From 2abac6213d9d05c34fba7dcaa2934668774008a7 Mon Sep 17 00:00:00 2001 From: Hans de Goede Date: Sun, 11 Jan 2015 19:58:03 +0100 Subject: [PATCH] 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 Acked-by: Ian Campbell --- drivers/power/axp221.c | 36 ++++++++++++++++++++++++++++++++++++ include/axp221.h | 9 +++++++++ 2 files changed, 45 insertions(+) diff --git a/drivers/power/axp221.c b/drivers/power/axp221.c index 728727b48e..4c86f099a2 100644 --- a/drivers/power/axp221.c +++ b/drivers/power/axp221.c @@ -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); +} diff --git a/include/axp221.h b/include/axp221.h index e9552f65fe..e6639f1ffe 100644 --- a/include/axp221.h +++ b/include/axp221.h @@ -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); -- 2.30.2