ptp: Add adjust_phase to ptp_clock_caps capability.

Add adjust_phase to ptp_clock_caps capability to allow
user to query if a PHC driver supports adjust phase with
ioctl PTP_CLOCK_GETCAPS command.

Signed-off-by: Vincent Cheng <vincent.cheng.xh@renesas.com>
Reviewed-by: Richard Cochran <richardcochran@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/ptp/ptp_chardev.c

@@ -136,6 +136,7 @@ long ptp_ioctl(struct posix_clock *pc, unsigned int cmd, unsigned long arg)
 		caps.pps = ptp->info->pps;
 		caps.n_pins = ptp->info->n_pins;
 		caps.cross_timestamping = ptp->info->getcrosststamp != NULL;
+		caps.adjust_phase = ptp->info->adjphase != NULL;
 		if (copy_to_user((void __user *)arg, &caps, sizeof(caps)))
 			err = -EFAULT;
 		break;

include/uapi/linux/ptp_clock.h

@@ -89,7 +89,9 @@ struct ptp_clock_caps {
 	int n_pins;    /* Number of input/output pins. */
 	/* Whether the clock supports precise system-device cross timestamps */
 	int cross_timestamping;
-	int rsv[13];   /* Reserved for future use. */
+	/* Whether the clock supports adjust phase */
+	int adjust_phase;
+	int rsv[12];   /* Reserved for future use. */
 };
 
 struct ptp_extts_request {

tools/testing/selftests/ptp/testptp.c

@@ -269,14 +269,16 @@ int main(int argc, char *argv[])
 			       "  %d programmable periodic signals\n"
 			       "  %d pulse per second\n"
 			       "  %d programmable pins\n"
-			       "  %d cross timestamping\n",
+			       "  %d cross timestamping\n"
+			       "  %d adjust_phase\n",
 			       caps.max_adj,
 			       caps.n_alarm,
 			       caps.n_ext_ts,
 			       caps.n_per_out,
 			       caps.pps,
 			       caps.n_pins,
-			       caps.cross_timestamping);
+			       caps.cross_timestamping,
+			       caps.adjust_phase);
 		}
 	}