diff options
| author | Jelle van der Waa <jelle@vdwaa.nl> | 2016-02-23 18:47:19 +0100 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2016-02-23 20:50:07 +0100 |
| commit | 0d8382ae70e7559eba873b4d8b2cf9a15aeccf20 (patch) | |
| tree | 1197454051f70f8bb0de9c1b105b0f408ed43e8b /drivers/power/sy8106a.c | |
| parent | 595af9db2422fa5ae734cfe615415b17a5098f34 (diff) | |
| download | u-boot-0d8382ae70e7559eba873b4d8b2cf9a15aeccf20.tar.gz | |
sunxi: power: add support for sy8106a driver
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>
Diffstat (limited to 'drivers/power/sy8106a.c')
| -rw-r--r-- | drivers/power/sy8106a.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/drivers/power/sy8106a.c b/drivers/power/sy8106a.c new file mode 100644 index 0000000000..bbf116f655 --- /dev/null +++ b/drivers/power/sy8106a.c @@ -0,0 +1,29 @@ +/* + * (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); +} |