Move/rename the sys/pwm.h header file to dev/pwm/pwmc.h. The file contains

ioctl definitions and related datatypes that allow userland control of pwm
hardware via the pwmc device.  The new name and location better reflects its
assocation with a single device driver.

ObsoleteFiles.inc

@@ -38,6 +38,8 @@
 #   xargs -n1 | sort | uniq -d;
 # done
 
+# 20190615: sys/pwm.h renamed to dev/pwmc.h
+OLD_FILES+=usr/include/sys/pwm.h
 # 20190612: new clang import which bumps version from 8.0.0 to 8.0.1.
 OLD_FILES+=usr/lib/clang/8.0.0/include/sanitizer/allocator_interface.h
 OLD_FILES+=usr/lib/clang/8.0.0/include/sanitizer/asan_interface.h

etc/mtree/BSD.include.dist

@@ -152,6 +152,8 @@
         ..
         ppbus
         ..
+        pwm
+        ..
         smbus
         ..
         speaker

include/Makefile

@@ -46,8 +46,8 @@ LSUBDIRS=	cam/ata cam/mmc cam/nvme cam/scsi \
 	dev/acpica dev/agp dev/an dev/bktr dev/ciss dev/filemon dev/firewire \
 	dev/hwpmc dev/hyperv \
 	dev/ic dev/iicbus dev/io dev/mfi dev/mmc dev/nvme \
-	dev/ofw dev/pbio dev/pci ${_dev_powermac_nvram} dev/ppbus dev/smbus \
-	dev/speaker dev/tcp_log dev/veriexec dev/vkbd dev/wi \
+	dev/ofw dev/pbio dev/pci ${_dev_powermac_nvram} dev/ppbus dev/pwm \
+	dev/smbus dev/speaker dev/tcp_log dev/veriexec dev/vkbd dev/wi \
 	fs/devfs fs/fdescfs fs/msdosfs fs/nandfs fs/nfs fs/nullfs \
 	fs/procfs fs/smbfs fs/udf fs/unionfs \
 	geom/cache geom/concat geom/eli geom/gate geom/journal geom/label \

sys/dev/pwm/pwmc.c

@@ -37,7 +37,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/module.h>
 #include <sys/time.h>
 
-#include <sys/pwm.h>
+#include <dev/pwm/pwmc.h>
 
 #include "pwmbus_if.h"
 #include "pwm_if.h"

usr.sbin/pwm/pwm.c

@@ -31,8 +31,8 @@
 #include <sys/types.h>
 #include <sys/ioctl.h>
 #include <stdbool.h>
-#include <sys/pwm.h>
 #include <sys/capsicum.h>
+#include <dev/pwm/pwmc.h>
 
 #include <err.h>
 #include <errno.h>