[v5,0/9] Add Tegra Quad SPI driver

This series adds Tegra210, Tegra186, and Tegra194 Quad SPI driver and
enables Quad SPI on Jetson Nano and Jetson Xavier NX.

QSPI controller is available on Tegra210, Tegra186 and Tegra194.

Tegra186 and Tegra194 has additional feature of combined sequence mode
where command, address and data can all be transferred in a single transfer.
Combined sequence mode is useful only when using DMA mode transfer.

This series does not have combined sequence mode feature as Tegra186/Tegra194
GPCDMA driver is not upstreamed yet.

This series includes
- dt-binding document
- QSPI driver for Tegra210/Tegra186/Tegra194
- Enables QSPI on Jetson Nano and Jetson Xavier NX.

Delta between patch versions:
[v5]:	Simplified implementation in Patch-0006

[v4]:	Updated dummy cycles implementation based on v3 feedback
	- Added dummy_data bit field int spi_transfer to indicate corresponding
	  transfer is dummy bytes transfer.
	- Updated Tegra QSPI transfer_one_message to identify dummy transfer and
	  to use HW supported dummy bytes transfer when dummy cycles are with in
	  Tegra QSPI supported max HW dummy cycles otherwise fallsback to transfer
	  dummy bytes from software.
	- Updated dt-bindings based on v3 feedback.

[v3]:	v2 has some mixed patches sent out accidentally.
	v3 sends proper patches with fixes mentioned in v2.

[v2]:	below v1 feedback
	- Added SPI_MASTER_USES_HW_DUMMY_CYCLES flag for controllers supporting
	  hardware dummy cycles and skips dummy bytes transfer from software for
	  these controllers.
	- Updated dt-binding doc with tx/rx tap delay properties.
	- Added qspi_out clock to dt-binding doc which will be used later with
	  ddr mode support.
	- All other v1 feedback on some cleanup.


Sowjanya Komatineni (9):
  dt-bindings: clock: tegra: Add clock ID TEGRA210_CLK_QSPI_PM
  dt-bindings: spi: Add Tegra Quad SPI device tree binding
  MAINTAINERS: Add Tegra Quad SPI driver section
  spi: tegra210-quad: Add support for Tegra210 QSPI controller
  spi: spi-mem: Mark dummy transfers by setting dummy_data bit
  spi: tegra210-quad: Add support for hardware dummy cycles transfer
  arm64: tegra: Enable QSPI on Jetson Nano
  arm64: tegra: Add QSPI nodes on Tegra194
  arm64: tegra: Enable QSPI on Jetson Xavier NX

 .../bindings/spi/nvidia,tegra210-quad.yaml         |  117 ++
 MAINTAINERS                                        |    8 +
 .../dts/nvidia/tegra194-p3509-0000+p3668-0000.dts  |   12 +
 arch/arm64/boot/dts/nvidia/tegra194.dtsi           |   28 +
 arch/arm64/boot/dts/nvidia/tegra210-p3450-0000.dts |   12 +
 arch/arm64/boot/dts/nvidia/tegra210.dtsi           |    5 +-
 drivers/spi/Kconfig                                |    9 +
 drivers/spi/Makefile                               |    1 +
 drivers/spi/spi-mem.c                              |    1 +
 drivers/spi/spi-tegra210-quad.c                    | 1410 ++++++++++++++++++++
 include/dt-bindings/clock/tegra210-car.h           |    2 +-
 include/linux/spi/spi.h                            |    2 +
 12 files changed, 1604 insertions(+), 3 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/spi/nvidia,tegra210-quad.yaml
 create mode 100644 drivers/spi/spi-tegra210-quad.c

On Mon, 21 Dec 2020 13:17:30 -0800, Sowjanya Komatineni wrote:
> This series adds Tegra210, Tegra186, and Tegra194 Quad SPI driver and

> enables Quad SPI on Jetson Nano and Jetson Xavier NX.

> 

> QSPI controller is available on Tegra210, Tegra186 and Tegra194.

> 

> Tegra186 and Tegra194 has additional feature of combined sequence mode

> where command, address and data can all be transferred in a single transfer.

> Combined sequence mode is useful only when using DMA mode transfer.

> 

> [...]


Applied to

   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next

Thanks!

[1/9] dt-bindings: clock: tegra: Add clock ID TEGRA210_CLK_QSPI_PM
      commit: b499779761278d6f5339daa230938211d98861ef
[2/9] dt-bindings: spi: Add Tegra Quad SPI device tree binding
      commit: 9684752e5fe3989b45f686a4e0202a683038be4a
[3/9] MAINTAINERS: Add Tegra Quad SPI driver section
      commit: e5c92bb924ce4bda9c4312b8596cf62ad7b07e2e
[4/9] spi: tegra210-quad: Add support for Tegra210 QSPI controller
      commit: 921fc1838fb036f690b8ba52e6a6d3644b475cbb
[5/9] spi: spi-mem: Mark dummy transfers by setting dummy_data bit
      commit: 98621ed011c57ba6e52e01a5982b221c9943b6d9
[6/9] spi: tegra210-quad: Add support for hardware dummy cycles transfer
      commit: 6a8a8b51703c69fa2d6adbbcbf731ce9b991c696

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