Re: [PATCH v4 1/5] spi: allow ancillary devices to share parent's chip selects

[Andy Shevchenko]

On Tue, Feb 24, 2026 at 11:12:57AM +0000, Miclaus, Antoniu wrote:
> > -----Original Message-----
> > From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxx>
> > Sent: Tuesday, February 24, 2026 12:09 PM
> > On Mon, Feb 23, 2026 at 06:21:00PM +0200, Antoniu Miclaus wrote:
> > > When registering an ancillary SPI device, the current code flags a chip
> > > select conflict with the parent device. This happens because the
> > > ancillary device intentionally uses one of the parent's chip selects,
> > > but __spi_add_device() checks against all existing devices including
> > > the parent.
> > >
> > > Allow this by passing the parent device pointer to __spi_add_device()
> > > and skipping the conflict check when the existing device is the parent.
> > 
> > Isn't this already applied?
> Don't think so.
> V2: https://patchwork.kernel.org/project/linux-iio/patch/bcb1eb34fc5e86fd5dbb4472ad1d3ea3cf3e9779.1770393792.git.antoniu.miclaus@xxxxxxxxxx/
> V3: https://patchwork.kernel.org/project/linux-iio/patch/20260213144742.16394-2-antoniu.miclaus@xxxxxxxxxx/

https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git/commit/?h=for-7.1&id=ffef4123043c5bb29e61052a41e577ae1ee6837a

Will be part of today's Linux Next IIUC.

-- 
With Best Regards,
Andy Shevchenko