diff --git a/tools/dtoc/test_dtoc.py b/tools/dtoc/test_dtoc.py
index 11bead1260..cb6d6e7baf 100644
--- a/tools/dtoc/test_dtoc.py
+++ b/tools/dtoc/test_dtoc.py
@@ -196,7 +196,7 @@ struct dtd_sandbox_spl_test_2 {
         with open(output) as infile:
             data = infile.read()
         self._CheckStrings(C_HEADER + '''
-static struct dtd_sandbox_spl_test dtv_spl_test = {
+static const struct dtd_sandbox_spl_test dtv_spl_test = {
 \t.bytearray\t\t= {0x6, 0x0, 0x0},
 \t.byteval\t\t= 0x5,
 \t.intval\t\t\t= 0x1,
@@ -214,7 +214,7 @@ U_BOOT_DEVICE(spl_test) = {
 \t.platdata_size\t= sizeof(dtv_spl_test),
 };
 
-static struct dtd_sandbox_spl_test dtv_spl_test2 = {
+static const struct dtd_sandbox_spl_test dtv_spl_test2 = {
 \t.bytearray\t\t= {0x1, 0x23, 0x34},
 \t.byteval\t\t= 0x8,
 \t.intval\t\t\t= 0x3,
@@ -230,7 +230,7 @@ U_BOOT_DEVICE(spl_test2) = {
 \t.platdata_size\t= sizeof(dtv_spl_test2),
 };
 
-static struct dtd_sandbox_spl_test dtv_spl_test3 = {
+static const struct dtd_sandbox_spl_test dtv_spl_test3 = {
 \t.stringarray\t\t= {"one", "", ""},
 };
 U_BOOT_DEVICE(spl_test3) = {
@@ -239,7 +239,7 @@ U_BOOT_DEVICE(spl_test3) = {
 \t.platdata_size\t= sizeof(dtv_spl_test3),
 };
 
-static struct dtd_sandbox_spl_test_2 dtv_spl_test4 = {
+static const struct dtd_sandbox_spl_test_2 dtv_spl_test4 = {
 };
 U_BOOT_DEVICE(spl_test4) = {
 \t.name\t\t= "sandbox_spl_test_2",
@@ -247,7 +247,7 @@ U_BOOT_DEVICE(spl_test4) = {
 \t.platdata_size\t= sizeof(dtv_spl_test4),
 };
 
-static struct dtd_sandbox_i2c_test dtv_i2c_at_0 = {
+static const struct dtd_sandbox_i2c_test dtv_i2c_at_0 = {
 };
 U_BOOT_DEVICE(i2c_at_0) = {
 \t.name\t\t= "sandbox_i2c_test",
@@ -255,7 +255,7 @@ U_BOOT_DEVICE(i2c_at_0) = {
 \t.platdata_size\t= sizeof(dtv_i2c_at_0),
 };
 
-static struct dtd_sandbox_pmic_test dtv_pmic_at_9 = {
+static const struct dtd_sandbox_pmic_test dtv_pmic_at_9 = {
 \t.low_power\t\t= true,
 \t.reg\t\t\t= {0x9, 0x0},
 };
@@ -287,7 +287,7 @@ struct dtd_target {
         with open(output) as infile:
             data = infile.read()
         self._CheckStrings(C_HEADER + '''
-static struct dtd_target dtv_phandle_target = {
+static const struct dtd_target dtv_phandle_target = {
 \t.intval\t\t\t= 0x0,
 };
 U_BOOT_DEVICE(phandle_target) = {
@@ -296,7 +296,7 @@ U_BOOT_DEVICE(phandle_target) = {
 \t.platdata_size\t= sizeof(dtv_phandle_target),
 };
 
-static struct dtd_target dtv_phandle2_target = {
+static const struct dtd_target dtv_phandle2_target = {
 \t.intval\t\t\t= 0x1,
 };
 U_BOOT_DEVICE(phandle2_target) = {
@@ -305,7 +305,7 @@ U_BOOT_DEVICE(phandle2_target) = {
 \t.platdata_size\t= sizeof(dtv_phandle2_target),
 };
 
