package/linux-tools: add gpio

Signed-off-by: Marcin Niestroj <m.niestroj@grinn-global.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/linux-tools/Config.in

@@ -20,6 +20,18 @@ comment "cpupower needs a toolchain w/ wchar"
 	depends on !BR2_bfin
 	depends on !BR2_USE_WCHAR && BR2_NEEDS_GETTEXT
 
+config BR2_PACKAGE_LINUX_TOOLS_GPIO
+	bool "gpio"
+	select BR2_PACKAGE_LINUX_TOOLS
+	help
+	  gpio is a collection of tools to get information about,
+	  control and monitor gpios present on system.
+
+	  These tools use new gpio ABI which will deprecate sysfs gpio
+	  interface in the future.
+
+	  These tools are available only from kernel version 4.8.
+
 config BR2_PACKAGE_LINUX_TOOLS_PERF
 	bool "perf"
 	select BR2_PACKAGE_LINUX_TOOLS

package/linux-tools/linux-tool-gpio.mk

@@ -0,0 +1,28 @@
+################################################################################
+#
+# gpio
+#
+################################################################################
+
+LINUX_TOOLS += gpio
+
+GPIO_MAKE_OPTS = $(LINUX_MAKE_FLAGS)
+
+define GPIO_BUILD_CMDS
+	$(Q)if ! grep install $(LINUX_DIR)/tools/gpio/Makefile >/dev/null 2>&1 ; then \
+		echo "Your kernel version is too old and does not have the gpio tools." ; \
+		echo "At least kernel 4.8 must be used." ; \
+		exit 1 ; \
+	fi
+
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(LINUX_DIR)/tools \
+		$(GPIO_MAKE_OPTS) \
+		gpio
+endef
+
+define GPIO_INSTALL_TARGET_CMDS
+	$(TARGET_MAKE_ENV) $(MAKE) -C $(LINUX_DIR)/tools \
+		$(GPIO_MAKE_OPTS) \
+		DESTDIR=$(TARGET_DIR) \
+		gpio_install
+endef