spl: dm: use CONFIG_IS_ENABLED to test for the DM option

Even though there's now a TPL_DM configuration option, the spl logic
still checks for SPL_DM and thus does not pick up the proper config
option.

This introduces the use of CONFIG_IS_ENABLED(DM) in spl.c to always
pick up the desired configuration option instead of having a
hard-coded check for the SPL variant.

Signed-off-by: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>

common/spl/spl.c

@@ -6,6 +6,7 @@
  *
  * SPDX-License-Identifier:	GPL-2.0+
  */
+
 #include <common.h>
 #include <dm.h>
 #include <spl.h>
@@ -243,7 +244,7 @@ static int spl_common_init(bool setup_malloc)
 			return ret;
 		}
 	}
-	if (IS_ENABLED(CONFIG_SPL_DM)) {
+	if (CONFIG_IS_ENABLED(DM)) {
 		bootstage_start(BOOTSTATE_ID_ACCUM_DM_SPL, "dm_spl");
 		/* With CONFIG_SPL_OF_PLATDATA, bring in all devices */
 		ret = dm_init_and_scan(!CONFIG_IS_ENABLED(OF_PLATDATA));
@@ -424,7 +425,7 @@ void board_init_r(gd_t *dummy1, ulong dummy2)
 	      gd->malloc_ptr / 1024);
 #endif
 
-	if (IS_ENABLED(CONFIG_SPL_ATF_SUPPORT)) {
+	if (CONFIG_IS_ENABLED(ATF_SUPPORT)) {
 		debug("loaded - jumping to U-Boot via ATF BL31.\n");
 		bl31_entry();
 	}

include/linux/kconfig.h

@@ -51,12 +51,25 @@
 #define _IS_SPL 1
 #endif
 
+#ifdef CONFIG_TPL_BUILD
+#define _IS_TPL 1
+#endif
+
+#if defined(CONFIG_TPL_BUILD)
+#define config_val(cfg) _config_val(_IS_TPL, cfg)
+#define _config_val(x, cfg) __config_val(x, cfg)
+#define __config_val(x, cfg) ___config_val(__ARG_PLACEHOLDER_##x, cfg)
+#define ___config_val(arg1_or_junk, cfg)  \
+	____config_val(arg1_or_junk CONFIG_TPL_##cfg, CONFIG_##cfg)
+#define ____config_val(__ignored, val, ...) val
+#else
 #define config_val(cfg) _config_val(_IS_SPL, cfg)
 #define _config_val(x, cfg) __config_val(x, cfg)
 #define __config_val(x, cfg) ___config_val(__ARG_PLACEHOLDER_##x, cfg)
 #define ___config_val(arg1_or_junk, cfg)  \
 	____config_val(arg1_or_junk CONFIG_SPL_##cfg, CONFIG_##cfg)
 #define ____config_val(__ignored, val, ...) val
+#endif
 
 /*
  * CONFIG_VAL(FOO) evaluates to the value of