v4.19.13 snapshot.
diff --git a/include/linux/ptp_clock_kernel.h b/include/linux/ptp_clock_kernel.h
new file mode 100644
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+++ b/include/linux/ptp_clock_kernel.h
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+/*
+ * PTP 1588 clock support
+ *
+ * Copyright (C) 2010 OMICRON electronics GmbH
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _PTP_CLOCK_KERNEL_H_
+#define _PTP_CLOCK_KERNEL_H_
+
+#include <linux/device.h>
+#include <linux/pps_kernel.h>
+#include <linux/ptp_clock.h>
+
+
+struct ptp_clock_request {
+ enum {
+ PTP_CLK_REQ_EXTTS,
+ PTP_CLK_REQ_PEROUT,
+ PTP_CLK_REQ_PPS,
+ } type;
+ union {
+ struct ptp_extts_request extts;
+ struct ptp_perout_request perout;
+ };
+};
+
+struct system_device_crosststamp;
+/**
+ * struct ptp_clock_info - decribes a PTP hardware clock
+ *
+ * @owner: The clock driver should set to THIS_MODULE.
+ * @name: A short "friendly name" to identify the clock and to
+ * help distinguish PHY based devices from MAC based ones.
+ * The string is not meant to be a unique id.
+ * @max_adj: The maximum possible frequency adjustment, in parts per billon.
+ * @n_alarm: The number of programmable alarms.
+ * @n_ext_ts: The number of external time stamp channels.
+ * @n_per_out: The number of programmable periodic signals.
+ * @n_pins: The number of programmable pins.
+ * @pps: Indicates whether the clock supports a PPS callback.
+ * @pin_config: Array of length 'n_pins'. If the number of
+ * programmable pins is nonzero, then drivers must
+ * allocate and initialize this array.
+ *
+ * clock operations
+ *
+ * @adjfine: Adjusts the frequency of the hardware clock.
+ * parameter scaled_ppm: Desired frequency offset from
+ * nominal frequency in parts per million, but with a
+ * 16 bit binary fractional field.
+ *
+ * @adjfreq: Adjusts the frequency of the hardware clock.
+ * This method is deprecated. New drivers should implement
+ * the @adjfine method instead.
+ * parameter delta: Desired frequency offset from nominal frequency
+ * in parts per billion
+ *
+ * @adjtime: Shifts the time of the hardware clock.
+ * parameter delta: Desired change in nanoseconds.
+ *
+ * @gettime64: Reads the current time from the hardware clock.
+ * parameter ts: Holds the result.
+ *
+ * @getcrosststamp: Reads the current time from the hardware clock and
+ * system clock simultaneously.
+ * parameter cts: Contains timestamp (device,system) pair,
+ * where system time is realtime and monotonic.
+ *
+ * @settime64: Set the current time on the hardware clock.
+ * parameter ts: Time value to set.
+ *
+ * @enable: Request driver to enable or disable an ancillary feature.
+ * parameter request: Desired resource to enable or disable.
+ * parameter on: Caller passes one to enable or zero to disable.
+ *
+ * @verify: Confirm that a pin can perform a given function. The PTP
+ * Hardware Clock subsystem maintains the 'pin_config'
+ * array on behalf of the drivers, but the PHC subsystem
+ * assumes that every pin can perform every function. This
+ * hook gives drivers a way of telling the core about
+ * limitations on specific pins. This function must return
+ * zero if the function can be assigned to this pin, and
+ * nonzero otherwise.
+ * parameter pin: index of the pin in question.
+ * parameter func: the desired function to use.
+ * parameter chan: the function channel index to use.
+ *
+ * @do_work: Request driver to perform auxiliary (periodic) operations
+ * Driver should return delay of the next auxiliary work scheduling
+ * time (>=0) or negative value in case further scheduling
+ * is not required.
+ *
+ * Drivers should embed their ptp_clock_info within a private
+ * structure, obtaining a reference to it using container_of().
+ *
+ * The callbacks must all return zero on success, non-zero otherwise.
