linux-kernel - Re: [PATCH v6 5/6] leds: lp8860: Update the LED label generation

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Date:   Tue, 5 Dec 2017 20:56:30 +0100
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Dan Murphy <dmurphy@...com>, rpurdie@...ys.net, pavel@....cz
Cc:     linux-leds@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 5/6] leds: lp8860: Update the LED label generation

Dan,

On 12/04/2017 02:11 PM, Dan Murphy wrote:
> Jacek
> 
> On 12/03/2017 07:57 AM, Jacek Anaszewski wrote:
>> Dan,
>>
>> On 12/01/2017 05:56 PM, Dan Murphy wrote:
>>> Fix the LED label generation for the LP8860 to
>>> conform with the
>>>
>>> Documentation/devicetree/bindings/leds/common.txt
>>>
>>> document indicating the LED label should be part of a
>>> child node to the device parent.  If no label is
>>> in the child node then the LED label is created based
>>> on the parent node name and the alternate name passed in.
>>>
>>> Signed-off-by: Dan Murphy <dmurphy@...com>
>>> ---
>>>
>>> v6 - New patch to use the new LED class API
>>>
>>>  drivers/leds/leds-lp8860.c | 27 +++++++++++++++------------
>>>  1 file changed, 15 insertions(+), 12 deletions(-)
>>>
>>> diff --git a/drivers/leds/leds-lp8860.c b/drivers/leds/leds-lp8860.c
>>> index 3e70775a2d54..26bbfa144402 100644
>>> --- a/drivers/leds/leds-lp8860.c
>>> +++ b/drivers/leds/leds-lp8860.c
>>> @@ -22,6 +22,7 @@
>>>  #include <linux/of_gpio.h>
>>>  #include <linux/gpio/consumer.h>
>>>  #include <linux/slab.h>
>>> +#include <uapi/linux/uleds.h>
>>>  
>>>  #define LP8860_DISP_CL1_BRT_MSB		0x00
>>>  #define LP8860_DISP_CL1_BRT_LSB		0x01
>>> @@ -86,8 +87,6 @@
>>>  
>>>  #define LP8860_CLEAR_FAULTS		0x01
>>>  
>>> -#define LP8860_DISP_LED_NAME		"display_cluster"
>>> -
>>>  /**
>>>   * struct lp8860_led -
>>>   * @lock - Lock for reading/writing the device
>>> @@ -107,7 +106,7 @@ struct lp8860_led {
>>>  	struct regmap *eeprom_regmap;
>>>  	struct gpio_desc *enable_gpio;
>>>  	struct regulator *regulator;
>>> -	const char *label;
>>> +	char label[LED_MAX_NAME_SIZE];
>>>  };
>>>  
>>>  struct lp8860_eeprom_reg {
>>> @@ -318,7 +317,7 @@ static const struct regmap_config lp8860_regmap_config = {
>>>  	.max_register = LP8860_EEPROM_UNLOCK,
>>>  	.reg_defaults = lp8860_reg_defs,
>>>  	.num_reg_defaults = ARRAY_SIZE(lp8860_reg_defs),
>>> -	.cache_type = REGCACHE_NONE,
>>> +	.cache_type = REGCACHE_RBTREE,
>>
>> This seems to be an unrelated change.
>> Please split it to the separate patch and explain its merit.
> 
> ACK.  It will be a separate patch
> 
>>
>>>  };
>>>  
>>>  static const struct reg_default lp8860_eeprom_defs[] = {
>>> @@ -356,7 +355,7 @@ static const struct regmap_config lp8860_eeprom_regmap_config = {
>>>  	.max_register = LP8860_EEPROM_REG_24,
>>>  	.reg_defaults = lp8860_eeprom_defs,
>>>  	.num_reg_defaults = ARRAY_SIZE(lp8860_eeprom_defs),
>>> -	.cache_type = REGCACHE_NONE,
>>> +	.cache_type = REGCACHE_RBTREE,
>>>  };
>>>  
>>>  static int lp8860_probe(struct i2c_client *client,
>>> @@ -365,19 +364,23 @@ static int lp8860_probe(struct i2c_client *client,
>>>  	int ret;
>>>  	struct lp8860_led *led;
>>>  	struct device_node *np = client->dev.of_node;
>>> +	struct device_node *child_node;
>>> +
>>> +	if (!client->dev.of_node)
>>> +		return -ENODEV;
>>>  
>>>  	led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
>>>  	if (!led)
>>>  		return -ENOMEM;
>>>  
>>> -	led->label = LP8860_DISP_LED_NAME;
>>> +	for_each_available_child_of_node(np, child_node) {
>>> +		led->led_dev.default_trigger = of_get_property(child_node,
>>> +						    "linux,default-trigger",
>>> +						    NULL);
>>>  
>>> -	if (client->dev.of_node) {
>>> -		ret = of_property_read_string(np, "label", &led->label);
>>> -		if (ret) {
>>> -			dev_err(&client->dev, "Missing label in dt\n");
>>> -			return -EINVAL;
>>> -		}
>>> +		of_led_compose_name(np, child_node, "white:backlight",
>>> +				sizeof("white:backlight"),
>>> +				led->label);
>>
>> Let's skip it for now.
> 
> I will make the same change here as I do for the lm3692x driver.
> 
>>
>> Please also CC driver author always when you're modifying it.
> 
> The author was on the email.
> 
> It is me.  ;)
> 
> MODULE_AUTHOR("Dan Murphy <dmurphy@...com>");


OK, but the author of the driver touched by the patch 6/6
is different :-)

-- 
Best regards,
Jacek Anaszewski