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From: Marek Vasut <marex@nabladev.com>
To: Christoph Niedermaier <cniedermaier@dh-electronics.com>,
	Francesco Dolcini <francesco@dolcini.it>
Cc: "linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>,
	Rob Herring <robh@kernel.org>,
	Krzysztof Kozlowski <krzk+dt@kernel.org>,
	Conor Dooley <conor+dt@kernel.org>, Frank Li <Frank.Li@nxp.com>,
	Sascha Hauer <s.hauer@pengutronix.de>,
	Pengutronix Kernel Team <kernel@pengutronix.de>,
	Fabio Estevam <festevam@gmail.com>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"imx@lists.linux.dev" <imx@lists.linux.dev>,
	kernel <kernel@dh-electronics.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 1/2] ARM: dts: imx6ull-dhcor-maveo-box: Remove unused SPI device
Date: Thu, 22 Oct 2026 13:34:24 +0200	[thread overview]
Message-ID: <948d901e-ee1c-45f3-9946-30cea28a6128@nabladev.com> (raw)
In-Reply-To: <794745ff1c484257bef4f17917f3cf0e@dh-electronics.com>

On 10/22/26 12:58 PM, Christoph Niedermaier wrote:

Hello Christoph,

>>>>>>> --- a/arch/arm/boot/dts/nxp/imx/imx6ull-dhcor-maveo-box.dts
>>>>>>> +++ b/arch/arm/boot/dts/nxp/imx/imx6ull-dhcor-maveo-box.dts
>>>>>>> @@ -60,14 +60,6 @@ &ecspi4 {
>>>>>>>      pinctrl-0 = <&pinctrl_ecspi4>;
>>>>>>>      pinctrl-names = "default";
>>>>>>>      status = "okay";
>>>>>>
>>>>>> Drop "status = "okay"" too , since this controller will be unused ?
>>>>>
>>>>> you can instantiate a new device on the SPI bus from userspace. up to
>>>>> you, but if I was a user I would appreciate to have it enabled.
>>>> Good point -- Christoph, is this the (use)case here , can the user do that?
>>>
>>> I don't think that's the case, since there isn't currently an SPI device
>>> connected to this interface. Nevertheless, I'd be interested to know how
>>> to instantiate a new device from user space.
>>
>> Documentation/spi/instantiating-devices.rst
> 
> This is a relatively new document, I haven't seen it yet. Thank you very much.
> 
> I'm now leaning toward leaving the interface set to “okay” so that the existing
> SPI pins on X10 connector can easily accessed in the future.

If you connect anything more complex than a simple device, you would 
anyway need a DT overlay for this.

> @Marek: If you insist, I can also remove the status line.
Either way is fine by me, but consider the above.

      reply	other threads:[~2026-10-22 12:55 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-10-21 13:44 Christoph Niedermaier
2026-10-21 13:44 ` [PATCH 2/2] ARM: dts: imx6ull-dhcor-maveo-box: Correct PCB number Christoph Niedermaier
2026-10-21 17:20   ` Marek Vasut
2026-10-22  8:59     ` Christoph Niedermaier
2026-10-22 10:45       ` Marek Vasut
2026-10-21 17:19 ` [PATCH 1/2] ARM: dts: imx6ull-dhcor-maveo-box: Remove unused SPI device Marek Vasut
2026-10-21 18:37   ` Francesco Dolcini
2026-10-21 18:55     ` Marek Vasut
2026-10-22  9:12       ` Christoph Niedermaier
2026-10-22  9:25         ` Francesco Dolcini
2026-10-22 10:58           ` Christoph Niedermaier
2026-10-22 11:34             ` Marek Vasut [this message]

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