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e4dae01bf0
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: 6eeb4180d4 ("ARM: dts: sunxi: h3-h5: Add Bananapi M2+ v1.2 device trees")
Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20200717160053.31191-4-wens@kernel.org
42 lines
847 B
Text
42 lines
847 B
Text
// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
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/*
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* Copyright (C) 2018 Chen-Yu Tsai <wens@csie.org>
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*/
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#include "sunxi-bananapi-m2-plus.dtsi"
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/ {
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/*
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* Bananapi M2+ v1.2 uses a GPIO line to change the effective
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* resistance on the CPU regulator's feedback pin.
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*/
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reg_vdd_cpux: vdd-cpux {
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compatible = "regulator-gpio";
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regulator-name = "vdd-cpux";
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regulator-type = "voltage";
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regulator-boot-on;
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regulator-always-on;
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regulator-min-microvolt = <1108475>;
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regulator-max-microvolt = <1308475>;
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regulator-ramp-delay = <50>; /* 4ms */
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gpios = <&r_pio 0 1 GPIO_ACTIVE_HIGH>; /* PL1 */
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gpios-states = <0x1>;
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states = <1108475 0>, <1308475 1>;
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};
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};
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&cpu0 {
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cpu-supply = <®_vdd_cpux>;
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};
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&cpu1 {
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cpu-supply = <®_vdd_cpux>;
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};
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&cpu2 {
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cpu-supply = <®_vdd_cpux>;
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};
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&cpu3 {
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cpu-supply = <®_vdd_cpux>;
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};
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