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Fri, 19 Dec 2025 13:33:31 -0800 (PST) From: David Lechner Date: Fri, 19 Dec 2025 15:32:12 -0600 Subject: [PATCH v4 4/9] spi: add multi_lane_mode field to struct spi_transfer Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20251219-spi-add-multi-bus-support-v4-4-145dc5204cd8@baylibre.com> References: <20251219-spi-add-multi-bus-support-v4-0-145dc5204cd8@baylibre.com> In-Reply-To: <20251219-spi-add-multi-bus-support-v4-0-145dc5204cd8@baylibre.com> To: Mark Brown , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Marcelo Schmitt , Michael Hennerich , =?utf-8?q?Nuno_S=C3=A1?= , Jonathan Cameron , Andy Shevchenko Cc: Sean Anderson , linux-spi@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org, David Lechner X-Mailer: b4 0.14.3 X-Developer-Signature: v=1; a=openpgp-sha256; l=2028; i=dlechner@baylibre.com; h=from:subject:message-id; bh=HF+bpVOoavKKEiID/RQ+Z83xMg2SKTxpfDjYlJ/W1Xc=; b=owEBbQGS/pANAwAKAcLMIAH/AY/AAcsmYgBpRcR+63tdWe3Dq3SfvXY3D0UkrPjsmJVZFWlyp BqDw/0tCMmJATMEAAEKAB0WIQTsGNmeYg6D1pzYaJjCzCAB/wGPwAUCaUXEfgAKCRDCzCAB/wGP wOGIB/9gDadU5FGpX/q+RfD4+syl1wJV6/ulWqJD9resnhlPcBddMNNewxrCTlQzqHoDNEykqXP UUmVd5SACUC3AZSssyZBsslhEQocLCVAa3iva4W3O2+/h1GT4ya9ybBeBIc7w8LDWNDD/zmRrbZ s/lWNOWZzX9JGe4N5XjlJrKkB0HeNOix8mXpwsV/CpU8dsu/P6+swv1W00XnXbO+jiefVDge8cw fbpCdq5O3mqVDt9g1PJtEybbNEwtYCHG+39/nwgeLReOx0c0viMXFax17jLzpvGsudDcrFzG22g 8jIJFdxSFmnsx2yObmQfVg/DjuB43howiLEr3a5CzYwxfuPG X-Developer-Key: i=dlechner@baylibre.com; a=openpgp; fpr=8A73D82A6A1F509907F373881F8AF88C82F77C03 Add a new multi_lane_mode field to struct spi_transfer to allow peripherals that support multiple SPI lanes to be used with a single SPI controller. This requires both the peripheral and the controller to have multiple serializers connected to separate data lanes. It could also be used with a single controller and multiple peripherals that are functioning as a single logical device (similar to parallel memories). Acked-by: Nuno S=C3=A1 Acked-by: Marcelo Schmitt Signed-off-by: David Lechner --- v4 changes: * Shortened commit message (useful info will be in docs instead). * Added whitespace to create clear grouping of macros and the field. v3 changes: * Renamed "buses" to "lanes" to reflect devicetree property name change. --- include/linux/spi/spi.h | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h index 7aff60ab257e..eba7ae8466ac 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -981,6 +981,8 @@ struct spi_res { * (SPI_NBITS_SINGLE) is used. * @rx_nbits: number of bits used for reading. If 0 the default * (SPI_NBITS_SINGLE) is used. + * @multi_lane_mode: How to serialize data on multiple lanes. One of the + * SPI_MULTI_LANE_MODE_* values. * @len: size of rx and tx buffers (in bytes) * @speed_hz: Select a speed other than the device default for this * transfer. If 0 the default (from @spi_device) is used. @@ -1117,6 +1119,12 @@ struct spi_transfer { unsigned cs_change:1; unsigned tx_nbits:4; unsigned rx_nbits:4; + +#define SPI_MULTI_LANE_MODE_SINGLE 0 /* only use single lane */ +#define SPI_MULTI_LANE_MODE_STRIPE 1 /* one data word per lane */ +#define SPI_MULTI_LANE_MODE_MIRROR 2 /* same word sent on all lanes */ + unsigned multi_lane_mode: 2; + unsigned timestamped:1; bool dtr_mode; #define SPI_NBITS_SINGLE 0x01 /* 1-bit transfer */ --=20 2.43.0