linux-kernel - [PATCH v2] arm64: dts: rockchip: add attiny_rst

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Message-Id: <20240926132028.21910-1-jakob.unterwurzacher@cherry.de>
Date: Thu, 26 Sep 2024 15:20:30 +0200
From: Jakob Unterwurzacher <jakobunt@...il.com>
To: quentin.schulz@...rry.de
Cc: heiko@...ech.de,
	jakobunt@...il.com,
	linux-kernel@...r.kernel.org,
	linux-rockchip@...ts.infradead.org,
	Jakob Unterwurzacher <jakob.unterwurzacher@...rry.de>
Subject: [PATCH v2] arm64: dts: rockchip: add attiny_rst_gate to Ringneck

Ringneck v1.4 can contain (placement option) an on-board ATtiny
microcontroller instead of an STM32. In normal operation, this
is transparent to the software, as both microcontrollers emulate
the same ICs (amc6821 and isl1208).

For flashing the ATtiny, the SWITCH_REG1 regulator of the board's PMIC is
used to enable the ATtiny UPDI debug interface. If the STM32 is placed, or if
we are running on an older Ringneck revision, SWITCH_REG1 is not connected
and has no effect.

Add attiny-updi-gate-regulator so userspace can control it via sysfs
(needs CONFIG_REGULATOR_USERSPACE_CONSUMER):

  echo enabled > /sys/devices/platform/attiny-updi-gate-regulator/state

Signed-off-by: Jakob Unterwurzacher <jakob.unterwurzacher@...rry.de>
Tested-by: Quentin Schulz <quentin.schulz@...rry.de>
---
v2: remove vcc8-supply

 arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi b/arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi
index bb1aea82e666e..216a6b6a6ee74 100644
--- a/arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi
+++ b/arch/arm64/boot/dts/rockchip/px30-ringneck.dtsi
@@ -15,6 +15,12 @@ aliases {
 		rtc1 = &rk809;
 	};
 
+	/* allows userspace to control the gate of the ATtiny UPDI pass FET via sysfs */
+	attiny-updi-gate-regulator {
+		compatible = "regulator-output";
+		vout-supply = <&vg_attiny_updi>;
+	};
+
 	emmc_pwrseq: emmc-pwrseq {
 		compatible = "mmc-pwrseq-emmc";
 		pinctrl-0 = <&emmc_reset>;
@@ -281,6 +287,11 @@ regulator-state-mem {
 					regulator-suspend-microvolt = <1800000>;
 				};
 			};
+
+			/* supplies the gate of the ATtiny UPDI pass FET */
+			vg_attiny_updi: SWITCH_REG1 {
+				regulator-name = "vg_attiny_updi";
+			};
 		};
 	};
 };
-- 
2.39.2