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([2600:8803:e7e4:500:280e:69fd:7612:d5a9]) by smtp.gmail.com with ESMTPSA id 46e09a7af769-7ebcb2bae7fsm16738711a34.21.2026.07.14.07.44.19 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 14 Jul 2026 07:44:19 -0700 (PDT) Message-ID: Date: Tue, 14 Jul 2026 09:44:19 -0500 Precedence: bulk X-Mailing-List: linux-spi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 0/6] spi: add multi-CS and per-transfer lane mask support To: Andy Shevchenko Cc: Jonathan Santos , linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, nuno.sa@analog.com, michael.hennerich@analog.com, broonie@kernel.org, jonath4nns@gmail.com, marcelo.schmitt1@gmail.com, andy@kernel.org References: <6cf508ec-c139-4969-9342-d5b6717bde21@baylibre.com> Content-Language: en-US From: David Lechner In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit 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@JSANTO12-L01.ad.analog.com/T/#t >>>> [2]: https://lore.kernel.org/all/20250915183725.219473-1-jonas.gorski@gmail.com/ >>> >>> 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.