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15.20.2516.018; Thu, 12 Dec 2019 17:25:28 +0000 From: Vitor Soares To: Greg KH CC: "linux-kernel@vger.kernel.org" , "linux-i3c@lists.infradead.org" , Joao Pinto , "bbrezillon@kernel.org" , "wsa@the-dreams.de" , "arnd@arndb.de" , "broonie@kernel.org" Subject: RE: [RFC 5/5] i3c: add i3cdev module to expose i3c dev in /dev Thread-Topic: [RFC 5/5] i3c: add i3cdev module to expose i3c dev in /dev Thread-Index: AQHVr2/iKIpGMGLN70aN99S9k54hW6e2lpSAgAABfqCAABOtgIAAB2Hw Date: Thu, 12 Dec 2019 17:25:28 +0000 Message-ID: References: <20191212144459.GB1668196@kroah.com> <20191212160045.GA1672362@kroah.com> In-Reply-To: <20191212160045.GA1672362@kroah.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?OWUzNWJcbXNnc1xtc2ctNjIzYjFlNDUtMWQwNC0xMWVhLTgyNzQtYjgwOGNm?= 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-Network-Message-Id: bc210b81-51d0-4e12-a5cf-08d77f28486f X-MS-Exchange-CrossTenant-originalarrivaltime: 12 Dec 2019 17:25:28.5267 (UTC) 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: SRyO/la1rIA5aaT8mc3nQvGCPVkf/7oPIvrBf4cJ9eSn2UMgV+DXMDPP9YaS0oiA/5J8OfbaimmIk6A7JDvZRA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH2PR12MB3798 X-OriginatorOrg: synopsys.com Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Greg KH Date: Thu, Dec 12, 2019 at 16:00:45 > On Thu, Dec 12, 2019 at 02:56:56PM +0000, Vitor Soares wrote: > > Hi Greg, > >=20 > > From: Greg KH > > Date: Thu, Dec 12, 2019 at 14:44:59 > >=20 > > > On Tue, Dec 10, 2019 at 04:37:33PM +0100, Vitor Soares wrote: > > > > +static int __init i3cdev_init(void) > > > > +{ > > > > + int res; > > > > + > > > > + pr_info("i3c /dev entries driver\n"); > > >=20 > > > Please remove debugging information, kernel code should be quiet unle= ss > > > something goes wrong. > >=20 > > I will remove it. > >=20 > > >=20 > > > > + /* Dynamically request unused major number */ > > > > + res =3D alloc_chrdev_region(&i3cdev_number, 0, N_I3C_MINORS, "i3c= "); > > >=20 > > > Do you really need a whole major, or will a few minors work? > > >=20 > > > thanks, > > >=20 > > > greg k-h > >=20 > > I'm reserving one per device. What do you suggest? >=20 > How many devices do you have in a system? According to MIPI I3C spec, the maximum number of devices on a bus will=20 depend on trace length, bus load, and clock requirements. Frankly, I don't know what is the best compromise because it depends from=20 system to system and the end-use of it. In my case, I started developing=20 this to help me during the HC controller driver development. Even If I choose a fixed major, I wouldn't know in which one i3c fits. Best regards, Vitor Soares