
> +    description: Overvoltage protection.
> +    default: 29000000
> +    enum: [17000000, 21000000, 25000000, 29000000]
> +
> +patternProperties:
> +  '^led@[0-9a-f]+$':

There's no need for such a permissive pattern here, since reg is limited
to the range 0-3. Additionally, I would add an
allOf:
  - if:
      properties:
        compatible:
          contains:
            const: ti,lm36922
    then:
      properties:
        led@3: false

or similar to restrict the third entry instead of doing so in prose.

Thanks,
Conor.

> +    type: object
> +    $ref: common.yaml
> +    properties:
> +      reg:
> +        enum: [0, 1, 2, 3]
> +        description: |
> +          0 - Will enable all LED sync paths
> +          1 - Will enable the LED1 sync
> +          2 - Will enable the LED2 sync
> +          3 - Will enable the LED3 sync (LM36923 only)
> +
> +    unevaluatedProperties: false
> +
> +required:
> +  - compatible
> +  - reg
> +  - "#address-cells"
> +  - "#size-cells"
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/leds/common.h>
> +
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        led-controller@36 {
> +            compatible = "ti,lm36922";
> +            reg = <0x36>;
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            enable-gpios = <&gpio1 28 GPIO_ACTIVE_HIGH>;
> +            vled-supply = <&vbatt>;
> +            ti,ovp-microvolt = <29000000>;
> +
> +            led@0 {
> +                reg = <0>;
> +                function = LED_FUNCTION_BACKLIGHT;
> +                color = <LED_COLOR_ID_WHITE>;
> +                linux,default-trigger = "backlight";
> +                led-max-microamp = <20000>;
> +            };
> +        };
> +    };
> +
> -- 
> 2.34.1
> 

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