From aa12c7e70319c9746e55e5b00a215119ba838dad Mon Sep 17 00:00:00 2001 From: =?utf8?q?Uwe=20Kleine-K=C3=B6nig?= Date: Fri, 21 Nov 2025 11:49:48 +0100 Subject: [PATCH] pwm: Emit native configuration in /sys/kernel/debug/pwm MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Link: https://patch.msgid.link/20251121104947.2652013-2-u.kleine-koenig@baylibre.com Signed-off-by: Uwe Kleine-König --- drivers/pwm/core.c | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-) diff --git a/drivers/pwm/core.c b/drivers/pwm/core.c index ec8731515333a..41fd3a9b28837 100644 --- a/drivers/pwm/core.c +++ b/drivers/pwm/core.c @@ -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"); } -- 2.47.3