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Message-ID: <20200915005034.GA593718@bogus>
Date:   Mon, 14 Sep 2020 18:50:34 -0600
From:   Rob Herring <robh@...nel.org>
To:     Jonathan Neuschäfer <j.neuschaefer@....net>
Cc:     linux-kernel@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Uwe Kleine-König 
        <u.kleine-koenig@...gutronix.de>,
        Alessandro Zummo <a.zummo@...ertech.it>,
        Alexandre Belloni <alexandre.belloni@...tlin.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Pengutronix Kernel Team <kernel@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        NXP Linux Team <linux-imx@....com>,
        Sam Ravnborg <sam@...nborg.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Heiko Stuebner <heiko.stuebner@...obroma-systems.com>,
        Stephan Gerhold <stephan@...hold.net>,
        Lubomir Rintel <lkundrak@...sk>,
        Mark Brown <broonie@...nel.org>, allen <allen.chen@....com.tw>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org, linux-pwm@...r.kernel.org,
        linux-rtc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Heiko Stuebner <heiko@...ech.de>,
        Josua Mayer <josua.mayer@....eu>,
        Andreas Kemnade <andreas@...nade.info>,
        Arnd Bergmann <arnd@...db.de>, Daniel Palmer <daniel@...f.com>
Subject: Re: [PATCH v2 02/10] dt-bindings: mfd: Add binding for Netronix's
 embedded controller

On Sat, Sep 05, 2020 at 03:32:22PM +0200, Jonathan Neuschäfer wrote:
> This EC is found in e-book readers of multiple brands (e.g. Kobo,
> Tolino), and is typically implemented as a TI MSP430 microcontroller.
> 
> It controls different functions of the system, such as power on/off,
> RTC, PWM for the backlight. The exact functionality provided can vary
> between boards.
> 
> Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@....net>
> ---
> v2:
> - Add the plaintext DT binding for comparison
> 
> 
> For reference, here is the binding in text form:
> 
>   Netronix Embedded Controller
> 
>   This EC is found in e-book readers of multiple brands (e.g. Kobo, Tolino), and
>   is typically implemented as a TI MSP430 microcontroller.
> 
> 
>   Required properties:
>   - compatible: should be "netronix,ntxec"
>   - reg: The I2C address of the EC
> 
>   Optional properties:
>   - system-power-controller:
>     See Documentation/devicetree/bindings/power/power-controller.txt
>   - interrupts or interrupts-extended
>   - interrupt-controller
>   - #interrupt-cells: Should be 1
> 
>   Optional subnodes:
> 
>   Sub-nodes are identified by their compatible string.
> 
>    compatible string              | description
>   --------------------------------|--------------------------------------
>    netronix,ntxec-pwm             | PWM (used for backlight)
>    netronix,ntxec-rtc             | real time clock
> 
> 
>   Example:
> 
>   &i2c3 {
>   	pinctrl-names = "default";
>   	pinctrl-0 = <&pinctrl_i2c3>;
>   	status = "okay";
> 
>   	ec: embedded-controller@43 {
>   		pinctrl-names = "default";
>   		pinctrl-0 = <&pinctrl_ntxec>;
> 
>   		compatible = "netronix,ntxec";
>   		reg = <0x43>;
>   		system-power-controller;
>   		interrupt-parent = <&gpio4>;
>   		interrupts = <11 IRQ_TYPE_EDGE_FALLING>;
>   		interrupt-controller;
>   		#interrupt-cells = <1>;
> 
>   		pwm {
>   			compatible = "netronix,ntxec-pwm";
>   			#pwm-cells = <2>;
>   		};
> 
>   		rtc {
>   			compatible = "netronix,ntxec-rtc";
>   			interrupts-extended = <&ec 15>;
>   			interrupt-names = "alarm";
>   		};
>   	};
>   };
> ---
>  .../bindings/mfd/netronix,ntxec.yaml          | 57 +++++++++++++++++++
>  1 file changed, 57 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml b/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
> new file mode 100644
> index 0000000000000..596df460f98eb
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/netronix,ntxec.yaml
> @@ -0,0 +1,57 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/mfd/netronix,ntxec.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Netronix Embedded Controller
> +
> +maintainers:
> +  - Jonathan Neuschäfer <j.neuschaefer@....net>
> +
> +description: |
> +  This EC is found in e-book readers of multiple brands (e.g. Kobo, Tolino), and
> +  is typically implemented as a TI MSP430 microcontroller.
> +
> +
> +properties:
> +  compatible:
> +    const: netronix,ntxec
> +
> +  reg:
> +    items:
> +      - description: The I2C address of the EC
> +
> +  system-power-controller:
> +    type: boolean
> +    description: See Documentation/devicetree/bindings/power/power-controller.txt
> +
> +  interrupts:
> +    minItems: 1
> +    description:
> +      The EC can signal interrupts via a GPIO line
> +
> +required:
> +  - compatible
> +  - reg

additionalProperties: false

> +
> +examples:
> +  - |
> +    #include <dt-bindings/interrupt-controller/irq.h>
> +    i2c {
> +            #address-cells = <1>;
> +            #size-cells = <0>;
> +
> +            ec: embedded-controller@43 {
> +                    pinctrl-names = "default";
> +                    pinctrl-0 = <&pinctrl_ntxec>;
> +
> +                    compatible = "netronix,ntxec";
> +                    reg = <0x43>;
> +                    system-power-controller;
> +                    interrupt-parent = <&gpio4>;
> +                    interrupts = <11 IRQ_TYPE_EDGE_FALLING>;

> +                    interrupt-controller;
> +                    #interrupt-cells = <1>;

These need to be documented too.

> +            };
> +    };
> --
> 2.28.0
> 

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