linux-kernel - Re: [PATCH v5 1/7] dt-bindings: connector: Add mikrobus-connector

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Date: Thu, 27 Jun 2024 19:12:52 +0200
From: "Michael Walle" <mwalle@...nel.org>
To: "Ayush Singh" <ayush@...gleboard.org>, "Mark Brown"
 <broonie@...nel.org>, "Vaishnav M A" <vaishnav@...gleboard.org>, "Rob
 Herring" <robh@...nel.org>, "Krzysztof Kozlowski" <krzk+dt@...nel.org>,
 "Conor Dooley" <conor+dt@...nel.org>, "Derek Kiernan"
 <derek.kiernan@....com>, "Dragan Cvetic" <dragan.cvetic@....com>, "Arnd
 Bergmann" <arnd@...db.de>, "Greg Kroah-Hartman"
 <gregkh@...uxfoundation.org>, "Nishanth Menon" <nm@...com>, "Vignesh
 Raghavendra" <vigneshr@...com>, "Tero Kristo" <kristo@...nel.org>, "Andrew
 Lunn" <andrew@...n.ch>, <jkridner@...gleboard.org>,
 <robertcnelson@...gleboard.org>
Cc: <linux-spi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
 <devicetree@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v5 1/7] dt-bindings: connector: Add mikrobus-connector

Hi,

Could you give us a DT snippet of how this should look like with a
board?

On Thu Jun 27, 2024 at 6:26 PM CEST, Ayush Singh wrote:
> +  board:
> +    description: board attached to mikrobus connector
> +    $ref: /schemas/types.yaml#/definitions/phandle-array

Shouldn't this be a subnode of the connector?

i.e.

connector {
	compatible = "mikrobus-connector";

	// phandles to the parent controllers

	spi {
		temp-sensor@0 {
			compatible = "maxim,max31855k";
			reg = <0>;
		};
	};

	i2c {
		..
	};
};

I don't think you can introduce a new
  compatible = "maxim,max31855k", "mikrobus,spi";
if there is already a binding for "maxim,max31855k". But I might be
wrong. Why is this compatible needed at all?

Also, the mikrobus-connector driver could translate the chipselects.

-michael