Re: [PATCH 1/1] arm64: dts: imx8mp-skov: add pinctrl-name 'reset' to fix CHECK_DTB warning

Peng Fan
2026-01-06T10:17:28Z

Hi Marco,

On Mon, Jan 05, 2026 at 12:14:48PM +0100, Marco Felsch wrote:
>Hi Frank,
>
>On 25-12-29, Frank Li wrote:
>> Add pinctrl-name 'reset' to fix below CHECK_DTB warnings:
>> arch/arm64/boot/dts/freescale/imx8mp-skov-basic.dtb: switch@5f (microchip,ksz9893): pinctrl-names: ['default'] is too short
>> from schema $id: http://devicetree.org/schemas/net/dsa/microchip,ksz.yaml#
>>
>> The commit (e469b87e0fb0d dt-bindings: net: dsa: microchip: Add strap
>> description to set SPI mode" force use two pinctrl-name 'default' and
>> 'reset'. switch@5f doesn't use SPI, so it is safe to use the same pinctrl
>> setting for both.
>
>please see:
>- https://lore.kernel.org/all/20251112084717.ea7fchu7jcz6dzsi@pengutronix.de/
>
>I stumbled over the same warning, but came to the conclusion, that the
>dt-bindings should be fixed instead of workaround broken bindings within
>the dtb.

If reset is optional, the dt-bindings should include "minItems:1" per my
understanding.

But..

>
>> - pinctrl-names = "default";
>> - pinctrl-0 = <&pinctrl_switch>;
>> + pinctrl-names = "default", "reset";
>> + pinctrl-0 = <&pinctrl_switch>, <&pinctrl_switch>;

Per checking
https://elixir.bootlin.com/linux/v6.18.3/source/drivers/net/dsa/microchip/ksz_common.c#L5372

seems "reset" is required in driver.

Regards
Peng

>> reset-gpios = <&gpio5 1 GPIO_ACTIVE_LOW>;
>> reg = <0x5f>;
>>
>> --
>> 2.34.1
>>
>>
>>
>
>--
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>
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