lkml.org 
[lkml]   [2022]   [Jan]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 2/2] dt-bindings: nvmem: cells: add MAC address cell
Date
From: Rafał Miłecki <rafal@milecki.pl>

This adds support for describing details of NVMEM cell containing MAC
address. Those are often device specific and could be nicely stored in
DT.

Initial documentation includes support for describing:
1. Cell data format (e.g. Broadcom's NVRAM uses ASCII to store MAC)
2. Reversed bytes flash (required for i.MX6/i.MX7 OCOTP support)
3. Source for multiple addresses (very common in home routers)

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
---
.../bindings/nvmem/cells/mac-address.yaml | 94 +++++++++++++++++++
1 file changed, 94 insertions(+)
create mode 100644 Documentation/devicetree/bindings/nvmem/cells/mac-address.yaml

diff --git a/Documentation/devicetree/bindings/nvmem/cells/mac-address.yaml b/Documentation/devicetree/bindings/nvmem/cells/mac-address.yaml
new file mode 100644
index 000000000000..f8d19e87cdf0
--- /dev/null
+++ b/Documentation/devicetree/bindings/nvmem/cells/mac-address.yaml
@@ -0,0 +1,94 @@
+# SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/nvmem/cells/mac-address.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: NVMEM cell containing a MAC address
+
+maintainers:
+ - Rafał Miłecki <rafal@milecki.pl>
+
+properties:
+ compatible:
+ const: mac-address
+
+ format:
+ description: |
+ Some NVMEM cells contain MAC in a non-binary format.
+
+ ASCII should be specified if MAC is string formatted like:
+ - "01:23:45:67:89:AB" (30 31 3a 32 33 3a 34 35 3a 36 37 3a 38 39 3a 41 42)
+ - "01-23-45-67-89-AB"
+ - "0123456789AB"
+ enum:
+ - ascii
+
+ reversed-bytes:
+ type: boolean
+ description: |
+ MAC is stored in reversed bytes order. Example:
+ Stored value: AB 89 67 45 23 01
+ Actual MAC: 01 23 45 67 89 AB
+
+ base-address:
+ type: boolean
+ description: |
+ Marks NVMEM cell as provider of multiple addresses that are relative to
+ the one actually stored physically. Respective addresses can be requested
+ by specifying cell index of NVMEM cell.
+
+allOf:
+ - $ref: cell.yaml#
+ - if:
+ required:
+ - base-address
+ then:
+ properties:
+ "#nvmem-cell-cells":
+ const: 1
+ required:
+ - "#nvmem-cell-cells"
+
+unevaluatedProperties: false
+
+examples:
+ - |
+ partitions {
+ compatible = "fixed-partitions";
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ partition@f00000 {
+ compatible = "nvmem-cells";
+ label = "calibration";
+ reg = <0xf00000 0x100000>;
+ ranges = <0 0xf00000 0x100000>;
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ mac@100 {
+ compatible = "mac-address";
+ reg = <0x100 0x6>;
+ };
+
+ mac@200 {
+ compatible = "mac-address";
+ reg = <0x200 0x6>;
+ reversed-bytes;
+ };
+
+ mac@300 {
+ compatible = "mac-address";
+ reg = <0x300 0x11>;
+ format = "ascii";
+ };
+
+ mac@400 {
+ compatible = "mac-address";
+ reg = <0x400 0x6>;
+ base-address;
+ #nvmem-cell-cells = <1>;
+ };
+ };
+ };
--
2.31.1
\
 
 \ /
  Last update: 2022-01-25 19:05    [W:0.102 / U:0.148 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site