linux-kernel - Re: [PATCH 4/5] Documentation: bindings/mfd: sensehat: Raspberry Pi Sense HAT device tree binding

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Message-ID: <YYE0YTXdXd4ude5p@robh.at.kernel.org>
Date:   Tue, 2 Nov 2021 07:51:45 -0500
From:   Rob Herring <robh@...nel.org>
To:     Charles Mirabile <cmirabil@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Lee Jones <lee.jones@...aro.org>,
        devicetree@...r.kernel.org,
        Serge Schneider <serge@...pberrypi.org>,
        Stefan Wahren <stefan.wahren@...e.com>,
        Nicolas Saenz Julienne <nsaenzju@...hat.com>,
        linux-rpi-kernel@...ts.infradead.org, fedora-rpi@...glegroups.com,
        Mwesigwa Guma <mguma@...hat.com>,
        Joel Savitz <jsavitz@...hat.com>
Subject: Re: [PATCH 4/5] Documentation: bindings/mfd: sensehat: Raspberry Pi
 Sense HAT device tree binding

On Fri, Oct 29, 2021 at 05:55:15PM -0400, Charles Mirabile wrote:
> This patch adds the device tree binding
> for the Sense HAT in yaml form.

For the subject, follow the format of the subsystem (run git log 
--oneline) and no need to say 'binding' multiple times:

dt-bindings: mfd: Add Raspberry Pi Sense HAT schema

> 
> Signed-off-by: Charles Mirabile <cmirabil@...hat.com>
> Signed-off-by: Mwesigwa Guma <mguma@...hat.com>
> Signed-off-by: Joel Savitz <jsavitz@...hat.com>
> ---
>  .../bindings/mfd/raspberrypi,sensehat.yaml    | 50 +++++++++++++++++++
>  1 file changed, 50 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/mfd/raspberrypi,sensehat.yaml
> 
> diff --git a/Documentation/devicetree/bindings/mfd/raspberrypi,sensehat.yaml b/Documentation/devicetree/bindings/mfd/raspberrypi,sensehat.yaml
> new file mode 100644
> index 000000000000..e00cd02a3752
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/mfd/raspberrypi,sensehat.yaml
> @@ -0,0 +1,51 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +$id: http://devicetree.org/schemas/mfd/raspberrypi,sensehat.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Raspberry Pi Sensehat
> +
> +maintainers:
> +  - Charles Mirabile <cmirabil@...hat.com>
> +  - Mwesigwa Guma <mguma@...hat.com>
> +  - Joel Savitz <jsavitz@...hat.com>
> +
> +description: |

'|' is not needed if there is no formatting to preserve.

> +  The Raspberry Pi Sensehat is an addon board originally developed
> +  for the Raspberry Pi that has a joystick and an 8x8 RGB LED display
> +  as well as several environmental sensors. It connects via i2c and
> +  a gpio for irq.
> +
> +properties:
> +  compatible:
> +    oneOf:
> +      - enum:

Don't need oneOf when there is only one entry.

> +        - raspberrypi,sensehat
> +        - rpi,rpisense

'rpi' is not a vendor prefix.

What's the fallback for anyways?

> +
> +  reg:
> +    items:
> +      - description: i2c bus address
> +
> +  keys-int-gpios:
> +    items:
> +      - description: gpio pin for joystick interrupt

For an interrupt, use 'interrupts'.

> +
> +required:
> +  - compatible
> +  - reg
> +  - keys-int-gpios
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +    i2c {
> +      #address-cells = <1>;
> +      #size-cells = <0>;
> +      sensehat@46 {
> +        compatible = "raspberrypi,sensehat";
> +        reg = <0x46>;
> +        keys-int-gpios = <&gpio 23 GPIO_ACTIVE_HIGH>;
> +      };
> +    };
> -- 
> 2.31.1
> 
>