net: stmmac: Add Flexible PPS support

This adds support for Flexible PPS output (which is equivalent
to per_out output of PTP subsystem).

Tested using an oscilloscope and the following commands:

1) Start PTP4L:
	# ptp4l -A -4 -H -m -i eth0 &
2) Set Flexible PPS frequency:
	# echo <idx> <ts> <tns> <ps> <pns> > /sys/class/ptp/ptpX/period

Where, ts/tns is start time and ps/pns is period time, and ptpX is ptp
of eth0.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Joao Pinto <jpinto@synopsys.com>
Cc: Vitor Soares <soares@synopsys.com>
Cc: Giuseppe Cavallaro <peppe.cavallaro@st.com>
Cc: Alexandre Torgue <alexandre.torgue@st.com>
Cc: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
index fbfe5dcefa87..025efbf6145c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h
@@ -100,6 +100,13 @@ struct stmmac_tc_entry {
 	} __packed val;
 };
 
+#define STMMAC_PPS_MAX		4
+struct stmmac_pps_cfg {
+	bool available;
+	struct timespec64 start;
+	struct timespec64 period;
+};
+
 struct stmmac_priv {
 	/* Frequently used values are kept adjacent for cache effect */
 	u32 tx_count_frames;
@@ -160,6 +167,8 @@ struct stmmac_priv {
 	struct ptp_clock *ptp_clock;
 	struct ptp_clock_info ptp_clock_ops;
 	unsigned int default_addend;
+	u32 sub_second_inc;
+	u32 systime_flags;
 	u32 adv_ts;
 	int use_riwt;
 	int irq_wake;
@@ -181,6 +190,9 @@ struct stmmac_priv {
 	unsigned int tc_entries_max;
 	unsigned int tc_off_max;
 	struct stmmac_tc_entry *tc_entries;
+
+	/* Pulse Per Second output */
+	struct stmmac_pps_cfg pps[STMMAC_PPS_MAX];
 };
 
 enum stmmac_state {