spl: dm: Add SPL_DM_SEQ_ALIAS config option

The Device Model sequence alias feature is required by some Uclasses.
Instead of disabling the feature for all SPL targets allow it to be
configured.

The config option is disabled by default to reduce code size for targets
that are not interested or do not require this feature.

Signed-off-by: Nathan Rossi <nathan@nathanrossi.com>
Acked-by: Simon Glass <sjg@chromium.org>
Acked-by: Michal Simek <michal.simek@xilinx.com>
Cc: Simon Glass <sjg@chromium.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Marek Vasut <marex@denx.de>
Cc: Michal Simek <michal.simek@xilinx.com>
Cc: Stefan Roese <sr@denx.de>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>

drivers/core/Kconfig

@@ -60,6 +60,15 @@ config DM_SEQ_ALIAS
 	help
 	  Most boards will have a '/aliases' node containing the path to
 	  numbered devices (e.g. serial0 = &serial0). This feature can be
+	  disabled if it is not required.
+
+config SPL_DM_SEQ_ALIAS
+	bool "Support numbered aliases in device tree in SPL"
+	depends on DM
+	default n
+	help
+	  Most boards will have a '/aliases' node containing the path to
+	  numbered devices (e.g. serial0 = &serial0). This feature can be
 	  disabled if it is not required, to save code space in SPL.
 
 config REGMAP

drivers/core/device.c

@@ -64,7 +64,7 @@ int device_bind(struct udevice *parent, const struct driver *drv,
 
 	dev->seq = -1;
 	dev->req_seq = -1;
-	if (CONFIG_IS_ENABLED(OF_CONTROL) && IS_ENABLED(CONFIG_DM_SEQ_ALIAS)) {
+	if (CONFIG_IS_ENABLED(OF_CONTROL) && CONFIG_IS_ENABLED(DM_SEQ_ALIAS)) {
 		/*
 		* Some devices, such as a SPI bus, I2C bus and serial ports
 		* are numbered using aliases.

include/config_uncmd_spl.h

@@ -29,7 +29,6 @@
 #endif
 
 #undef CONFIG_DM_WARN
-#undef CONFIG_DM_SEQ_ALIAS
 #undef CONFIG_DM_STDIO
 
 #endif /* CONFIG_SPL_BUILD */