Re: [PATCH RFC] spi: virtio: Add [new,delete]_device sysfs interface

[Peng Fan <peng.fan@oss.nxp.com>]

On Fri, Dec 05, 2025 at 09:40:26PM +0800, Peng Fan (OSS) wrote:
>From: Peng Fan <peng.fan@nxp.com>
>
>spi-virtio registers a SPI controller, but we still need to register a
>SPI device to initiate the SPI virtio transfer.
>
>To Xen hypervisor, there might be no 'passthrough' node for DomU,
>so add a sysfs interface to allow creating/deleting a SPI device.
>
>Usage:
> echo "spidev" > /sys/class/spi_master/spi0/new_device
> echo "spi0.0" > /sys/class/spi_master/spi0/delete_device
>

After rethinking about this, I think it might be better to add the sysfs
to all SPI controller just as what i2c core supports:
drivers/i2c/i2c-core-base.c: 1264

I will post out v2 to move the code to spi_controller_groups if no objections.

Thanks,
Peng