linux-kernel - [PATCH net-next v2 0/3] dpll: add Reference SYNC feature

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Message-Id: <20250509124651.1227098-1-arkadiusz.kubalewski@intel.com>
Date: Fri,  9 May 2025 14:46:48 +0200
From: Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
To: donald.hunter@...il.com,
	kuba@...nel.org,
	davem@...emloft.net,
	edumazet@...gle.com,
	pabeni@...hat.com,
	horms@...nel.org,
	vadim.fedorenko@...ux.dev,
	jiri@...nulli.us,
	anthony.l.nguyen@...el.com,
	przemyslaw.kitszel@...el.com,
	andrew+netdev@...n.ch,
	aleksandr.loktionov@...el.com
Cc: netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	intel-wired-lan@...ts.osuosl.org,
	linux-rdma@...r.kernel.org,
	Arkadiusz Kubalewski <arkadiusz.kubalewski@...el.com>
Subject: [PATCH net-next v2 0/3] dpll: add Reference SYNC feature

The device may support the Reference SYNC feature, which allows the
combination of two inputs into a Reference SYNC pair. In this
configuration, clock signals from both inputs are used to synchronize
the dpll device. The higher frequency signal is utilized for the loop
bandwidth of the DPLL, while the lower frequency signal is used to
syntonize the output signal of the DPLL device. This feature enables
the provision of a high-quality loop bandwidth signal from an external
source.

A capable input provides a list of inputs that can be paired to create
a Reference SYNC pair. To control this feature, the user must request a
desired state for a target pin: use ``DPLL_PIN_STATE_CONNECTED`` to
enable or ``DPLL_PIN_STATE_DISCONNECTED`` to disable the feature. Only
two pins can be bound to form a Reference SYNC pair at any given time.

Verify pins bind state/capabilities:
$ ./tools/net/ynl/pyynl/cli.py \
 --spec Documentation/netlink/specs/dpll.yaml \
 --do pin-get \
 --json '{"id":0}'
{'board-label': 'CVL-SDP22',
 'id': 0,
 [...]
 'reference-sync': [{'id': 1, 'state': 'disconnected'}],
 [...]}

Bind the pins by setting connected state between them:
$ ./tools/net/ynl/pyynl/cli.py \
 --spec Documentation/netlink/specs/dpll.yaml \
 --do pin-set \
 --json '{"id":0, "reference-sync":{"id":1, "state":"connected"}}'

Verify pins bind state:
$ ./tools/net/ynl/pyynl/cli.py \
 --spec Documentation/netlink/specs/dpll.yaml \
 --do pin-get \
 --json '{"id":0}'
{'board-label': 'CVL-SDP22',
 'id': 0,
 [...]
 'reference-sync': [{'id': 1, 'state': 'connected'}],
 [...]}

Unbind the pins by setting disconnected state between them:
$ ./tools/net/ynl/pyynl/cli.py \
 --spec Documentation/netlink/specs/dpll.yaml \
 --do pin-set \
 --json '{"id":0, "reference-sync":{"id":1, "state":"disconnected"}}'

v2:
- improved cover letter description of the feature

Arkadiusz Kubalewski (3):
  dpll: add reference-sync netlink attribute
  dpll: add reference sync get/set
  ice: add ref-sync dpll pins

 Documentation/driver-api/dpll.rst             |  25 +++
 Documentation/netlink/specs/dpll.yaml         |  19 ++
 drivers/dpll/dpll_core.c                      |  27 +++
 drivers/dpll/dpll_core.h                      |   2 +
 drivers/dpll/dpll_netlink.c                   | 188 ++++++++++++++++--
 drivers/dpll/dpll_nl.c                        |  10 +-
 drivers/dpll/dpll_nl.h                        |   1 +
 .../net/ethernet/intel/ice/ice_adminq_cmd.h   |   2 +
 drivers/net/ethernet/intel/ice/ice_dpll.c     | 186 +++++++++++++++++
 include/linux/dpll.h                          |  10 +
 include/uapi/linux/dpll.h                     |   1 +
 11 files changed, 451 insertions(+), 20 deletions(-)


base-commit: 46431fd5224f7f3bab2823992ae1cf6f2700f1ce
-- 
2.38.1