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15.20.2729.032; Mon, 17 Feb 2020 15:32:55 +0000 From: Vitor Soares To: Boris Brezillon CC: "linux-kernel@vger.kernel.org" , "linux-i3c@lists.infradead.org" , Jose Abreu , Joao Pinto , "arnd@arndb.de" , "wsa@the-dreams.de" , "gregkh@linuxfoundation.org" , "bbrezillon@kernel.org" , "broonie@kernel.org" Subject: RE: [RFC v2 0/4] Introduce i3c device userspace interface Thread-Topic: [RFC v2 0/4] Introduce i3c device userspace interface Thread-Index: AQHV1p4wiafUt0giokeVAyQbyadp7qgflkqAgAABWkA= Date: Mon, 17 Feb 2020 15:32:55 +0000 Message-ID: References: <20200217155141.08e87b3f@collabora.com> In-Reply-To: <20200217155141.08e87b3f@collabora.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-dg-ref: =?us-ascii?Q?PG1ldGE+PGF0IG5tPSJib2R5LnR4dCIgcD0iYzpcdXNlcnNcc29hcmVzXGFw?= =?us-ascii?Q?cGRhdGFccm9hbWluZ1wwOWQ4NDliNi0zMmQzLTRhNDAtODVlZS02Yjg0YmEy?= =?us-ascii?Q?OWUzNWJcbXNnc1xtc2ctYzI3NWU1MTktNTE5YS0xMWVhLTgyOGQtYjgwOGNm?= 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X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: c33c9f88-1eb7-4099-9700-16013fd9e8aa X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: PfOGNLmzncySuwTpbE3TpxyyUbBGCmXo8cON6jmdbKZptseAPJbATxhiXV9dj4sxTXKRASEMKo1BRJA4euGkUQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB3813 X-OriginatorOrg: synopsys.com Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Boris, From: Boris Brezillon Date: Mon, Feb 17, 2020 at 14:51:41 > Hello Vitor, >=20 > Sorry for taking so long to reply, and thanks for working on that topic. >=20 > On Wed, 29 Jan 2020 13:17:31 +0100 > Vitor Soares wrote: >=20 > > 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. > >=20 > > The i3cdev module is highly based on i2c-dev and yet I tried to address > > the concerns raised in [1]. > >=20 > > NOTES: > > - The i3cdev dynamically request an unused major number. > >=20 > > - The i3c devices are dynamically exposed/removed from dev/ folder base= d > > on if they have a device driver bound to it. >=20 > 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. My idea was to expose every device to user-space by default so we can=20 test them without a driver (more or less the i2c use case) but as we=20 agreed during the i3c subsystem only expose devices that doesn't have=20 device driver. I considered to have a uevent but to expose the devices by default it=20 would required something generic, what I didn't figure out and tend to=20 follow the i2c-dev module. With this current approach even if a device has a driver we can unbind it=20 through the Sysfs and have access from user space which I found useful=20 for debug. >=20 > Regards, >=20 > Boris