[PATCH net-next 1/8] dpll: add new DPLL type for transmit clock (TXC) usage
From: Grzegorz Nitka
Date: Wed Mar 18 2026 - 05:15:01 EST
Extend the DPLL subsystem with a new DPLL type, DPLL_TYPE_TXC,
representing devices that drive a transmit reference clock. Certain
PHYs, MACs and SerDes blocks use a dedicated TX reference clock for
link operation, and this clock domain is distinct from PPS- and
EEC-driven synchronization sources. Defining a dedicated type allows
user space and drivers to correctly classify and configure DPLLs
intended for TX clock generation.
The corresponding netlink specification is updated to expose "txc"
Reviewed-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@xxxxxxxxx>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@xxxxxxxxx>
Signed-off-by: Grzegorz Nitka <grzegorz.nitka@xxxxxxxxx>
---
Documentation/netlink/specs/dpll.yaml | 3 +++
include/uapi/linux/dpll.h | 2 ++
2 files changed, 5 insertions(+)
diff --git a/Documentation/netlink/specs/dpll.yaml b/Documentation/netlink/specs/dpll.yaml
index 3dd48a32f783..2a2ee37a1fc0 100644
--- a/Documentation/netlink/specs/dpll.yaml
+++ b/Documentation/netlink/specs/dpll.yaml
@@ -138,6 +138,9 @@ definitions:
-
name: eec
doc: dpll drives the Ethernet Equipment Clock
+ -
+ name: txc
+ doc: dpll drives Tx reference clock
render-max: true
-
type: enum
diff --git a/include/uapi/linux/dpll.h b/include/uapi/linux/dpll.h
index de0005f28e5c..a277d08ac264 100644
--- a/include/uapi/linux/dpll.h
+++ b/include/uapi/linux/dpll.h
@@ -109,10 +109,12 @@ enum dpll_clock_quality_level {
* enum dpll_type - type of dpll, valid values for DPLL_A_TYPE attribute
* @DPLL_TYPE_PPS: dpll produces Pulse-Per-Second signal
* @DPLL_TYPE_EEC: dpll drives the Ethernet Equipment Clock
+ * @DPLL_TYPE_TXC: dpll drives Tx reference clock signal
*/
enum dpll_type {
DPLL_TYPE_PPS = 1,
DPLL_TYPE_EEC,
+ DPLL_TYPE_TXC,
/* private: */
__DPLL_TYPE_MAX,
--
2.39.3