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Date: Mon, 17 Feb 2020 18:37:47 +0100 From: Boris Brezillon <boris.brezillon@...labora.com> To: Vitor Soares <Vitor.Soares@...opsys.com> Cc: Jose.Abreu@...opsys.com, Joao.Pinto@...opsys.com, arnd@...db.de, wsa@...-dreams.de, gregkh@...uxfoundation.org, bbrezillon@...nel.org, linux-kernel@...r.kernel.org, broonie@...nel.org, linux-i3c@...ts.infradead.org Subject: Re: [RFC v2 0/4] Introduce i3c device userspace interface On Mon, 17 Feb 2020 15:51:41 +0100 Boris Brezillon <boris.brezillon@...labora.com> wrote: > 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. Hm, looks like we already send a proper MODALIAS [1], so we can actually implement this auto-bind to i3cdev in udev (fall back on i3cdev load+bind if no matching module is found). [1]https://elixir.bootlin.com/linux/latest/source/drivers/i3c/master.c#L269
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