From: Chris Morgan macromorgan@hotmail.com
For sunxi boards with the AXP209, AXP221, AXP809, and AXP818 PMICs (plus possibly others, I only confirmed the datasheets for these), it is sometimes desirable to not power up whenever the device is plugged in. An example would be when using the NTC CHIP inside a PocketCHIP. This provides a configurable option to check if bit 0 of register 0 of the PMIC says it was powered because of a power button press (0) or a plug-in event (1). If the value is 1 and this option is selected, the device shuts down shortly after printing a message to console stating the reason why it's shutting down. Powering up the board with the power button is not affected.
Signed-off-by: Chris Morgan macromorgan@hotmail.com --- arch/arm/mach-sunxi/Kconfig | 10 ++++++++++ board/sunxi/board.c | 17 ++++++++++++++++++ 2 files changed, 27 insertions(+)
diff --git a/arch/arm/mach-sunxi/Kconfig b/arch/arm/mach-sunxi/Kconfig index 2c18cf02d1..d94046dc54 100644 --- a/arch/arm/mach-sunxi/Kconfig +++ b/arch/arm/mach-sunxi/Kconfig @@ -785,6 +785,16 @@ config AXP_GPIO ---help--- Say Y here to enable support for the gpio pins of the axp PMIC ICs.
+config AXP_DISABLE_POWERON_VIN + bool "Disable device power-on when plugged in" + depends on AXP209_POWER || AXP221_POWER || AXP809_POWER || AXP818_POWER + default n + ---help--- + Say Y here to prevent the device from powering up because of a plug-in + event. When set, the device will power on briefly to determine why it + was powered on, and if it was determined because of a plug-in event + instead of a button press event it will shut back off. + config VIDEO_SUNXI bool "Enable graphical uboot console on HDMI, LCD or VGA" depends on !MACH_SUN8I_A83T diff --git a/board/sunxi/board.c b/board/sunxi/board.c index fdbcd40269..9f656b56f1 100644 --- a/board/sunxi/board.c +++ b/board/sunxi/board.c @@ -27,6 +27,7 @@ #include <asm/arch/dram.h> #include <asm/arch/mmc.h> #include <asm/arch/prcm.h> +#include <asm/arch/pmic_bus.h> #include <asm/arch/spl.h> #include <asm/global_data.h> #include <linux/delay.h> @@ -586,6 +587,7 @@ static void sunxi_spl_store_dram_size(phys_addr_t dram_size) void sunxi_board_init(void) { int power_failed = 0; + __maybe_unused u8 boot_reason;
#ifdef CONFIG_LED_STATUS if (IS_ENABLED(CONFIG_SPL_DRIVERS_MISC)) @@ -601,6 +603,21 @@ void sunxi_board_init(void) defined CONFIG_AXP809_POWER || defined CONFIG_AXP818_POWER power_failed = axp_init();
+#if IS_ENABLED(CONFIG_AXP_DISABLE_POWERON_VIN) +/* This behavior (bit(0) of register 0x00 and shutdown by setting bit(7) of + * register 0x32 appears to be common to many AXP chips, at least according to + * the datasheets of the AXP209, the AXP221, the AXP803, the AXP809, and the + * AXP818. + */ + if (!power_failed) { + pmic_bus_read(AXP_POWER_STATUS, &boot_reason); + if (boot_reason & BIT(0)) { + printf("Power on by charger, shutting down.\n"); + pmic_bus_write(0x32, BIT(7)); + } + } +#endif + #if defined CONFIG_AXP221_POWER || defined CONFIG_AXP809_POWER || \ defined CONFIG_AXP818_POWER power_failed |= axp_set_dcdc1(CONFIG_AXP_DCDC1_VOLT);