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

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Message-ID: <d6fc95d0-4b8a-bc1f-e708-1ba5e591d35e@ti.com>
Date:   Fri, 1 Dec 2017 10:59:48 -0600
From:   Dan Murphy <dmurphy@...com>
To:     <rpurdie@...ys.net>, <jacek.anaszewski@...il.com>, <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

On 12/01/2017 10:56 AM, 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,
>  };
>  
>  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;

This is actually a bug in the driver.  I can submit this independently or keep this here

>  
>  	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);

Not sure if you want me to pull this out into a different patch or just add it to the
commit message

>  
> -	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);
>  	}
>  
>  	led->enable_gpio = devm_gpiod_get_optional(&client->dev,
> 


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