[PATCH v13 0/6] Add Rockchip SFC(serial flash controller) support

[Jon Lin]

Changes in v13:
- Provide independent interfaces to obtain RX TX FIFO status respectively
- Add more debug information
- Depress DMA limitation

Changes in v12:
- Remove useless oneOf lable
- Add sfc controller discription
- Remove the limitation of SFC_MIN_SPEED_HZ
- Add IRQ_NONE method for irq handler
- Add SPI_MASTER_HALF_DUPLEX flags
- Add sfc interrupt mask bits and status register initial progress

Changes in v11:
- The tx is set to 1 for Odroid Go Advance device

Changes in v10:
- Fix dma transfer logic

Changes in v9:
- Separate DMA IRQ setting and wait_completion from DMA fifo transfer
  function to make dma_status_poll be possible(Which I will implement
  in u-boot)
- Add SFC Kconfig detail comment

Changes in v8:
- Fix indent 4 to 2 in yaml

Changes in v7:
- Fix up the sclk_sfc parent error in rk3036
- Unify to "rockchip,sfc" compatible id because all the feature update
  will have a new IP version, so the driver is used for the SFC IP in
  all SoCs
- Change to use node "sfc" to name the SFC pinctrl group
- Add subnode reg property check
- Add rockchip_sfc_adjust_op_size to workaround in CMD + DUMMY case
- Limit max_iosize to 32KB

Changes in v6:
- Add support in device trees for rv1126(Declared in series 5 but not
  submitted)
- Change to use "clk_sfc" "hclk_sfc" as clock lable, since it does not
  affect interpretation and has been widely used
- Support sfc tx_dual, tx_quad(Declared in series 5 but not submitted)
- Simplify the code, such as remove "rockchip_sfc_register_all"(Declared
  in series 5 but not submitted)
- Support SFC ver4 ver5(Declared in series 5 but not submitted)
- Add author Chris Morgan and Jon Lin to spi-rockchip-sfc.c
- Change to use devm_spi_alloc_master and spi_unregister_master

Changes in v5:
- Add support in device trees for rv1126
- Support sfc tx_dual, tx_quad
- Simplify the code, such as remove "rockchip_sfc_register_all"
- Support SFC ver4 ver5

Changes in v4:
- Changing patch back to an "RFC". An engineer from Rockchip
  reached out to me to let me know they are working on this patch for
  upstream, I am submitting this v4 for the community to see however
  I expect Jon Lin (jon.lin at rock-chips.com) will submit new patches
  soon and these are the ones we should pursue for mainlining. Jon's
  patch series should include support for more hardware than this
  series.
- Clean up documentation more and ensure it is correct per
  make dt_binding_check.
- Add support in device trees for rk3036, rk3308, and rv1108.
- Add ahb clock (hclk_sfc) support for rk3036.
- Change rockchip_sfc_wait_fifo_ready() to use a switch statement.
- Change IRQ code to only mark IRQ as handled if it handles the
  specific IRQ (DMA transfer finish) it is supposed to handle.

Changes in v3:
- Changed the name of the clocks to sfc/ahb (from clk-sfc/clk-hsfc).
- Changed the compatible string from rockchip,sfc to
  rockchip,rk3036-sfc. A quick glance at the datasheets suggests this
  driver should work for the PX30, RK180x, RK3036, RK312x, RK3308 and
  RV1108 SoCs, and possibly more. However, I am currently only able
  to test this on a PX30 (an RK3326). The technical reference manuals
  appear to list the same registers for each device.
- Corrected devicetree documentation for formatting and to note these
  changes.
- Replaced the maintainer with Heiko Stuebner and myself, as we will
  take ownership of this going forward.
- Noted that the device (per the reference manual) supports 4 CS, but
  I am only able to test a single CS (CS 0).
- Reordered patches to comply with upstream rules.

Changes in v2:
- Reimplemented driver using spi-mem subsystem.
- Removed power management code as I couldn't get it working properly.
- Added device tree bindings for Odroid Go Advance.

Changes in v1:
hanges made in this new series versus the v8 of the old series:
- Added function to read spi-rx-bus-width from device tree, in the
  event that the SPI chip supports 4x mode but only has 2 pins
  wired (such as the Odroid Go Advance).
- Changed device tree documentation from txt to yaml format.
- Made "reset" message a dev_dbg from a dev_info.
- Changed read and write fifo functions to remove redundant checks.
- Changed the write and read from relaxed to non-relaxed when
  starting the DMA transfer or reading the DMA IRQ.
- Changed from dma_coerce_mask_and_coherent to just
  dma_set_mask_and_coherent.
- Changed name of get_if_type to rockchip_sfc_get_if_type.

Chris Morgan (6):
  dt-bindings: rockchip-sfc: Bindings for Rockchip serial flash
    controller
  spi: rockchip-sfc: add rockchip serial flash controller
  arm64: dts: rockchip: Add SFC to PX30
  arm: dts: rockchip: Add SFC to RV1108
  arm64: dts: rockchip: Add SFC to RK3308
  arm64: dts: rockchip: Enable SFC for Odroid Go Advance

 .../devicetree/bindings/spi/rockchip-sfc.yaml |  91 +++
 arch/arm/boot/dts/rv1108.dtsi                 |  37 +
 arch/arm64/boot/dts/rockchip/px30.dtsi        |  38 +
 arch/arm64/boot/dts/rockchip/rk3308.dtsi      |  37 +
 .../boot/dts/rockchip/rk3326-odroid-go2.dts   |  16 +
 drivers/spi/Kconfig                           |  12 +
 drivers/spi/Makefile                          |   1 +
 drivers/spi/spi-rockchip-sfc.c                | 694 ++++++++++++++++++
 8 files changed, 926 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/spi/rockchip-sfc.yaml
 create mode 100644 drivers/spi/spi-rockchip-sfc.c

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2.17.1