dt-bindings: mtd: spi-nor: Convert to DT schema format

Convert the SPI-NOR binding to DT schema format. Like other memory chips,
the compatible strings are a mess with vendor prefixes not being used
consistently and some compatibles not documented. The resulting schema
passes on 'compatible' checks for most in tree users with the exception
of some oddballs.

I dropped the 'm25p.*-nonjedec' compatible strings as these don't appear
to be used anywhere.

Cc: Miquel Raynal <miquel.raynal@bootlin.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Vignesh Raghavendra <vigneshr@ti.com>
Cc: linux-mtd@lists.infradead.org
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210202175340.3902494-1-robh@kernel.org

1 files changed, 102 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
new file mode 100644
index 000000000000..5e7e5349f9a1
--- /dev/null
+++ b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
@@ -0,0 +1,102 @@
+# SPDX-License-Identifier: GPL-2.0-only
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mtd/jedec,spi-nor.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: SPI NOR flash ST M25Pxx (and similar) serial flash chips
+
+maintainers:
+  - Rob Herring <robh@kernel.org>
+
+properties:
+  compatible:
+    oneOf:
+      - items:
+          - pattern: "^((((micron|spansion|st),)?\
+              (m25p(40|80|16|32|64|128)|\
+              n25q(32b|064|128a11|128a13|256a|512a|164k)))|\
+              atmel,at25df(321a|641|081a)|\
+              everspin,mr25h(10|40|128|256)|\
+              (mxicy|macronix),mx25l(4005a|1606e|6405d|8005|12805d|25635e)|\
+              (mxicy|macronix),mx25u(4033|4035)|\
+              (spansion,)?s25fl(128s|256s1|512s|008k|064k|164k)|\
+              (sst|microchip),sst25vf(016b|032b|040b)|\
+              (sst,)?sst26wf016b|\
+              (sst,)?sst25wf(040b|080)|\
+              winbond,w25x(80|32)|\
+              (winbond,)?w25q(16|32(w|dw)?|64(dw)?|80bl|128(fw)?|256))$"
+          - const: jedec,spi-nor
+      - items:
+          - enum:
+              - issi,is25lp016d
+              - micron,mt25qu02g
+              - mxicy,mx25r1635f
+              - mxicy,mx25u6435f
+              - mxicy,mx25v8035f
+              - spansion,s25sl12801
+              - spansion,s25fs512s
+          - const: jedec,spi-nor
+      - const: jedec,spi-nor
+    description:
+      Must also include "jedec,spi-nor" for any SPI NOR flash that can be
+      identified by the JEDEC READ ID opcode (0x9F).
+
+  reg:
+    maxItems: 1
+
+  spi-max-frequency: true
+  spi-rx-bus-width: true
+  spi-tx-bus-width: true
+
+  m25p,fast-read:
+    type: boolean
+    description:
+      Use the "fast read" opcode to read data from the chip instead of the usual
+      "read" opcode. This opcode is not supported by all chips and support for
+      it can not be detected at runtime. Refer to your chips' datasheet to check
+      if this is supported by your chip.
+
+  broken-flash-reset:
+    type: boolean
+    description:
+      Some flash devices utilize stateful addressing modes (e.g., for 32-bit
+      addressing) which need to be managed carefully by a system. Because these
+      sorts of flash don't have a standardized software reset command, and
+      because some systems don't toggle the flash RESET# pin upon system reset
+      (if the pin even exists at all), there are systems which cannot reboot
+      properly if the flash is left in the "wrong" state. This boolean flag can
+      be used on such systems, to denote the absence of a reliable reset
+      mechanism.
+
+  label: true
+
+  partitions:
+    type: object
+
+  '#address-cells': true
+  '#size-cells': true
+
+patternProperties:
+  # Note: use 'partitions' node for new users
+  '^partition@':
+    type: object
+
+additionalProperties: false
+
+examples:
+  - |
+    spi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        flash@0 {
+            #address-cells = <1>;
+            #size-cells = <1>;
+            compatible = "spansion,m25p80", "jedec,spi-nor";
+            reg = <0>;
+            spi-max-frequency = <40000000>;
+            m25p,fast-read;
+        };
+    };
+...