ptp: ptp_clockmatrix: Add PTP_CLK_REQ_EXTTS support

Use TOD_READ_SECONDARY for extts to keep TOD_READ_PRIMARY
for gettime and settime exclusively. Before this change,
TOD_READ_PRIMARY was used for both extts and gettime/settime,
which would result in changing TOD read/write triggers between
operations. Using TOD_READ_SECONDARY would make extts
independent of gettime/settime operation
Signed-off-by: Min Li <min.li.xe@renesas.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Link: https://lore.kernel.org/r/1652712427-14703-1-git-send-email-min.li.xe@renesas.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/ptp/ptp_clockmatrix.h

@@ -10,11 +10,13 @@
 
 #include <linux/ktime.h>
 #include <linux/mfd/idt8a340_reg.h>
+#include <linux/ptp_clock.h>
 #include <linux/regmap.h>
 
 #define FW_FILENAME	"idtcm.bin"
 #define MAX_TOD		(4)
 #define MAX_PLL		(8)
+#define MAX_REF_CLK	(16)
 
 #define MAX_ABS_WRITE_PHASE_PICOSECONDS (107374182350LL)
 
@@ -90,6 +92,7 @@ struct idtcm_channel {
 	u16			dpll_ctrl_n;
 	u16			dpll_phase_pull_in;
 	u16			tod_read_primary;
+	u16			tod_read_secondary;
 	u16			tod_write;
 	u16			tod_n;
 	u16			hw_dpll_n;
@@ -105,6 +108,7 @@ struct idtcm_channel {
 	/* last input trigger for extts */
 	u8			refn;
 	u8			pll;
+	u8			tod;
 	u16			output_mask;
 };
 
@@ -116,6 +120,7 @@ struct idtcm {
 	enum fw_version		fw_ver;
 	/* Polls for external time stamps */
 	u8			extts_mask;
+	bool			extts_single_shot;
 	struct delayed_work	extts_work;
 	/* Remember the ptp channel to report extts */
 	struct idtcm_channel	*event_channel[MAX_TOD];

include/linux/mfd/idt8a340_reg.h

@@ -407,7 +407,7 @@
 #define TOD_READ_PRIMARY_0                0xcc40
 #define TOD_READ_PRIMARY_0_V520           0xcc50
 /* 8-bit subns, 32-bit ns, 48-bit seconds */
-#define TOD_READ_PRIMARY                  0x0000
+#define TOD_READ_PRIMARY_BASE             0x0000
 /* Counter increments after TOD write is completed */
 #define TOD_READ_PRIMARY_COUNTER          0x000b
 /* Read trigger configuration */
@@ -424,6 +424,16 @@
 
 #define TOD_READ_SECONDARY_0              0xcc90
 #define TOD_READ_SECONDARY_0_V520         0xcca0
+/* 8-bit subns, 32-bit ns, 48-bit seconds */
+#define TOD_READ_SECONDARY_BASE           0x0000
+/* Counter increments after TOD write is completed */
+#define TOD_READ_SECONDARY_COUNTER        0x000b
+/* Read trigger configuration */
+#define TOD_READ_SECONDARY_SEL_CFG_0      0x000c
+/* Read trigger selection */
+#define TOD_READ_SECONDARY_CMD            0x000e
+#define TOD_READ_SECONDARY_CMD_V520       0x000f
+
 #define TOD_READ_SECONDARY_1              0xcca0
 #define TOD_READ_SECONDARY_1_V520         0xccb0
 #define TOD_READ_SECONDARY_2              0xccb0