linux-kernel - Re: [PATCH 11/13] MIPS: Add Mobileye EyeQ6Lplus evaluation board dts

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Message-ID: <031b22d7-bb9f-4b70-a7b0-bc6697f84022@kernel.org>
Date: Fri, 19 Dec 2025 17:28:25 +0100
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Benoît Monin <benoit.monin@...tlin.com>,
 Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>,
 Gregory CLEMENT <gregory.clement@...tlin.com>,
 Théo Lebrun <theo.lebrun@...tlin.com>,
 Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>,
 Linus Walleij <linusw@...nel.org>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>,
 Tawfik Bayouk <tawfik.bayouk@...ileye.com>, linux-mips@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-clk@...r.kernel.org, linux-gpio@...r.kernel.org
Subject: Re: [PATCH 11/13] MIPS: Add Mobileye EyeQ6Lplus evaluation board dts

On 19/12/2025 16:57, Benoît Monin wrote:
> Hi Krzysztof,
> 
> On 12/18/25 16:30, Krzysztof Kozlowski wrote:
>> On 17/12/2025 14:36, Benoît Monin wrote:
>>> +
>>> +&spi0 {
>>> +	pinctrl-0 = <&spi0_pins>;
>>> +	pinctrl-names = "default";
>>> +	status = "okay";
>>> +	spidev@0 {
>>> +		compatible = "lwn,bk4-spi";
>>
>> NAK, you are not operating an excavator here.
>>
> Indeed, I do not (and I should have known better...).
> 
>> Don't invent hardware.
>>
> In my particular case of a microcontroller acting as an SPI "relay" on the
> evaluation board, what would be the best way to describe it? It connects
> the two SPI controllers of the SoC, one is a host and one is a target, so
> it behave as an SPI target on one side and as an SPI host on the other.
> 
> The trivial devices bindings seems to be dedicated to devices, thus not for
> SPI hosts. Do I need a dedicated binding or did I miss something I could
> use for a trivial spidev slave?

In DT you describe only a real device connected here, so in case of your
evalboard - nothing can be described, because there is no such real device.

Best regards,
Krzysztof