Re: [PATCH] arm64: dts: qcom: hamoa-iot-evk: enable pwm rgb leds

From: Tingguo Cheng

Date: Tue Oct 28 2025 - 00:49:29 EST


On 10/26/2025 11:15 AM, Bjorn Andersson wrote:
On Tue, Oct 21, 2025 at 02:29:22PM +0800, Tingguo Cheng wrote:
On 10/17/2025 4:09 PM, Konrad Dybcio wrote:
On 10/17/25 10:06 AM, Tingguo Cheng wrote:
Add red, green and blue LED channels for the RGB device connected to
PMC8380C PWM-LED pins.

Signed-off-by: Tingguo Cheng<tingguo.cheng@xxxxxxxxxxxxxxxx>
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Just to make sure, is this a "multicolor LED" consisting of 3 ones,
and *not* three LEDs that are supposed to communicate different
functions (i.e. network, power, disk i/o)?
Yes, it's a multicolor LED composed of three individual LEDs within a single
package—not three separate LEDs for different functions like network, power,
or disk I/O.
However, there's one exception worth mentioning:
The blue channel is connected to two sourcing signals—the EDL indicator and
the PMIC PWM-RGB blue LED—via two resistors. These resistors allow selection
between the two sources.
By default, the board is configured with the resistor soldered to connect
the blue LED to the EDL indicator.
To support software control, I’ve added the blue channel in the DTS,
enabling the capability to light the blue LED from the software side.
Some developers may choose to re-solder the resistor to connect the blue LED
to the PMIC PWM-RGB output instead, depending on their hardware setup.
Sounds like we have a RG LED, and if the user chooses to modify their
hardware, they have different hardware...which they can easily describe
by updating their DeviceTree.


It's a bit weird, but does it work to make this LED_COLOR_ID_MULTI with
just the RED and GREEN channels described?

Yes, I tired before with enabling RED and GREEN only, it works. (What you said makes sense)

Let me send V2 for *only enabling RED and GREEN*


Regards,
Bjorn

Konrad