linux-kernel - [PATCH] dt-bindings: nvmem: u-boot,env: add Broadcom's variant binding

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Message-Id: <20220406152515.31316-1-zajec5@gmail.com>
Date:   Wed,  6 Apr 2022 17:25:15 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Tom Rini <trini@...sulko.com>
Cc:     Florian Fainelli <f.fainelli@...il.com>,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        u-boot@...ts.denx.de, bcm-kernel-feedback-list@...adcom.com,
        linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: [PATCH] dt-bindings: nvmem: u-boot,env: add Broadcom's variant binding

From: Rafał Miłecki <rafal@...ecki.pl>

Broadcom uses U-Boot for some of their recent platforms like BCM4908.
They decided to use modified environment variables variables format
though. Their header includes 2 extra 32 b fields at the beginning.

The first field meaning is unknown, the second one stores length of env
data block. Example (length 0x4000):
$ hexdump -n 32 -C -s 0x40000 /dev/mtdblock0
00040000  76 6e 45 75 00 40 00 00  34 89 7a 82 49 4d 41 47  |vnEu.@....z.IMAG|
00040010  45 3d 4e 41 4e 44 3a 31  4d 2c 31 30 32 34 4d 00  |E=NAND:1M,1024M.|

Add a custom "compatible" value to allow describing Broadcom devices
properly.

Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
 Documentation/devicetree/bindings/nvmem/u-boot,env.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml b/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
index e70b2a60cb9a..6a6b223be4a0 100644
--- a/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
+++ b/Documentation/devicetree/bindings/nvmem/u-boot,env.yaml
@@ -36,6 +36,8 @@ properties:
         const: u-boot,env-redundant-bool
       - description: Two redundant blocks with active having higher counter
         const: u-boot,env-redundant-count
+      - description: Broadcom's variant with custom header
+        const: brcm,env
 
   reg:
     maxItems: 1
-- 
2.34.1