linux-kernel - Re: [PATCH v4 1/5] dt-bindings: misc: Add mikrobus-connector

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Message-ID: <b62915ca-c151-4e37-bb03-c92c569c84ff@lunn.ch>
Date: Tue, 19 Mar 2024 13:25:41 +0100
From: Andrew Lunn <andrew@...n.ch>
To: Ayush Singh <ayushdevel1325@...il.com>
Cc: Michael Walle <mwalle@...nel.org>,
	open list <linux-kernel@...r.kernel.org>, jkridner@...gleboard.org,
	robertcnelson@...gleboard.org, lorforlinux@...gleboard.org,
	Rob Herring <robh@...nel.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>,
	Vaishnav M A <vaishnav.a@...com>, Mark Brown <broonie@...nel.org>,
	Johan Hovold <johan@...nel.org>, Alex Elder <elder@...nel.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" <devicetree@...r.kernel.org>,
	"moderated list:ARM/TEXAS INSTRUMENTS K3 ARCHITECTURE" <linux-arm-kernel@...ts.infradead.org>,
	"open list:SPI SUBSYSTEM" <linux-spi@...r.kernel.org>,
	"moderated list:GREYBUS SUBSYSTEM" <greybus-dev@...ts.linaro.org>,
	Vaishnav M A <vaishnav@...gleboard.org>
Subject: Re: [PATCH v4 1/5] dt-bindings: misc: Add mikrobus-connector

> The device tree defines the SPI controller associated with mikroBUS SPI
> pins. The driver on match queries and takes a reference to the SPI
> controller but does nothing with it. Once a mikroBUS add-on board is
> detected (by passing manifest using sysfs or reading from 1-wire EEPROM),
> the driver parses the manifest, and if it detects an SPI device in manifest,
> it registers SPI device along with setting properties such as `chip_select`,
> `max_speed_hz`, `mode`, etc.,

How complex can the description of the hardware be in the manifest?

Could i describe an SPI to I2C converter? And then a few temperature
sensors, a fan controller, and a GPIO controller on that I2C bus? And
the GPIO controller is then used for LEDs and a push button? DT
overlays could describe that. Can the manifest?

	Andrew