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sunxi: axp221: Add VBUS detection support

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Some of the AXP PMICs support VBUS detection, i.e. checking whether
VBUS power input is available and usable (supplied by an external
source). A few boards use this instead of a separate GPIO to detect
VBUS on USB OTG.

Signed-off-by: Chen-Yu Tsai <wens@csie.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
This commit is contained in:
Chen-Yu Tsai 2015-03-09 15:44:15 +08:00 committed by Hans de Goede
parent 5112703fdd
commit 1986c4ca0b
2 changed files with 23 additions and 0 deletions
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16
drivers/power/axp221.c
View File

@ -385,6 +385,22 @@ int axp221_get_sid(unsigned int *sid)
return 0;
}
int axp_get_vbus(void)
{
int ret;
u8 val;
ret = axp221_init();
if (ret)
return ret;
ret = pmic_bus_read(AXP221_POWER_STATUS, &val);
if (ret)
return ret;
return (val & AXP221_POWER_STATUS_VBUS_USABLE) ? 1 : 0;
}
static int axp_drivebus_setup(void)
{
int ret;

7
include/axp221.h
View File

@ -14,6 +14,9 @@
#define AXP223_RUNTIME_ADDR 0x2d
/* Page 0 addresses */
#define AXP221_POWER_STATUS 0x00
#define AXP221_POWER_STATUS_VBUS_AVAIL (1 << 5)
#define AXP221_POWER_STATUS_VBUS_USABLE (1 << 4)
#define AXP221_CHIP_ID 0x03
#define AXP221_OUTPUT_CTRL1 0x10
#define AXP221_OUTPUT_CTRL1_DCDC0_EN (1 << 0)
@ -59,6 +62,9 @@
/* Page 1 addresses */
#define AXP221_SID 0x20
/* We support vbus detection */
#define AXP_VBUS_DETECT
/* We support drivebus control */
#define AXP_DRIVEBUS
@ -77,5 +83,6 @@ int axp221_set_aldo3(unsigned int mvolt);
int axp221_set_eldo(int eldo_num, unsigned int mvolt);
int axp221_init(void);
int axp221_get_sid(unsigned int *sid);
int axp_get_vbus(void);
int axp_drivebus_enable(void);
int axp_drivebus_disable(void);