[RFC PATCH 1/3] pps: Add PPS_SETCLOCK ioctl

[Gerik Kubiak <gerikkub@gmail.com>]

Add the PPS_SETCLOCK ioctl to the pps driver and an associated
pps_kclock_source structure used as an arugment in the ioctl. This ioctl
allows userspace to specify the clock used in timestamping PPS events.

Adds a pps_kclock_source structure for this ioctl. It contains one value,
clock_id, which holds the requested clock source for subsequent PPS events.

Signed-off-by: Gerik Kubiak <gerikkub@gmail.com>
---
 include/uapi/linux/pps.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/include/uapi/linux/pps.h b/include/uapi/linux/pps.h
index 009ebcd8ced5..db233511c6ef 100644
--- a/include/uapi/linux/pps.h
+++ b/include/uapi/linux/pps.h
@@ -87,6 +87,10 @@ struct pps_kparams {
 	struct pps_ktime clear_off_tu;	/* offset compensation for clear */
 };
 
+struct pps_kclock_source {
+	__u32 clock_id;  /* System clock id */
+};
+
 /*
  * 3.3 Mode bit definitions
  */
@@ -140,6 +144,7 @@ struct pps_bind_args {
 	int consumer;	/* selected kernel consumer */
 };
 
+
 #include <linux/ioctl.h>
 
 #define PPS_GETPARAMS		_IOR('p', 0xa1, struct pps_kparams *)
@@ -147,5 +152,6 @@ struct pps_bind_args {
 #define PPS_GETCAP		_IOR('p', 0xa3, int *)
 #define PPS_FETCH		_IOWR('p', 0xa4, struct pps_fdata *)
 #define PPS_KC_BIND		_IOW('p', 0xa5, struct pps_bind_args *)
+#define PPS_SETCLOCK		_IOW('p', 0xa6, struct pps_clock_source *)
 
 #endif /* _PPS_H_ */
-- 
2.54.0