linux-kernel - [PATCH V2 1/6] dt-bindings: nvmem: add cell-type to nvmem cells

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Date:   Thu, 23 Sep 2021 19:01:04 +0800
From:   Joakim Zhang <qiangqing.zhang@....com>
To:     srinivas.kandagatla@...aro.org, robh+dt@...nel.org,
        shawnguo@...nel.org, a.fatoum@...gutronix.de
Cc:     kernel@...gutronix.de, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-imx@....com
Subject: [PATCH V2 1/6] dt-bindings: nvmem: add cell-type to nvmem cells

From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>

Some of the nvmem providers encode data for certain type of nvmem cell,
example mac-address is stored in ascii or with delimiter or in reverse order.

This is much specific to vendor, so having a cell-type would allow nvmem
provider drivers to post-process this before using it.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
Signed-off-by: Joakim Zhang <qiangqing.zhang@....com>
---
 Documentation/devicetree/bindings/nvmem/nvmem.yaml | 11 +++++++++++
 include/dt-bindings/nvmem/nvmem.h                  |  8 ++++++++
 2 files changed, 19 insertions(+)
 create mode 100644 include/dt-bindings/nvmem/nvmem.h

diff --git a/Documentation/devicetree/bindings/nvmem/nvmem.yaml b/Documentation/devicetree/bindings/nvmem/nvmem.yaml
index b8dc3d2b6e92..8cf6c7e72b0a 100644
--- a/Documentation/devicetree/bindings/nvmem/nvmem.yaml
+++ b/Documentation/devicetree/bindings/nvmem/nvmem.yaml
@@ -60,6 +60,11 @@ patternProperties:
             - minimum: 1
               description:
                 Size in bit within the address range specified by reg.
+      cell-type:
+        $ref: /schemas/types.yaml#/definitions/uint32
+        maxItems: 1
+        description:
+          Type of nvmem, Use defines in dt-bindings/nvmem/nvmem.h.
 
     required:
       - reg
@@ -69,6 +74,7 @@ additionalProperties: true
 examples:
   - |
       #include <dt-bindings/gpio/gpio.h>
+      #include <dt-bindings/nvmem/nvmem.h>
 
       qfprom: eeprom@...000 {
           #address-cells = <1>;
@@ -98,6 +104,11 @@ examples:
               reg = <0xc 0x1>;
               bits = <2 3>;
           };
+
+          mac_addr: mac-addr@90{
+              reg = <0x90 0x6>;
+              cell-type = <NVMEM_CELL_TYPE_MAC_ADDRESS>;
+          };
       };
 
 ...
diff --git a/include/dt-bindings/nvmem/nvmem.h b/include/dt-bindings/nvmem/nvmem.h
new file mode 100644
index 000000000000..eed0478f6bfd
--- /dev/null
+++ b/include/dt-bindings/nvmem/nvmem.h
@@ -0,0 +1,8 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __DT_NVMMEM_H
+#define __DT_NVMMEM_H
+
+#define NVMEM_CELL_TYPE_UNKNOWN		0
+#define NVMEM_CELL_TYPE_MAC_ADDRESS	1
+
+#endif /* __DT_NVMMEM_H */
-- 
2.17.1