diff --git a/boards/arm/mimxrt1015_evk/mimxrt1015_evk.dts b/boards/arm/mimxrt1015_evk/mimxrt1015_evk.dts
index 8f6262e5d52..3eaf0813fbf 100644
--- a/boards/arm/mimxrt1015_evk/mimxrt1015_evk.dts
+++ b/boards/arm/mimxrt1015_evk/mimxrt1015_evk.dts
@@ -53,6 +53,7 @@ arduino_serial: &uart4 {};
 	reg = <0x402a8000 0x4000>, <0x60000000 0x1000000>;
 	at25sf128a: at25sf128a@0 {
 		compatible = "adesto,at25sf128a", "jedec,spi-nor";
+		size = <134217728>;
 		label = "AT25SF128A";
 		reg = <0>;
 		spi-max-frequency = <133000000>;
diff --git a/boards/arm/mimxrt1020_evk/mimxrt1020_evk.dts b/boards/arm/mimxrt1020_evk/mimxrt1020_evk.dts
index bb46a60de7f..d5c63cacf0d 100644
--- a/boards/arm/mimxrt1020_evk/mimxrt1020_evk.dts
+++ b/boards/arm/mimxrt1020_evk/mimxrt1020_evk.dts
@@ -61,6 +61,7 @@ arduino_serial: &uart2 {};
 	reg = <0x402a8000 0x4000>, <0x60000000 0x800000>;
 	is25wp064: is25wp064@0 {
 		compatible = "issi,is25wp064", "jedec,spi-nor";
+		size = <67108864>;
 		label = "IS25WP064";
 		reg = <0>;
 		spi-max-frequency = <133000000>;
diff --git a/boards/arm/mimxrt1050_evk/mimxrt1050_evk_qspi.dts b/boards/arm/mimxrt1050_evk/mimxrt1050_evk_qspi.dts
index ebf5d33eaad..a6672d068d9 100644
--- a/boards/arm/mimxrt1050_evk/mimxrt1050_evk_qspi.dts
+++ b/boards/arm/mimxrt1050_evk/mimxrt1050_evk_qspi.dts
@@ -12,6 +12,7 @@
 	reg = <0x402a8000 0x4000>, <0x60000000 0x800000>;
 	is25wp064: is25wp064@0 {
 		compatible = "issi,is25wp064", "jedec,spi-nor";
+		size = <67108864>;
 		label = "IS25WP064";
 		reg = <0>;
 		spi-max-frequency = <133000000>;
diff --git a/boards/arm/mimxrt1060_evk/mimxrt1060_evk.dts b/boards/arm/mimxrt1060_evk/mimxrt1060_evk.dts
index 087953e2639..918088ef0c8 100644
--- a/boards/arm/mimxrt1060_evk/mimxrt1060_evk.dts
+++ b/boards/arm/mimxrt1060_evk/mimxrt1060_evk.dts
@@ -68,6 +68,7 @@ arduino_serial: &uart3 {};
 	reg = <0x402a8000 0x4000>, <0x60000000 0x800000>;
 	is25wp064: is25wp064@0 {
 		compatible = "issi,is25wp064", "jedec,spi-nor";
+		size = <67108864>;
 		label = "IS25WP064";
 		reg = <0>;
 		spi-max-frequency = <133000000>;
diff --git a/boards/riscv/hifive1/hifive1.dts b/boards/riscv/hifive1/hifive1.dts
index a6a43a6af60..9ef07c17915 100644
--- a/boards/riscv/hifive1/hifive1.dts
+++ b/boards/riscv/hifive1/hifive1.dts
@@ -63,6 +63,7 @@
 	reg = <0x10014000 0x1000 0x20400000 0xc00000>;
 	flash0: flash@0 {
 		compatible = "issi,is25lp128", "jedec,spi-nor";
+		size = <134217728>;
 		label = "FLASH0";
 		jedec-id = [96 60 18];
 		reg = <0>;
diff --git a/boards/riscv/hifive1_revb/hifive1_revb.dts b/boards/riscv/hifive1_revb/hifive1_revb.dts
index f46fba3aa90..a2eabc6247c 100644
--- a/boards/riscv/hifive1_revb/hifive1_revb.dts
+++ b/boards/riscv/hifive1_revb/hifive1_revb.dts
@@ -61,6 +61,7 @@
 	reg = <0x10014000 0x1000 0x20010000 0x3c0900>;
 	flash0: flash@0 {
 		compatible = "issi,is25lp128", "jedec,spi-nor";
+		size = <134217728>;
 		label = "FLASH0";
 		jedec-id = [96 60 18];
 		reg = <0>;
diff --git a/boards/riscv/qemu_riscv32/qemu_riscv32.dts b/boards/riscv/qemu_riscv32/qemu_riscv32.dts
index a6411c96934..75b97b89c96 100644
--- a/boards/riscv/qemu_riscv32/qemu_riscv32.dts
+++ b/boards/riscv/qemu_riscv32/qemu_riscv32.dts
@@ -39,6 +39,7 @@
 	reg = <0x10014000 0x1000 0x20400000 0xc00000>;
 	flash0: flash@0 {
 		compatible = "issi,is25lp128", "jedec,spi-nor";
+		size = <134217728>;
 		label = "FLASH0";
 		jedec-id = [96 60 18];
 		reg = <0>;
diff --git a/boards/riscv/qemu_riscv64/qemu_riscv64.dts b/boards/riscv/qemu_riscv64/qemu_riscv64.dts
index a323e542985..3e4668f3619 100644
--- a/boards/riscv/qemu_riscv64/qemu_riscv64.dts
+++ b/boards/riscv/qemu_riscv64/qemu_riscv64.dts
@@ -43,6 +43,7 @@
 	reg = <0x10014000 0x1000 0x20400000 0xc00000>;
 	flash0: flash@0 {
 		compatible = "issi,is25lp128", "jedec,spi-nor";
+		size = <134217728>;
 		label = "FLASH0";
 		jedec-id = [96 60 18];
 		reg = <0>;
diff --git a/dts/arm/nxp/nxp_rt1064.dtsi b/dts/arm/nxp/nxp_rt1064.dtsi
index a22f9a75abf..e2748d4a0ee 100644
--- a/dts/arm/nxp/nxp_rt1064.dtsi
+++ b/dts/arm/nxp/nxp_rt1064.dtsi
@@ -11,6 +11,7 @@
 	/* WINBOND */
 	w25q32jvwj0: w25q32jvwj@0 {
 		compatible = "winbond,w25q32jvwj", "jedec,spi-nor";
+		size = <33554432>;
 		label = "W25Q32JVWJ0";
 		reg = <0>;
 		spi-max-frequency = <133000000>;
diff --git a/dts/bindings/mtd/jedec,spi-nor.yaml b/dts/bindings/mtd/jedec,spi-nor.yaml
index 837d2014e4c..85c8adfcdfd 100644
--- a/dts/bindings/mtd/jedec,spi-nor.yaml
+++ b/dts/bindings/mtd/jedec,spi-nor.yaml
@@ -23,7 +23,7 @@ properties:
 
   size:
     type: int
-    required: false
+    required: true
     description: flash capacity in bits
 
   wp-gpios: