| Message ID | 20240327-spi-omap2-mcspi-multi-mode-v3-0-c4ac329dd5a2@bootlin.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | Add multi mode support for omap-mcspi | expand |
On Wed, 27 Mar 2024 09:43:35 +0100, Louis Chauvet wrote: > This series adds the support for the omap-mcspi multi mode which allows > sending SPI messages with a shorter delay between CS and the message. > > One drawback of the multi-mode is that the CS is raised between each word, > so it can only be used with messages containing 1 word transfers and > asking for cs_change. Few devices, like FPGAs, may easily workaround this > limitation. > > [...] Applied to https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next Thanks! [1/3] spi: spi-omap2-mcspi.c: revert "Toggle CS after each word" commit: 67bb37c05a6b56e0e1f804706145a52f655af3f1 [2/3] spi: omap2-mcspi: Add support for MULTI-mode commit: d153ff4056cb346fd6182a8a1bea6e12b714b64f [3/3] spi: omap2-mcpsi: Enable MULTI-mode in more situations commit: e64d3b6fc9a388d7dc516668651cf4404bffec9b All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark
This series adds the support for the omap-mcspi multi mode which allows sending SPI messages with a shorter delay between CS and the message. One drawback of the multi-mode is that the CS is raised between each word, so it can only be used with messages containing 1 word transfers and asking for cs_change. Few devices, like FPGAs, may easily workaround this limitation. The first patch removes the current implementation, which is working, but don't comply with what is asked in the spi transfer (The CS is raised by the hardware regardless of cs_change state). No drivers or board file use this implementation upstream. The second patch adds the implementation of the multi-mode, which complies with what is asked in the SPI message. The third patch is the suggested optimization for using MULTI mode in more situations. Signed-off-by: Louis Chauvet <louis.chauvet@bootlin.com> --- Changes in v3: - Fix compilation warnings found with allmodconfig - Link to v2: https://lore.kernel.org/r/20240223-spi-omap2-mcspi-multi-mode-v2-0-afe94476b9c3@bootlin.com Changes in v2: - Updated the commit line for the first patch to use the correct format; - Updated the commit message for the second patch, adding precision on how the controler works; - Added the suggestion from Mark Brown to merge multiple transfers word into one when applicable; - Link to v1: https://lore.kernel.org/r/20240126-spi-omap2-mcspi-multi-mode-v1-0-d143d33f0fe0@bootlin.com --- Louis Chauvet (3): spi: spi-omap2-mcspi.c: revert "Toggle CS after each word" spi: omap2-mcspi: Add support for MULTI-mode spi: omap2-mcpsi: Enable MULTI-mode in more situations drivers/spi/spi-omap2-mcspi.c | 95 +++++++++++++++++++++------ include/linux/platform_data/spi-omap2-mcspi.h | 3 - 2 files changed, 74 insertions(+), 24 deletions(-) --- base-commit: 4cece764965020c22cff7665b18a012006359095 change-id: 20240126-spi-omap2-mcspi-multi-mode-e62f68b78ad3 Best regards,