linux-kernel - Re: [RFC PATCH v2 4/6] i2c: of: error message unification

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Date:   Wed, 15 Apr 2020 09:50:12 +0100
From:   Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
To:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        linux-i2c@...r.kernel.org
Cc:     linux-renesas-soc@...r.kernel.org, linux-i3c@...ts.infradead.org,
        Niklas Söderlund <niklas.soderlund@...natech.se>,
        Luca Ceresoli <luca@...aceresoli.net>,
        Jacopo Mondi <jacopo@...ndi.org>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Vladimir Zapolskiy <vz@...ia.com>,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: Re: [RFC PATCH v2 4/6] i2c: of: error message unification

Hi Wolfram,

On 15/04/2020 09:17, Kieran Bingham wrote:
> Hi Wolfram,
> 
> On 18/03/2020 15:00, Wolfram Sang wrote:
>> - don't prefix the device if %pOF is provided. That information is
>>   enough.
>> - move the prefix to pr_fmt
>> - change prefix from "of_i2c" to "i2c_of" because the code was moved
>>   out of the of-domain long ago
>> - drop error string for callers of of_i2c_register_device because it
>>   already reports enough (thanks to Tang Bin for the report!)
>>
>> Signed-off-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
>> Reviewed-by: Geert Uytterhoeven <geert+renesas@...der.be>
> 
> Reviewed-by: Kieran Bingham <kieran.bingham+renesas@...asonboard.com>
> 
>> ---
>>  drivers/i2c/i2c-core-of.c | 18 +++++++-----------
>>  1 file changed, 7 insertions(+), 11 deletions(-)
>>
>> diff --git a/drivers/i2c/i2c-core-of.c b/drivers/i2c/i2c-core-of.c
>> index 710704cd583e..f2d09ea0d336 100644
>> --- a/drivers/i2c/i2c-core-of.c
>> +++ b/drivers/i2c/i2c-core-of.c
>> @@ -8,6 +8,8 @@
>>   * Copyright (C) 2013, 2018 Wolfram Sang <wsa@...-dreams.de>
>>   */
>>  
>> +#define pr_fmt(fmt) "i2c_of: " fmt
>> +
>>  #include <dt-bindings/i2c/i2c.h>
>>  #include <linux/device.h>
>>  #include <linux/err.h>
>> @@ -28,7 +30,7 @@ int of_i2c_get_board_info(struct device_node *node, struct i2c_board_info *info)


Perhaps not directly needed by this patch but,

at some point will you rename of_i2c_* to i2c_of_* ?


>>  
>>  	ret = of_property_read_u32(node, "reg", &addr);
>>  	if (ret) {
>> -		pr_err("of_i2c: invalid reg on %pOF\n", node);
>> +		pr_err("invalid reg on %pOF\n", node);
>>  		return ret;
>>  	}
>>  
>> @@ -66,7 +68,7 @@ static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap,
>>  	struct i2c_board_info info;
>>  	int ret;
>>  
>> -	dev_dbg(&adap->dev, "of_i2c: register %pOF\n", node);
>> +	pr_debug("register %pOF\n", node);
>>  
>>  	ret = of_i2c_get_board_info(node, &info);
>>  	if (ret)
>> @@ -74,7 +76,7 @@ static struct i2c_client *of_i2c_register_device(struct i2c_adapter *adap,
>>  
>>  	client = i2c_new_client_device(adap, &info);
>>  	if (IS_ERR(client))
>> -		dev_err(&adap->dev, "of_i2c: Failure registering %pOF\n", node);
>> +		pr_err("failure registering %pOF (%ld)\n", node, PTR_ERR(client));
>>  
>>  	return client;
>>  }
>> @@ -88,7 +90,7 @@ void of_i2c_register_devices(struct i2c_adapter *adap)
>>  	if (!adap->dev.of_node)
>>  		return;
>>  
>> -	dev_dbg(&adap->dev, "of_i2c: walking child nodes\n");
>> +	dev_dbg(&adap->dev, "walking child nodes\n");
>>  
>>  	bus = of_get_child_by_name(adap->dev.of_node, "i2c-bus");
>>  	if (!bus)
>> @@ -99,12 +101,8 @@ void of_i2c_register_devices(struct i2c_adapter *adap)
>>  			continue;
>>  
>>  		client = of_i2c_register_device(adap, node);
>> -		if (IS_ERR(client)) {
>> -			dev_err(&adap->dev,
>> -				 "Failed to create I2C device for %pOF\n",
>> -				 node);
>> +		if (IS_ERR(client))
>>  			of_node_clear_flag(node, OF_POPULATED);
>> -		}
>>  	}
>>  
>>  	of_node_put(bus);
>> @@ -243,8 +241,6 @@ static int of_i2c_notify(struct notifier_block *nb, unsigned long action,
>>  
>>  		client = of_i2c_register_device(adap, rd->dn);
>>  		if (IS_ERR(client)) {
>> -			dev_err(&adap->dev, "failed to create client for '%pOF'\n",
>> -				 rd->dn);
>>  			put_device(&adap->dev);
>>  			of_node_clear_flag(rd->dn, OF_POPULATED);
>>  			return notifier_from_errno(PTR_ERR(client));
>>
>