From: "hamza.farooq@siemens.com" <hamza.farooq@siemens.com>
To: Pavel Machek <pavel@ucw.cz>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linux LED Subsystem <linux-leds@vger.kernel.org>,
Platform Driver <platform-driver-x86@vger.kernel.org>,
"henning.schild@siemens.com" <henning.schild@siemens.com>,
"jan.kiszka@siemens.com" <jan.kiszka@siemens.com>,
"Haeussler, Gerd" <gerd.haeussler.ext@siemens.com>
Subject: RE: Define LEDs with mixed colors
Date: Wed, 1 Sep 2021 11:24:13 +0000 [thread overview]
Message-ID: <DBAPR10MB42198EA968C14B13B510834D8ACD9@DBAPR10MB4219.EURPRD10.PROD.OUTLOOK.COM> (raw)
In-Reply-To: <20210901110929.GA18522@duo.ucw.cz>
> -----Original Message-----
> From: Pavel Machek <pavel@ucw.cz>
> Sent: Wednesday, September 1, 2021 1:09 PM
> To: Farooq, Muhammad Hamza (DI FA CTR IPC PRC2)
> <hamza.farooq@siemens.com>
> Cc: Andy Shevchenko <andy.shevchenko@gmail.com>; Linux Kernel Mailing
> List <linux-kernel@vger.kernel.org>; Linux LED Subsystem <linux-
> leds@vger.kernel.org>; Platform Driver <platform-driver-
> x86@vger.kernel.org>; Schild, Henning (T RDA IOT SES-DE)
> <henning.schild@siemens.com>; Kiszka, Jan (T RDA IOT)
> <jan.kiszka@siemens.com>; Haeussler, Gerd (ext) (DI FA CTR IPC PRC2)
> <gerd.haeussler.ext@siemens.com>
> Subject: Re: Define LEDs with mixed colors
>
> Hi!
>
> > I am toying with the idea of writing a multicolor LED GPIO driver. What
> would be the right way to define mixed color LEDs (for leds-gpio), in device
> tree or ACPI?
> > Consider the following:
> >
> > leds {
> > compatible = "gpio-leds";
> > led0 {
> > gpios = <&mcu_pio 0 GPIO_ACTIVE_LOW>;
> > color = <LED_COLOR_ID_RED>;
> > };
> >
> > led1 {
> > gpios = <&mcu_pio 1 GPIO_ACTIVE_HIGH>;
> > color = <LED_COLOR_ID_GREEN>;
> > };
> > led2 {
> > gpios = <&mcu_pio 0 GPIO_ACTIVE_LOW
> > &mcu_pio 1 GPIO_ACTIVE_LOW>;
> > color = <LED_COLOR_ID_AMBER>;
> > };
> > };
> >
> > This probably won't work as "gpios" seem to be single object in gpio-leds
> driver code, but what can I do to achieve something similar?
> > It is important to define this LED in DT/ACPI in order for the user app to see
> it in the /sys/class/led folder, without having to write platform-specific
> driver.
> >
>
> So you have one package with red and green LED, each connected to one
> GPIO?
Right. It is possible to create orange color, and I want to use DT/ACPI to present this info to the userland.
>
> Can you take a look at Documentation/leds/leds-class-multicolor.rst?
Couldn't find a hint there therefore this email thread. I might eventually write a multicolor led-gpio driver so want to know how to handle mixed LED.
>
> Best regards,
> Pavel
> --
> http://www.livejournal.com/~pavelmachek
next prev parent reply other threads:[~2021-09-01 11:24 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-01 8:39 Define LEDs with mixed colors hamza.farooq
2021-09-01 11:09 ` Pavel Machek
2021-09-01 11:24 ` hamza.farooq [this message]
2021-11-01 12:18 ` Pavel Machek
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=DBAPR10MB42198EA968C14B13B510834D8ACD9@DBAPR10MB4219.EURPRD10.PROD.OUTLOOK.COM \
--to=hamza.farooq@siemens.com \
--cc=andy.shevchenko@gmail.com \
--cc=gerd.haeussler.ext@siemens.com \
--cc=henning.schild@siemens.com \
--cc=jan.kiszka@siemens.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-leds@vger.kernel.org \
--cc=pavel@ucw.cz \
--cc=platform-driver-x86@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).