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pwm: Emit native configuration in /sys/kernel/debug/pwm

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Currently there are two abstractions for PWM drivers. Use the waveform
representation for the drivers that support it as this is more
expressive and so tells more about the actual hardware state.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Link: https://patch.msgid.link/20251121104947.2652013-2-u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
This commit is contained in:
Uwe Kleine-König
2025-11-21 11:49:48 +01:00
committed by Uwe Kleine-König
parent 85a5ffbd56
commit aa12c7e703
1 changed files with 22 additions and 5 deletions
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27
drivers/pwm/core.c
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@@ -2638,10 +2638,10 @@ static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s)
for (i = 0; i < chip->npwm; i++) {
struct pwm_device *pwm = &chip->pwms[i];
struct pwm_state state, hwstate;
struct pwm_state state;
int err;
pwm_get_state(pwm, &state);
pwm_get_state_hw(pwm, &hwstate);
seq_printf(s, " pwm-%-3d (%-20.20s):", i, pwm->label);
@@ -2657,9 +2657,26 @@ static void pwm_dbg_show(struct pwm_chip *chip, struct seq_file *s)
seq_puts(s, ", usage_power");
seq_puts(s, "\n");
seq_printf(s, " actual configuration: %3sabled, %llu/%llu ns, %s polarity",
hwstate.enabled ? "en" : "dis", hwstate.duty_cycle, hwstate.period,
hwstate.polarity ? "inverse" : "normal");
if (pwmchip_supports_waveform(chip)) {
struct pwm_waveform wf;
err = pwm_get_waveform_might_sleep(pwm, &wf);
if (!err)
seq_printf(s, " actual configuration: %lld/%lld [+%lld]",
wf.duty_length_ns, wf.period_length_ns, wf.duty_offset_ns);
else
seq_printf(s, " actual configuration: read out error: %pe\n", ERR_PTR(err));
} else {
struct pwm_state hwstate;
err = pwm_get_state_hw(pwm, &hwstate);
if (!err)
seq_printf(s, " actual configuration: %3sabled, %llu/%llu ns, %s polarity",
hwstate.enabled ? "en" : "dis", hwstate.duty_cycle, hwstate.period,
hwstate.polarity ? "inverse" : "normal");
else
seq_printf(s, " actual configuration: read out error: %pe", ERR_PTR(err));
}
seq_puts(s, "\n");
}