Re: [PATCH v8 04/11] arm64: dts: renesas: add support for solidrun rzg2l som and hb-iiot evb

[Josua Mayer]

Am 28.09.26 um 16:31 schrieb Geert Uytterhoeven:
> Hi Josua,
>
> On Mon, 28 Sept 2026 at 16:11, Josua Mayer <josua@xxxxxxxxxxxxx> wrote:
>> Am 23.09.26 um 16:37 schrieb Geert Uytterhoeven:
>>> On Fri, 4 Sept 2026 at 13:56, Josua Mayer <josua@xxxxxxxxxxxxx> wrote:
>>>> Add support for the SolidRun RZ/G2L SoM [1] on HummingBoard IIoT [2].
>>>>
>>>> The SoM features:
>>>> - 2x 1Gbps Ethernet with PHY
>>>> - eMMC
>>>> - 1/2GB DDR
>>>> - WiFi + Bluetooth
>>>> - SDHI Mux switching between eMMC and Carrier Board
>>>>
>>>> The HummingBoard IIoT features:
>>>> - 3x USB-2.0 Type A connector
>>>> - 2x 1Gbps RJ45 Ethernet
>>>> - USB Type-C Console Port
>>>> - microSD connector
>>>> - RTC with backup battery
>>>> - RGB Status LED
>>>> - 1x M.2 B-Key connector with USB-2.0 + SIM card holder
>>>> - 1x DSI Display Connector
>>>> - GPIO header
>>>> - 2x RS232/RS485 ports (configurable)
>>>> - 2x CAN
>>>>
>>>> Descriptions for eMMC, microSD and RS485 are provided as overlays due to
>>>> their dependency on configurable mux states.
>>>>
>>>> [1] https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/rz-g2l-som/
>>>> [2] https://www.solid-run.com/embedded-industrial-iot/renesas-rz-family/hummingboard-rz-series-sbcs/hummingboard-rz-g2l-iot-sbc/
>>>>
>>>> Signed-off-by: Josua Mayer <josua@xxxxxxxxxxxxx>
>>> Thanks for your patch!
>>>
>>>> --- /dev/null
>>>> +++ b/arch/arm64/boot/dts/renesas/rzg2l-hummingboard-iiot-common.dtsi
>>>> +       aliases {
>>>> +               gpio1 = &tca6408_u48;
>>>> +               gpio2 = &tca6408_u37;
>>>> +               gpio3 = &tca6416_u20;
>>>> +               gpio4 = &tca6416_u21;
>>> The TCA64xx driver does not seem to support gpio aliases,
>> I have confirmed this now. My expectation was that setting gpio aliases
>> helps make /dev/gpiochip numbering predictable, however this does
>> not currently work.
>>> so please
>>> drop these.
>> Is this a good reason to drop the aliases, or better to define them
>> regardless?
> Yes please.  Aliases are meant to identify labeled (numbered) connectors
> on a device, e.g. first serial port is serial0.
> A GPIO expander usually doesn't have such a connector, and the various
> GPIOs are typically routed to a variety of places.
Acknowledged, thanks for clarification!