-static struct dtd_target dtv_phandle3_target = {
+static const struct dtd_target dtv_phandle3_target = {
 \t.intval\t\t\t= 0x2,
 };
 U_BOOT_DEVICE(phandle3_target) = {
@@ -314,7 +314,7 @@ U_BOOT_DEVICE(phandle3_target) = {
 \t.platdata_size\t= sizeof(dtv_phandle3_target),
 };
 
-static struct dtd_source dtv_phandle_source = {
+static const struct dtd_source dtv_phandle_source = {
 \t.clocks\t\t\t= {
 \t\t\t{&dtv_phandle_target, {}},
 \t\t\t{&dtv_phandle2_target, {11}},
@@ -327,7 +327,7 @@ U_BOOT_DEVICE(phandle_source) = {
 \t.platdata_size\t= sizeof(dtv_phandle_source),
 };
 
-static struct dtd_source dtv_phandle_source2 = {
+static const struct dtd_source dtv_phandle_source2 = {
 \t.clocks\t\t\t= {
 \t\t\t{&dtv_phandle_target, {}},},
 };
@@ -363,7 +363,7 @@ struct dtd_target {
         with open(output) as infile:
             data = infile.read()
         self._CheckStrings(C_HEADER + '''
-static struct dtd_target dtv_phandle_target = {
+static const struct dtd_target dtv_phandle_target = {
 };
 U_BOOT_DEVICE(phandle_target) = {
 \t.name\t\t= "target",
@@ -371,7 +371,7 @@ U_BOOT_DEVICE(phandle_target) = {
 \t.platdata_size\t= sizeof(dtv_phandle_target),
 };
 
-static struct dtd_source dtv_phandle_source2 = {
+static const struct dtd_source dtv_phandle_source2 = {
 \t.clocks\t\t\t= {
 \t\t\t{&dtv_phandle_target, {}},},
 };
@@ -422,7 +422,7 @@ struct dtd_compat1 {
         with open(output) as infile:
             data = infile.read()
         self._CheckStrings(C_HEADER + '''
-static struct dtd_compat1 dtv_spl_test = {
+static const struct dtd_compat1 dtv_spl_test = {
 \t.intval\t\t\t= 0x1,
 };
 U_BOOT_DEVICE(spl_test) = {
@@ -456,7 +456,7 @@ struct dtd_test3 {
         with open(output) as infile:
             data = infile.read()
         self._CheckStrings(C_HEADER + '''
-static struct dtd_test1 dtv_test1 = {
+static const struct dtd_test1 dtv_test1 = {
 \t.reg\t\t\t= {0x1234, 0x5678},
 };
 U_BOOT_DEVICE(test1) = {
@@ -465,7 +465,7 @@ U_BOOT_DEVICE(test1) = {
 \t.platdata_size\t= sizeof(dtv_test1),
 };
 
-static struct dtd_test2 dtv_test2 = {
+static const struct dtd_test2 dtv_test2 = {
 \t.reg\t\t\t= {0x1234567890123456, 0x9876543210987654},
 };
 U_BOOT_DEVICE(test2) = {
@@ -474,7 +474,7 @@ U_BOOT_DEVICE(test2) = {
 \t.platdata_size\t= sizeof(dtv_test2),
 };
 
-static struct dtd_test3 dtv_test3 = {
+static const struct dtd_test3 dtv_test3 = {
 \t.reg\t\t\t= {0x1234567890123456, 0x9876543210987654, 0x2, 0x3},
 };
 U_BOOT_DEVICE(test3) = {
@@ -505,7 +505,7 @@ struct dtd_test2 {
         with open(output) as infile:
             data = infile.read()
         self._CheckStrings(C_HEADER + '''
-static struct dtd_test1 dtv_test1 = {
+static const struct dtd_test1 dtv_test1 = {
 \t.reg\t\t\t= {0x1234, 0x5678},
 };
 U_BOOT_DEVICE(test1) = {
@@ -514,7 +514,7 @@ U_BOOT_DEVICE(test1) = {
 \t.platdata_size\t= sizeof(dtv_test1),
 };
 
