[U-Boot] [PATCH 02/17] sunxi: axp221: Add support for controlling the drivebus pin

Hans de Goede
2015-01-11T19:34:40Z

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>
---
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 728727b..4c86f09 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 e9552f6..e6639f1 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);
--
2.1.0