greybus: greybus_protocols.h Add SVC_TIMESYNC_WAKE_PINS_ACQUIRE/RELEASE

Its necessary to establish an initial state on the wake-detect lines before
enabling timesync on APB/GPB in order to ensure all GPIO edge-transitions are
correctly interpreted by the receiving processor.

This patch adds the operations defined in the Greybus specification to
greybus_protocols.h, this involves adding the
SVC_TIMESYNC_WAKE_PINS_ACQUIRE and SVC_TIMESYNC_WAKE_PINS_RELEASE commands
and moving the 'strobe_mask' parameter from 'struct
gb_svc_timesync_enable_request' to 'struct
gb_svc_timesync_wd_pins_acquire_request' since the communication of the
strobe_mask will be communicated before preparing any of the bridges to
receive the TimeSync pulses.

A separate patch to the greybus specification describes the transition
between the wake sub-state and the timesync sub-state.
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Vaibhav Hiremath <vaibhav.hiremath@linaro.org>
Reviewed-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

drivers/staging/greybus/greybus_protocols.h

@@ -835,6 +835,8 @@ struct gb_spi_transfer_response {
 #define GB_SVC_TYPE_PWRMON_RAIL_NAMES_GET	0x15
 #define GB_SVC_TYPE_PWRMON_SAMPLE_GET		0x16
 #define GB_SVC_TYPE_PWRMON_INTF_SAMPLE_GET	0x17
+#define GB_SVC_TYPE_TIMESYNC_WAKE_PINS_ACQUIRE	0x18
+#define GB_SVC_TYPE_TIMESYNC_WAKE_PINS_RELEASE	0x19
 #define GB_SVC_TYPE_MODULE_INSERTED		0x1f
 #define GB_SVC_TYPE_MODULE_REMOVED		0x20
 #define GB_SVC_TYPE_INTF_ACTIVATE		0x27
@@ -955,7 +957,6 @@ struct gb_svc_timesync_enable_request {
 	__u8	count;
 	__le64	frame_time;
 	__le32	strobe_delay;
-	__le32	strobe_mask;
 	__le32	refclk;
 } __packed;
 /* timesync enable response has no payload */
@@ -965,6 +966,15 @@ struct gb_svc_timesync_authoritative_response {
 	__le64	frame_time[GB_TIMESYNC_MAX_STROBES];
 };
 
+struct gb_svc_timesync_wake_pins_acquire_request {
+	__le32	strobe_mask;
+};
+
+/* timesync wake pins acquire response has no payload */
+
+/* timesync wake pins release request has no payload */
+/* timesync wake pins release response has no payload */
+
 #define GB_SVC_UNIPRO_FAST_MODE			0x01
 #define GB_SVC_UNIPRO_SLOW_MODE			0x02
 #define GB_SVC_UNIPRO_FAST_AUTO_MODE		0x04