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Date:   Mon, 14 Sep 2020 12:12:57 -0600
From:   Rob Herring <robh@kernel.org>
To:     Krzysztof Kozlowski <krzk@kernel.org>
Cc:     Linus Walleij <linus.walleij@linaro.org>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        =?iso-8859-1?Q?Beno=EEt?= Cousson <bcousson@baylibre.com>,
        Tony Lindgren <tony@atomide.com>,
        Joel Stanley <joel@jms.id.au>,
        Andrew Jeffery <andrew@aj.id.au>,
        Jason Cooper <jason@lakedaemon.net>,
        Andrew Lunn <andrew@lunn.ch>,
        Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com>,
        Gregory Clement <gregory.clement@bootlin.com>,
        Shawn Guo <shawnguo@kernel.org>,
        Sascha Hauer <s.hauer@pengutronix.de>,
        Pengutronix Kernel Team <kernel@pengutronix.de>,
        Stefan Agner <stefan@agner.ch>, linux-gpio@vger.kernel.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-aspeed@lists.ozlabs.org
Subject: Re: [PATCH 2/6] dt-bindings: gpio: Convert bindings for Maxim
 MAX732x family to dtschema
Message-ID: <20200914181257.GA4163345@bogus>
References: <20200829094024.31842-1-krzk@kernel.org>
 <20200829094024.31842-2-krzk@kernel.org>
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On Sat, Aug 29, 2020 at 11:40:20AM +0200, Krzysztof Kozlowski wrote:
> Convert the Maxim MAX732x family of GPIO expanders bindings to device
> tree schema by merging it with existing PCA95xx schema.  These are quite
> similar so merging reduces duplication.
> 
> Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
> ---
>  .../devicetree/bindings/gpio/gpio-max732x.txt | 58 ---------------
>  .../bindings/gpio/gpio-pca95xx.yaml           | 72 ++++++++++++++++++-
>  2 files changed, 70 insertions(+), 60 deletions(-)
>  delete mode 100644 Documentation/devicetree/bindings/gpio/gpio-max732x.txt
> 
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-max732x.txt b/Documentation/devicetree/bindings/gpio/gpio-max732x.txt
> deleted file mode 100644
> index b3a9c0c32823..000000000000
> --- a/Documentation/devicetree/bindings/gpio/gpio-max732x.txt
> +++ /dev/null
> @@ -1,58 +0,0 @@
> -* MAX732x-compatible I/O expanders
> -
> -Required properties:
> -  - compatible: Should be one of the following:
> -    - "maxim,max7319": For the Maxim MAX7319
> -    - "maxim,max7320": For the Maxim MAX7320
> -    - "maxim,max7321": For the Maxim MAX7321
> -    - "maxim,max7322": For the Maxim MAX7322
> -    - "maxim,max7323": For the Maxim MAX7323
> -    - "maxim,max7324": For the Maxim MAX7324
> -    - "maxim,max7325": For the Maxim MAX7325
> -    - "maxim,max7326": For the Maxim MAX7326
> -    - "maxim,max7327": For the Maxim MAX7327
> -  - reg: I2C slave address for this device.
> -  - gpio-controller: Marks the device node as a GPIO controller.
> -  - #gpio-cells: Should be 2.
> -    - first cell is the GPIO number
> -    - second cell specifies GPIO flags, as defined in <dt-bindings/gpio/gpio.h>.
> -      Only the GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW flags are supported.
> -
> -Optional properties:
> -
> -  The I/O expander can detect input state changes, and thus optionally act as
> -  an interrupt controller. When the expander interrupt line is connected all the
> -  following properties must be set. For more information please see the
> -  interrupt controller device tree bindings documentation available at
> -  Documentation/devicetree/bindings/interrupt-controller/interrupts.txt.
> -
> -  - interrupt-controller: Identifies the node as an interrupt controller.
> -  - #interrupt-cells: Number of cells to encode an interrupt source, shall be 2.
> -    - first cell is the pin number
> -    - second cell is used to specify flags
> -  - interrupts: Interrupt specifier for the controllers interrupt.
> -
> -Please refer to gpio.txt in this directory for details of the common GPIO
> -bindings used by client devices.
