[PATCH V2 2/8] i3c: master: Support IBI-based wakeup capability

[Adrian Hunter]

An I3C controller acts as a bus controller for one or more I3C devices.
If the controller can wake the system in response to an In-Band
Interrupt (IBI), then any device on that bus that is capable of
generating IBIs can potentially be used as a wakeup source.

Add an ibi_wakeup flag to struct i3c_master_controller so controller
drivers can advertise support for IBI-based wakeup.

If set, mark IBI-capable I3C devices as wakeup capable when they are
registered, allowing wakeup management through the standard device
wakeup framework.

Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
---


Changes in V2:

	Dropped the redundant #include <linux/pm_wakeup.h>.  That header
	must not be included directly, and linux/device.h, which is
	already included, provides device_set_wakeup_capable().


 drivers/i3c/master.c       | 7 +++++++
 include/linux/i3c/master.h | 2 ++
 2 files changed, 9 insertions(+)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 874f6e11b296..cf3345265ac0 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -2008,6 +2008,13 @@ i3c_master_register_new_i3c_devs(struct i3c_master_controller *master)
 		if (desc->boardinfo)
 			desc->dev->dev.of_node = desc->boardinfo->of_node;
 
+		/*
+		 * In the case of IBI wakeup, any IBI-capable device can
+		 * wakeup.
+		 */
+		if (master->ibi_wakeup && (desc->info.bcr & I3C_BCR_IBI_REQ_CAP))
+			device_set_wakeup_capable(&desc->dev->dev, true);
+
 		list_add_tail(&desc->dev->node, &i3c_unreg_devs);
 	}
 
diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h
index fa1c98f0f5c1..99f89fef7653 100644
--- a/include/linux/i3c/master.h
+++ b/include/linux/i3c/master.h
@@ -513,6 +513,7 @@ struct i3c_master_controller_ops {
  * @hotjoin: true if the master support hotjoin
  * @rpm_allowed: true if Runtime PM allowed
  * @rpm_ibi_allowed: true if IBI and Hot-Join allowed while runtime suspended
+ * @ibi_wakeup: IBI can wakeup the system
  * @shutting_down: set to true when master begins shutdown or unregister
  * @boardinfo.i3c: list of I3C  boardinfo objects
  * @boardinfo.i2c: list of I2C boardinfo objects
@@ -547,6 +548,7 @@ struct i3c_master_controller {
 	unsigned int hotjoin: 1;
 	unsigned int rpm_allowed: 1;
 	unsigned int rpm_ibi_allowed: 1;
+	unsigned int ibi_wakeup: 1;
 	bool shutting_down;
 	struct {
 		struct list_head i3c;
-- 
2.53.0