sunxi: Implement poweroff support for axp221 pmic

Adds poweroff support for axp221 pmic.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>

drivers/power/Kconfig

@@ -36,6 +36,7 @@ config AXP209_POWER
 config AXP221_POWER
 	boolean "axp221 / axp223 pmic support"
 	depends on MACH_SUN6I || MACH_SUN8I_A23 || MACH_SUN8I_A33
+	select CMD_POWEROFF
 	---help---
 	Select this to enable support for the axp221/axp223 pmic found on most
 	A23 and A31 boards.

drivers/power/axp221.c

@@ -11,6 +11,7 @@
  */
 
 #include <common.h>
+#include <command.h>
 #include <errno.h>
 #include <asm/arch/pmic_bus.h>
 #include <axp_pmic.h>
@@ -312,3 +313,14 @@ int axp_get_sid(unsigned int *sid)
 
 	return 0;
 }
+
+int do_poweroff(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
+{
+	pmic_bus_write(AXP221_SHUTDOWN, AXP221_SHUTDOWN_POWEROFF);
+
+	/* infinite loop during shutdown */
+	while (1) {}
+
+	/* not reached */
+	return 0;
+}

include/axp221.h

@@ -45,6 +45,8 @@
 #define AXP221_ALDO3_CTRL	0x2a
 #define AXP221_VBUS_IPSOUT	0x30
 #define AXP221_VBUS_IPSOUT_DRIVEBUS	(1 << 2)
+#define AXP221_SHUTDOWN		0x32
+#define AXP221_SHUTDOWN_POWEROFF	(1 << 7)
 #define AXP221_MISC_CTRL	0x8f
 #define AXP221_MISC_CTRL_N_VBUSEN_FUNC	(1 << 4)
 #define AXP221_PAGE		0xff