allwinner: Return the PMIC to I2C mode after use
This gives the rich OS the flexibility to choose between I2C and RSB
communication. Since a runtime address can only be assigned once after
entering RSB mode, it also lets the rich OS choose any runtime address.
Signed-off-by: Samuel Holland <samuel@sholland.org>
Change-Id: Id49c124c5e925985fc31c0ba38c7fb6c941aafa8
diff --git a/include/drivers/allwinner/axp.h b/include/drivers/allwinner/axp.h
index 9c0035f..222820b 100644
--- a/include/drivers/allwinner/axp.h
+++ b/include/drivers/allwinner/axp.h
@@ -9,6 +9,10 @@
#include <stdint.h>
+#define AXP20X_MODE_REG 0x3e
+#define AXP20X_MODE_I2C 0x00
+#define AXP20X_MODE_RSB 0x7c
+
#define NA 0xff
enum {
diff --git a/plat/allwinner/sun50i_a64/sunxi_power.c b/plat/allwinner/sun50i_a64/sunxi_power.c
index 8aa610c..80a69c3 100644
--- a/plat/allwinner/sun50i_a64/sunxi_power.c
+++ b/plat/allwinner/sun50i_a64/sunxi_power.c
@@ -97,11 +97,8 @@
if (ret)
return ret;
- /*
- * Initiate an I2C transaction to write 0x7c into register 0x3e,
- * switching the PMIC to RSB mode.
- */
- ret = rsb_set_device_mode(0x7c3e00);
+ /* Initiate an I2C transaction to switch the PMIC to RSB mode. */
+ ret = rsb_set_device_mode(AXP20X_MODE_RSB << 16 | AXP20X_MODE_REG << 8);
if (ret)
return ret;
@@ -151,6 +148,11 @@
pmic = AXP803_RSB;
axp_setup_regulators(fdt);
+ /* Switch the PMIC back to I2C mode. */
+ ret = axp_write(AXP20X_MODE_REG, AXP20X_MODE_I2C);
+ if (ret)
+ return ret;
+
break;
default:
return -ENODEV;