meta-digi: do not enable spidev when touch is enabled

They conflict.

Warn the user about the problem and let they change the device tree
manually.

https://jira.digi.com/browse/DEL-840

Signed-off-by: Javier Viguera <javier.viguera@digi.com>

meta-digi-arm/recipes-kernel/linux/linux-dey_3.10.bb

@@ -65,11 +65,14 @@ do_update_dts() {
 		config_dts disable '_ssp1_'
 		config_dts disable '_auart1_4wires'
 		config_dts disable '_ethernet0_leds'
-	fi
+	else
+		# spidev conflicts with touchscreen, thus enable it only
+		# when touch is disabled
 		if [ -n "${HAVE_EXAMPLE}" ]; then
 			config_dts enable 'ssp1_spi_gpio.dtsi'
 			config_dts enable 'ssp1_spi_gpio_spidev.dtsi'
 		fi
+	fi
 }
 addtask update_dts before do_install after do_sizecheck
 

meta-digi-dey/recipes-digi/dey-examples/dey-examples-spidev.bb

@@ -11,6 +11,13 @@ SRC_URI = "file://spidev_test"
 
 S = "${WORKDIR}/spidev_test"
 
+# Warn the user in case we cannot enable spidev in the device tree
+python do_warning_spidev() {
+    if d.getVar('HAVE_GUI', True) and not d.getVar('IS_KERNEL_2X', True):
+        bb.warn("SPIDEV conflicts with touchscreen so it was not enabled in the device tree")
+}
+addtask warning_spidev before do_compile
+
 do_compile() {
 	${CC} -O2 -Wall spidev_test.c -o spidev_test
 }