[PATCH net-next 2/3] net: dsa: mv88e6xxx: extend PTP gettime function to read system clock

[Hubert Feurstein <h.feurstein@gmail.com>]

This adds support for the PTP_SYS_OFFSET_EXTENDED ioctl.

Signed-off-by: Hubert Feurstein <h.feurstein@gmail.com>
---
 drivers/net/dsa/mv88e6xxx/chip.h |  2 ++
 drivers/net/dsa/mv88e6xxx/ptp.c  | 11 +++++++----
 drivers/net/dsa/mv88e6xxx/smi.c  |  3 ++-
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/net/dsa/mv88e6xxx/chip.h b/drivers/net/dsa/mv88e6xxx/chip.h
index 01963ee94c50..9e14dc406415 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.h
+++ b/drivers/net/dsa/mv88e6xxx/chip.h
@@ -277,6 +277,8 @@ struct mv88e6xxx_chip {
 	struct ptp_clock_info	ptp_clock_info;
 	struct delayed_work	tai_event_work;
 	struct ptp_pin_desc	pin_config[MV88E6XXX_MAX_GPIO];
+	struct ptp_system_timestamp *ptp_sts;
+
 	u16 trig_config;
 	u16 evcap_config;
 	u16 enable_count;
diff --git a/drivers/net/dsa/mv88e6xxx/ptp.c b/drivers/net/dsa/mv88e6xxx/ptp.c
index 073cbd0bb91b..cf6e52ee9e0a 100644
--- a/drivers/net/dsa/mv88e6xxx/ptp.c
+++ b/drivers/net/dsa/mv88e6xxx/ptp.c
@@ -235,14 +235,17 @@ static int mv88e6xxx_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta)
 	return 0;
 }
 
-static int mv88e6xxx_ptp_gettime(struct ptp_clock_info *ptp,
-				 struct timespec64 *ts)
+static int mv88e6xxx_ptp_gettimex(struct ptp_clock_info *ptp,
+				  struct timespec64 *ts,
+				  struct ptp_system_timestamp *sts)
 {
 	struct mv88e6xxx_chip *chip = ptp_to_chip(ptp);
 	u64 ns;
 
 	mv88e6xxx_reg_lock(chip);
+	chip->ptp_sts = sts;
 	ns = timecounter_read(&chip->tstamp_tc);
+	chip->ptp_sts = NULL;
 	mv88e6xxx_reg_unlock(chip);
 
 	*ts = ns_to_timespec64(ns);
@@ -426,7 +429,7 @@ static void mv88e6xxx_ptp_overflow_check(struct work_struct *work)
 	struct mv88e6xxx_chip *chip = dw_overflow_to_chip(dw);
 	struct timespec64 ts;
 
-	mv88e6xxx_ptp_gettime(&chip->ptp_clock_info, &ts);
+	mv88e6xxx_ptp_gettimex(&chip->ptp_clock_info, &ts, NULL);
 
 	schedule_delayed_work(&chip->overflow_work,
 			      MV88E6XXX_TAI_OVERFLOW_PERIOD);
@@ -472,7 +475,7 @@ int mv88e6xxx_ptp_setup(struct mv88e6xxx_chip *chip)
 	chip->ptp_clock_info.max_adj    = MV88E6XXX_MAX_ADJ_PPB;
 	chip->ptp_clock_info.adjfine	= mv88e6xxx_ptp_adjfine;
 	chip->ptp_clock_info.adjtime	= mv88e6xxx_ptp_adjtime;
-	chip->ptp_clock_info.gettime64	= mv88e6xxx_ptp_gettime;
+	chip->ptp_clock_info.gettimex64	= mv88e6xxx_ptp_gettimex;
 	chip->ptp_clock_info.settime64	= mv88e6xxx_ptp_settime;
 	chip->ptp_clock_info.enable	= ptp_ops->ptp_enable;
 	chip->ptp_clock_info.verify	= ptp_ops->ptp_verify;
diff --git a/drivers/net/dsa/mv88e6xxx/smi.c b/drivers/net/dsa/mv88e6xxx/smi.c
index 5fc78a063843..e3b0096a9d94 100644
--- a/drivers/net/dsa/mv88e6xxx/smi.c
+++ b/drivers/net/dsa/mv88e6xxx/smi.c
@@ -45,7 +45,8 @@ static int mv88e6xxx_smi_direct_write(struct mv88e6xxx_chip *chip,
 {
 	int ret;
 
-	ret = mdiobus_write_nested(chip->bus, dev, reg, data);
+	ret = mdiobus_write_sts_nested(chip->bus, dev, reg, data,
+				       chip->ptp_sts);
 	if (ret < 0)
 		return ret;
 
-- 
2.22.1