linux-kernel - Re: [PATCH 2/2] rtc: s35390a: convert to devm_i2c_new_dummy

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Message-ID: <20190829205822.GM21922@piout.net>
Date:   Thu, 29 Aug 2019 22:58:22 +0200
From:   Alexandre Belloni <alexandre.belloni@...tlin.com>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>
Cc:     linux-i2c@...r.kernel.org, Alessandro Zummo <a.zummo@...ertech.it>,
        linux-rtc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] rtc: s35390a: convert to devm_i2c_new_dummy_device()

On 20/08/2019 17:42:38+0200, Wolfram Sang wrote:
> I was about to simplify the call to i2c_unregister_device() when I
> realized that converting to devm_i2c_new_dummy_device() will simplify
> the driver a lot. So I took this approach.
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> ---
> Build tested only, buildbot is happy, too.
> 
> Please apply to your tree.
> 

Isn't that https://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux.git/commit/?h=rtc-next&id=ca83542cdb5c14dd369de2539bdca2670d89feea

>  drivers/rtc/rtc-s35390a.c | 54 ++++++++++-----------------------------
>  1 file changed, 13 insertions(+), 41 deletions(-)
> 
> diff --git a/drivers/rtc/rtc-s35390a.c b/drivers/rtc/rtc-s35390a.c
> index 5826209a3f30..da34cfd70f95 100644
> --- a/drivers/rtc/rtc-s35390a.c
> +++ b/drivers/rtc/rtc-s35390a.c
> @@ -434,37 +434,32 @@ static int s35390a_probe(struct i2c_client *client,
>  	char buf, status1;
>  	struct device *dev = &client->dev;
>  
> -	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
> -		err = -ENODEV;
> -		goto exit;
> -	}
> +	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C))
> +		return -ENODEV;
>  
>  	s35390a = devm_kzalloc(dev, sizeof(struct s35390a), GFP_KERNEL);
> -	if (!s35390a) {
> -		err = -ENOMEM;
> -		goto exit;
> -	}
> +	if (!s35390a)
> +		return -ENOMEM;
>  
>  	s35390a->client[0] = client;
>  	i2c_set_clientdata(client, s35390a);
>  
>  	/* This chip uses multiple addresses, use dummy devices for them */
>  	for (i = 1; i < 8; ++i) {
> -		s35390a->client[i] = i2c_new_dummy_device(client->adapter,
> -					client->addr + i);
> +		s35390a->client[i] = devm_i2c_new_dummy_device(dev,
> +							       client->adapter,
> +							       client->addr + i);
>  		if (IS_ERR(s35390a->client[i])) {
>  			dev_err(dev, "Address %02x unavailable\n",
>  				client->addr + i);
> -			err = PTR_ERR(s35390a->client[i]);
> -			goto exit_dummy;
> +			return PTR_ERR(s35390a->client[i]);
>  		}
>  	}
>  
>  	err_read = s35390a_read_status(s35390a, &status1);
>  	if (err_read < 0) {
> -		err = err_read;
>  		dev_err(dev, "error resetting chip\n");
> -		goto exit_dummy;
> +		return err_read;
>  	}
>  
>  	if (status1 & S35390A_FLAG_24H)
> @@ -478,13 +473,13 @@ static int s35390a_probe(struct i2c_client *client,
>  		err = s35390a_set_reg(s35390a, S35390A_CMD_STATUS2, &buf, 1);
>  		if (err < 0) {
>  			dev_err(dev, "error disabling alarm");
> -			goto exit_dummy;
> +			return err;
>  		}
>  	} else {
>  		err = s35390a_disable_test_mode(s35390a);
>  		if (err < 0) {
>  			dev_err(dev, "error disabling test mode\n");
> -			goto exit_dummy;
> +			return err;
>  		}
>  	}
>  
> @@ -493,10 +488,8 @@ static int s35390a_probe(struct i2c_client *client,
>  	s35390a->rtc = devm_rtc_device_register(dev, s35390a_driver.driver.name,
>  						&s35390a_rtc_ops, THIS_MODULE);
>  
> -	if (IS_ERR(s35390a->rtc)) {
> -		err = PTR_ERR(s35390a->rtc);
> -		goto exit_dummy;
> -	}
> +	if (IS_ERR(s35390a->rtc))
> +		return PTR_ERR(s35390a->rtc);
>  
>  	/* supports per-minute alarms only, therefore set uie_unsupported */
>  	s35390a->rtc->uie_unsupported = 1;
> @@ -505,26 +498,6 @@ static int s35390a_probe(struct i2c_client *client,
>  		rtc_update_irq(s35390a->rtc, 1, RTC_AF);
>  
>  	return 0;
> -
> -exit_dummy:
> -	for (i = 1; i < 8; ++i)
> -		if (s35390a->client[i])
> -			i2c_unregister_device(s35390a->client[i]);
> -
> -exit:
> -	return err;
> -}
> -
> -static int s35390a_remove(struct i2c_client *client)
> -{
> -	unsigned int i;
> -	struct s35390a *s35390a = i2c_get_clientdata(client);
> -
> -	for (i = 1; i < 8; ++i)
> -		if (s35390a->client[i])
> -			i2c_unregister_device(s35390a->client[i]);
> -
> -	return 0;
>  }
>  
>  static struct i2c_driver s35390a_driver = {
> @@ -533,7 +506,6 @@ static struct i2c_driver s35390a_driver = {
>  		.of_match_table = of_match_ptr(s35390a_of_match),
>  	},
>  	.probe		= s35390a_probe,
> -	.remove		= s35390a_remove,
>  	.id_table	= s35390a_id,
>  };
>  
> -- 
> 2.20.1
> 

-- 
Alexandre Belloni, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com