dts: arm: renesas: Add erase-value-undefined property for Renesas RA flash

jeremydick · fabiobaltieri · commit 48680298c1c4 · 2025-05-13T07:24:39.000+01:00
Add an erased-undefined property for Renesas RA series MCUS
data flash that will read back undefined values when erased

Signed-off-by: Jeremy Dick &lt;jdick@pivotint.com&gt;
diff --git a/dts/arm/renesas/ra/ra4/r7fa4e10d2cfm.dtsi b/dts/arm/renesas/ra/ra4/r7fa4e10d2cfm.dtsi
@@ -28,6 +28,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 	};
diff --git a/dts/arm/renesas/ra/ra4/r7fa4e10d2cne.dtsi b/dts/arm/renesas/ra/ra4/r7fa4e10d2cne.dtsi
@@ -28,6 +28,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 	};
diff --git a/dts/arm/renesas/ra/ra4/r7fa4e2b93cfm.dtsi b/dts/arm/renesas/ra/ra4/r7fa4e2b93cfm.dtsi
@@ -57,6 +57,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 
diff --git a/dts/arm/renesas/ra/ra4/r7fa4m2ad3cfp.dtsi b/dts/arm/renesas/ra/ra4/r7fa4m2ad3cfp.dtsi
@@ -28,6 +28,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 	};
diff --git a/dts/arm/renesas/ra/ra4/r7fa4m3af3cfb.dtsi b/dts/arm/renesas/ra/ra4/r7fa4m3af3cfb.dtsi
@@ -28,6 +28,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 	};
diff --git a/dts/arm/renesas/ra/ra6/r7fa6e10f2cfp.dtsi b/dts/arm/renesas/ra/ra6/r7fa6e10f2cfp.dtsi
@@ -27,6 +27,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 	};
diff --git a/dts/arm/renesas/ra/ra6/r7fa6e2bb3cfm.dtsi b/dts/arm/renesas/ra/ra6/r7fa6e2bb3cfm.dtsi
@@ -27,6 +27,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 	};
diff --git a/dts/arm/renesas/ra/ra6/r7fa6m1ad3cfp.dtsi b/dts/arm/renesas/ra/ra6/r7fa6m1ad3cfp.dtsi
@@ -36,6 +36,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 
diff --git a/dts/arm/renesas/ra/ra6/r7fa6m2af3cfb.dtsi b/dts/arm/renesas/ra/ra6/r7fa6m2af3cfb.dtsi
@@ -27,6 +27,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 
diff --git a/dts/arm/renesas/ra/ra6/r7fa6m3ah3cfc.dtsi b/dts/arm/renesas/ra/ra6/r7fa6m3ah3cfc.dtsi
@@ -27,6 +27,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 
diff --git a/dts/arm/renesas/ra/ra6/r7fa6m4af3cfb.dtsi b/dts/arm/renesas/ra/ra6/r7fa6m4af3cfb.dtsi
@@ -27,6 +27,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 	};
diff --git a/dts/arm/renesas/ra/ra6/r7fa6m5bh3cfc.dtsi b/dts/arm/renesas/ra/ra6/r7fa6m5bh3cfc.dtsi
@@ -27,6 +27,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 	};
diff --git a/dts/arm/renesas/ra/ra8/r7fa8d1bhecbd.dtsi b/dts/arm/renesas/ra/ra8/r7fa8d1bhecbd.dtsi
@@ -28,6 +28,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 	};
diff --git a/dts/arm/renesas/ra/ra8/r7fa8m1ahecbd.dtsi b/dts/arm/renesas/ra/ra8/r7fa8m1ahecbd.dtsi
@@ -27,6 +27,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 	};
diff --git a/dts/arm/renesas/ra/ra8/r7fa8t1ahecbd.dtsi b/dts/arm/renesas/ra/ra8/r7fa8t1ahecbd.dtsi
@@ -27,6 +27,7 @@
 				write-block-size = <4>;
 				erase-block-size = <64>;
 				programming-enable;
+				erase-value-undefined;
 			};
 		};
 	};
diff --git a/dts/bindings/mtd/renesas,ra-nv-data-flash.yaml b/dts/bindings/mtd/renesas,ra-nv-data-flash.yaml
@@ -13,3 +13,7 @@ properties:
     type: boolean
     description: |
       Enable data flash programming configuration
+
+  erase-value-undefined:
+    type: boolean
+    description: Areas of flash that are in an erased state will read back undefined values.
