linux-kernel - Re: [PATCH v2 1/5] regulator: dt-bindings: Add Linear Technology LTM8054 regulator

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Message-ID: <20250925-pushchair-charity-9ccee20d8a6e@spud>
Date: Thu, 25 Sep 2025 20:27:06 +0100
From: Conor Dooley <conor@...nel.org>
To: Romain Gantois <romain.gantois@...tlin.com>
Cc: Liam Girdwood <lgirdwood@...il.com>, Mark Brown <broonie@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Jonathan Cameron <jic23@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Nuno Sá <nuno.sa@...log.com>,
	Andy Shevchenko <andy@...nel.org>, Hans de Goede <hansg@...nel.org>,
	Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	linux-iio@...r.kernel.org
Subject: Re: [PATCH v2 1/5] regulator: dt-bindings: Add Linear Technology
 LTM8054 regulator

On Thu, Sep 25, 2025 at 02:37:33PM +0200, Romain Gantois wrote:
> The Linear Technology LTM8054 is a Buck-Boost voltage regulator with an
> input range of 5V to 36V and an output range of 1.2V to 36V.
> 
> The LTM8054's output voltage level is typically set using a voltage divider
> between the Vout and FB pins, the FB pin being constantly regulated to
> 1.2V.
> 
> The output current limit of the LTM8054 may be statically set by placing a
> sense resistor on a dedicated pin. This limit can then be lowered by
> controlling the voltage level on the CTL pin.
> 
> Describe the LTM8054 voltage regulator.
> 
> Signed-off-by: Romain Gantois <romain.gantois@...tlin.com>
> ---
>  .../devicetree/bindings/regulator/adi,ltm8054.yaml | 73 ++++++++++++++++++++++
>  MAINTAINERS                                        |  5 ++
>  2 files changed, 78 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/regulator/adi,ltm8054.yaml b/Documentation/devicetree/bindings/regulator/adi,ltm8054.yaml
> new file mode 100644
> index 0000000000000000000000000000000000000000..8ca8fc4e80b5722f58b4cbe9de22c16d4fd91670
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/regulator/adi,ltm8054.yaml
> @@ -0,0 +1,73 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/regulator/adi,ltm8054.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Analog Devices LTM8054 buck-boost regulator
> +
> +maintainers:
> +  - Romain Gantois <romain.gantois@...tlin.com>
> +
> +description:
> +  This regulator operates over an input voltage range of 5V to 36V, and can
> +  output from 1.2V to 36V. The output voltage level is typically set with a
> +  voltage divider between the Vout pin and the FB pin which is internally
> +  regulated to 1.2V.
> +
> +  The output current of the LTM8054 can be limited by tying the Iout pin to a
> +  current sense resistor. This limit can be further lowered by applying a
> +  voltage below 1.2V to the CTL pin.
> +
> +allOf:
> +  - $ref: /schemas/regulator/regulator.yaml#
> +
> +properties:
> +  compatible:
> +    const: adi,ltm8054
> +
> +  enable-gpios:
> +    description: GPIO connected to the RUN pin.
> +    maxItems: 1
> +
> +  lltc,fb-voltage-divider:

Why does this property have a ?linear? vendor prefix?
Shouldn't it be adi to match the other property and compatible?

> +    description:
> +      An array of two integers containing the resistor values
> +      R1 and R2 of the feedback voltage divider in Ohms.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    minItems: 2
> +    maxItems: 2
> +
> +  adi,iout-rsense-micro-ohms:
> +    description:
> +      Value of the output current sense resistor, in micro Ohms.
> +
> +  io-channels:
> +    items:
> +      - description: DAC controlling the voltage level of the CTL pin.
> +
> +  io-channel-names:
> +    items:
> +      - const: ctl
> +
> +required:
> +  - compatible
> +  - lltc,fb-voltage-divider
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    regulator {
> +        compatible = "adi,ltm8054";
> +
> +        enable-gpios = <&gpio0 1 GPIO_ACTIVE_HIGH>;
> +
> +        lltc,fb-voltage-divider = <1000000 68000>;
> +
> +        adi,iout-rsense-micro-ohms = <20000>;
> +
> +        io-channels = <&dac 1>;
> +        io-channel-names = "ctl";
> +    };
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 3763f9fc9e4ed62bc8b273756a25f9c921570bee..69bcba82808bb815af436232fab50f70713fd533 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -14534,6 +14534,11 @@ W:	https://ez.analog.com/linux-software-drivers
>  F:	Documentation/devicetree/bindings/i2c/i2c-mux-ltc4306.txt
>  F:	drivers/i2c/muxes/i2c-mux-ltc4306.c
>  
> +LTM8054 REGULATOR DRIVER
> +M:	Romain Gantois <romain.gantois@...tlin.com>
> +S:	Maintained
> +F:	Documentation/devicetree/bindings/regulator/adi,ltm8054.yaml
> +
>  LTP (Linux Test Project)
>  M:	Andrea Cervesato <andrea.cervesato@...e.com>
>  M:	Cyril Hrubis <chrubis@...e.cz>
> 
> -- 
> 2.51.0
> 

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