dm: core: Allow sequence alias support to be removed for SPL

In many cases SPL only uses a single serial port and there is no need for
alias sequence support. We will just use the serial port pointed to by
stdout-path in the /chosen node.

Signed-off-by: Simon Glass <sjg@chromium.org>

drivers/core/Kconfig

@@ -46,3 +46,12 @@ config DM_STDIO
 	  Normally serial drivers register with stdio so that they can be used
 	  as normal output devices. In SPL we don't normally use stdio, so
 	  we can omit this feature.
+
+config DM_SEQ_ALIAS
+	bool "Support numbered aliases in device tree"
+	depends on DM
+	default y
+	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.

drivers/core/device.c

@@ -56,21 +56,23 @@ int device_bind(struct udevice *parent, const struct driver *drv,
 
 	dev->seq = -1;
 	dev->req_seq = -1;
-#ifdef CONFIG_OF_CONTROL
-	/*
-	 * Some devices, such as a SPI bus, I2C bus and serial ports are
-	 * numbered using aliases.
-	 *
-	 * This is just a 'requested' sequence, and will be
-	 * resolved (and ->seq updated) when the device is probed.
-	 */
-	if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
-		if (uc->uc_drv->name && of_offset != -1) {
-			fdtdec_get_alias_seq(gd->fdt_blob, uc->uc_drv->name,
-					     of_offset, &dev->req_seq);
+	if (IS_ENABLED(CONFIG_OF_CONTROL) && IS_ENABLED(CONFIG_DM_SEQ_ALIAS)) {
+		/*
+		* Some devices, such as a SPI bus, I2C bus and serial ports
+		* are numbered using aliases.
+		*
+		* This is just a 'requested' sequence, and will be
+		* resolved (and ->seq updated) when the device is probed.
+		*/
+		if (uc->uc_drv->flags & DM_UC_FLAG_SEQ_ALIAS) {
+			if (uc->uc_drv->name && of_offset != -1) {
+				fdtdec_get_alias_seq(gd->fdt_blob,
+						uc->uc_drv->name, of_offset,
+						&dev->req_seq);
+			}
 		}
 	}
-#endif
+
 	if (!dev->platdata && drv->platdata_auto_alloc_size) {
 		dev->flags |= DM_FLAG_ALLOC_PDATA;
 		dev->platdata = calloc(1, drv->platdata_auto_alloc_size);

include/config_uncmd_spl.h

@@ -31,6 +31,7 @@
 
 #undef CONFIG_DM_WARN
 #undef CONFIG_DM_DEVICE_REMOVE
+#undef CONFIG_DM_SEQ_ALIAS
 #undef CONFIG_DM_STDIO
 
 #endif /* CONFIG_SPL_BUILD */