tests: add a positive gpio test case

Ensure that properly named properties don't trigger warnings

Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com>
Message-Id: <20210504035944.8453-5-ilya.lipnitskiy@gmail.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

tests/good-gpio.dts

@@ -0,0 +1,12 @@
+/dts-v1/;
+
+/ {
+	gpio: gpio-controller {
+		#gpio-cells = <3>;
+	};
+
+	node {
+		foo,nr-gpios = <1>;
+		foo-gpios = <&gpio 1 2 3>;
+	};
+};

tests/run_tests.sh

@@ -709,10 +709,12 @@ dtc_tests () {
     check_tests "$SRCDIR/unit-addr-unique.dts" unique_unit_address
     check_tests "$SRCDIR/bad-phandle-cells.dts" interrupts_extended_property
     check_tests "$SRCDIR/bad-gpio.dts" gpios_property
+    check_tests "$SRCDIR/good-gpio.dts" -n gpios_property
     check_tests "$SRCDIR/bad-graph.dts" graph_child_address
     check_tests "$SRCDIR/bad-graph.dts" graph_port
     check_tests "$SRCDIR/bad-graph.dts" graph_endpoint
     run_sh_test "$SRCDIR/dtc-checkfails.sh" deprecated_gpio_property -- -Wdeprecated_gpio_property -I dts -O dtb "$SRCDIR/bad-gpio.dts"
+    run_sh_test "$SRCDIR/dtc-checkfails.sh" -n deprecated_gpio_property -- -Wdeprecated_gpio_property -I dts -O dtb "$SRCDIR/good-gpio.dts"
     check_tests "$SRCDIR/bad-interrupt-cells.dts" interrupts_property
     check_tests "$SRCDIR/bad-interrupt-controller.dts" interrupt_provider
     run_sh_test "$SRCDIR/dtc-checkfails.sh" node_name_chars -- -I dtb -O dtb bad_node_char.dtb