Re: [PATCH] usb: typec: add trace point for typec_set_mode

[Heikki Krogerus]

Hi Ahmad,

On Wed, Jun 17, 2026 at 10:03:04PM +0200, Ahmad Fatoum wrote:
> Some Type-C controllers toggle muxes themselves. Other controllers like
> the TUSB320 report the mode to the host, so it can control the muxes.
> 
> To improve debuggability of both kinds of drivers, add a trace point that
> can be used to keep track of the mode being set inside the Type-C
> framework:
> 
>   echo 1 > /sys/kernel/debug/tracing/events/typec/typec_mode/enable
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum@xxxxxxxxxxxxxx>
> ---
>  MAINTAINERS                  |  1 +
>  drivers/usb/typec/class.c    |  9 ++++++++-
>  include/trace/events/typec.h | 36 ++++++++++++++++++++++++++++++++++++
>  3 files changed, 45 insertions(+), 1 deletion(-)
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index c8d4b913f26c..ddd59e5e6eaf 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -27753,6 +27753,7 @@ F:	Documentation/ABI/testing/sysfs-class-typec
>  F:	Documentation/driver-api/usb/typec.rst
>  F:	drivers/usb/typec/
>  F:	include/linux/usb/typec.h
> +F:	include/trace/events/typec*.h
>  
>  USB TYPEC INTEL PMC MUX DRIVER
>  M:	Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
> diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> index 0977581ad1b6..9316d067f19a 100644
> --- a/drivers/usb/typec/class.c
> +++ b/drivers/usb/typec/class.c
> @@ -20,6 +20,9 @@
>  #include "class.h"
>  #include "pd.h"
>  
> +#define CREATE_TRACE_POINTS
> +#include <trace/events/typec.h>

Those should probable go to drivers/usb/typec/trace.c and then you
need add something like this to drivers/usb/typec/Makefile:

 obj-$(CONFIG_TYPEC)            += typec.o
 typec-y                                := class.o mux.o bus.o pd.o retimer.o mode_selection.o
 typec-$(CONFIG_ACPI)           += port-mapper.o
+typec-$(CONFIG_TRACING)                += trace.o
 obj-$(CONFIG_TYPEC)            += altmodes/
 obj-$(CONFIG_TYPEC_TCPM)       += tcpm/
 obj-$(CONFIG_TYPEC_UCSI)       += ucsi/


Thanks,

-- 
heikki