linux-kernel - [PATCH 1/3] dt-bindings: mtd: jedec,spi-nor: add optional rdid-dummy-ncycles

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Message-Id: <20250319-snor-rdid-dummy-ncycles-v1-1-fbf64e4c226a@infineon.com>
Date: Wed, 19 Mar 2025 18:47:43 +0900
From: Takahiro Kuwano <tkuw584924@...il.com>
To: Tudor Ambarus <tudor.ambarus@...aro.org>, 
 Pratyush Yadav <pratyush@...nel.org>, Michael Walle <mwalle@...nel.org>, 
 Miquel Raynal <miquel.raynal@...tlin.com>, 
 Richard Weinberger <richard@....at>, Vignesh Raghavendra <vigneshr@...com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>
Cc: linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Bacem Daassi <Bacem.Daassi@...ineon.com>, 
 Takahiro Kuwano <Takahiro.Kuwano@...ineon.com>
Subject: [PATCH 1/3] dt-bindings: mtd: jedec,spi-nor: add optional
 rdid-dummy-ncycles

There are infineon flashes [1] that require 8 dummy cycles for the
1-1-1 Read ID command. Since the command is not covered by JESD216
or any other standard, introduce an optional "rdid-dummy-ncycles"
DT property to allow flashes to be correctly identified.

Link: https://www.infineon.com/dgdl/Infineon-CYRS17B512_512_MB_64_MB_SERIAL_NOR_FLASH_SPI_QSPI_3-DataSheet-v07_00-EN.pdf?fileId=8ac78c8c8fc2dd9c01900eee733d45f3 [1]
Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@...ineon.com>
---
 Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
index 335f8204aa1ebce3d2b4686b2a06d0ea3791667c..25abbe4f5d17f66215fa1af097d14de4a6ef776f 100644
--- a/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
+++ b/Documentation/devicetree/bindings/mtd/jedec,spi-nor.yaml
@@ -63,6 +63,12 @@ properties:
       it can not be detected at runtime. Refer to your chips' datasheet to check
       if this is supported by your chip.
 
+  rdid-dummy-ncycles:
+    $ref: /schemas/types.yaml#/definitions/uint32
+    description:
+      Number of dummy cycles for the 1-1-1 Read ID command, if not zero.
+      The Read ID command is not covered by JESD216 or any other standard.
+
   broken-flash-reset:
     type: boolean
     description:

-- 
2.34.1