[DO,NOT,APPLY,v5,9/9] tools/poeg: Add test app for poeg

diff --git a/tools/poeg/Build b/tools/poeg/Build
new file mode 100644
index 000000000000..f960920a4afb
--- /dev/null
+++ b/tools/poeg/Build
@@ -0,0 +1 @@ 
+poeg_app-y += poeg_app.o
diff --git a/tools/poeg/Makefile b/tools/poeg/Makefile
new file mode 100644
index 000000000000..6946e6956215
--- /dev/null
+++ b/tools/poeg/Makefile
@@ -0,0 +1,53 @@ 
+# SPDX-License-Identifier: GPL-2.0
+include ../scripts/Makefile.include
+
+bindir ?= /usr/bin
+
+ifeq ($(srctree),)
+srctree := $(patsubst %/,%,$(dir $(CURDIR)))
+srctree := $(patsubst %/,%,$(dir $(srctree)))
+endif
+
+# Do not use make's built-in rules
+# (this improves performance and avoids hard-to-debug behaviour);
+MAKEFLAGS += -r
+
+override CFLAGS += -O2 -Wall -g -D_GNU_SOURCE -I$(OUTPUT)include
+
+ALL_TARGETS := poeg_app
+ALL_PROGRAMS := $(patsubst %,$(OUTPUT)%,$(ALL_TARGETS))
+
+all: $(ALL_PROGRAMS)
+
+export srctree OUTPUT CC LD CFLAGS
+include $(srctree)/tools/build/Makefile.include
+
+#
+# We need the following to be outside of kernel tree
+#
+$(OUTPUT)include/linux/poeg.h: ../../include/linux/soc/renesas/rzg2l-poeg.h
+	mkdir -p $(OUTPUT)include/linux 2>&1 || true
+	ln -sf $(CURDIR)/../../include/linux/soc/renesas/rzg2l-poeg.h $@
+
+prepare: $(OUTPUT)include/linux/poeg.h
+
+COUNTER_EXAMPLE := $(OUTPUT)poeg_app.o
+$(COUNTER_EXAMPLE): prepare FORCE
+	$(Q)$(MAKE) $(build)=poeg_app
+$(OUTPUT)poeg_app: $(COUNTER_EXAMPLE)
+	$(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) $< -o $@
+
+clean:
+	rm -f $(ALL_PROGRAMS)
+	rm -rf $(OUTPUT)include/linux/counter.h
+	find $(or $(OUTPUT),.) -name '*.o' -delete -o -name '\.*.d' -delete
+
+install: $(ALL_PROGRAMS)
+	install -d -m 755 $(DESTDIR)$(bindir);		\
+	for program in $(ALL_PROGRAMS); do		\
+		install $$program $(DESTDIR)$(bindir);	\
+	done
+
+FORCE:
+
+.PHONY: all install clean FORCE prepare
diff --git a/tools/poeg/poeg_app.c b/tools/poeg/poeg_app.c
new file mode 100644
index 000000000000..79cacb8c60c5
--- /dev/null
+++ b/tools/poeg/poeg_app.c
@@ -0,0 +1,60 @@ 
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * POEG - example userspace application
+ * Copyright (C) 2022 Biju Das
+ */
+#include <stdio.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/ioctl.h>
+#include <linux/ioctl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <poll.h>
+
+#include <linux/poeg.h>
+
+int main(int argc, char *arg[])
+{
+	struct poeg_event event_data;
+	unsigned int val;
+	int ret, fd, i;
+
+	fd = open("/dev/poeg3", O_RDWR);
+	if (fd < 0)
+		perror("open");
+	else
+		printf("[POEG]open\n");
+
+	for (;;) {
+		ret = read(fd, &event_data, sizeof(event_data));
+		if (ret == -1) {
+			perror("Failed to read event data");
+			return 1;
+		}
+
+		val = event_data.gpt_disable_irq_status;
+		if (val) {
+			/* emulate fault clearing condition by adding delay */
+			sleep(2);
+			for (i = 0; i < 8; i++) {
+				if (val & 7) {
+					printf("gpt ch:%u, irq=%x\n", i, val & 7);
+					ret = write(fd, &event_data, sizeof(event_data));
+				}
+				val >>= 3;
+			}
+		}
+	}
+
+	if (close(fd) != 0)
+		perror("close");
+	else
+		printf("[POEG]close\n");
+
+	return 0;
+}