Re: [PATCH RFC RESEND 1/7] i3c: master: Support IBI-based wakeup capability

On Wed, Jul 01, 2026 at 11:15:27PM +0300, Adrian Hunter wrote:
> 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 <[email protected]>
> ---

Reviewed-by: Frank Li <[email protected]>

>  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
>

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