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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
This commit is contained in:
Samuel Holland 2020-12-13 22:43:15 -06:00
parent d6fdb52b9c
commit 4470298333
2 changed files with 11 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/drivers/allwinner/axp.h
View File

@ -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 {

12
plat/allwinner/sun50i_a64/sunxi_power.c
View File

@ -97,11 +97,8 @@ static int rsb_init(void)
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 @@ int sunxi_pmic_setup(uint16_t socid, const void *fdt)
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;