[PATCH RFC RESEND 1/7] 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>
---
 drivers/i3c/master.c       | 8 ++++++++
 include/linux/i3c/master.h | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
index f1be38a640ca..a47e2924bb70 100644
--- a/drivers/i3c/master.c
+++ b/drivers/i3c/master.c
@@ -17,6 +17,7 @@
 #include <linux/list.h>
 #include <linux/of.h>
 #include <linux/pm_runtime.h>
+#include <linux/pm_wakeup.h>
 #include <linux/slab.h>
 #include <linux/spinlock.h>
 #include <linux/workqueue.h>
@@ -1930,6 +1931,13 @@ 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);
+
 		ret = device_register(&desc->dev->dev);
 		if (ret) {
 			dev_err(&master->dev,
diff --git a/include/linux/i3c/master.h b/include/linux/i3c/master.h
index 4d2a68793324..af3c35a8e7b6 100644
--- a/include/linux/i3c/master.h
+++ b/include/linux/i3c/master.h
@@ -511,6 +511,7 @@ 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
@@ -545,6 +546,7 @@ 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