linux-kernel - [PATCH v2 1/2] dt-bindings: nvmem: mediatek: efuse: split MT8186/MT8188 from base version

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Message-ID: <20250610063431.2955757-2-wenst@chromium.org>
Date: Tue, 10 Jun 2025 14:34:29 +0800
From: Chen-Yu Tsai <wenst@...omium.org>
To: Srinivas Kandagatla <srini@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
	Lala Lin <lala.lin@...iatek.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: Chen-Yu Tsai <wenst@...omium.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Johnson Wang <johnson.wang@...iatek.com>
Subject: [PATCH v2 1/2] dt-bindings: nvmem: mediatek: efuse: split MT8186/MT8188 from base version

On MT8186 and MT8188 one of the NVMEM cells contains the GPU speed bin
value. In combination with the GPU OPP bindings, on these two platforms
there is an implied scheme of converting the cell value to what the GPU
OPP "opp-supported-hw" property matches. This does not apply to the base
mediatek,efuse hardware, nor does it apply to any of the other platforms
that do not have the GPU speed bin cell. The platform maintainer argues
that this makes the compatibles incompatible with the base
"mediatek,efuse" compatible, as shown in the link given.

Deprecate the MT8186/MT8188 + "mediatek,efuse" combination, and add
new entries with MT8186 being the base model and MT8188 falling back
to MT8186.

Link: https://lore.kernel.org/all/11028242-afe4-474a-9d76-cd1bd9208987@collabora.com/
Fixes: ff1df1886f43 ("dt-bindings: nvmem: mediatek: efuse: Add support for MT8188")
Cc: Johnson Wang <johnson.wang@...iatek.com>
Signed-off-by: Chen-Yu Tsai <wenst@...omium.org>
---
 .../bindings/nvmem/mediatek,efuse.yaml          | 17 +++++++++++++++--
 1 file changed, 15 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/nvmem/mediatek,efuse.yaml b/Documentation/devicetree/bindings/nvmem/mediatek,efuse.yaml
index 32b8c1eb4e80..4dc0d42df3e6 100644
--- a/Documentation/devicetree/bindings/nvmem/mediatek,efuse.yaml
+++ b/Documentation/devicetree/bindings/nvmem/mediatek,efuse.yaml
@@ -24,6 +24,21 @@ properties:
 
   compatible:
     oneOf:
+      - items:
+          - const: mediatek,mt8188-efuse
+          - const: mediatek,mt8186-efuse
+      - const: mediatek,mt8186-efuse
+
+      - items:
+          - enum:
+              - mediatek,mt8186-efuse
+              - mediatek,mt8188-efuse
+          - const: mediatek,efuse
+        deprecated: true
+        description: Some compatibles also imply a decoding scheme for the
+          "gpu-speedbin" cell, and thus are not backward compatible to the
+          generic "mediatek,efuse" compatible.
+
       - items:
           - enum:
               - mediatek,mt7622-efuse
@@ -33,8 +48,6 @@ properties:
               - mediatek,mt7988-efuse
               - mediatek,mt8173-efuse
               - mediatek,mt8183-efuse
-              - mediatek,mt8186-efuse
-              - mediatek,mt8188-efuse
               - mediatek,mt8192-efuse
               - mediatek,mt8195-efuse
               - mediatek,mt8516-efuse
-- 
2.50.0.rc0.604.gd4ff7b7c86-goog