linux-kernel - [PATCH v2 3/3] nvmem: eeprom: add documentation for FRAM

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Message-Id: <20210413131848.63597-1-jiri.prchal@aksignal.cz>
Date:   Tue, 13 Apr 2021 15:18:48 +0200
From:   Jiri Prchal <jiri.prchal@...ignal.cz>
To:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Rob Herring <robh+dt@...nel.org>,
        Christian Eggers <ceggers@...i.de>,
        Jiri Prchal <jiri.prchal@...ignal.cz>
Subject: [PATCH v2 3/3] nvmem: eeprom: add documentation for FRAM

Added dt binding documentation.

Signed-off-by: Jiri Prchal <jiri.prchal@...ignal.cz>
---
-v2: fixed dt_binding_check warnings thanks to Rob Herring
---
 .../devicetree/bindings/eeprom/at25.yaml      | 31 +++++++++++++++----
 1 file changed, 25 insertions(+), 6 deletions(-)

diff --git a/Documentation/devicetree/bindings/eeprom/at25.yaml b/Documentation/devicetree/bindings/eeprom/at25.yaml
index 121a601db22e..840ee7a83a14 100644
--- a/Documentation/devicetree/bindings/eeprom/at25.yaml
+++ b/Documentation/devicetree/bindings/eeprom/at25.yaml
@@ -4,14 +4,16 @@
 $id: "http://devicetree.org/schemas/eeprom/at25.yaml#"
 $schema: "http://devicetree.org/meta-schemas/core.yaml#"
 
-title: SPI EEPROMs compatible with Atmel's AT25
+title: SPI EEPROMs or FRAMs compatible with Atmel's AT25
 
 maintainers:
   - Christian Eggers <ceggers@...i.de>
 
 properties:
   $nodename:
-    pattern: "^eeprom@[0-9a-f]{1,2}$"
+    anyOf:
+      - pattern: "^eeprom@[0-9a-f]{1,2}$"
+      - pattern: "^fram@[0-9a-f]{1,2}$"
 
   # There are multiple known vendors who manufacture EEPROM chips compatible
   # with Atmel's AT25. The compatible string requires two items where the
@@ -31,6 +33,7 @@ properties:
               - microchip,25lc040
               - st,m95m02
               - st,m95256
+              - cypress,fm25
 
           - const: atmel,at25
 
@@ -48,7 +51,7 @@ properties:
     $ref: /schemas/types.yaml#/definitions/uint32
     enum: [1, 8, 16, 32, 64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768, 65536, 131072]
     description:
-      Size of the eeprom page.
+      Size of the eeprom page. FRAMs don't have pages.
 
   size:
     $ref: /schemas/types.yaml#/definitions/uint32
@@ -101,9 +104,19 @@ required:
   - compatible
   - reg
   - spi-max-frequency
-  - pagesize
-  - size
-  - address-width
+
+allOf:
+  - if:
+      properties:
+        compatible:
+          not:
+            contains:
+              const: cypress,fm25
+    then:
+      required:
+        - pagesize
+        - size
+        - address-width
 
 additionalProperties: false
 
@@ -126,4 +139,10 @@ examples:
             size = <32768>;
             address-width = <16>;
         };
+
+        fram@1 {
+            compatible = "cypress,fm25", "atmel,at25";
+            reg = <1>;
+            spi-max-frequency = <40000000>;
+        };
     };
-- 
2.25.1