linux-kernel - Re: [PATCH v3 3/6] leds: lp8860: Update the dt parsing for LED labeling

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Date:   Tue, 12 Dec 2017 22:13:37 +0100
From:   Jacek Anaszewski <jacek.anaszewski@...il.com>
To:     Dan Murphy <dmurphy@...com>, robh+dt@...nel.org,
        mark.rutland@....com, rpurdie@...ys.net, pavel@....cz
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-leds@...r.kernel.org
Subject: Re: [PATCH v3 3/6] leds: lp8860: Update the dt parsing for LED
 labeling

Hi Dan,

Thanks for the patch set.

On 12/12/2017 07:58 PM, Dan Murphy wrote:
> Update the DT parsing for the label node so that
> the label is retrieved from the device child as
> opposed to being part of the parent.
> 
> This will align this driver with the LED
> binding documentation
> 
> Documentation/devicetree/bindings/leds/common.txt
> 
> Signed-off-by: Dan Murphy <dmurphy@...com>
> ---
> 
> v3 - Changed the label generation to pull the name from the i2c device id 
> as opposed to pulling the id from the parent dt node since that will just be 
> led-controller - https://patchwork.kernel.org/patch/10093753/
> 
> v2 - no changes
> 
>  drivers/leds/leds-lp8860.c | 23 ++++++++++++-----------
>  1 file changed, 12 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/leds/leds-lp8860.c b/drivers/leds/leds-lp8860.c
> index 3e70775a2d54..bc432764c99d 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 {
> @@ -365,19 +364,21 @@ 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;
> +	const char *name;
>  
>  	led = devm_kzalloc(&client->dev, sizeof(*led), GFP_KERNEL);
>  	if (!led)
>  		return -ENOMEM;
>  
> -	led->label = LP8860_DISP_LED_NAME;
> -
> -	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;
> -		}
> +	for_each_available_child_of_node(np, child_node) {
> +		ret = of_property_read_string(child_node, "label", &name);
> +		if (!ret)
> +		    snprintf(led->label, sizeof(led->label), "%s:%s",
> +					id->name, name);
> +		else
> +		    snprintf(led->label, sizeof(led->label),
> +			     "%s::display_cluster", id->name);

Here we have the same indentation problem as in case of leds-lm3692x.c

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

-- 
Best regards,
Jacek Anaszewski