linux-kernel - Re: [PATCH v5 01/11] dt-bindings: mfd: gpio: Add MAX7360

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Message-Id: <D8UBKT8USZ4U.1OOL1IJMPECFE@bootlin.com>
Date: Mon, 31 Mar 2025 10:47:59 +0200
From: "Mathieu Dubois-Briand" <mathieu.dubois-briand@...tlin.com>
To: "Mathieu Dubois-Briand" <mathieu.dubois-briand@...tlin.com>, "Lee Jones"
 <lee@...nel.org>, "Rob Herring" <robh@...nel.org>, "Krzysztof Kozlowski"
 <krzk+dt@...nel.org>, "Conor Dooley" <conor+dt@...nel.org>, "Kamel Bouhara"
 <kamel.bouhara@...tlin.com>, "Linus Walleij" <linus.walleij@...aro.org>,
 "Bartosz Golaszewski" <brgl@...ev.pl>, "Dmitry Torokhov"
 <dmitry.torokhov@...il.com>, Uwe Kleine-König
 <ukleinek@...nel.org>, "Michael Walle" <mwalle@...nel.org>, "Mark Brown"
 <broonie@...nel.org>, "Greg Kroah-Hartman" <gregkh@...uxfoundation.org>,
 "Rafael J. Wysocki" <rafael@...nel.org>, "Danilo Krummrich"
 <dakr@...nel.org>
Cc: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
 <linux-gpio@...r.kernel.org>, <linux-input@...r.kernel.org>,
 <linux-pwm@...r.kernel.org>, <andriy.shevchenko@...el.com>,
 Grégory Clement <gregory.clement@...tlin.com>, "Thomas
 Petazzoni" <thomas.petazzoni@...tlin.com>
Subject: Re: [PATCH v5 01/11] dt-bindings: mfd: gpio: Add MAX7360

On Tue Mar 18, 2025 at 5:26 PM CET, Mathieu Dubois-Briand wrote:
> Add device tree bindings for Maxim Integrated MAX7360 device with
> support for keypad, rotary, gpios and pwm functionalities.
>
> Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@...tlin.com>
> ---

Hi,

Following discussion we had under the PWM patch of this series, we might
need to refactor a bit the device tree binding architecture, adding two
new subnodes, one for pinctrl and one for PWM.

This will need create two new compatible values with associated bindings
and modify a bit the properties of the maxim,max7360.yaml binding.

Here is the example modified to reflect what I have in mind.

> ...
>
> diff --git a/Documentation/devicetree/bindings/mfd/maxim,max7360.yaml b/Documentation/devicetree/bindings/mfd/maxim,max7360.yaml
> new file mode 100644
> index 000000000000..d3c09531dc5c
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/maxim,max7360.yaml
> @@ -0,0 +1,170 @@
>
> ...
>
> +examples:
> +  - |
> +    #include <dt-bindings/input/input.h>
> +    #include <dt-bindings/interrupt-controller/arm-gic.h>
> +
> +    i2c {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +
> +      io-expander@38 {
> +        compatible = "maxim,max7360";
> +        reg = <0x38>;
> +
> +        interrupt-parent = <&gpio1>;
> +        interrupts = <23 IRQ_TYPE_LEVEL_LOW>,
> +                     <24 IRQ_TYPE_LEVEL_LOW>;
> +        interrupt-names = "inti", "intk";
> +
> +        keypad,num-rows = <8>;
> +        keypad,num-columns = <4>;
> +        linux,keymap = <
> +          MATRIX_KEY(0x00, 0x00, KEY_F5)
> +          MATRIX_KEY(0x01, 0x00, KEY_F4)
> +          MATRIX_KEY(0x02, 0x01, KEY_F6)
> +          >;
> +        keypad-debounce-delay-ms = <10>;
> +        autorepeat;
> +
> +        rotary-debounce-delay-ms = <2>;
> +        linux,axis = <0>; /* REL_X */
> +

+ max7360_pwm: pwm {
+         compatible = "maxim,max7360-pwm";

> +        #pwm-cells = <3>;

+ };

> +
> +        max7360_gpio: gpio {
> +          compatible = "maxim,max7360-gpio";
> +
> +          gpio-controller;
> +          #gpio-cells = <2>;
> +          maxim,constant-current-disable = <0x06>;
> +
> +          interrupt-controller;
> +          #interrupt-cells = <0x2>;
> +        };
> +
> +        max7360_gpo: gpo {
> +          compatible = "maxim,max7360-gpo";
> +
> +          gpio-controller;
> +          #gpio-cells = <2>;
> +        };

+ pinctrl {
+         compatible = "maxim,max7360-pinctrl";

> +
> +        backlight_pins: backlight-pins {
> +          pins = "PORT2";
> +          function = "pwm";
> +        };

+ };

> +      };
> +    };

This would allow to assign a device tree node to both the pinctrl and
the PWM devices in the kernel?

Is there any comment regarding this proposal? Without any specific
comment, I will send a new version with these changes in a few days.

Best regards,
Mathieu

-- 
Mathieu Dubois-Briand, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com