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From: Chen-Yu Tsai <wens@csie.org>
To: Maxime Ripard <maxime.ripard@bootlin.com>
Cc: devicetree@vger.kernel.org,
	Sergey Matyukevich <geomatsi@gmail.com>,
	Andre Przywara <andre.przywara@arm.com>,
	Chen-Yu Tsai <wens@csie.org>,
	linux-kernel@vger.kernel.org, Emmanuel Vadot <manu@freebsd.org>,
	linux-sunxi@googlegroups.com,
	Jagan Teki <jagan@amarulasolutions.com>,
	Hauke Mehrtens <hauke@hauke-m.de>,
	linux-arm-kernel@lists.infradead.org,
	Icenowy Zheng <icenowy@aosc.io>
Subject: [PATCH 01/10] ARM: dts: sunxi: bananapi-m2-plus-v1.2: Fix CPU supply voltages
Date: Wed, 30 Jan 2019 16:41:54 +0800
Message-ID: <20190130084203.25053-2-wens@csie.org> (raw)
In-Reply-To: <20190130084203.25053-1-wens@csie.org>

The Bananapi M2+ uses a GPIO line to change the effective resistance of
the CPU supply regulator's feedback resistor network. The voltages
described in the device tree were given directly by the vendor. This
turns out to be slightly off compared to the real values.

The updated voltages are based on calculations of the feedback resistor
network, and verified down to three decimal places with a multi-meter.

Fixes: 6eeb4180d4b9 ("ARM: dts: sunxi: h3-h5: Add Bananapi M2+ v1.2 device trees")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
---
 arch/arm/boot/dts/sunxi-bananapi-m2-plus-v1.2.dtsi | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/arch/arm/boot/dts/sunxi-bananapi-m2-plus-v1.2.dtsi b/arch/arm/boot/dts/sunxi-bananapi-m2-plus-v1.2.dtsi
index 53edd1faee99..a567567763f4 100644
--- a/arch/arm/boot/dts/sunxi-bananapi-m2-plus-v1.2.dtsi
+++ b/arch/arm/boot/dts/sunxi-bananapi-m2-plus-v1.2.dtsi
@@ -16,13 +16,13 @@
 		regulator-type = "voltage";
 		regulator-boot-on;
 		regulator-always-on;
-		regulator-min-microvolt = <1100000>;
-		regulator-max-microvolt = <1300000>;
+		regulator-min-microvolt = <1108475>;
+		regulator-max-microvolt = <1308475>;
 		regulator-ramp-delay = <50>; /* 4ms */
 		gpios = <&r_pio 0 1 GPIO_ACTIVE_HIGH>; /* PL1 */
 		gpios-states = <0x1>;
-		states = <1100000 0x0
-			  1300000 0x1>;
+		states = <1108475 0x0
+			  1308475 0x1>;
 	};
 };
 
-- 
2.20.1


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Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-30  8:41 [PATCH 00/10] arm64: dts: allwinner: h5: Enable CPU DVFS (cpufreq) Chen-Yu Tsai
2019-01-30  8:41 ` Chen-Yu Tsai [this message]
2019-01-30  8:41 ` [PATCH 02/10] ARM: dts: bananapi-m2-plus: Add CPU supply regulator Chen-Yu Tsai
2019-01-30  8:41 ` [PATCH 03/10] arm64: dts: allwinner: h5: Hook up cpu regulator supplies Chen-Yu Tsai
2019-01-30  8:41 ` [PATCH 04/10] arm64: dts: allwinner: h5: nanopi-neo2: Add CPU regulator supply Chen-Yu Tsai
2019-01-30  8:41 ` [PATCH 05/10] arm64: dts: allwinner: h5: orange-pi-zero-plus: " Chen-Yu Tsai
2019-01-30  8:41 ` [PATCH 06/10] arm64: dts: allwinner: h5: orange-pi-zero-plus2: " Chen-Yu Tsai
2019-01-30  8:42 ` [PATCH 07/10] arm64: dts: allwinner: h5: orange-pi-pc2: " Chen-Yu Tsai
2019-01-30  8:42 ` [PATCH 08/10] arm64: dts: allwinner: h5: orange-pi-prime: " Chen-Yu Tsai
2019-01-30  8:42 ` [PATCH 09/10] arm64: dts: allwinner: h5: Add clock to CPU cores Chen-Yu Tsai
2019-01-30  8:42 ` [PATCH 10/10] arm64: dts: allwinner: h5: Add CPU Operating Performance Points table Chen-Yu Tsai
2019-01-30  9:29   ` Maxime Ripard
2019-01-30  9:41     ` Chen-Yu Tsai
2019-01-30  9:59       ` Maxime Ripard
2019-01-31  3:28       ` Chen-Yu Tsai
2019-09-02 14:03 ` [PATCH 00/10] arm64: dts: allwinner: h5: Enable CPU DVFS (cpufreq) Ondřej Jirman

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