linux-kernel - Re: [PATCH 08/10] arm64: dts: add description for solidrun imx8mp hummingboard-iiot

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Message-ID: <2c54b7b7-4eb4-44a0-8025-8da16a28efd4@solid-run.com>
Date: Tue, 28 Oct 2025 12:24:36 +0000
From: Josua Mayer <josua@...id-run.com>
To: Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>, Neil
 Armstrong <neil.armstrong@...aro.org>, Jessica Zhang
	<jessica.zhang@....qualcomm.com>, David Airlie <airlied@...il.com>, Simona
 Vetter <simona@...ll.ch>, Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>, Maxime Ripard <mripard@...nel.org>,
	Thomas Zimmermann <tzimmermann@...e.de>, Dmitry Torokhov
	<dmitry.torokhov@...il.com>, Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>, Fabio Estevam
	<festevam@...il.com>
CC: Jon Nettleton <jon@...id-run.com>, Mikhail Anikin
	<mikhail.anikin@...id-run.com>, Yazan Shhady <yazan.shhady@...id-run.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"imx@...ts.linux.dev" <imx@...ts.linux.dev>,
	"linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 08/10] arm64: dts: add description for solidrun imx8mp
 hummingboard-iiot

Am 27.10.25 um 18:48 schrieb Josua Mayer:

> Add description for the SolidRun i.MX8MP HummingBoard IIoT.
> The board is a new design around the i.MX8MP System on Module, not
> sharing much with previous HummingBoards.
>
> It comes with some common features:
> - 3x USB-3.0 Type A connector
> - 2x 1Gbps RJ45 Ethernet
> - USB Type-C Console Port
> - microSD connector
> - RTC with backup battery
> - RGB Status LED
> - 1x M.2 M-Key connector with PCI-E Gen. 3 x1
> - 1x M.2 B-Key connector with USB-2.0/3.0 + SIM card holder
> - 1x LVDS Display Connector
> - 1x DSI Display Connector
> - GPIO header
> - 2x RS232/RS485 ports (configurable)
> - 2x CAN
>
> In addition there is a board-to-board expansion connector to support
> custom daughter boards with access to SPI, a range of GPIOs and -
> notably - CAN and UART. Both 2x CAN and 2x UART can be muxed either
> to this b2b connector, or a termianl block connector on the base board.
>
> The routing choice for UART and CAN is expressed through gpio
> mux-controllers in DT and can be changed by applying dtb addons.
>
> Four dtb addons are provided:
>
> - dsi panel Winstar WJ70N3TYJHMNG0
> - lvds panel Winstar WF70A8SYJHLNGA
> - RS485 on UART port "A" (default rs232)
> - RS485 on UART port "B" (default rs232)
>
> Signed-off-by: Josua Mayer <josua@...id-run.com>
> ---
>  arch/arm64/boot/dts/freescale/Makefile             |   6 +
>  ...hummingboard-iiot-panel-dsi-WJ70N3TYJHMNG0.dtso |  70 ++
>  ...ummingboard-iiot-panel-lvds-WF70A8SYJHLNGA.dtso | 105 +++
>  .../imx8mp-hummingboard-iiot-rs485-a.dtso          |  18 +
>  .../imx8mp-hummingboard-iiot-rs485-b.dtso          |  18 +
>  .../dts/freescale/imx8mp-hummingboard-iiot.dts     | 710 +++++++++++++++++++++
>  6 files changed, 927 insertions(+)
cut
> diff --git a/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot.dts b/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot.dts
> new file mode 100644
> index 0000000000000..2e4cb676bc9da
> --- /dev/null
> +++ b/arch/arm64/boot/dts/freescale/imx8mp-hummingboard-iiot.dts
cut
> +	led-controller@30 {
> +		compatible = "ti,lp5562";
> +		reg = <0x30>;
> +		/* use internal clock, could use external generated by rtc */
> +		clock-mode = /bits/ 8 <1>;
> +		#address-cells = <1>;
> +		#size-cells = <0>;
> +
> +		multi-led@0 {
> +			reg = <0x0>;
> +			color = <LED_COLOR_ID_RGB>;
> +			#address-cells = <1>;
> +			#size-cells = <0>;
> +
> +			led@0 {
> +				reg = <0x0>;
> +				color = <LED_COLOR_ID_RED>;
> +				led-cur = /bits/ 8 <0x32>;
> +				max-cur = /bits/ 8 <0x64>;
> +			};
> +
> +			led@1 {
> +				reg = <0x1>;
> +				color = <LED_COLOR_ID_GREEN>;
> +				led-cur = /bits/ 8 <0x19>;
> +				max-cur = /bits/ 8 <0x32>;
> +			};
> +
> +			led@2 {
> +				reg = <0x2>;
> +				color = <LED_COLOR_ID_BLUE>;
> +				led-cur = /bits/ 8 <0x19>;
> +				max-cur = /bits/ 8 <0x32>;
> +			};
> +		};
> +
> +		led@3 {
> +			reg = <3>;
> +			chan-name = "D8";

chan-name gives the led the name D6 in sysfs.

The bindings do not allow however setting chan-name on
the multi-led, and it has an auto-generated name in sysfs.

Am I missing something? Can multi-leds have a custom name?

In v6.6 leds-lp5562 driver if I set in each multi-led led@[0-2] sub-node
chan-name to the same string "D7" - then the sysfs name becomes D7.

> +			color = <LED_COLOR_ID_GREEN>;
> +			led-cur = /bits/ 8 <0x19>;
> +			max-cur = /bits/ 8 <0x64>;
> +		};
> +	};