linux-kernel - Re: [PATCH v5 5/6] mfd: tps6586x: use devm-based power off handler

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Message-ID: <20230420140256.GG996918@google.com>
Date:   Thu, 20 Apr 2023 15:02:56 +0100
From:   Lee Jones <lee@...nel.org>
To:     Benjamin Bara <bbara93@...il.com>
Cc:     Wolfram Sang <wsa@...nel.org>, rafael.j.wysocki@...el.com,
        dmitry.osipenko@...labora.com, peterz@...radead.org,
        jonathanh@...dia.com, richard.leitner@...ux.dev,
        treding@...dia.com, linux-kernel@...r.kernel.org,
        linux-i2c@...r.kernel.org, linux-tegra@...r.kernel.org,
        Benjamin Bara <benjamin.bara@...data.com>
Subject: Re: [PATCH v5 5/6] mfd: tps6586x: use devm-based power off handler

On Tue, 18 Apr 2023, Benjamin Bara wrote:

> From: Benjamin Bara <benjamin.bara@...data.com>
> 
> Convert the power off handler to a devm-based power off handler.
> 
> Signed-off-by: Benjamin Bara <benjamin.bara@...data.com>
> ---
>  drivers/mfd/tps6586x.c | 29 +++++++++++++++++++++--------
>  1 file changed, 21 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/mfd/tps6586x.c b/drivers/mfd/tps6586x.c
> index 2d947f3f606a..226e856e34e0 100644
> --- a/drivers/mfd/tps6586x.c
> +++ b/drivers/mfd/tps6586x.c
> @@ -22,6 +22,7 @@
>  #include <linux/err.h>
>  #include <linux/i2c.h>
>  #include <linux/platform_device.h>
> +#include <linux/reboot.h>
>  #include <linux/regmap.h>
>  #include <linux/of.h>
>  
> @@ -457,13 +458,21 @@ static const struct regmap_config tps6586x_regmap_config = {
>  	.cache_type = REGCACHE_RBTREE,
>  };
>  
> -static struct device *tps6586x_dev;
> -static void tps6586x_power_off(void)
> +static int tps6586x_power_off_handler(struct sys_off_data *data)
>  {
> -	if (tps6586x_clr_bits(tps6586x_dev, TPS6586X_SUPPLYENE, EXITSLREQ_BIT))
> -		return;
> +	int ret;
> +
> +	/* bring pmic into SLEEP state. this takes at least 10ms. */

"Put the PMIC into a sleep state. This takes at least 10sm."

> +	ret = tps6586x_clr_bits(data->dev, TPS6586X_SUPPLYENE, EXITSLREQ_BIT);
> +	if (ret)
> +		return notifier_from_errno(ret);
> +
> +	ret = tps6586x_set_bits(data->dev, TPS6586X_SUPPLYENE, SLEEP_MODE_BIT);
> +	if (ret)
> +		return notifier_from_errno(ret);
>  
> -	tps6586x_set_bits(tps6586x_dev, TPS6586X_SUPPLYENE, SLEEP_MODE_BIT);
> +	mdelay(50);
> +	return notifier_from_errno(-ETIME);
>  }
>  
>  static void tps6586x_print_version(struct i2c_client *client, int version)
> @@ -559,9 +568,13 @@ static int tps6586x_i2c_probe(struct i2c_client *client)
>  		goto err_add_devs;
>  	}
>  
> -	if (pdata->pm_off && !pm_power_off) {
> -		tps6586x_dev = &client->dev;
> -		pm_power_off = tps6586x_power_off;
> +	if (pdata->pm_off) {
> +		ret = devm_register_power_off_handler(&client->dev, &tps6586x_power_off_handler,
> +						      NULL);
> +		if (ret) {
> +			dev_err(&client->dev, "register power off handler failed: %d\n", ret);
> +			goto err_add_devs;
> +		}
>  	}
>  
>  	return 0;
> 
> -- 
> 2.34.1
> 

-- 
Lee Jones [李琼斯]