linux-kernel - [PATCH] dt-bindings: mt76: support pointing to EEPROM using NVMEM cell

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Date:   Mon,  8 May 2023 17:58:20 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     Felix Fietkau <nbd@....name>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
Cc:     Lorenzo Bianconi <lorenzo@...nel.org>,
        Ryder Lee <ryder.lee@...iatek.com>,
        Shayne Chen <shayne.chen@...iatek.com>,
        Sean Wang <sean.wang@...iatek.com>,
        Kalle Valo <kvalo@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Rafał Miłecki <rafal@...ecki.pl>,
        Christian Marangi <ansuelsmth@...il.com>
Subject: [PATCH] dt-bindings: mt76: support pointing to EEPROM using NVMEM cell

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

All kind of calibration data should be described as NVMEM cells of NVMEM
devices. That is more generic solution than "mediatek,mtd-eeprom" which
is MTD specific.

Add support for EEPROM NVMEM cells and deprecate existing MTD-based
property.

Cc: Christian Marangi <ansuelsmth@...il.com>
Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>
---
Ansuel is working on mt76 driver support for NVMEM based EEPROM access:
https://github.com/openwrt/mt76/pull/765

I took the liberty to propose this binding patch.

One important difference: my binding uses "eeprom" while Ansuel went
with "precal". I found a lot of "eeprom" references and only one
"precal". If you think however "precal" fits better please comment.
---
 .../bindings/net/wireless/mediatek,mt76.yaml         | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml b/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml
index 67b63f119f64..0500caa4107c 100644
--- a/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml
+++ b/Documentation/devicetree/bindings/net/wireless/mediatek,mt76.yaml
@@ -71,6 +71,14 @@ properties:
 
   ieee80211-freq-limit: true
 
+  nvmem-cells:
+    items:
+      - description: NVMEM cell with EEPROM
+
+  nvmem-cell-names:
+    items:
+      - const: eeprom
+
   mediatek,eeprom-data:
     $ref: /schemas/types.yaml#/definitions/uint32-array
     description:
@@ -84,6 +92,7 @@ properties:
           - description: offset containing EEPROM data
     description:
       Phandle to a MTD partition + offset containing EEPROM data
+    deprecated: true
 
   big-endian:
     $ref: /schemas/types.yaml#/definitions/flag
@@ -258,7 +267,8 @@ examples:
       interrupt-parent = <&cpuintc>;
       interrupts = <6>;
 
-      mediatek,mtd-eeprom = <&factory 0x0>;
+      nvmem-cells = <&eeprom>;
+      nvmem-cell-names = "eeprom";
     };
 
   - |
-- 
2.35.3