[PATCH v2 2/2] rockchip: Add option to prevent booting on power plug-in

[Jaehoon Chung]

On 5/28/22 03:18, Chris Morgan wrote:
> From: Chris Morgan <macromorgan at hotmail.com>
> 
> 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 at hotmail.com>

Reviewed-by: Jaehoon Chung <jh80.chung at samsung.com>

Best Regards,
Jaehoon Chung

> ---
>  arch/arm/mach-rockchip/Kconfig | 10 ++++++++++
>  drivers/power/pmic/rk8xx.c     | 34 ++++++++++++++++++++++++++++++++++
>  include/power/rk8xx_pmic.h     |  3 +++
>  3 files changed, 47 insertions(+)
> 
> diff --git a/arch/arm/mach-rockchip/Kconfig b/arch/arm/mach-rockchip/Kconfig
> index 18aff5480b..c561a77e6a 100644
> --- a/arch/arm/mach-rockchip/Kconfig
> +++ b/arch/arm/mach-rockchip/Kconfig
> @@ -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
> diff --git a/drivers/power/pmic/rk8xx.c b/drivers/power/pmic/rk8xx.c
> index 1ffbecc02a..25ef621f8d 100644
> --- a/drivers/power/pmic/rk8xx.c
> +++ b/drivers/power/pmic/rk8xx.c
> @@ -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;
>  }
> diff --git a/include/power/rk8xx_pmic.h b/include/power/rk8xx_pmic.h
> index 8ff0af35c5..3cbfc02195 100644
> --- a/include/power/rk8xx_pmic.h
> +++ b/include/power/rk8xx_pmic.h
> @@ -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;