+ */
+
+struct ptp_clock_info {
+ struct module *owner;
+ char name[16];
+ s32 max_adj;
+ int n_alarm;
+ int n_ext_ts;
+ int n_per_out;
+ int n_pins;
+ int pps;
+ struct ptp_pin_desc *pin_config;
+ int (*adjfine)(struct ptp_clock_info *ptp, long scaled_ppm);
+ int (*adjfreq)(struct ptp_clock_info *ptp, s32 delta);
+ int (*adjtime)(struct ptp_clock_info *ptp, s64 delta);
+ int (*gettime64)(struct ptp_clock_info *ptp, struct timespec64 *ts);
+ int (*getcrosststamp)(struct ptp_clock_info *ptp,
+ struct system_device_crosststamp *cts);
+ int (*settime64)(struct ptp_clock_info *p, const struct timespec64 *ts);
+ int (*enable)(struct ptp_clock_info *ptp,
+ struct ptp_clock_request *request, int on);
+ int (*verify)(struct ptp_clock_info *ptp, unsigned int pin,
+ enum ptp_pin_function func, unsigned int chan);
+ long (*do_aux_work)(struct ptp_clock_info *ptp);
+};
+
+struct ptp_clock;
+
+enum ptp_clock_events {
+ PTP_CLOCK_ALARM,
+ PTP_CLOCK_EXTTS,
+ PTP_CLOCK_PPS,
+ PTP_CLOCK_PPSUSR,
+};
+
+/**
+ * struct ptp_clock_event - decribes a PTP hardware clock event
+ *
+ * @type: One of the ptp_clock_events enumeration values.
+ * @index: Identifies the source of the event.
+ * @timestamp: When the event occurred (%PTP_CLOCK_EXTTS only).
+ * @pps_times: When the event occurred (%PTP_CLOCK_PPSUSR only).
+ */
+
+struct ptp_clock_event {
+ int type;
+ int index;
+ union {
+ u64 timestamp;
+ struct pps_event_time pps_times;
+ };
+};
+
+#if IS_REACHABLE(CONFIG_PTP_1588_CLOCK)
+
+/**
+ * ptp_clock_register() - register a PTP hardware clock driver
+ *
+ * @info: Structure describing the new clock.
+ * @parent: Pointer to the parent device of the new clock.
+ *
+ * Returns a valid pointer on success or PTR_ERR on failure. If PHC
+ * support is missing at the configuration level, this function
+ * returns NULL, and drivers are expected to gracefully handle that
+ * case separately.
+ */
+
+extern struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
+ struct device *parent);
+
+/**
+ * ptp_clock_unregister() - unregister a PTP hardware clock driver
+ *
+ * @ptp: The clock to remove from service.
+ */
+
+extern int ptp_clock_unregister(struct ptp_clock *ptp);
+
+/**
+ * ptp_clock_event() - notify the PTP layer about an event
+ *
+ * @ptp: The clock obtained from ptp_clock_register().
+ * @event: Message structure describing the event.
+ */
+
+extern void ptp_clock_event(struct ptp_clock *ptp,
+ struct ptp_clock_event *event);
+
+/**
+ * ptp_clock_index() - obtain the device index of a PTP clock
+ *
+ * @ptp: The clock obtained from ptp_clock_register().
+ */
+
+extern int ptp_clock_index(struct ptp_clock *ptp);
+
+/**
+ * ptp_find_pin() - obtain the pin index of a given auxiliary function
+ *
+ * @ptp: The clock obtained from ptp_clock_register().
+ * @func: One of the ptp_pin_function enumerated values.
+ * @chan: The particular functional channel to find.
+ * Return: Pin index in the range of zero to ptp_clock_caps.n_pins - 1,
+ * or -1 if the auxiliary function cannot be found.
+ */
+
+int ptp_find_pin(struct ptp_clock *ptp,
+ enum ptp_pin_function func, unsigned int chan);
+
+/**
+ * ptp_schedule_worker() - schedule ptp auxiliary work
+ *
+ * @ptp: The clock obtained from ptp_clock_register().
+ * @delay: number of jiffies to wait before queuing
+ * See kthread_queue_delayed_work() for more info.
+ */
+
+int ptp_schedule_worker(struct ptp_clock *ptp, unsigned long delay);
+
+#else
+static inline struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
+ struct device *parent)
+{ return NULL; }
+static inline int ptp_clock_unregister(struct ptp_clock *ptp)
+{ return 0; }
+static inline void ptp_clock_event(struct ptp_clock *ptp,
+ struct ptp_clock_event *event)
+{ }
+static inline int ptp_clock_index(struct ptp_clock *ptp)
+{ return -1; }
+static inline int ptp_find_pin(struct ptp_clock *ptp,
+ enum ptp_pin_function func, unsigned int chan)
+{ return -1; }
+static inline int ptp_schedule_worker(struct ptp_clock *ptp,
+ unsigned long delay)
+{ return -EOPNOTSUPP; }
+
+#endif
+
+#endif