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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>
Hans de Goede 9 years ago
parent
commit
2abac6213d
2 changed files with 45 additions and 0 deletions
  1. 36 0
      drivers/power/axp221.c
  2. 9 0
      include/axp221.h

+ 36 - 0
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);
+}

+ 9 - 0
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);