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rockchip: Add option to prevent booting on power plug-in

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For Rockchip boards with the all rk8xx series PMICs (excluding the
rk808), it is sometimes desirable to not boot whenever the device is
plugged in. An example would be for the Odroid Go Advance.

This provides a configurable option to check the PMIC says it was
powered because of a plug-in event. 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.

This patch parallels the work done in the following patch series:
https://lore.kernel.org/u-boot/20220121133732.2397273-1-andre.przywara@arm.com/

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
This commit is contained in:
Chris Morgan 2022-05-27 13:18:20 -05:00 committed by Kever Yang
parent ad607512f5
commit 30975fb73d
3 changed files with 47 additions and 0 deletions
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10
arch/arm/mach-rockchip/Kconfig
View File

@ -361,6 +361,16 @@ config ROCKCHIP_BOOT_MODE_REG
The Soc will enter to different boot mode(defined in asm/arch-rockchip/boot_mode.h)
according to the value from this register.
config ROCKCHIP_RK8XX_DISABLE_BOOT_ON_POWERON
bool "Disable device boot on power plug-in"
depends on PMIC_RK8XX
default n
---help---
Say Y here to prevent the device from booting up because of a plug-in
event. When set, the device will boot 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 ROCKCHIP_STIMER
bool "Rockchip STIMER support"
default y

34
drivers/power/pmic/rk8xx.c
View File

@ -51,6 +51,38 @@ U_BOOT_DRIVER(rk8xx_sysreset) = {
.ops = &rk8xx_sysreset_ops,
};
/* In the event of a plug-in and the appropriate option has been
* selected, we simply shutdown instead of continue the normal boot
* process. Please note the rk808 is not supported as it doesn't
* have the appropriate register.
*/
void rk8xx_off_for_plugin(struct udevice *dev)
{
struct rk8xx_priv *priv = dev_get_priv(dev);
switch (priv->variant) {
case RK805_ID:
case RK816_ID:
case RK818_ID:
if (pmic_reg_read(dev, RK8XX_ON_SOURCE) & RK8XX_ON_PLUG_IN) {
printf("Power Off due to plug-in event\n");
pmic_clrsetbits(dev, REG_DEVCTRL, 0, BIT(0));
}
break;
case RK809_ID:
case RK817_ID:
if (pmic_reg_read(dev, RK817_ON_SOURCE) & RK8XX_ON_PLUG_IN) {
printf("Power Off due to plug-in event\n");
pmic_clrsetbits(dev, RK817_REG_SYS_CFG3, 0,
BIT(0));
}
break;
default:
printf("PMIC RK%x: Cannot read boot reason.\n",
priv->variant);
}
}
static struct reg_data rk817_init_reg[] = {
/* enable the under-voltage protection,
* the under-voltage protection will shutdown the LDO3 and reset the PMIC
@ -211,6 +243,8 @@ static int rk8xx_probe(struct udevice *dev)
pmic_reg_read(dev, on_source),
pmic_reg_read(dev, off_source));
printf("\n");
if (CONFIG_IS_ENABLED(ROCKCHIP_RK8XX_DISABLE_BOOT_ON_POWERON))
rk8xx_off_for_plugin(dev);
return 0;
}

3
include/power/rk8xx_pmic.h
View File

@ -214,6 +214,9 @@ enum {
#define RK817_ON_SOURCE 0xf5
#define RK817_OFF_SOURCE 0xf6
#define RK8XX_ON_PWRON BIT(7)
#define RK8XX_ON_PLUG_IN BIT(6)
struct reg_data {
u8 reg;
u8 val;