linux-kernel - Re: [PATCH v3 1/4] dt-bindings: backlight: Add max25014 bindingsy

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Message-ID: <aMLrrcBZ2Kc4o84t@lizhi-Precision-Tower-5810>
Date: Thu, 11 Sep 2025 11:33:01 -0400
From: Frank Li <Frank.li@....com>
To: maudspierings@...ontroll.com
Cc: Lee Jones <lee@...nel.org>, Daniel Thompson <danielt@...nel.org>,
	Jingoo Han <jingoohan1@...il.com>, Pavel Machek <pavel@...nel.org>,
	Rob Herring <robh@...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 v3 1/4] dt-bindings: backlight: Add max25014 bindingsy

On Thu, Sep 11, 2025 at 09:53:18AM +0200, Maud Spierings via B4 Relay wrote:
> From: Maud Spierings <maudspierings@...ontroll.com>
>
> The Maxim MAX25014 is a 4-channel automotive grade backlight driver IC
> with integrated boost controller.
>
> Signed-off-by: Maud Spierings <maudspierings@...ontroll.com>
> ---
>  .../bindings/leds/backlight/maxim,max25014.yaml    | 81 ++++++++++++++++++++++
>  MAINTAINERS                                        |  5 ++
>  2 files changed, 86 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..e113a2ad16aa74f982b9c2ea80578aed2d9424fe
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/backlight/maxim,max25014.yaml
> @@ -0,0 +1,81 @@
> +# 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. This controls the current scale of the
> +      outputs, a higher number means more current.

Use standard unit. Do not use register value directly.

> +
> +  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

led should have standard interface.

check  Documentation/devicetree/bindings/leds/common.yaml

Frank

> +
> +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@6f {
> +            compatible = "maxim,max25014";
> +            reg = <0x6f>;
> +            default-brightness = <50>;
> +            enable-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
> +            interrupt-parent = <&gpio1>;
> +            interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
> +            power-supply = <&reg_backlight>;
> +            pwms = <&pwm1>;
> +            maxim,iset = <7>;
> +            maxim,strings = <1 1 1 1>;
> +        };
> +    };
> +
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 7b7396ed28a700a2aab318553ce8ba1788312bff..5a592eefbe7562734aada05ab9e3aea8cee010e7 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -15069,6 +15069,11 @@ 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
>
> --
> 2.51.0
>
>