ice: implement dpll interface to control cgu

Control over clock generation unit is required for further development
of Synchronous Ethernet feature. Interface provides ability to obtain
current state of a dpll, its sources and outputs which are pins, and
allows their configuration.

v9->v10:
- add support for DPLL_MODE_FREERUN mode
- use DPLL_LOCK_STATUS, remove ICE_DPLL_LOCK_STATUS
- fix mutex locking scheme
- implement callback phase_shift_get()
- notify on phase shift changes
- implement callbacks phase_adjust_get(), phase_adjust_set()

v8->v9:
- drop pointless 0 assignement
- ice_dpll_init(..) returns void instead of int
- fix context description of the functions
- fix ice_dpll_init(..) traces
- fix use package_label instead pf board_label for rclk pin
- be consistent on cgu presence naming
- remove indent in ice_dpll_deinit(..)
- remove unused struct field lock_err_num
- fix kworker resched behavior
- remove debug log from ice_dpll_deinit_worker(..)
- reorder ice internal functions
- release resources directly on error path
- remove redundant NULL checks when releasing resources
- do not assign NULL to pointers after releasing resources
- simplify variable assignement
- fix 'int ret;' declarations across the ice_dpll.c
- remove leftover ice_dpll_find(..)
- get pf pointer from dpll_priv without type cast
- improve error reporting
- fix documentation
- fix ice_dpll_update_state(..) flow
- fix return in case out of range prio set

Co-developed-by: Milena Olech <milena.olech@intel.com>
Signed-off-by: Milena Olech <milena.olech@intel.com>
Co-developed-by: Michal Michalik <michal.michalik@intel.com>
Signed-off-by: Michal Michalik <michal.michalik@intel.com>
Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>

Author: kubalewski

drivers/net/ethernet/intel/Kconfig

@@ -284,6 +284,7 @@ config ICE
 	select DIMLIB
 	select NET_DEVLINK
 	select PLDMFW
+	select DPLL
 	help
 	  This driver supports Intel(R) Ethernet Connection E800 Series of
 	  devices.  For more information on how to identify your adapter, go

drivers/net/ethernet/intel/ice/Makefile

@@ -34,7 +34,8 @@ ice-y := ice_main.o	\
 	 ice_lag.o	\
 	 ice_ethtool.o  \
 	 ice_repr.o	\
-	 ice_tc_lib.o
+	 ice_tc_lib.o	\
+	 ice_dpll.o
 ice-$(CONFIG_PCI_IOV) +=	\
 	ice_sriov.o		\
 	ice_virtchnl.o		\

drivers/net/ethernet/intel/ice/ice.h

@@ -76,6 +76,7 @@
 #include "ice_vsi_vlan_ops.h"
 #include "ice_gnss.h"
 #include "ice_irq.h"
+#include "ice_dpll.h"
 
 #define ICE_BAR0		0
 #define ICE_REQ_DESC_MULTIPLE	32
@@ -198,6 +199,7 @@
 enum ice_feature {
 	ICE_F_DSCP,
 	ICE_F_PTP_EXTTS,
+	ICE_F_PHY_RCLK,
 	ICE_F_SMA_CTRL,
 	ICE_F_CGU,
 	ICE_F_GNSS,
@@ -506,6 +508,7 @@ enum ice_pf_flags {
 	ICE_FLAG_UNPLUG_AUX_DEV,
 	ICE_FLAG_MTU_CHANGED,
 	ICE_FLAG_GNSS,			/* GNSS successfully initialized */
+	ICE_FLAG_DPLL,			/* SyncE/PTP dplls initialized */
 	ICE_PF_FLAGS_NBITS		/* must be last */
 };
 
@@ -635,6 +638,7 @@ struct ice_pf {
 #define ICE_VF_AGG_NODE_ID_START	65
 #define ICE_MAX_VF_AGG_NODES		32
 	struct ice_agg_node vf_agg_node[ICE_MAX_VF_AGG_NODES];
+	struct ice_dplls dplls;
 };
 
 struct ice_netdev_priv {