linux-kernel - [PATCH v2 2/4] arm64: dts: exynos: gs101-pixel-common: add Maxim MAX77759 PMIC

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Message-Id: <20250524-b4-max77759-mfd-dts-v2-2-b479542eb97d@linaro.org>
Date: Sat, 24 May 2025 06:21:29 +0100
From: André Draszik <andre.draszik@...aro.org>
To: Catalin Marinas <catalin.marinas@....com>, 
 Will Deacon <will@...nel.org>, Peter Griffin <peter.griffin@...aro.org>, 
 Tudor Ambarus <tudor.ambarus@...aro.org>, Rob Herring <robh@...nel.org>, 
 Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Alim Akhtar <alim.akhtar@...sung.com>
Cc: Will McVicker <willmcvicker@...gle.com>, kernel-team@...roid.com, 
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
 linux-samsung-soc@...r.kernel.org, devicetree@...r.kernel.org, 
 André Draszik <andre.draszik@...aro.org>
Subject: [PATCH v2 2/4] arm64: dts: exynos: gs101-pixel-common: add Maxim
 MAX77759 PMIC

On Pixel 6 (and Pro), a MAX77759 companion PMIC for USB Type-C
applications is used, which contains four functional blocks (at
distinct I2C addresses):
  * top (including GPIO & NVMEM)
  * charger
  * fuel gauge
  * TCPCi

This change adds the PMIC and the subnodes for the GPIO expander and
NVMEM, and defines the NVMEM layout.

The NVMEM layout is declared such that it matches downstream's
open-coded configuration [1].

Note:
The pinctrl nodes are kept sorted by the 'samsung,pins' property rather
than node name, as I think that makes it easier to look at and to add
new nodes unambiguously in the future. Its label is prefixed with 'if'
(for interface), because there are three PMICs in total in use on
Pixel 6 (Pro).

Link: https://android.googlesource.com/kernel/google-modules/bms/+/96e729a83817/max77759_maxq.c#67 [1]
Signed-off-by: André Draszik <andre.draszik@...aro.org>

---
v2:
- update commit message slightly
---
 .../boot/dts/exynos/google/gs101-pixel-common.dtsi | 61 ++++++++++++++++++++++
 1 file changed, 61 insertions(+)

diff --git a/arch/arm64/boot/dts/exynos/google/gs101-pixel-common.dtsi b/arch/arm64/boot/dts/exynos/google/gs101-pixel-common.dtsi
index d6ddcc13f7b20c6dfbe92e86abafe965870d0c78..de5c8d236b705505c0745827c5c6b67d94ba6227 100644
--- a/arch/arm64/boot/dts/exynos/google/gs101-pixel-common.dtsi
+++ b/arch/arm64/boot/dts/exynos/google/gs101-pixel-common.dtsi
@@ -188,6 +188,60 @@ usbc0_role_sw: endpoint {
 			};
 		};
 	};
+
+	pmic@66 {
+		compatible = "maxim,max77759";
+		reg = <0x66>;
+
+		pinctrl-0 = <&if_pmic_int>;
+		pinctrl-names = "default";
+		interrupts-extended = <&gpa8 3 IRQ_TYPE_LEVEL_LOW>;
+
+		interrupt-controller;
+		#interrupt-cells = <2>;
+
+		gpio {
+			compatible = "maxim,max77759-gpio";
+
+			gpio-controller;
+			#gpio-cells = <2>;
+			/*
+			 * "Human-readable name [SIGNAL_LABEL]" where the
+			 * latter comes from the schematic
+			 */
+			gpio-line-names = "OTG boost [OTG_BOOST_EN]",
+					  "max20339 IRQ [MW_OVP_INT_L]";
+
+			interrupt-controller;
+			#interrupt-cells = <2>;
+		};
+
+		nvmem-0 {
+			compatible = "maxim,max77759-nvmem";
+
+			nvmem-layout {
+				compatible = "fixed-layout";
+				#address-cells = <1>;
+				#size-cells = <1>;
+
+				reboot-mode@0 {
+					reg = <0x0 0x4>;
+				};
+
+				boot-reason@4 {
+					reg = <0x4 0x4>;
+				};
+
+				shutdown-user-flag@8 {
+					reg = <0x8 0x1>;
+				};
+
+				rsoc@a {
+					reg = <0xa 0x2>;
+				};
+			};
+		};
+	};
 };
 
 &pinctrl_far_alive {
@@ -211,6 +265,13 @@ typec_int: typec-int-pins {
 		samsung,pin-pud = <GS101_PIN_PULL_UP>;
 		samsung,pin-drv = <GS101_PIN_DRV_2_5_MA>;
 	};
+
+	if_pmic_int: if-pmic-int-pins {
+		samsung,pins = "gpa8-3";
+		samsung,pin-function = <GS101_PIN_FUNC_EINT>;
+		samsung,pin-pud = <GS101_PIN_PULL_UP>;
+		samsung,pin-drv = <GS101_PIN_DRV_2_5_MA>;
+	};
 };
 
 &pinctrl_gpio_alive {

-- 
2.49.0.1151.ga128411c76-goog