linux-kernel - Re: [RFC v2 0/4] Introduce i3c device userspace interface

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Message-ID: <20200217155141.08e87b3f@collabora.com>
Date:   Mon, 17 Feb 2020 15:51:41 +0100
From:   Boris Brezillon <boris.brezillon@...labora.com>
To:     Vitor Soares <Vitor.Soares@...opsys.com>
Cc:     linux-kernel@...r.kernel.org, linux-i3c@...ts.infradead.org,
        Jose.Abreu@...opsys.com, Joao.Pinto@...opsys.com, arnd@...db.de,
        wsa@...-dreams.de, gregkh@...uxfoundation.org,
        bbrezillon@...nel.org, broonie@...nel.org
Subject: Re: [RFC v2 0/4] Introduce i3c device userspace interface

Hello Vitor,

Sorry for taking so long to reply, and thanks for working on that topic.

On Wed, 29 Jan 2020 13:17:31 +0100
Vitor Soares <Vitor.Soares@...opsys.com> wrote:

> For today there is no way to use i3c devices from user space and
> the introduction of such API will help developers during the i3c device
> or i3c host controllers development.
> 
> The i3cdev module is highly based on i2c-dev and yet I tried to address
> the concerns raised in [1].
> 
> NOTES:
> - The i3cdev dynamically request an unused major number.
> 
> - The i3c devices are dynamically exposed/removed from dev/ folder based
>   on if they have a device driver bound to it.

May I ask why you need to automatically bind devices to the i3cdev
driver when they don't have a driver matching the device id
loaded/compiled-in? If we get the i3c subsystem to generate proper
uevents we should be able to load the i3cdev module and bind the device
to this driver using a udev rule.

Regards,

Boris