linux-kernel - Re: [PATCH v2 1/4] dt-bindings: backlight: Add max25014 bindings

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Message-ID: <20250819195008.GA1218175-robh@kernel.org>
Date: Tue, 19 Aug 2025 14:50:08 -0500
From: Rob Herring <robh@...nel.org>
To: Maud Spierings <maudspierings@...ontroll.com>
Cc: Lee Jones <lee@...nel.org>, Daniel Thompson <danielt@...nel.org>,
	Jingoo Han <jingoohan1@...il.com>, Pavel Machek <pavel@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Helge Deller <deller@....de>,
	Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.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,
	imx@...ts.linux.dev, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 1/4] dt-bindings: backlight: Add max25014 bindings

On Tue, Aug 19, 2025 at 12:58:59PM +0200, Maud Spierings wrote:
> The Maxim MAX25014 is a 4-channel automotive grade backlight driver IC
> with intgrated boost controller.
> 
> Signed-off-by: Maud Spierings <maudspierings@...ontroll.com>
> ---
>  .../bindings/leds/backlight/maxim,max25014.yaml    | 79 ++++++++++++++++++++++
>  MAINTAINERS                                        |  5 ++
>  2 files changed, 84 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/leds/backlight/maxim,max25014.yaml b/Documentation/devicetree/bindings/leds/backlight/maxim,max25014.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..30b591152fa31d5e43243cac44c72028b05b5f8a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/backlight/maxim,max25014.yaml
> @@ -0,0 +1,79 @@
> +# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/leds/backlight/maxim,max25014.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Maxim max25014 backlight controller
> +
> +maintainers:
> +  - Maud Spierings <maudspierings@...ontroll.com>
> +
> +allOf:
> +  - $ref: common.yaml#
> +
> +properties:
> +  compatible:
> +    enum:
> +      - maxim,max25014
> +
> +  reg:
> +    maxItems: 1
> +
> +  enable-gpios:
> +    maxItems: 1
> +
> +  interrupts:
> +    maxItems: 1
> +
> +  power-supply:
> +    description: Regulator which controls the boost converter input rail.
> +
> +  pwms:
> +    maxItems: 1
> +
> +  maxim,iset:
> +    $ref: /schemas/types.yaml#/definitions/uint32

       maximum: 15

> +    default: 11
> +    description:
> +      Value of the ISET register field (0-15).

Perhaps a little on what this controls? 

> +
> +  maxim,strings:
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    description:
> +      A 4-bit bitfield that describes which led strings to turn on.
> +    minItems: 4
> +    maxItems: 4

       items:
         maximum: 1

But why not just an 8-bit value 0x0-0xF?

> +
> +required:
> +  - compatible
> +  - reg
> +  - maxim,strings
> +
> +unevaluatedProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    i2c {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        backlight: backlight@6f {

Drop unused labels.

> +            reg = <0x6f>;
> +            compatible = "maxim,max25014";

compatible is always first.

> +            default-brightness = <50>;
> +            enable-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
> +            interrupt-parent = <&gpio1>;
> +            interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
> +            pinctrl-names = "default";
> +            pinctrl-0 = <&pinctrl_backlight>;

Generally we don't put pinctrl properties in examples as they are always 
allowed.

> +            power-supply = <&reg_backlight>;
> +            pwms = <&pwm1>;
> +            maxim,iset = <7>;
> +            maxim,strings = <1 1 1 1>;
> +        };
> +    };
> +
> diff --git a/MAINTAINERS b/MAINTAINERS
> index e81d5f9fbd16cc384356804390d65652bbb9e3f6..11c73d2e37fac22aea852152746236c1472f41b8 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14972,6 +14972,11 @@ F:	Documentation/userspace-api/media/drivers/max2175.rst
>  F:	drivers/media/i2c/max2175*
>  F:	include/uapi/linux/max2175.h
>  
> +MAX25014 BACKLIGHT DRIVER
> +M:	Maud Spierings <maudspierings@...ontroll.com>
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/leds/backlight/maxim,max25014.yaml
> +
>  MAX31335 RTC DRIVER
>  M:	Antoniu Miclaus <antoniu.miclaus@...log.com>
>  L:	linux-rtc@...r.kernel.org
> 
> -- 
> 2.50.1
>