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SY8106A is a PMIC which is used on the Allwinner H3 Orange Pi Pc and Plus board. The VOUT1_SEL register is implemented to set the default V-CPU voltage to 1200 mV. This driver is required to ensure the SY8106A V-CPU voltage is set to 1200 mV after a software reset. On cold boot the default SY8106A output voltage is selected to be 1200 mV by a pair of resistors on the Orange Pi PC and Plus. Signed-off-by: Jelle van der Waa <jelle@vdwaa.nl> Tested-by: Siarhei Siamashka <siarhei.siamashka@gmail.com> Acked-by: Siarhei Siamashka <siarhei.siamashka@gmail.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com>
30 lines
639 B
C
30 lines
639 B
C
/*
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* (C) Copyright 2016
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* Jelle van der Waa <jelle@vdwaa.nl>
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#include <common.h>
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#include <i2c.h>
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#include <sy8106a.h>
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#define SY8106A_I2C_ADDR 0x65
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#define SY8106A_VOUT1_SEL 1
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#define SY8106A_VOUT1_SEL_ENABLE (1 << 7)
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static u8 sy8106a_mvolt_to_cfg(int mvolt, int min, int max, int div)
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{
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if (mvolt < min)
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mvolt = min;
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else if (mvolt > max)
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mvolt = max;
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return (mvolt - min) / div;
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}
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int sy8106a_set_vout1(unsigned int mvolt)
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{
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u8 data = sy8106a_mvolt_to_cfg(mvolt, 680, 1950, 10) | SY8106A_VOUT1_SEL_ENABLE;
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return i2c_write(SY8106A_I2C_ADDR, SY8106A_VOUT1_SEL, 1, &data, 1);
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}
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