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Subject: Re: [PATCH 12/24] leds: lm3692x: Use led_compose_name()
To:     Jacek Anaszewski <jacek.anaszewski@gmail.com>,
        <linux-leds@vger.kernel.org>
CC:     <devicetree@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
        <pavel@ucw.cz>, <robh@kernel.org>
References: <1541542052-10081-1-git-send-email-jacek.anaszewski@gmail.com>
 <1541542052-10081-13-git-send-email-jacek.anaszewski@gmail.com>
 <d1267477-e000-f392-290f-2546f8ee379c@ti.com>
 <a58cdce3-3d15-0ab4-de98-01e526a142a1@gmail.com>
From:   Dan Murphy <dmurphy@ti.com>
Message-ID: <8584e8a2-44df-33b1-4d9e-9fb3fb2cb98d@ti.com>
Date:   Thu, 8 Nov 2018 15:11:05 -0600
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Jacek

On 11/08/2018 02:48 PM, Jacek Anaszewski wrote:
> Dan,
> 
> On 11/08/2018 07:14 PM, Dan Murphy wrote:
>> On 11/06/2018 04:07 PM, Jacek Anaszewski wrote:
>>> Switch to using generic LED support for composing LED class
>>> device name.
>>>
>>> Signed-off-by: Jacek Anaszewski <jacek.anaszewski@gmail.com>
>>> Cc: Dan Murphy <dmurphy@ti.com>
>>> ---
>>>  drivers/leds/leds-lm3692x.c | 39 ++++++++++++++++++++-------------------
>>>  1 file changed, 20 insertions(+), 19 deletions(-)
>>>
>>> diff --git a/drivers/leds/leds-lm3692x.c b/drivers/leds/leds-lm3692x.c
>>> index 4f413a7..9dfc0f2 100644
>>> --- a/drivers/leds/leds-lm3692x.c
>>> +++ b/drivers/leds/leds-lm3692x.c
>>> @@ -13,7 +13,6 @@
>>>  #include <linux/regmap.h>
>>>  #include <linux/regulator/consumer.h>
>>>  #include <linux/slab.h>
>>> -#include <uapi/linux/uleds.h>
>>>  
>>>  #define LM36922_MODEL	0
>>>  #define LM36923_MODEL	1
>>> @@ -95,6 +94,9 @@
>>>  #define LM3692X_FAULT_FLAG_SHRT BIT(3)
>>>  #define LM3692X_FAULT_FLAG_OPEN BIT(4)
>>>  
>>> +#define LM36922_NAME "lm36922"
>>> +#define LM36923_NAME "lm36923"
>>> +
>>>  /**
>>>   * struct lm3692x_led -
>>>   * @lock - Lock for reading/writing the device
>>> @@ -103,7 +105,6 @@
>>>   * @regmap - Devices register map
>>>   * @enable_gpio - VDDIO/EN gpio to enable communication interface
>>>   * @regulator - LED supply regulator pointer
>>> - * @label - LED label
>>>   * @led_enable - LED sync to be enabled
>>>   * @model_id - Current device model ID enumerated
>>>   */
>>> @@ -114,7 +115,6 @@ struct lm3692x_led {
>>>  	struct regmap *regmap;
>>>  	struct gpio_desc *enable_gpio;
>>>  	struct regulator *regulator;
>>> -	char label[LED_MAX_NAME_SIZE];
>>>  	int led_enable;
>>>  	int model_id;
>>>  };
>>> @@ -325,7 +325,8 @@ static int lm3692x_init(struct lm3692x_led *led)
>>>  static int lm3692x_probe_dt(struct lm3692x_led *led)
>>>  {
>>>  	struct fwnode_handle *child = NULL;
>>> -	const char *name;
>>> +	struct led_init_data init_data;
>>> +	char *model_name;
>>>  	int ret;
>>>  
>>>  	led->enable_gpio = devm_gpiod_get_optional(&led->client->dev,
>>> @@ -346,17 +347,20 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
>>>  		dev_err(&led->client->dev, "No LED Child node\n");
>>>  		return -ENODEV;
>>>  	}
>>> +	init_data.fwnode = child;
>>>  
>>> -	fwnode_property_read_string(child, "linux,default-trigger",
>>> -				    &led->led_dev.default_trigger);
>>> +	if (led->model_id == LM36922_MODEL)
>>> +		model_name =  LM36922_NAME;
>>> +	else
>>> +		model_name =  LM36923_NAME;
>>>  
>>> -	ret = fwnode_property_read_string(child, "label", &name);
>>> +	ret = led_compose_name(child, model_name, ":backlight_cluster",
>>> +			       init_data.name);
>>>  	if (ret)
>>> -		snprintf(led->label, sizeof(led->label),
>>> -			"%s::", led->client->name);
>>> -	else
>>> -		snprintf(led->label, sizeof(led->label),
>>> -			 "%s:%s", led->client->name, name);
>>> +		return ret;
>>> +
>>> +	fwnode_property_read_string(child, "linux,default-trigger",
>>> +				    &led->led_dev.default_trigger);
>>>  
>>>  	ret = fwnode_property_read_u32(child, "reg", &led->led_enable);
>>>  	if (ret) {
>>> @@ -364,16 +368,13 @@ static int lm3692x_probe_dt(struct lm3692x_led *led)
>>>  		return ret;
>>>  	}
>>>  
>>> -	led->led_dev.name = led->label;
>>> -
>>> -	ret = devm_led_classdev_register(&led->client->dev, &led->led_dev);
>>> +	ret = devm_led_classdev_register_ext(&led->client->dev, &led->led_dev,
>>> +					     &init_data);
>>>  	if (ret) {
>>>  		dev_err(&led->client->dev, "led register err: %d\n", ret);
>>>  		return ret;
>>>  	}
>>>  
>>> -	led->led_dev.dev->of_node = to_of_node(child);
>>> -
>>>  	return 0;
>>>  }
>>>  
>>> @@ -439,8 +440,8 @@ static int lm3692x_remove(struct i2c_client *client)
>>>  }
>>>  
>>>  static const struct i2c_device_id lm3692x_id[] = {
>>> -	{ "lm36922", LM36922_MODEL },
>>> -	{ "lm36923", LM36923_MODEL },
>>> +	{ LM36922_NAME, LM36922_MODEL },
>>> +	{ LM36923_NAME, LM36923_MODEL },
>>
>> How is this change relevant?
>> No mention in the comments about this change.
> 
> Unrelated. It is a remnant from the stage of development, where I had
> an impression that i2c_client name is taken from this array
> somehow. Only later I learned that it is taken from OF compatible
> property after removing vendor prefix with comma.
> 
> Afterwards I decide to abide by this change since it seems to be
> just an improvement - if I'm adding the string definition anyway,
> then why not replace other matching literals?
> 
> I will add the explanation if the commit message if there are no
> other objections.

That works for me.  Just did not want the change to be "hidden" even without
the intent of hiding it.

Dan

> 
>>>  	{ }
>>>  };
>>>  MODULE_DEVICE_TABLE(i2c, lm3692x_id);
>>>
>>
>>
> 


-- 
------------------
Dan Murphy