-static struct dtd_test2 dtv_test2 = {
+static const struct dtd_test2 dtv_test2 = {
 \t.reg\t\t\t= {0x12345678, 0x98765432, 0x2, 0x3},
 };
 U_BOOT_DEVICE(test2) = {
@@ -548,7 +548,7 @@ struct dtd_test3 {
         with open(output) as infile:
             data = infile.read()
         self._CheckStrings(C_HEADER + '''
-static struct dtd_test1 dtv_test1 = {
+static const struct dtd_test1 dtv_test1 = {
 \t.reg\t\t\t= {0x123400000000, 0x5678},
 };
 U_BOOT_DEVICE(test1) = {
@@ -557,7 +557,7 @@ U_BOOT_DEVICE(test1) = {
 \t.platdata_size\t= sizeof(dtv_test1),
 };
 
-static struct dtd_test2 dtv_test2 = {
+static const struct dtd_test2 dtv_test2 = {
 \t.reg\t\t\t= {0x1234567890123456, 0x98765432},
 };
 U_BOOT_DEVICE(test2) = {
@@ -566,7 +566,7 @@ U_BOOT_DEVICE(test2) = {
 \t.platdata_size\t= sizeof(dtv_test2),
 };
 
-static struct dtd_test3 dtv_test3 = {
+static const struct dtd_test3 dtv_test3 = {
 \t.reg\t\t\t= {0x1234567890123456, 0x98765432, 0x2, 0x3},
 };
 U_BOOT_DEVICE(test3) = {
@@ -600,7 +600,7 @@ struct dtd_test3 {
         with open(output) as infile:
             data = infile.read()
         self._CheckStrings(C_HEADER + '''
-static struct dtd_test1 dtv_test1 = {
+static const struct dtd_test1 dtv_test1 = {
 \t.reg\t\t\t= {0x1234, 0x567800000000},
 };
 U_BOOT_DEVICE(test1) = {
@@ -609,7 +609,7 @@ U_BOOT_DEVICE(test1) = {
 \t.platdata_size\t= sizeof(dtv_test1),
 };
 
-static struct dtd_test2 dtv_test2 = {
+static const struct dtd_test2 dtv_test2 = {
 \t.reg\t\t\t= {0x12345678, 0x9876543210987654},
 };
 U_BOOT_DEVICE(test2) = {
@@ -618,7 +618,7 @@ U_BOOT_DEVICE(test2) = {
 \t.platdata_size\t= sizeof(dtv_test2),
 };
 
-static struct dtd_test3 dtv_test3 = {
+static const struct dtd_test3 dtv_test3 = {
 \t.reg\t\t\t= {0x12345678, 0x9876543210987654, 0x2, 0x3},
 };
 U_BOOT_DEVICE(test3) = {
@@ -667,7 +667,7 @@ struct dtd_sandbox_spl_test {
         with open(output) as infile:
             data = infile.read()
         self._CheckStrings(C_HEADER + '''
-static struct dtd_sandbox_spl_test dtv_spl_test = {
+static const struct dtd_sandbox_spl_test dtv_spl_test = {
 \t.intval\t\t\t= 0x1,
 };
 U_BOOT_DEVICE(spl_test) = {
@@ -676,7 +676,7 @@ U_BOOT_DEVICE(spl_test) = {
 \t.platdata_size\t= sizeof(dtv_spl_test),
 };
 
-static struct dtd_sandbox_spl_test dtv_spl_test2 = {
+static const struct dtd_sandbox_spl_test dtv_spl_test2 = {
 \t.intarray\t\t= 0x5,
 };
 U_BOOT_DEVICE(spl_test2) = {