mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-08-22 09:58:52 +09:00
![Jelle van der Waa](/assets/img/avatar_default.png)
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
/*
|
|
* (C) Copyright 2016
|
|
* Jelle van der Waa <jelle@vdwaa.nl>
|
|
*
|
|
* SPDX-License-Identifier: GPL-2.0+
|
|
*/
|
|
#include <common.h>
|
|
#include <i2c.h>
|
|
#include <sy8106a.h>
|
|
|
|
#define SY8106A_I2C_ADDR 0x65
|
|
#define SY8106A_VOUT1_SEL 1
|
|
#define SY8106A_VOUT1_SEL_ENABLE (1 << 7)
|
|
|
|
static u8 sy8106a_mvolt_to_cfg(int mvolt, int min, int max, int div)
|
|
{
|
|
if (mvolt < min)
|
|
mvolt = min;
|
|
else if (mvolt > max)
|
|
mvolt = max;
|
|
|
|
return (mvolt - min) / div;
|
|
}
|
|
|
|
int sy8106a_set_vout1(unsigned int mvolt)
|
|
{
|
|
u8 data = sy8106a_mvolt_to_cfg(mvolt, 680, 1950, 10) | SY8106A_VOUT1_SEL_ENABLE;
|
|
return i2c_write(SY8106A_I2C_ADDR, SY8106A_VOUT1_SEL, 1, &data, 1);
|
|
}
|