linux-kernel - [PATCH] arm64: dts: mediatek: mt8188: Add GPU speed bin NVMEM cells

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Message-Id: <20241213-speedbin-v1-1-a0053ead9477@chromium.org>
Date: Fri, 13 Dec 2024 09:29:22 +0000
From: Hsin-Te Yuan <yuanhsinte@...omium.org>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Matthias Brugger <matthias.bgg@...il.com>, 
 AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 linux-arm-kernel@...ts.infradead.org, linux-mediatek@...ts.infradead.org, 
 Hsin-Te Yuan <yuanhsinte@...omium.org>
Subject: [PATCH] arm64: dts: mediatek: mt8188: Add GPU speed bin NVMEM
 cells

On the MT8188, the chip is binned for different GPU voltages at the
highest OPPs. The binning value is stored in the efuse.

Add the NVMEM cell, and tie it to the GPU.

Signed-off-by: Hsin-Te Yuan <yuanhsinte@...omium.org>
---
 arch/arm64/boot/dts/mediatek/mt8188.dtsi | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt8188.dtsi b/arch/arm64/boot/dts/mediatek/mt8188.dtsi
index cd27966d2e3c05833f11294cfa8f6a984d4e0dbc..0e865f5083b475c6e33cf6a0ce51d2b615af7850 100644
--- a/arch/arm64/boot/dts/mediatek/mt8188.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt8188.dtsi
@@ -1752,6 +1752,11 @@ efuse: efuse@...20000 {
 			lvts_efuse_data1: lvts1-calib@1ac {
 				reg = <0x1ac 0x40>;
 			};
+
+			gpu_speedbin: gpu-speedbin@581 {
+				reg = <0x581 0x1>;
+				bits = <0 3>;
+			};
 		};
 
 		gpu: gpu@...00000 {
@@ -1763,6 +1768,8 @@ gpu: gpu@...00000 {
 				     <GIC_SPI 382 IRQ_TYPE_LEVEL_HIGH 0>,
 				     <GIC_SPI 381 IRQ_TYPE_LEVEL_HIGH 0>;
 			interrupt-names = "job", "mmu", "gpu";
+			nvmem-cells = <&gpu_speedbin>;
+			nvmem-cell-names = "speed-bin";
 			operating-points-v2 = <&gpu_opp_table>;
 			power-domains = <&spm MT8188_POWER_DOMAIN_MFG2>,
 					<&spm MT8188_POWER_DOMAIN_MFG3>,

---
base-commit: 1488143f901e04e132722cb093613e8d019a4ec6
change-id: 20241213-speedbin-f339c2648ff0

Best regards,
-- 
Hsin-Te Yuan <yuanhsinte@...omium.org>