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Merge tag 'pwm/duty_offset-for-6.13-rc1' of https://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux

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pwm: Support for duty_offset

Support a new abstraction for pwm configuration that allows to specify
the time between start of period and the raising edge of the signal
("duty offset").

This is used in a patch series by Trevor Gamblin for triggering an ADC
conversion and afterwards read out the result. See
https://lore.kernel.org/linux-iio/20240909-ad7625_r1-v5-0-60a397768b25@baylibre.com/
for more details.
This commit is contained in:
Uwe Kleine-König
2024-10-25 11:41:46 +02:00
parent 22f032c790 9c918959e1
commit acf2b31489
5 changed files with 1389 additions and 428 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/trace/events/pwm.h
+126 -8
View File
@@ -8,15 +8,135 @@
#include <linux/pwm.h>
#include <linux/tracepoint.h>
#define TP_PROTO_pwm(args...) \
TP_PROTO(struct pwm_device *pwm, args)
#define TP_ARGS_pwm(args...) \
TP_ARGS(pwm, args)
#define TP_STRUCT__entry_pwm(args...) \
TP_STRUCT__entry( \
__field(unsigned int, chipid) \
__field(unsigned int, hwpwm) \
args)
#define TP_fast_assign_pwm(args...) \
TP_fast_assign( \
__entry->chipid = pwm->chip->id; \
__entry->hwpwm = pwm->hwpwm; \
args)
#define TP_printk_pwm(fmt, args...) \
TP_printk("pwmchip%u.%u: " fmt, __entry->chipid, __entry->hwpwm, args)
#define __field_pwmwf(wf) \
__field(u64, wf ## _period_length_ns) \
__field(u64, wf ## _duty_length_ns) \
__field(u64, wf ## _duty_offset_ns) \
#define fast_assign_pwmwf(wf) \
__entry->wf ## _period_length_ns = wf->period_length_ns; \
__entry->wf ## _duty_length_ns = wf->duty_length_ns; \
__entry->wf ## _duty_offset_ns = wf->duty_offset_ns
#define printk_pwmwf_format(wf) \
"%lld/%lld [+%lld]"
#define printk_pwmwf_formatargs(wf) \
__entry->wf ## _duty_length_ns, __entry->wf ## _period_length_ns, __entry->wf ## _duty_offset_ns
TRACE_EVENT(pwm_round_waveform_tohw,
TP_PROTO_pwm(const struct pwm_waveform *wf, void *wfhw, int err),
TP_ARGS_pwm(wf, wfhw, err),
TP_STRUCT__entry_pwm(
__field_pwmwf(wf)
__field(void *, wfhw)
__field(int, err)
),
TP_fast_assign_pwm(
fast_assign_pwmwf(wf);
__entry->wfhw = wfhw;
__entry->err = err;
),
TP_printk_pwm(printk_pwmwf_format(wf) " > %p err=%d",
printk_pwmwf_formatargs(wf), __entry->wfhw, __entry->err)
);
TRACE_EVENT(pwm_round_waveform_fromhw,
TP_PROTO_pwm(const void *wfhw, struct pwm_waveform *wf, int err),
TP_ARGS_pwm(wfhw, wf, err),
TP_STRUCT__entry_pwm(
__field(const void *, wfhw)
__field_pwmwf(wf)
__field(int, err)
),
TP_fast_assign_pwm(
__entry->wfhw = wfhw;
fast_assign_pwmwf(wf);
__entry->err = err;
),
TP_printk_pwm("%p > " printk_pwmwf_format(wf) " err=%d",
__entry->wfhw, printk_pwmwf_formatargs(wf), __entry->err)
);
TRACE_EVENT(pwm_read_waveform,
TP_PROTO_pwm(void *wfhw, int err),
TP_ARGS_pwm(wfhw, err),
TP_STRUCT__entry_pwm(
__field(void *, wfhw)
__field(int, err)
),
TP_fast_assign_pwm(
__entry->wfhw = wfhw;
__entry->err = err;
),
TP_printk_pwm("%p err=%d",
__entry->wfhw, __entry->err)
);
TRACE_EVENT(pwm_write_waveform,
TP_PROTO_pwm(const void *wfhw, int err),
TP_ARGS_pwm(wfhw, err),
TP_STRUCT__entry_pwm(
__field(const void *, wfhw)
__field(int, err)
),
TP_fast_assign_pwm(
__entry->wfhw = wfhw;
__entry->err = err;
),
TP_printk_pwm("%p err=%d",
__entry->wfhw, __entry->err)
);
DECLARE_EVENT_CLASS(pwm,
TP_PROTO(struct pwm_device *pwm, const struct pwm_state *state, int err),
TP_ARGS(pwm, state, err),
TP_STRUCT__entry(
__field(unsigned int, chipid)
__field(unsigned int, hwpwm)
TP_STRUCT__entry_pwm(
__field(u64, period)
__field(u64, duty_cycle)
__field(enum pwm_polarity, polarity)
@@ -24,9 +144,7 @@ DECLARE_EVENT_CLASS(pwm,
__field(int, err)
),
TP_fast_assign(
__entry->chipid = pwm->chip->id;
__entry->hwpwm = pwm->hwpwm;
TP_fast_assign_pwm(
__entry->period = state->period;
__entry->duty_cycle = state->duty_cycle;
__entry->polarity = state->polarity;
@@ -34,8 +152,8 @@ DECLARE_EVENT_CLASS(pwm,
__entry->err = err;
),
TP_printk("pwmchip%u.%u: period=%llu duty_cycle=%llu polarity=%d enabled=%d err=%d",
__entry->chipid, __entry->hwpwm, __entry->period, __entry->duty_cycle,
TP_printk_pwm("period=%llu duty_cycle=%llu polarity=%d enabled=%d err=%d",
__entry->period, __entry->duty_cycle,
__entry->polarity, __entry->enabled, __entry->err)
);