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

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Message-ID: <CAL_Jsq+6ruu23UrwJ=NUUrh-9R_E5tKREv1AyU24op_uUigpNg@mail.gmail.com>
Date: Wed, 4 Sep 2024 09:46:20 -0500
From: Rob Herring <robh@...nel.org>
To: Ayush Singh <ayush@...gleboard.org>
Cc: Michael Walle <mwalle@...nel.org>, Mark Brown <broonie@...nel.org>, 
	Vaishnav M A <vaishnav@...gleboard.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, 
	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

On Sat, Aug 31, 2024 at 1:11 PM Ayush Singh <ayush@...gleboard.org> wrote:
>
> >> But here you can have subnodes, no? These could then be just
> >> enumerated as usual.
> >>
> >> &mikrobus_board {
> >>      mikrobus_gpio: gpio {
> >>              gpio-controller;
> >>              #gpio-cells = <1>;
> >>      };
> >>
> >>      spi {
> >>              cs-gpios = <&mikrobus_gpio 1>;
> >>
> >>              spi@0 {
> >>                      compatible = "mydevice";
> >>                      reg = <0>;
> >>              };
> >>      };
> >> };
> >>
>
> Hi, I am now working on an approach for mikroBUS based on the apprach
> described here: [1]
>
>
> I am thinking of the gpio-controller approach you seem to have used
> here. So I wanted to inquire if there already exists a gpio-controller
> driver that can create a proxy controller that forwards stuff to the
> underlying actual controller.

gpio-map is what you are looking for. It's documented in the DT spec.
It was created exactly for this purpose of remapping GPIO lines on a
connector.

Rob