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Message-ID: <aOfM7jnlPO77YSu1@lizhi-Precision-Tower-5810>
Date: Thu, 9 Oct 2025 10:55:42 -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>,
Liam Girdwood <lgirdwood@...il.com>,
Mark Brown <broonie@...nel.org>, 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 v4 1/4] dt-bindings: backlight: Add max25014 bindings
On Thu, Oct 09, 2025 at 08:48:25AM +0200, Maud Spierings via B4 Relay wrote:
> From: Maud Spierings <maudspierings@...ontroll.com>
Subject needn't double bindings.
dt-bindings: backlight: Add max25014 support
>
> The Maxim MAX25014 is a 4-channel automotive grade backlight driver IC
> with integrated boost controller.
>
> In the current implementation the control registers for channel 1,
> control all channels. So only one led subnode with led-sources is
> supported right now. If at some point the driver functionality is
> expanded the bindings can be easily extended with it.
Need descript hardware, not driver. Need descript full functions even though
driver have not implement yet.
>
> Signed-off-by: Maud Spierings <maudspierings@...ontroll.com>
> ---
> .../bindings/leds/backlight/maxim,max25014.yaml | 109 +++++++++++++++++++++
> MAINTAINERS | 5 +
> 2 files changed, 114 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 0000000000000..496520e1374e5
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/leds/backlight/maxim,max25014.yaml
> @@ -0,0 +1,109 @@
> +# 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>
> +
> +properties:
> + compatible:
> + enum:
> + - maxim,max25014
> +
> + reg:
> + maxItems: 1
> +
> + "#address-cells":
> + const: 1
> +
> + "#size-cells":
> + const: 0
> +
> + enable-gpios:
> + maxItems: 1
> +
> + interrupts:
> + maxItems: 1
> +
> + power-supply:
> + description: Regulator which controls the boost converter input rail.
> +
> + pwms:
> + maxItems: 1
> +
> + maxim,iset:
> + $ref: /schemas/types.yaml#/definitions/uint32
> + maximum: 15
> + default: 11
> + description:
> + Value of the ISET register field. This controls the current scale of the
> + outputs, a higher number means more current.
Can't use register value directly, need use standard unit. or percentage
100: means max, 0: min.
> +
> +patternProperties:
> + "^led@[01]$":
> + type: object
> + description: Properties for a string of connected LEDs.
> + $ref: common.yaml#
> +
> + properties:
> + reg:
> + const: 0
> +
> + led-sources:
> + allOf:
> + - minItems: 1
> + maxItems: 4
> + items:
> + minimum: 0
> + maximum: 3
> + default: [0, 1, 2, 3]
> +
> + default-brightness:
> + minimum: 0
> + maximum: 100
> + default: 50
> +
> + required:
> + - reg
> +
> + additionalProperties: false
there are $ref, should use unevaluatedProperties: false
Frank
> +
> +required:
> + - compatible
> + - reg
> +
> +additionalProperties: 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>;
> + enable-gpios = <&gpio1 4 GPIO_ACTIVE_HIGH>;
> + interrupt-parent = <&gpio1>;
> + interrupts = <2 IRQ_TYPE_EDGE_FALLING>;
> + power-supply = <®_backlight>;
> + pwms = <&pwm1>;
> + maxim,iset = <7>;
> +
> + #address-cells = <1>;
> + #size-cells = <0>;
> +
> + led@0 {
> + reg = <0>;
> + led-sources = <0 1 2 3>;
> + default-brightness = <50>;
> + };
> + };
> + };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 47fbc5e06808f..be5e2515900ce 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -15171,6 +15171,11 @@ 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
>
>
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