linux-kernel - Re: [PATCH v3 2/3] leds: add support for TI LP5860 LED driver chip

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <875xd0jslv.fsf@pengutronix.de>
Date: Tue, 30 Sep 2025 09:40:28 +0200
From: Steffen Trumtrar <s.trumtrar@...gutronix.de>
To: Lee Jones <lee@...nel.org>
Cc: Pavel Machek <pavel@....cz>,  Rob Herring <robh@...nel.org>,  Krzysztof
 Kozlowski <krzk+dt@...nel.org>,  Conor Dooley <conor+dt@...nel.org>,
  Steffen Trumtrar <kernel@...gutronix.de>,  Pavel Machek
 <pavel@...nel.org>,  Mark Brown <broonie@...nel.org>,
  linux-leds@...r.kernel.org,  devicetree@...r.kernel.org,
  linux-spi@...r.kernel.org,  linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] leds: add support for TI LP5860 LED driver chip


Hi,

On 2025-09-16 at 16:34 +01, Lee Jones <lee@...nel.org> wrote:

> > +#include <linux/gpio.h>
> > +#include <linux/led-class-multicolor.h>
> > +#include <linux/module.h>
> > +#include <linux/of_gpio.h>
> > +#include <linux/of_platform.h>
> > +#include <linux/regmap.h>
> > +
> > +#include <linux/platform_data/leds-lp5860.h>
> > +
> > +static struct lp5860_led *mcled_cdev_to_led(struct led_classdev_mc *mc_cdev)
> > +{
> > +	return container_of(mc_cdev, struct lp5860_led, mc_cdev);
> > +}
> > +
> > +LP5860_SHOW_MODE(r_global_brightness_set, LP5860_REG_R_CURRENT_SET, LP5860_CC_GROUP_MASK, 0)
> > +LP5860_STORE_MODE(r_global_brightness_set, LP5860_REG_R_CURRENT_SET, LP5860_CC_GROUP_MASK, 0)
> > +DEVICE_ATTR_RW(r_global_brightness_set);
> 
> How is this different to /sys/class/leds/<led>/multi_intensity?
> 
> # echo 43 226 138 > /sys/class/leds/multicolor:status/multi_intensity
> red -
>     intensity = 138
>     max_brightness = 255
> green -
>     intensity = 43
>     max_brightness = 255
> blue -
>     intensity = 226
>     max_brightness = 255
>

the LP5860 has a register for setting the maximal brightness that holds for all LEDs in the matrix. multi_intensity and max_brightness is only for that one multicolor LED, right? And I can only manipulate the max_brightness of that one multicolor LED instance.
If I'm wrong, I'd be happy to not have to add the sysfs files.

> 
> (...)
> 

I addressed all the other comments for my v4.


Thanks,
Steffn

-- 
Pengutronix e.K.                | Dipl.-Inform. Steffen Trumtrar |
Steuerwalder Str. 21            | https://www.pengutronix.de/    |
31137 Hildesheim, Germany       | Phone: +49-5121-206917-0       |
Amtsgericht Hildesheim, HRA 2686| Fax:   +49-5121-206917-5555    |