pwm: Add actual hardware state to pwm debugfs file

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 <[email protected]>
Reviewed-by: Trevor Gamblin <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Uwe Kleine-König <[email protected]>

Author: ukleinek

drivers/pwm/core.c

@@ -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");
 	}