linux-kernel - Re: [PATCH v3 1/8] dt-bindings: misc: Add mikrobus-connector

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Message-ID: <20240317205927.GA2178147-robh@kernel.org>
Date: Sun, 17 Mar 2024 15:59:27 -0500
From: Rob Herring <robh@...nel.org>
To: Ayush Singh <ayushdevel1325@...il.com>
Cc: linux-kernel@...r.kernel.org, jkridner@...gleboard.org,
	robertcnelson@...gleboard.org,
	Vaishnav M A <vaishnav@...gleboard.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Nishanth Menon <nm@...com>,
	Vignesh Raghavendra <vigneshr@...com>,
	Tero Kristo <kristo@...nel.org>,
	Derek Kiernan <derek.kiernan@....com>,
	Dragan Cvetic <dragan.cvetic@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>, Jiri Slaby <jirislaby@...nel.org>,
	Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-spi@...r.kernel.org, linux-serial@...r.kernel.org,
	greybus-dev@...ts.linaro.org
Subject: Re: [PATCH v3 1/8] dt-bindings: misc: Add mikrobus-connector

On Sat, Mar 16, 2024 at 12:18:59AM +0530, Ayush Singh wrote:
> Add DT bindings for mikroBUS interface. MikroBUS is an open standard
> developed by MikroElektronika for connecting add-on boards to
> microcontrollers or microprocessors.
> 
> Signed-off-by: Ayush Singh <ayushdevel1325@...il.com>
> ---
>  .../bindings/misc/mikrobus-connector.yaml     | 110 ++++++++++++++++++
>  MAINTAINERS                                   |   6 +
>  2 files changed, 116 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/misc/mikrobus-connector.yaml
> 
> diff --git a/Documentation/devicetree/bindings/misc/mikrobus-connector.yaml b/Documentation/devicetree/bindings/misc/mikrobus-connector.yaml
> new file mode 100644
> index 000000000000..6eace2c0dddc
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/misc/mikrobus-connector.yaml
> @@ -0,0 +1,110 @@
> +# SPDX-License-Identifier: GPL-2.0 OR BSD-2-Clause
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/misc/mikrobus-connector.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: mikroBUS add-on board socket
> +
> +maintainers:
> +  - Ayush Singh <ayushdevel1325@...il.com>
> +
> +properties:
> +  compatible:
> +    const: mikrobus-connector
> +
> +  pinctrl-0: true
> +  pinctrl-1: true
> +  pinctrl-2: true
> +  pinctrl-3: true
> +  pinctrl-4: true
> +  pinctrl-5: true
> +  pinctrl-6: true
> +  pinctrl-7: true
> +  pinctrl-8: true
> +
> +  pinctrl-names:
> +    items:
> +      - const: default
> +      - const: pwm_default
> +      - const: pwm_gpio
> +      - const: uart_default
> +      - const: uart_gpio
> +      - const: i2c_default
> +      - const: i2c_gpio
> +      - const: spi_default
> +      - const: spi_gpio
> +
> +  mikrobus-gpios:
> +    minItems: 11
> +    maxItems: 12

What is each GPIO entry?

> +
> +  i2c-adapter:

We already have i2c-bus and i2c-parent properties. Neither of those work 
for you?

> +    description: i2c adapter attached to the mikrobus socket.
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +
> +  spi-controller:
> +    description: spi bus number of the spi-master attached to the mikrobus socket.
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +
> +  uart:

Nice and consistent. In 3 properties, we have 'adapter', 'controller' 
and <null>...

Also, DT generally uses 'serial' rather than 'uart'.

> +    description: uart port attached to the mikrobus socket
> +    $ref: /schemas/types.yaml#/definitions/phandle
> +
> +  pwms:
> +    description: the pwm-controller corresponding to the mikroBUS PWM pin.
> +    maxItems: 1
> +
> +  spi-cs:
> +    description: spi chip-select numbers corresponding to the chip-selects on the mikrobus socket.
> +    $ref: /schemas/types.yaml#/definitions/uint32-array
> +    items:
> +      - description: chip select corresponding to CS pin
> +      - description: chip select corresponding to RST pin

How would someone handle any of the properties defined in 
spi-peripheral-props.yaml?


Rob