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

[Hans de Goede]

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 at 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