@@ -20,6 +20,9 @@
#include <dt-bindings/pwm/pwm.h>
+#define CREATE_TRACE_POINTS
+#include <trace/events/pwm.h>
+
#define MAX_PWMS 1024
static DEFINE_MUTEX(pwm_lookup_lock);
@@ -283,8 +286,10 @@ int pwmchip_add_with_polarity(struct pwm_chip *chip,
pwm->hwpwm = i;
pwm->state.polarity = polarity;
- if (chip->ops->get_state)
+ if (chip->ops->get_state) {
chip->ops->get_state(chip, pwm, &pwm->state);
+ trace_pwm_get(pwm, &pwm->state);
+ }
radix_tree_insert(&pwm_tree, pwm->pwm, pwm);
}
@@ -472,6 +477,8 @@ int pwm_apply_state(struct pwm_device *pwm, const struct pwm_state *state)
if (err)
return err;
+ trace_pwm_apply(pwm, state);
+
/*
* .apply might have to round some values in *state, if possible
* read the actually implemented value back.
new file mode 100644
@@ -0,0 +1,58 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM pwm
+
+#if !defined(_TRACE_PWM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_PWM_H
+
+#include <linux/pwm.h>
+#include <linux/tracepoint.h>
+
+DECLARE_EVENT_CLASS(pwm,
+
+ TP_PROTO(struct pwm_device *pwm, const struct pwm_state *state),
+
+ TP_ARGS(pwm, state),
+
+ TP_STRUCT__entry(
+ __field(struct pwm_device *, pwm)
+ __field(u64, period)
+ __field(u64, duty_cycle)
+ __field(enum pwm_polarity, polarity)
+ __field(bool, enabled)
+ ),
+
+ TP_fast_assign(
+ __entry->pwm = pwm;
+ __entry->period = state->period;
+ __entry->duty_cycle = state->duty_cycle;
+ __entry->polarity = state->polarity;
+ __entry->enabled = state->enabled;
+ ),
+
+ TP_printk("%p: period=%llu duty_cycle=%llu polarity=%d enabled=%d",
+ __entry->pwm, __entry->period, __entry->duty_cycle,
+ __entry->polarity, __entry->enabled)
+
+);
+
+DEFINE_EVENT(pwm, pwm_apply,
+
+ TP_PROTO(struct pwm_device *pwm, const struct pwm_state *state),
+
+ TP_ARGS(pwm, state)
+
+);
+
+DEFINE_EVENT(pwm, pwm_get,
+
+ TP_PROTO(struct pwm_device *pwm, const struct pwm_state *state),
+
+ TP_ARGS(pwm, state)
+
+);
+
+#endif /* _TRACE_PWM_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
This allows to log all calls to the driver's lowlevel functions which simplifies debugging in some cases. Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de> --- Hello, I didn't add a trace call to .get_state added in 01ccf903edd6 ("pwm: Let pwm_get_state() return the last implemented state") in the expectation that this will be reverted very soon anyhow and addint it there would only complicate reverting (or applying this patch). Best regards Uwe drivers/pwm/core.c | 9 +++++- include/trace/events/pwm.h | 58 ++++++++++++++++++++++++++++++++++++++ 2 files changed, 66 insertions(+), 1 deletion(-) create mode 100644 include/trace/events/pwm.h