treewide: fdt: Move fdt_get_config_... to ofnode_conf_read...

The current API is outdated as it requires a devicetree pointer.

Move these functions to use the ofnode API and update this globally. Add
some tests while we are here.

Correct the call in exynos_dsim_config_parse_dt() which is obviously
wrong.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/common/autoboot.c b/common/autoboot.c
index 5bb2e19..6251c68 100644
--- a/common/autoboot.c
+++ b/common/autoboot.c
@@ -24,6 +24,7 @@
 #include <u-boot/sha256.h>
 #include <bootcount.h>
 #include <crypt.h>
+#include <dm/ofnode.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -424,12 +425,12 @@
 	ulong addr;
 
 	/* Add an env variable to point to a kernel payload, if available */
-	addr = fdtdec_get_config_int(gd->fdt_blob, "kernel-offset", 0);
+	addr = ofnode_conf_read_int("kernel-offset", 0);
 	if (addr)
 		env_set_addr("kernaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
 
 	/* Add an env variable to point to a root disk, if available */
-	addr = fdtdec_get_config_int(gd->fdt_blob, "rootdisk-offset", 0);
+	addr = ofnode_conf_read_int("rootdisk-offset", 0);
 	if (addr)
 		env_set_addr("rootaddr", (void *)(CONFIG_SYS_TEXT_BASE + addr));
 #endif /* CONFIG_SYS_TEXT_BASE */
@@ -446,8 +447,7 @@
 	bootdelay = s ? (int)simple_strtol(s, NULL, 10) : CONFIG_BOOTDELAY;
 
 	if (IS_ENABLED(CONFIG_OF_CONTROL))
-		bootdelay = fdtdec_get_config_int(gd->fdt_blob, "bootdelay",
-						  bootdelay);
+		bootdelay = ofnode_conf_read_int("bootdelay", bootdelay);
 
 	debug("### main_loop entered: bootdelay=%d\n\n", bootdelay);
 
diff --git a/common/board_r.c b/common/board_r.c
index 0cbe5f7..31a59c5 100644
--- a/common/board_r.c
+++ b/common/board_r.c
@@ -67,6 +67,7 @@
 #endif
 #include <asm/sections.h>
 #include <dm/root.h>
+#include <dm/ofnode.h>
 #include <linux/compiler.h>
 #include <linux/err.h>
 #include <efi_loader.h>
@@ -448,8 +449,7 @@
 static int should_load_env(void)
 {
 	if (IS_ENABLED(CONFIG_OF_CONTROL))
-		return fdtdec_get_config_int(gd->fdt_blob,
-						"load-environment", 1);
+		return ofnode_conf_read_int("load-environment", 1);
 
 	if (IS_ENABLED(CONFIG_DELAY_ENVIRONMENT))
 		return 0;
diff --git a/common/cli.c b/common/cli.c
index 048eacb..d86046a 100644
--- a/common/cli.c
+++ b/common/cli.c
@@ -19,8 +19,7 @@
 #include <hang.h>
 #include <malloc.h>
 #include <asm/global_data.h>
-
-DECLARE_GLOBAL_DATA_PTR;
+#include <dm/ofnode.h>
 
 #ifdef CONFIG_CMDLINE
 /*
@@ -157,7 +156,7 @@
 bool cli_process_fdt(const char **cmdp)
 {
 	/* Allow the fdt to override the boot command */
-	char *env = fdtdec_get_config_string(gd->fdt_blob, "bootcmd");
+	const char *env = ofnode_conf_read_str("bootcmd");
 	if (env)
 		*cmdp = env;
 	/*
@@ -165,7 +164,7 @@
 	 * Always use 'env' in this case, since bootsecure requres that the
 	 * bootcmd was specified in the FDT too.
 	 */
-	return fdtdec_get_config_int(gd->fdt_blob, "bootsecure", 0) != 0;
+	return ofnode_conf_read_int("bootsecure", 0);
 }
 
 /*
diff --git a/common/spl/spl_spi.c b/common/spl/spl_spi.c
index 9884e7c..f92ce37 100644
--- a/common/spl/spl_spi.c
+++ b/common/spl/spl_spi.c
@@ -16,8 +16,7 @@
 #include <errno.h>
 #include <spl.h>
 #include <asm/global_data.h>
-
-DECLARE_GLOBAL_DATA_PTR;
+#include <dm/ofnode.h>
 
 #ifdef CONFIG_SPL_OS_BOOT
 /*
@@ -104,9 +103,8 @@
 	header = spl_get_load_buffer(-sizeof(*header), sizeof(*header));
 
 #if CONFIG_IS_ENABLED(OF_CONTROL) && !CONFIG_IS_ENABLED(OF_PLATDATA)
-	payload_offs = fdtdec_get_config_int(gd->fdt_blob,
-					     "u-boot,spl-payload-offset",
-					     payload_offs);
+	payload_offs = ofnode_conf_read_int("u-boot,spl-payload-offset",
+					    payload_offs);
 #endif
 
 #ifdef CONFIG_SPL_OS_BOOT