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[0/7] arm64: exynos: Enable SPI for Exynos850

Message ID 20240120012948.8836-1-semen.protsenko@linaro.org (mailing list archive)
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Series arm64: exynos: Enable SPI for Exynos850 | expand

Message

Sam Protsenko Jan. 20, 2024, 1:29 a.m. UTC
This series enables SPI for Exynos850 SoC. The summary:

  1. Enable PDMA, it's needed for SPI (dts, clk)
  2. Propagate SPI src clock rate change up to DIV clocks, to make it
     possible to change SPI frequency (clk driver)
  3. Add Exynos850 support in SPI driver
  4. Add SPI nodes to Exynos850 SoC dtsi

All SPI instances were tested using `spidev_test' tool in all 3 possible
modes:

  - Polling mode: xfer_size <= 32
  - IRQ mode: 64 >= xfer_size >= 32
  - DMA mode: xfer_size > 64

with 200 kHz ... 49.9 MHz SPI frequencies. The next 3 approaches were
used:

  1. Software loopback ('-l' option for `spidev_test' tool)
  2. Hardware loopback (by connecting MISO line to MOSI)
  3. By communicating with ATMega found on Sensors Mezzanine board [1],
     programmed to act as an SPI slave device

and all the transactions were additionally checked on my Logic Analyzer
to make sure the SCK frequencies were actually correct.

[1] https://www.96boards.org/product/sensors-mezzanine/

Sam Protsenko (7):
  dt-bindings: clock: exynos850: Add PDMA clocks
  dt-bindings: spi: samsung: Add Exynos850 SPI
  clk: samsung: exynos850: Add PDMA clocks
  clk: samsung: exynos850: Propagate SPI IPCLK rate change
  spi: s3c64xx: Add Exynos850 support
  arm64: dts: exynos: Add PDMA node for Exynos850
  arm64: dts: exynos: Add SPI nodes for Exynos850

 .../devicetree/bindings/spi/samsung,spi.yaml  |  1 +
 arch/arm64/boot/dts/exynos/exynos850.dtsi     | 64 +++++++++++++++++++
 drivers/clk/samsung/clk-exynos850.c           | 42 +++++++-----
 drivers/spi/spi-s3c64xx.c                     | 14 ++++
 include/dt-bindings/clock/exynos850.h         |  2 +
 5 files changed, 106 insertions(+), 17 deletions(-)

Comments

Mark Brown Jan. 25, 2024, 2:02 p.m. UTC | #1
On Fri, 19 Jan 2024 19:29:41 -0600, Sam Protsenko wrote:
> This series enables SPI for Exynos850 SoC. The summary:
> 
>   1. Enable PDMA, it's needed for SPI (dts, clk)
>   2. Propagate SPI src clock rate change up to DIV clocks, to make it
>      possible to change SPI frequency (clk driver)
>   3. Add Exynos850 support in SPI driver
>   4. Add SPI nodes to Exynos850 SoC dtsi
> 
> [...]

Applied to

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

Thanks!

[2/7] dt-bindings: spi: samsung: Add Exynos850 SPI
      commit: 737cf74b38007fd5d5d2f15d4d4bc16e5f1cbfed
[5/7] spi: s3c64xx: Add Exynos850 support
      commit: 0229278bf33ea69cc1bba12c287f173e9b18c1f8

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