add ax88772_rst

hc

2024-05-10 9999e48639b3cecb08ffb37358bcba3b48161b29

 kernel/include/linux/ptp_clock_kernel.h
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@@ -1,21 +1,8 @@
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
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 /*
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  * PTP 1588 clock support
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  *
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  * Copyright (C) 2010 OMICRON electronics GmbH
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- *
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- *  This program is free software; you can redistribute it and/or modify
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- *  it under the terms of the GNU General Public License as published by
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- *  the Free Software Foundation; either version 2 of the License, or
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- *  (at your option) any later version.
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- *
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- *  This program is distributed in the hope that it will be useful,
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- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
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- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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- *  GNU General Public License for more details.
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- *
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- *  You should have received a copy of the GNU General Public License
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- *  along with this program; if not, write to the Free Software
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- *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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  */
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 #ifndef _PTP_CLOCK_KERNEL_H_
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@@ -39,8 +26,17 @@
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 };
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 struct system_device_crosststamp;
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+
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 /**
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- * struct ptp_clock_info - decribes a PTP hardware clock
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+ * struct ptp_system_timestamp - system time corresponding to a PHC timestamp
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+ */
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+struct ptp_system_timestamp {
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+	struct timespec64 pre_ts;
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+	struct timespec64 post_ts;
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+};
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+
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+/**
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+ * struct ptp_clock_info - describes a PTP hardware clock
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  *
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  * @owner:     The clock driver should set to THIS_MODULE.
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  * @name:      A short "friendly name" to identify the clock and to
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@@ -69,11 +65,24 @@
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  *            parameter delta: Desired frequency offset from nominal frequency
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  *            in parts per billion
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  *
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+ * @adjphase:  Adjusts the phase offset of the hardware clock.
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+ *             parameter delta: Desired change in nanoseconds.
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+ *
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  * @adjtime:  Shifts the time of the hardware clock.
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  *            parameter delta: Desired change in nanoseconds.
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  *
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  * @gettime64:  Reads the current time from the hardware clock.
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+ *              This method is deprecated.  New drivers should implement
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+ *              the @gettimex64 method instead.
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  *              parameter ts: Holds the result.
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+ *
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+ * @gettimex64:  Reads the current time from the hardware clock and optionally
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+ *               also the system clock.
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+ *               parameter ts: Holds the PHC timestamp.
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+ *               parameter sts: If not NULL, it holds a pair of timestamps from
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+ *               the system clock. The first reading is made right before
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+ *               reading the lowest bits of the PHC timestamp and the second
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+ *               reading immediately follows that.
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  *
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  * @getcrosststamp:  Reads the current time from the hardware clock and
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  *                   system clock simultaneously.
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@@ -99,10 +108,10 @@
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  *            parameter func: the desired function to use.
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  *            parameter chan: the function channel index to use.
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  *
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- * @do_work:  Request driver to perform auxiliary (periodic) operations
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- *	      Driver should return delay of the next auxiliary work scheduling
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- *	      time (>=0) or negative value in case further scheduling
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- *	      is not required.
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+ * @do_aux_work:  Request driver to perform auxiliary (periodic) operations
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+ *                Driver should return delay of the next auxiliary work
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+ *                scheduling time (>=0) or negative value in case further
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+ *                scheduling is not required.
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  *
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  * Drivers should embed their ptp_clock_info within a private
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  * structure, obtaining a reference to it using container_of().
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@@ -122,8 +131,11 @@
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 	struct ptp_pin_desc *pin_config;
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 	int (*adjfine)(struct ptp_clock_info *ptp, long scaled_ppm);
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 	int (*adjfreq)(struct ptp_clock_info *ptp, s32 delta);
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+	int (*adjphase)(struct ptp_clock_info *ptp, s32 phase);
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 	int (*adjtime)(struct ptp_clock_info *ptp, s64 delta);
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 	int (*gettime64)(struct ptp_clock_info *ptp, struct timespec64 *ts);
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+	int (*gettimex64)(struct ptp_clock_info *ptp, struct timespec64 *ts,
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+			  struct ptp_system_timestamp *sts);
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 	int (*getcrosststamp)(struct ptp_clock_info *ptp,
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 			      struct system_device_crosststamp *cts);
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 	int (*settime64)(struct ptp_clock_info *p, const struct timespec64 *ts);
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@@ -215,6 +227,12 @@
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 /**
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  * ptp_find_pin() - obtain the pin index of a given auxiliary function
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  *
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+ * The caller must hold ptp_clock::pincfg_mux.  Drivers do not have
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+ * access to that mutex as ptp_clock is an opaque type.  However, the
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+ * core code acquires the mutex before invoking the driver's
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+ * ptp_clock_info::enable() callback, and so drivers may call this
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+ * function from that context.
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+ *
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  * @ptp:    The clock obtained from ptp_clock_register().
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  * @func:   One of the ptp_pin_function enumerated values.
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  * @chan:   The particular functional channel to find.
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 		 enum ptp_pin_function func, unsigned int chan);
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 /**
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+ * ptp_find_pin_unlocked() - wrapper for ptp_find_pin()
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+ *
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+ * This function acquires the ptp_clock::pincfg_mux mutex before
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+ * invoking ptp_find_pin().  Instead of using this function, drivers
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+ * should most likely call ptp_find_pin() directly from their
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+ * ptp_clock_info::enable() method.
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+ *
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+ */
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+
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+int ptp_find_pin_unlocked(struct ptp_clock *ptp,
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+			  enum ptp_pin_function func, unsigned int chan);
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+
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+/**
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  * ptp_schedule_worker() - schedule ptp auxiliary work
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  *
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  * @ptp:    The clock obtained from ptp_clock_register().
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  */
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 int ptp_schedule_worker(struct ptp_clock *ptp, unsigned long delay);
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+
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+/**
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+ * ptp_cancel_worker_sync() - cancel ptp auxiliary clock
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+ *
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+ * @ptp:     The clock obtained from ptp_clock_register().
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+ */
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+void ptp_cancel_worker_sync(struct ptp_clock *ptp);
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 #else
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 static inline struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
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 static inline int ptp_schedule_worker(struct ptp_clock *ptp,
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 				      unsigned long delay)
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 { return -EOPNOTSUPP; }
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+static inline void ptp_cancel_worker_sync(struct ptp_clock *ptp)
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+{ }
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 #endif
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+static inline void ptp_read_system_prets(struct ptp_system_timestamp *sts)
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+{
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+	if (sts)
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+		ktime_get_real_ts64(&sts->pre_ts);
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+}
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+
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+static inline void ptp_read_system_postts(struct ptp_system_timestamp *sts)
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+{
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+	if (sts)
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+		ktime_get_real_ts64(&sts->post_ts);
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+}
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+
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 #endif