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charset="us-ascii" Content-Transfer-Encoding: quoted-printable Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-OriginatorOrg: nxp.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: PAXPR04MB8510.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 25938e4e-3432-4ee9-cebb-08ddc50c2767 X-MS-Exchange-CrossTenant-originalarrivaltime: 17 Jul 2025 08:30:14.7242 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 686ea1d3-bc2b-4c6f-a92c-d99c5c301635 X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: JBQI3omvZSDNElhHMhy0oNGEPL7lHMfQymgxyX9nWIXZqt321Dzr632gwbmJtVZob5hQ5+6WoBbV8q2j7Zlstw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AS1PR04MB9682 > On Wed, Jul 16, 2025 at 03:30:58PM +0800, Wei Fang wrote: > > +properties: > > + compatible: > > + enum: > > + - pci1131,ee02 > > + > > + reg: > > + maxItems: 1 > > + > > + clocks: > > + maxItems: 1 > > + description: > > + The reference clock of NETC Timer, if not present, indicates tha= t > > + the system clock of NETC IP is selected as the reference clock. >=20 > If not present... >=20 > > + > > + clock-names: >=20 > ... this also is not present... >=20 > > + description: > > + NETC Timer has three reference clock sources, set > TMR_CTRL[CK_SEL] > > + by parsing clock name to select one of them as the reference clo= ck. > > + The "system" means that the system clock of NETC IP is used as t= he > > + reference clock. > > + The "ccm_timer" means another clock from CCM as the reference > clock. > > + The "ext_1588" means the reference clock comes from external IO > pins. > > + enum: > > + - system >=20 > So what does system mean? >=20 "system" is the system clock of the NETC subsystem, we can explicitly speci= fy this clock as the PTP reference clock of the Timer in the DT node. Or do no= t add clock properties to the DT node, it implicitly indicates that the refer= ence clock of the Timer is the "system" clock.