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pwm: Add actual hardware state to pwm debugfs file

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Traditionally /sys/kernel/debug/pwm only contained info from pwm->state.
Most of the time this data represents the last requested setting which
might differ considerably from the actually configured in hardware
setting.

Expand the information in the debugfs file with the actual values.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@baylibre.com>
Reviewed-by: Trevor Gamblin <tgamblin@baylibre.com>
Link: https://lore.kernel.org/r/20250404104844.543479-2-u.kleine-koenig@baylibre.com
Signed-off-by: Uwe Kleine-König <ukleinek@kernel.org>
This commit is contained in:
Uwe Kleine-König 2025-04-04 12:48:42 +02:00 committed by Uwe Kleine-König
parent 7cfe1e208b
commit 461d68d43d
1 changed files with 11 additions and 8 deletions
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19
drivers/pwm/core.c
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@ -2221,25 +2221,28 @@ 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;
struct pwm_state state, hwstate;
pwm_get_state(pwm, &state);
pwm_get_state_hw(pwm, &hwstate);
seq_printf(s, " pwm-%-3d (%-20.20s):", i, pwm->label);
if (test_bit(PWMF_REQUESTED, &pwm->flags))
seq_puts(s, " requested");
if (state.enabled)
seq_puts(s, " enabled");
seq_puts(s, "\n");
seq_printf(s, " period: %llu ns", state.period);
seq_printf(s, " duty: %llu ns", state.duty_cycle);
seq_printf(s, " polarity: %s",
seq_printf(s, " requested configuration: %3sabled, %llu/%llu ns, %s polarity",
state.enabled ? "en" : "dis", state.duty_cycle, state.period,
state.polarity ? "inverse" : "normal");
if (state.usage_power)
seq_puts(s, " usage_power");
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");
seq_puts(s, "\n");
}