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Thu, 8 Apr 2021 18:59:19 +0000 From: Min Li To: Greg KH CC: "derek.kiernan@xilinx.com" , "dragan.cvetic@xilinx.com" , "arnd@arndb.de" , "linux-kernel@vger.kernel.org" Subject: RE: [PATCH net-next v3 2/2] misc: Add Renesas Synchronization Management Unit (SMU) support Thread-Topic: [PATCH net-next v3 2/2] misc: Add Renesas Synchronization Management Unit (SMU) support Thread-Index: AQHXLBphHjneZXXdB0ur+8N3VlMUXaqqJv4AgAC3vHCAAAllAIAAAJzwgAAD8ICAAAu6UA== Date: Thu, 8 Apr 2021 18:59:19 +0000 Message-ID: References: <1617846650-10058-1-git-send-email-min.li.xe@renesas.com> <1617846650-10058-2-git-send-email-min.li.xe@renesas.com> In-Reply-To: Accept-Language: en-CA, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: linuxfoundation.org; dkim=none (message not signed) header.d=none;linuxfoundation.org; dmarc=none action=none header.from=renesas.com; x-originating-ip: [72.140.114.230] x-ms-publictraffictype: Email x-ms-office365-filtering-correlation-id: 914c7bb7-aeb9-4ea9-be30-08d8fac06a77 x-ms-traffictypediagnostic: OSBPR01MB3093: x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:7691; 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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: renesas.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: OSBPR01MB4773.jpnprd01.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 914c7bb7-aeb9-4ea9-be30-08d8fac06a77 X-MS-Exchange-CrossTenant-originalarrivaltime: 08 Apr 2021 18:59:19.8303 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 53d82571-da19-47e4-9cb4-625a166a4a2a X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: RSfaNp12o0dqagzUOWr3NH0eG8GT4Ykii0xXxl86o14j5F4XwJdIeqGm1J8AbIi0VMovcmoSW8aPwmZqwgxbfQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: OSBPR01MB3093 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org >=20 > But what does that have to do with the misc device? >=20 Hi Greg, MFD driver is the start of everything. Once MFD driver is loading,= it will spawn 2 devices, =20 one is for phc driver, which is under /driver/ptp and the other one is for = this misc driver. =20 Both PHC and misc drivers are operating on the same device.=20 They are both calling exported functions from mfd drivers to access the dev= ice through i2c/spi=20 and the register definitions are located in include/Linux/mfd/idt8a340_reg.= h or idt82p33_reg.h depending on which device was found by mfd driver through device tree node.