ti-gfx: systemd support

The startup script too complex to embed it completely into the
.service file, so it is left as a standalone script.

[Thomas:
 - use relative path for the symbolic link
 - slightly tweak the service Description string]

Signed-off-by: Alex Suykov <alex.suykov@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/ti-gfx/ti-gfx.mk

@@ -190,6 +190,16 @@ define TI_GFX_INSTALL_INIT_SYSV
 		$(TARGET_DIR)/etc/init.d/S80ti-gfx
 endef
 
+define TI_GFX_INSTALL_INIT_SYSTEMD
+	$(INSTALL) -D -m 755 package/ti-gfx/S80ti-gfx \
+		$(TARGET_DIR)/usr/lib/systemd/scripts/ti-gfx
+	$(INSTALL) -D -m 644 package/ti-gfx/ti-gfx.service \
+		$(TARGET_DIR)/usr/lib/systemd/system/ti-gfx.service
+	mkdir -p $(TARGET_DIR)/etc/systemd/system/multi-user.target.wants
+	ln -sf ../../../../usr/lib/systemd/system/ti-gfx.service \
+		$(TARGET_DIR)/etc/systemd/system/multi-user.target.wants/ti-gfx.service
+endef
+
 define TI_GFX_INSTALL_TARGET_CMDS
 	$(TI_GFX_INSTALL_KM_CMDS)
 	$(TI_GFX_INSTALL_BINS_CMDS)

package/ti-gfx/ti-gfx.service

@@ -0,0 +1,11 @@
+[Unit]
+Description=TI graphics driver
+
+[Service]
+Type=oneshot
+ExecStart=/usr/lib/systemd/scripts/ti-gfx start
+ExecStop=/usr/lib/systemd/scripts/ti-gfx stop
+RemainAfterExit=yes
+
+[Install]
+WantedBy=multi-user.target