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From:   Christian Eggers <ceggers@arri.de>
To:     Rob Herring <robh+dt@kernel.org>
CC:     Christian Eggers <ceggers@arri.de>,
        Bartosz Golaszewski <bgolaszewski@baylibre.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: [PATCH v2] dt-bindings: at25: convert the binding document to yaml
Date:   Tue, 4 Aug 2020 08:33:07 +0200
Message-ID: <20200804063307.10029-1-ceggers@arri.de>
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Convert the binding document for at25 EEPROMs from txt to yaml.

Signed-off-by: Christian Eggers <ceggers@arri.de>
---
On Tuesday, 4 August 2020, 00:12:06 CEST, Rob Herring wrote:
> On Sun, Aug 02, 2020 at 07:46:26PM +0200, Christian Eggers wrote:
> > As there is virtually an infinite list of possible vendors and products
> > for such type of hardware, is there any value to use expressions like in
> > the at24 binding?
> 
> Maybe so, but there are only 4 compatible strings to document in the
> tree. That's not a lot to cover and we already have some of them in
> free-form text. If the infinite number becomes a problem we can always
> address that later. I'm sure that less than infinite buyers/products
> will prevent infinite producers.

Added the following devices to the new yaml binding:
- Examples from description of previous txt binding.
- Result of grepping .dts and .dtsi files for atmel,at25
- Devices I personally use (dts files not mainlined yet).

 .../devicetree/bindings/eeprom/at25.txt       |  46 +------
 .../devicetree/bindings/eeprom/at25.yaml      | 129 ++++++++++++++++++
 2 files changed, 130 insertions(+), 45 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/eeprom/at25.yaml

diff --git a/Documentation/devicetree/bindings/eeprom/at25.txt b/Documentation/devicetree/bindings/eeprom/at25.txt
index fe91ecf1f61b..d9ef7dc5fb8e 100644
--- a/Documentation/devicetree/bindings/eeprom/at25.txt
+++ b/Documentation/devicetree/bindings/eeprom/at25.txt
@@ -1,45 +1 @@
-EEPROMs (SPI) compatible with Atmel at25.
-
-Required properties:
-- compatible : Should be "<vendor>,<type>", and generic value "atmel,at25".
-  Example "<vendor>,<type>" values:
-    "anvo,anv32e61w"
-    "microchip,25lc040"
-    "st,m95m02"
-    "st,m95256"
-
-- reg : chip select number
-- spi-max-frequency : max spi frequency to use
-- pagesize : size of the eeprom page
-- size : total eeprom size in bytes
-- address-width : number of address bits (one of 8, 9, 16, or 24).
-  For 9 bits, the MSB of the address is sent as bit 3 of the instruction
-  byte, before the address byte.
-
-Optional properties:
-- spi-cpha : SPI shifted clock phase, as per spi-bus bindings.
-- spi-cpol : SPI inverse clock polarity, as per spi-bus bindings.
-- read-only : this parameter-less property disables writes to the eeprom
-- wp-gpios : GPIO to which the write-protect pin of the chip is connected
-
-Obsolete legacy properties can be used in place of "size", "pagesize",
-"address-width", and "read-only":
-- at25,byte-len : total eeprom size in bytes
-- at25,addr-mode : addr-mode flags, as defined in include/linux/spi/eeprom.h
-- at25,page-size : size of the eeprom page
-
-Additional compatible properties are also allowed.
-
-Example:
-	eeprom@0 {
-		compatible = "st,m95256", "atmel,at25";
-		reg = <0>;
-		spi-max-frequency = <5000000>;
-		spi-cpha;
-		spi-cpol;
-		wp-gpios = <&gpio1 3 0>;
-
-		pagesize = <64>;
-		size = <32768>;
-		address-width = <16>;
-	};
+This file has been moved to at25.yaml.
diff --git a/Documentation/devicetree/bindings/eeprom/at25.yaml b/Documentation/devicetree/bindings/eeprom/at25.yaml
new file mode 100644
index 000000000000..9810619a2b5c
--- /dev/null
+++ b/Documentation/devicetree/bindings/eeprom/at25.yaml
@@ -0,0 +1,129 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/eeprom/at25.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: SPI EEPROMs compatible with Atmel's AT25
+
+maintainers:
+  - Christian Eggers <ceggers@arri.de>
+
+properties:
+  $nodename:
+    pattern: "^eeprom@[0-9a-f]{1,2}$"
+
+  # There are multiple known vendors who manufacture EEPROM chips compatible
+  # with Atmel's AT25. The compatible string requires two items where the
+  # 'vendor' and 'model' parts of the first are the actual chip and the second
+  # item is fixed to "atmel,at25". Some existing bindings only have the
+  # "atmel,at25" part and should be fixed by somebody who knows vendor and
+  # product.
+  compatible:
+    oneOf:
+      - items:
+          - enum:
+              - anvo,anv32e61w
+              - atmel,at25256B
+              - fujitsu,mb85rs1mt
+              - fujitsu,mb85rs64
+              - microchip,at25160bn
+              - microchip,25lc040
+              - st,m95m02
+              - st,m95256
+
+          - const: atmel,at25
+
+      # Please don't use this alternative for new bindings.
+      - items:
+          - const: atmel,at25
+
+  reg:
+    description:
+      Chip select number.
+
+  spi-max-frequency: true
+
+  pagesize:
+    $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:
+    $ref: /schemas/types.yaml#definitions/uint32
+    description:
+      Total eeprom size in bytes.
+
+  address-width:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [ 8, 9, 16, 24 ]
+    description:
+      Number of address bits.
+      For 9 bits, the MSB of the address is sent as bit 3 of the instruction
+      byte, before the address byte.
+
+  spi-cpha: true
+
+  spi-cpol: true
+
+  read-only:
+    description:
+      Disable writes to the eeprom.
+    type: boolean
+
+  wp-gpios:
+    maxItems: 1
+    description:
+      GPIO to which the write-protect pin of the chip is connected.
+
+  # Deprecated: at25,byte-len, at25,addr-mode, at25,page-size
+  at25,byte-len:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+       Total eeprom size in bytes. Deprecated, use "size" property instead.
+    deprecated: true
+
+  at25,addr-mode:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+       Addr-mode flags, as defined in include/linux/spi/eeprom.h.
+       Deprecated, use "address-width" property instead.
+    deprecated: true
+
+  at25,page-size:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Size of the eeprom page. Deprecated, use "pagesize" property instead.
+    deprecated: true
+
+required:
+  - compatible
+  - reg
+  - spi-max-frequency
+  - pagesize
+  - size
+  - address-width
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+    spi0 {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        eeprom@0 {
+            compatible = "st,m95256", "atmel,at25";
+            reg = <0>;
+            spi-max-frequency = <5000000>;
+            spi-cpha;
+            spi-cpol;
+            wp-gpios = <&gpio1 3 0>;
+
+            pagesize = <64>;
+            size = <32768>;
+            address-width = <16>;
+        };
+    };
-- 
Christian Eggers
Embedded software developer

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