linux-kernel - Re: [PATCH v9 5/5] leds: Add a multicolor LED driver to group monochromatic LEDs

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Date:   Thu, 22 Jun 2023 19:49:12 +0200
From:   Jean-Jacques Hiblot <jjhiblot@...phandler.com>
To:     Lee Jones <lee@...nel.org>
CC:     <pavel@....cz>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <linux-leds@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v9 5/5] leds: Add a multicolor LED driver to group
 monochromatic LEDs



On 21/06/2023 21:33, Lee Jones wrote:
> On Fri, 16 Jun 2023, Jean-Jacques Hiblot wrote:
> 
>>   create mode 100644 drivers/leds/rgb/leds-group-multicolor.c
> 
> Sorry to do this too you, but there are too many nits that I can't pass by.
That's alright. I'll fix them in the next (hopefully last) round
> 
>> +		/* Restore sysfs access when the multicolor LED is released */
> 

> Out of interest, why are we doing this?
To prevent the user to play with the individual LEDs of the group, their 
sysfs interface is disabled (read-only). The interface must be 
re-enabled when the group is destroyed.
> 
>> +		devm_add_action_or_reset(dev, restore_sysfs_access, led_cdev);
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id of_led_group_multicolor_match[] = {
> 
> "leds"
> 
>> +	{ .compatible = "leds-group-multicolor" },
>> +	{}
>> +};
>> +MODULE_DEVICE_TABLE(of, of_led_group_multicolor_match);
>> +
>> +static struct platform_driver led_group_multicolor_driver = {
> 
> "leds"
> 
>> +	.probe		= led_mcg_probe,
>> +	.driver		= {
>> +		.name	= "leds_group_multicolor",
>> +		.of_match_table = of_led_group_multicolor_match,
>> +	}
>> +};
>> +module_platform_driver(led_group_multicolor_driver);
>> +
>> +MODULE_AUTHOR("Jean-Jacques Hiblot <jjhiblot@...phandler.com>");
>> +MODULE_DESCRIPTION("LEDs group multicolor driver");
>> +MODULE_LICENSE("GPL");
>> +MODULE_ALIAS("platform:leds-group-multicolor");
>> -- 
>> 2.34.1
>>
>