linux-kernel - [PATCH v3 3/4] dt-bindings: mtd: physmap: Allow using memory-region to access memory resources

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Message-Id: <20260107-mtd-memregion-v3-3-f9fc9107b992@bootlin.com>
Date: Wed, 07 Jan 2026 14:04:54 +0100
From: Gregory CLEMENT <gregory.clement@...tlin.com>
To: Rob Herring <robh@...nel.org>, Linus Walleij <linus.walleij@...aro.org>, 
 Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
 Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>, 
 Benoît Monin <benoit.monin@...tlin.com>, 
 Théo Lebrun <theo.lebrun@...tlin.com>, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-mtd@...ts.infradead.org, 
 Gregory CLEMENT <gregory.clement@...tlin.com>
Subject: [PATCH v3 3/4] dt-bindings: mtd: physmap: Allow using
 memory-region to access memory resources

Enable access to memory resources not only via I/O address using reg,
but also through a portion of main memory using memory-region. To
achieve this, new compatible strings have been introduced: mtd-mem and
mtd-memro.

Signed-off-by: Gregory CLEMENT <gregory.clement@...tlin.com>
---
 .../devicetree/bindings/mtd/mtd-physmap.yaml       | 69 ++++++++++++++++------
 1 file changed, 52 insertions(+), 17 deletions(-)

diff --git a/Documentation/devicetree/bindings/mtd/mtd-physmap.yaml b/Documentation/devicetree/bindings/mtd/mtd-physmap.yaml
index a9ec3ca002c7d..98d45982d8eb9 100644
--- a/Documentation/devicetree/bindings/mtd/mtd-physmap.yaml
+++ b/Documentation/devicetree/bindings/mtd/mtd-physmap.yaml
@@ -13,10 +13,6 @@ description: |
   Flash chips (Memory Technology Devices) are often used for solid state
   file systems on embedded devices.
 
-allOf:
-  - $ref: mtd.yaml#
-  - $ref: /schemas/memory-controllers/mc-peripheral-props.yaml#
-
 properties:
   compatible:
     oneOf:
@@ -61,6 +57,8 @@ properties:
           - jedec-flash
           - mtd-ram
           - mtd-rom
+          - mtd-mem
+          - mtd-memro
 
   reg:
     description: |
@@ -141,19 +139,37 @@ required:
   - compatible
   - reg
 
-if:
-  properties:
-    compatible:
-      contains:
-        const: cortina,gemini-flash
-then:
-  properties:
-    syscon:
-      $ref: /schemas/types.yaml#/definitions/phandle
-      description:
-        Phandle to the syscon controller
-  required:
-    - syscon
+allOf:
+  - if:
+      properties:
+        compatible:
+          contains:
+            const: cortina,gemini-flash
+    then:
+      properties:
+        syscon:
+          $ref: /schemas/types.yaml#/definitions/phandle
+          description:
+            Phandle to the syscon controller
+          required:
+            - syscon
+  - if:
+      properties:
+        compatible:
+          contains:
+            enum:
+              - mtd-mem
+              - mtd-memro
+    then:
+      $ref: /schemas/reserved-memory/reserved-memory.yaml
+      required:
+        - no-map
+      properties:
+        addr-gpios: false
+    else:
+      allOf:
+        - $ref: /schemas/mtd/mtd.yaml
+        - $ref: /schemas/memory-controllers/mc-peripheral-props.yaml#
 
 unevaluatedProperties: false
 
@@ -233,4 +249,23 @@ examples:
             reg = <0 0x04000000>;
         };
     };
+
+  - |
+    /* An example using mtd-mem/mtd-memro */
+    reserved-memory {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        bm_logs_reserved: bm_logs_reserved@...00800 {
+            compatible = "mtd-mem";
+            reg = <0x1 0x0000800 0x0 0x0010000>;
+            no-map;
+        };
+
+        sys_logs_reserved: sys_logs_reserved@...120000  {
+            compatible = "mtd-memro";
+            reg = <0x1 0x00120000 0x0 0x0010000>;
+            no-map;
+        };
+    };
 ...

-- 
2.51.0