> -
> -Example 1. MAX7325 with interrupt support enabled (CONFIG_GPIO_MAX732X_IRQ=y):
> -
> -	expander: max7325@6d {
> -		compatible = "maxim,max7325";
> -		reg = <0x6d>;
> -		gpio-controller;
> -		#gpio-cells = <2>;
> -		interrupt-controller;
> -		#interrupt-cells = <2>;
> -		interrupt-parent = <&gpio4>;
> -		interrupts = <29 IRQ_TYPE_EDGE_FALLING>;
> -	};
> -
> -Example 2. MAX7325 with interrupt support disabled (CONFIG_GPIO_MAX732X_IRQ=n):
> -
> -	expander: max7325@6d {
> -		compatible = "maxim,max7325";
> -		reg = <0x6d>;
> -		gpio-controller;
> -		#gpio-cells = <2>;
> -	};
> diff --git a/Documentation/devicetree/bindings/gpio/gpio-pca95xx.yaml b/Documentation/devicetree/bindings/gpio/gpio-pca95xx.yaml
> index c5bb24b3b7b5..e90433b7d52b 100644
> --- a/Documentation/devicetree/bindings/gpio/gpio-pca95xx.yaml
> +++ b/Documentation/devicetree/bindings/gpio/gpio-pca95xx.yaml
> @@ -9,6 +9,10 @@ title: NXP PCA95xx I2C GPIO multiplexer
>  maintainers:
>    - Krzysztof Kozlowski <krzk@kernel.org>
>  
> +description: |+
> +  Bindings for the family of I2C GPIO multiplexers/expanders: NXP PCA95xx,
> +  Maxim MAX73xx
> +
>  properties:
>    compatible:
>      enum:
> @@ -17,6 +21,15 @@ properties:
>        - maxim,max7312
>        - maxim,max7313
>        - maxim,max7315
> +      - maxim,max7319
> +      - maxim,max7320
> +      - maxim,max7321
> +      - maxim,max7322
> +      - maxim,max7323
> +      - maxim,max7324
> +      - maxim,max7325
> +      - maxim,max7326
> +      - maxim,max7327
>        - nxp,pca6416
>        - nxp,pca9505
>        - nxp,pca9534
> @@ -69,11 +82,11 @@ properties:
>    reset-gpios:
>      description:
>        GPIO specification for the RESET input. This is an active low signal to
> -      the PCA953x.
> +      the PCA953x.  Not valid for Maxim MAX732x devices.
>  
>    vcc-supply:
>      description:
> -      Optional power supply
> +      Optional power supply.  Not valid for Maxim MAX732x devices.
>  
>  required:
>    - compatible
> @@ -83,6 +96,27 @@ required:
>  
>  unevaluatedProperties: false
>  
> +allOf:
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - maxim,max7320
> +              - maxim,max7321
> +              - maxim,max7322
> +              - maxim,max7323
> +              - maxim,max7324
> +              - maxim,max7325
> +              - maxim,max7326
> +              - maxim,max7327
> +    then:
> +      properties:
> +        reset-gpios:
> +          maxItems: 0
> +        vcc-supply:
> +          maxItems: 0

reset-gpios: false
vcc-supply: false

> +
>  examples:
>    - |
>      #include <dt-bindings/interrupt-controller/irq.h>
> @@ -136,3 +170,37 @@ examples:
>              ti,micbias = <0>;	/* 2.1V */
>          };
>      };
> +
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +
> +    i2c2 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        // MAX7325 with interrupt support enabled
> +        gpio@6d {
> +            compatible = "maxim,max7325";
> +            reg = <0x6d>;
> +            gpio-controller;
> +            #gpio-cells = <2>;
> +            interrupt-controller;
> +            #interrupt-cells = <2>;
> +            interrupt-parent = <&gpio4>;
> +            interrupts = <29 IRQ_TYPE_EDGE_FALLING>;
> +        };
> +    };
> +
> +  - |
> +    i2c3 {
> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        // MAX7325 with interrupt support disabled
> +        gpio@6e {
> +            compatible = "maxim,max7325";
> +            reg = <0x6e>;
> +            gpio-controller;
> +            #gpio-cells = <2>;
> +        };
> +    };
> -- 
> 2.17.1
>