Re: [PATCH v8 2/2] docs: spi: add documentation for userspace device instantiation

Mark Brown <[email protected]> Fri, 31 Jul 2026 18:22:21 +0100

Newsgroups	org.kernel.vger.linux-doc,org.kernel.vger.linux-spi
Message-ID	<[email protected]>

On Tue, Jul 28, 2026 at 07:10:56PM +0000, Vishwaroop A wrote:
> Document the new_device and delete_device sysfs attributes on SPI
> controllers:

> +What:		/sys/class/spi_master/spiB/new_device
> +Date:		April 2026
> +KernelVersion:	7.2

These need updating.

> +On systems that need spidev access at boot, a systemd service or
> +udev rule can write to ``new_device`` after the SPI controller is
> +available.

The fixes for safe ordering of init mean that the new sysfs files will
appears slightly after the device is registering, we ought to do
something about ensuring there's a notification for the hotplug of the
properties.

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