[PATCH V5 08/14] 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 at intel.com>
Reviewed-by: Frank Li <Frank.Li at nxp.com>
Acked-by: Mukesh Savaliya <mukesh.savaliya at oss.qualcomm.com>
---


Changes in V5:

	Added Mukesh's Ack'd-by

Changes in V4:

	Shortened the comment about IBI-capable devices being wakeup
	capable.

Changes in V3:

	None

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       | 4 ++++
 include/linux/i3c/master.h | 2 ++
 2 files changed, 6 insertions(+)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index 83e04a2c202a..2616354dbe54 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -2110,6 +2110,10 @@ i3c_master_register_new_i3c_devs(struct i3c_master_controller *master)
 		if (desc->boardinfo)
 			device_set_node(&desc->dev->dev, desc->boardinfo->fwnode);
 
+		/* If the device has IBI capability, set as wakeup capable */
+		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 26535beb1e77..9d675d01522c 100644
--- a/include/linux/i3c/master.h
+++ b/include/linux/i3c/master.h
@@ -524,6 +524,7 @@ 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
@@ -563,6 +564,7 @@ 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