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mapi id 15.20.2750.021; Mon, 24 Feb 2020 10:53:25 +0000 From: Vitor Soares To: Boris Brezillon CC: "bbrezillon@kernel.org" , Joao Pinto , Jose Abreu , "gregkh@linuxfoundation.org" , "wsa@the-dreams.de" , "arnd@arndb.de" , "broonie@kernel.org" , "corbet@lwn.net" , "linux-kernel@vger.kernel.org" , "linux-i3c@lists.infradead.org" Subject: RE: [PATCH v3 0/5] Introduce i3c device userspace interface Thread-Topic: [PATCH v3 0/5] Introduce i3c device userspace interface Thread-Index: AQHV5rqI90LrTPLnik2TPIdRwWN8OaghqdAQgACCowCAA55iQIAAI/EAgARAQmA= Date: Mon, 24 Feb 2020 10:53:25 +0000 Message-ID: References: <20200219091658.7506e7bd@collabora.com> <20200221184116.1d8f0677@collabora.com> In-Reply-To: <20200221184116.1d8f0677@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?= 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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: 59P9CTTsprVWNRH/0u0xlB3ZpnRnuowEmG0m7XITSU++T2FDZKF7gVM1i3VSfu7+4hBhlXg5ccI8/5CjwhFa6w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB3734 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: Fri, Feb 21, 2020 at 17:41:16 > > > >=20 > > > > I want to make you know that none of your previous comments was ign= ored=20 > > > > and I would like to start the discussion from this point. =20 > > >=20 > > > Sure, np. I'll probably wait for a v4 exploring the option I proposed > > > then. =20 > >=20 > > I would like to check with you: > > - How can we prioritize the device driver over the i3cdev driver if t= he=20 > > driver is loaded after i3cdev? Currently, this is done automatically=20 > > without any command, and for me, this is a requirement. >=20 > No devs would be bound to the i3cdev driver by default, it would have > to be done explicitly through a sysfs knob. Which makes me realize > we can't use the generic bind knob since it doesn't let the subsystem > know that it's a manual bind. I thought there was a way to distinguish > between manual and auto-bind. >=20 > > - For the ioctl command structure, there is no rule about the way I d= id=20 > > or what you proposed, both are currently used in the kernel. For me it = is=20 > > one more structure to deal with, can you point the advantages of your=20 > > purpose? >=20 > I don't have a strong opinion on that one, though I find it a bit > easier to follow when the number of xfers is encoded in a separate > struct rather than extracted from the data size passed through the cmd > argument. I will change it then. Do you have any suggestion for the naming to keep=20 it short? >=20 > > - Regarding the ioctl codes, I tried to use those after I2C. >=20 > Why start from 0x30? It doesn't make sense to me. Just because you base > your code on something that already exists doesn't mean you have to > copy all of it. I might be wrong but last I2C command is 0x20 and I tried to let some=20 free space in case they need. Also I think that make sense I2C and I3C share the same 'magic number'. BTW, in ioctl-numbers documentation there is no reference for code 0x07. 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"broonie@kernel.org" , "linux-i3c@lists.infradead.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-i3c" Errors-To: linux-i3c-bounces+linux-i3c=archiver.kernel.org@lists.infradead.org Hi Boris, From: Boris Brezillon Date: Fri, Feb 21, 2020 at 17:41:16 > > > > > > > > I want to make you know that none of your previous comments was ignored > > > > and I would like to start the discussion from this point. > > > > > > Sure, np. I'll probably wait for a v4 exploring the option I proposed > > > then. > > > > I would like to check with you: > > - How can we prioritize the device driver over the i3cdev driver if the > > driver is loaded after i3cdev? Currently, this is done automatically > > without any command, and for me, this is a requirement. > > No devs would be bound to the i3cdev driver by default, it would have > to be done explicitly through a sysfs knob. Which makes me realize > we can't use the generic bind knob since it doesn't let the subsystem > know that it's a manual bind. I thought there was a way to distinguish > between manual and auto-bind. > > > - For the ioctl command structure, there is no rule about the way I did > > or what you proposed, both are currently used in the kernel. For me it is > > one more structure to deal with, can you point the advantages of your > > purpose? > > I don't have a strong opinion on that one, though I find it a bit > easier to follow when the number of xfers is encoded in a separate > struct rather than extracted from the data size passed through the cmd > argument. I will change it then. Do you have any suggestion for the naming to keep it short? > > > - Regarding the ioctl codes, I tried to use those after I2C. > > Why start from 0x30? It doesn't make sense to me. Just because you base > your code on something that already exists doesn't mean you have to > copy all of it. I might be wrong but last I2C command is 0x20 and I tried to let some free space in case they need. Also I think that make sense I2C and I3C share the same 'magic number'. BTW, in ioctl-numbers documentation there is no reference for code 0x07. Best regards, Vitor Soares _______________________________________________ linux-i3c mailing list linux-i3c@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-i3c