diff --git a/share/man/man9/pwmbus.9 b/share/man/man9/pwmbus.9
--- a/share/man/man9/pwmbus.9
+++ b/share/man/man9/pwmbus.9
@@ -22,7 +22,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd June 21, 2019
+.Dd March 9, 2021
 .Dt PWMBUS 9
 .Os
 .Sh NAME
@@ -40,19 +40,19 @@
 .Cd "device pwm"
 .In "pwmbus_if.h"
 .Ft int
-.Fn PWMBUS_CHANNEL_CONFIG "device_t bus" "int channel" "uint64_t period" "uint64_t duty"
+.Fn PWMBUS_CHANNEL_CONFIG "device_t bus" "u_int channel" "u_int period" "u_int duty"
 .Ft int
-.Fn PWMBUS_CHANNEL_COUNT "device_t bus" "int channel" "int *nchannel"
+.Fn PWMBUS_CHANNEL_COUNT "device_t bus" "u_int *nchannel"
 .Ft int
-.Fn PWMBUS_CHANNEL_ENABLE "device_t bus" "int channel" "bool enable"
+.Fn PWMBUS_CHANNEL_ENABLE "device_t bus" "u_int channel" "bool enable"
 .Ft int
-.Fn PWMBUS_CHANNEL_GET_CONFIG "device_t bus" "int channel" "uint64_t *period" "uint64_t *duty"
+.Fn PWMBUS_CHANNEL_GET_CONFIG "device_t bus" "u_int channel" "u_int *period" "u_int *duty"
 .Ft int
-.Fn PWMBUS_CHANNEL_GET_FLAGS "device_t bus" "int channel" "uint32_t *flags"
+.Fn PWMBUS_CHANNEL_GET_FLAGS "device_t bus" "u_int channel" "uint32_t *flags"
 .Ft int
-.Fn PWMBUS_CHANNEL_IS_ENABLED "device_t bus" "int channel" "bool *enabled"
+.Fn PWMBUS_CHANNEL_IS_ENABLED "device_t bus" "u_int channel" "bool *enabled"
 .Ft int
-.Fn PWMBUS_CHANNEL_SET_FLAGS "device_t bus" "int channel" "uint32_t flags"
+.Fn PWMBUS_CHANNEL_SET_FLAGS "device_t bus" "u_int channel" "uint32_t flags"
 .Sh DESCRIPTION
 The PWMBUS (Pulse-Width Modulation) interface allows a device driver to
 register to a global bus so other devices in the kernel can use them in a
@@ -76,7 +76,7 @@
 details on channels that share resources.
 .Sh INTERFACE
 .Bl -tag -width indent
-.It Fn PWMBUS_CHANNEL_CONFIG "device_t bus" "int channel" "uint64_t period" "uint64_t duty"
+.It Fn PWMBUS_CHANNEL_CONFIG "device_t bus" "u_int channel" "u_int period" "u_int duty"
 Configure the period and duty (in nanoseconds) in the PWM controller on the bus
 for the specified channel.
 Returns 0 on success or
@@ -85,19 +85,19 @@
 .Er EBUSY
 if the PWMBUS controller is in use and does not support changing the value on
 the fly.
-.It Fn PWMBUS_CHANNEL_COUNT "device_t bus" "int *nchannel"
+.It Fn PWMBUS_CHANNEL_COUNT "device_t bus" "u_int *nchannel"
 Get the number of channels supported by the controller.
-.It Fn PWMBUS_CHANNEL_ENABLE "device_t bus" "int channel" "bool enable"
+.It Fn PWMBUS_CHANNEL_ENABLE "device_t bus" "u_int channel" "bool enable"
 Enable the PWM channel.
-.It Fn PWMBUS_CHANNEL_GET_CONFIG "device_t bus" "int channel" "uint64_t *period" "uint64_t *duty"
+.It Fn PWMBUS_CHANNEL_GET_CONFIG "device_t bus" "u_int channel" "u_int *period" "u_int *duty"
 Get the current configuration of the period and duty for the specified channel.
-.It Fn PWMBUS_CHANNEL_GET_FLAGS "device_t bus" "int channel" "uint32_t *flags"
+.It Fn PWMBUS_CHANNEL_GET_FLAGS "device_t bus" "u_int channel" "uint32_t *flags"
 Get the current flags for the channel.
 If the driver or controller
 does not support this, a default method returns a flags value of zero.
-.It Fn PWMBUS_CHANNEL_IS_ENABLED "device_t bus" "int channel" "bool *enable"
+.It Fn PWMBUS_CHANNEL_IS_ENABLED "device_t bus" "u_int channel" "bool *enable"
 Test whether the PWM channel is enabled.
-.It Fn PWMBUS_CHANNEL_SET_FLAGS "device_t bus" "int channel" "uint32_t flags"
+.It Fn PWMBUS_CHANNEL_SET_FLAGS "device_t bus" "u_int channel" "uint32_t flags"
 Set the flags of the channel (such as inverted polarity).
 If the driver or controller does not support this a do-nothing default method
 is used.
diff --git a/sys/dev/pwm/pwmbus_if.m b/sys/dev/pwm/pwmbus_if.m
--- a/sys/dev/pwm/pwmbus_if.m
+++ b/sys/dev/pwm/pwmbus_if.m
@@ -33,14 +33,14 @@
 
 CODE {
 	static int
-	pwm_default_set_flags(device_t dev, u_int channel, uint32_t flags)
+	pwm_default_set_flags(device_t bus, u_int channel, uint32_t flags)
 	{
 
 		return (EOPNOTSUPP);
 	}
 
 	static int
-	pwm_default_get_flags(device_t dev, u_int channel, uint32_t *flags)
+	pwm_default_get_flags(device_t bus, u_int channel, uint32_t *flags)
 	{
 
 		*flags = 0;
@@ -55,8 +55,8 @@
 METHOD int channel_config {
 	device_t bus;
 	u_int channel;
-	unsigned int period;
-	unsigned int duty;
+	u_int period;
+	u_int duty;
 };
 
 #
@@ -66,8 +66,8 @@
 METHOD int channel_get_config {
 	device_t bus;
 	u_int channel;
-	unsigned int *period;
-	unsigned int *duty;
+	u_int *period;
+	u_int *duty;
 };
 
 #
@@ -83,7 +83,7 @@
 # Get the flags
 #
 METHOD int channel_get_flags {
-	device_t dev;
+	device_t bus;
 	u_int channel;
 	uint32_t *flags;
 } DEFAULT pwm_default_get_flags;