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sunxi: axp221: Add support for controlling the drivebus pin 

The axp221 / axp223's N_VBUSEN pin can be configured as an output rather
then an input, add axp_drivebus_enable() and _disable() functions to set
the pin in output mode and control it.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
utp
Hans de Goede 2015-01-11 19:58:03 +01:00
parent 3c781190d1
commit 2abac6213d
2 changed files with 45 additions and 0 deletions
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36
drivers/power/axp221.c
View File

@ -353,3 +353,39 @@ int axp221_get_sid(unsigned int *sid)
return 0;
}
static int axp_drivebus_setup(void)
{
int ret;
ret = axp221_init();
if (ret)
return ret;
/* Set N_VBUSEN pin to output / DRIVEBUS function */
return axp221_clrbits(AXP221_MISC_CTRL, AXP221_MISC_CTRL_N_VBUSEN_FUNC);
}
int axp_drivebus_enable(void)
{
int ret;
ret = axp_drivebus_setup();
if (ret)
return ret;
/* Set DRIVEBUS high */
return axp221_setbits(AXP221_VBUS_IPSOUT, AXP221_VBUS_IPSOUT_DRIVEBUS);
}
int axp_drivebus_disable(void)
{
int ret;
ret = axp_drivebus_setup();
if (ret)
return ret;
/* Set DRIVEBUS low */
return axp221_clrbits(AXP221_VBUS_IPSOUT, AXP221_VBUS_IPSOUT_DRIVEBUS);
}

9
include/axp221.h
View File

@ -45,11 +45,18 @@
#define AXP221_ALDO1_CTRL 0x28
#define AXP221_ALDO2_CTRL 0x29
#define AXP221_ALDO3_CTRL 0x2a
#define AXP221_VBUS_IPSOUT 0x30
#define AXP221_VBUS_IPSOUT_DRIVEBUS (1 << 2)
#define AXP221_MISC_CTRL 0x8f
#define AXP221_MISC_CTRL_N_VBUSEN_FUNC (1 << 4)
#define AXP221_PAGE 0xff
/* Page 1 addresses */
#define AXP221_SID 0x20
/* We support drivebus control */
#define AXP_DRIVEBUS
int axp221_set_dcdc1(unsigned int mvolt);
int axp221_set_dcdc2(unsigned int mvolt);
int axp221_set_dcdc3(unsigned int mvolt);
@ -64,3 +71,5 @@ int axp221_set_aldo2(unsigned int mvolt);
int axp221_set_aldo3(unsigned int mvolt);
int axp221_init(void);
int axp221_get_sid(unsigned int *sid);
int axp_drivebus_enable(void);
int axp_drivebus_disable(void);