linux-kernel - Re: [PATCH] mfd: rk808: RK818 uses DEV

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Message-ID: <5809C76F.4070409@phytec.de>
Date:   Fri, 21 Oct 2016 09:44:47 +0200
From:   Wadim Egorov <w.egorov@...tec.de>
To:     Jianhong Chen <chenjh@...k-chips.com>, zhangqing@...k-chips.com,
        zyw@...k-chips.com
Cc:     lee.jones@...aro.org, linux-kernel@...r.kernel.org,
        linux-rockchip@...ts.infradead.org, tony.xie@...k-chips.com,
        huangtao@...k-chips.com, xsf@...k-chips.com
Subject: Re: [PATCH] mfd: rk808: RK818 uses DEV_OFF to power off supplies

Hi Jianhong,

with this patch a poweroff causes a restart on our board.
In our design a 5V USB voltage is supplied on the USB supply input pins.
After setting DEV_OFF bit, the RK818 restart automatically. The
ON_SOURCE_REG (Address AEH) is 0x40 after the automatic restart which
says that the RK818 was started by ON_PLUG_IN event.
Is there a possibility to configure the RK818 that it will not start
automatically in this case?

Regards,
Wadim

On 17.10.2016 11:03, Jianhong Chen wrote:
> DEV_OFF and DEV_OFF_RST functions for RK808 are designed error that
> only DEV_OFF_RST can power off supplies. RK818 has been fixed this
> issue, so that DEV_OFF is used to power off supplies.
>
> Signed-off-by: Jianhong Chen <chenjh@...k-chips.com>
> ---
>  drivers/mfd/rk808.c       | 23 ++++++++++++++++++++++-
>  include/linux/mfd/rk808.h |  1 +
>  2 files changed, 23 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mfd/rk808.c b/drivers/mfd/rk808.c
> index 0f8acc5..2c9acdb 100644
> --- a/drivers/mfd/rk808.c
> +++ b/drivers/mfd/rk808.c
> @@ -290,6 +290,24 @@ static void rk808_device_shutdown(void)
>  		dev_err(&rk808_i2c_client->dev, "power off error!\n");
>  }
>  
> +static void rk818_device_shutdown(void)
> +{
> +	int ret;
> +	struct rk808 *rk808 = i2c_get_clientdata(rk808_i2c_client);
> +
> +	if (!rk808) {
> +		dev_warn(&rk808_i2c_client->dev,
> +			 "have no rk818, so do nothing here\n");
> +		return;
> +	}
> +
> +	ret = regmap_update_bits(rk808->regmap,
> +				 RK818_DEVCTRL_REG,
> +				 DEV_OFF, DEV_OFF);
> +	if (ret)
> +		dev_err(&rk808_i2c_client->dev, "power off error!\n");
> +}
> +
>  static const struct of_device_id rk808_of_match[] = {
>  	{ .compatible = "rockchip,rk808" },
>  	{ .compatible = "rockchip,rk818" },
> @@ -304,6 +322,7 @@ static int rk808_probe(struct i2c_client *client,
>  	struct rk808 *rk808;
>  	const struct rk808_reg_data *pre_init_reg;
>  	const struct mfd_cell *cells;
> +	void (*pm_pwroff_fn)(void);
>  	int nr_pre_init_regs;
>  	int nr_cells;
>  	int pm_off = 0;
> @@ -331,6 +350,7 @@ static int rk808_probe(struct i2c_client *client,
>  		nr_pre_init_regs = ARRAY_SIZE(rk808_pre_init_reg);
>  		cells = rk808s;
>  		nr_cells = ARRAY_SIZE(rk808s);
> +		pm_pwroff_fn = rk808_device_shutdown;
>  		break;
>  	case RK818_ID:
>  		rk808->regmap_cfg = &rk818_regmap_config;
> @@ -339,6 +359,7 @@ static int rk808_probe(struct i2c_client *client,
>  		nr_pre_init_regs = ARRAY_SIZE(rk818_pre_init_reg);
>  		cells = rk818s;
>  		nr_cells = ARRAY_SIZE(rk818s);
> +		pm_pwroff_fn = rk818_device_shutdown;
>  		break;
>  	default:
>  		dev_err(&client->dev, "Unsupported RK8XX ID %lu\n",
> @@ -393,7 +414,7 @@ static int rk808_probe(struct i2c_client *client,
>  				"rockchip,system-power-controller");
>  	if (pm_off && !pm_power_off) {
>  		rk808_i2c_client = client;
> -		pm_power_off = rk808_device_shutdown;
> +		pm_power_off = pm_pwroff_fn;
>  	}
>  
>  	return 0;
> diff --git a/include/linux/mfd/rk808.h b/include/linux/mfd/rk808.h
> index 6d435a3..83701ef 100644
> --- a/include/linux/mfd/rk808.h
> +++ b/include/linux/mfd/rk808.h
> @@ -290,6 +290,7 @@ enum rk818_reg {
>  #define SWITCH2_EN	BIT(6)
>  #define SWITCH1_EN	BIT(5)
>  #define DEV_OFF_RST	BIT(3)
> +#define DEV_OFF		BIT(0)
>  
>  #define VB_LO_ACT		BIT(4)
>  #define VB_LO_SEL_3500MV	(7 << 0)