linux-kernel - Re: [PATCH v3 2/2] leds: Add LED1202 I2C driverr

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Message-ID: <Zp4E76JNHTyx21wE@duo.ucw.cz>
Date: Mon, 22 Jul 2024 09:06:23 +0200
From: Pavel Machek <pavel@....cz>
To: Vicentiu Galanopulo <vicentiu.galanopulo@...ote-tech.co.uk>
Cc: lee@...nel.org, linux-kernel@...r.kernel.org,
	linux-leds@...r.kernel.org
Subject: Re: [PATCH v3 2/2] leds: Add LED1202 I2C driverr

Hi!

> The LED1202 is a 12-channel low quiescent current LED driver.
> The output current can be adjusted separately for each channel by
> 8-bit analog (current sink input) and 12-bit digital (PWM) dimming control.
> The LED1202 implements 12 low-side current generators with independent dimming control.
> Internal volatile memory allows the user to store up to 8 different patterns, each
> pattern is a particular output configuration in terms of PWM duty-cycle (on 4096 steps).
> Analog dimming (on 256 steps) is per channel but common to all patterns.


> +static ssize_t st1202_duration_pattern_show(struct device *dev,
> +					struct device_attribute *attr, char *buf)
> +{
> +	struct st1202_chip *chip;
> +	struct dev_ext_attribute *eattr;
> +	struct st1202_led_pattern_map *map;

New sysfs files need documentation.

Plus, this probably should use this interface, not custom one:

Documentation/ABI/testing/sysfs-class-led-trigger-pattern:What:         /sys/class/leds/<led>/hw_pattern

It might be better to submit driver without pattern support, then
re-add it when driver is merged.

Best regards,
							Pavel
-- 
People of Russia, stop Putin before his war on Ukraine escalates.

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