Re: [PATCH 0/6] spi: add multi-CS and per-transfer lane mask support

[David Lechner]

On 7/14/26 9:26 AM, Andy Shevchenko wrote:
> On Tue, Jul 14, 2026 at 09:09:02AM -0500, David Lechner wrote:
>> On 7/14/26 3:57 AM, Andy Shevchenko wrote:
>>> On Tue, Jul 14, 2026 at 02:55:31AM -0300, Jonathan Santos wrote:
>>>> This series introduces two SPI subsystem features: per-transfer chipselect
>>>> masks and multi-CS device support. Together they address the multi-device
>>>> setup described in [1] and the limitation noted in [2], where no SPI
>>>> controller completely handles logical chip selects beyond the first one.
>>>>
>>>> The first part of the set addresses multi-CS support. Some SPI controllers
>>>> can assert multiple chip selects simultaneously, but the existing code
>>>> hardcoded CS index 0 in both spi_set_cs() and of_spi_parse_dt(),
>>>> preventing this from working.
>>>>
>>>> The second part addresses dynamic lane selection for STRIPE mode. In
>>>> SPI_MULTI_LANE_MODE_STRIPE, all available lanes are currently always
>>>> active. Some peripherals need to select a different subset of rx/tx lanes
>>>> per transfer. New fields are added to the spi_transfer struct to allow
>>>> drivers to specify which lanes to use for each transfer. The documentation
>>>> is also updated to describe this new behavior.
>>>
>>>> [1]: https://lore.kernel.org/linux-iio/af0EGv172ZMl%2F6N5@xxxxxxxxxxxxxxxxxxxxxxxxxx/T/#t
>>>> [2]: https://lore.kernel.org/all/20250915183725.219473-1-jonas.gorski@xxxxxxxxx/
>>>
>>> Mark usually "merges" a series like this and cover letter goes as merge commit
>>> message. With that in mind, can we use Link tags for the above? Like
>>>
>>> Link: ... [1]
>>> Link: ... [2]
> 
>> Beware, that would cause b4 to add the links to every patch in the series.
> 
> Even in `b4 shazam` case? I thought it adds only a single Link per patch,
> and leaves the original Links as is. No?

Last I checked (which was a while ago), all tags in the cover letter get
applied to all patches in the series.

> 
> Also this can be done with the blank line before real tags, would it make
> it behave differently?
> 

Don't know.