linux-kernel - Re: [PATCH 0/8] Add generic overlay for MikroBUS addon boards

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Message-ID: <8428068.T7Z3S40VBb@steina-w>
Date: Fri, 13 Sep 2024 12:05:05 +0200
From: Alexander Stein <alexander.stein@...tq-group.com>
To: fabien.parent@...aro.org, d-gole@...com, lorforlinux@...gleboard.org, jkridner@...gleboard.org, robertcnelson@...gleboard.org, Andrew Davis <afd@...com>, Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, 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>, Ayush Singh <ayush@...gleboard.org>
Cc: linux-kernel@...r.kernel.org, rust-for-linux@...r.kernel.org, devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, Ayush Singh <ayush@...gleboard.org>
Subject: Re: [PATCH 0/8] Add generic overlay for MikroBUS addon boards

Hi,

Am Mittwoch, 11. September 2024, 16:27:17 CEST schrieb Ayush Singh:
> Hello all,
> 
> This is an attempt to add MikroBUS addon support using the approach
> described by Grove connector patch series [0].
> 
> The patch series tests out 2 addon boards + pwm and GPIO on the MikroBUS
> connector. The boards used are GPS3 Click (for UART) [1] and Weather
> Click (for I2C) [2]. Additionally, I have tested relative GPIO numbering
> using devicetree nexus nodes [3].
> 
> The patch series does not attempt to do any dynamic discovery for 1-wire
> eeprom MikroBUS addon boards, nor does it provide any sysfs entry for
> board addition/removal. The connector driver might include them after
> the basic support is ironed out, but the existing patches for dynamic
> overlays work fine.
> [sniip]

To put it in a more abstract perspective, aren't you "just" defining some
kind of connector with a fixed layout of pins and features?
It's not really different to Arduino Shields and Raspberry Pi hats, no?
Ignoring multi-purpose pins for GPIO or e.g. I2C, this is about matching
the plugin module's pins to platform-specific on-board peripherals.

Sticking the name to MikroBUS might be misleading, because this is AFAICT
just a trademark for a specific connector pin layout.
This concept could be applied for any kind of connector, where e.g.
the I2C interface is mapped to i2c0 on one platform and to lpi2c5
on a different platform.

Best regards,
Alexander
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