[U-Boot] [PATCH v3 0/8] arm: socfpga: implement proper peripheral reset handling

[Simon Goldschmidt]

This series implements peripheral reset handling for socfpga gen5.

It moves from enabling all peripherals during SPL startup to using the
socfpga reset driver from all peripherals and enabling peripherals when
they are used.

As Linux cannot even handle this in 4.20, the reset driver implements a
compatibility mode where it takes all peripherals out of reset before
jumpint to the OS if an environment variable "socfpga_permodrst_ungate=1"
is found. This is enabled by default for socfpga gen5 boards, but should
be moved to default off in the near future once a Linux kernel supports
reset handling for all drivers.

Changes in v3:
- centralize u-boot,dem-pre-reloc for soc, rst and sdr into one common file
- rename env var to socfpga_legacy_reset_compat
- add env var to CONFIG_EXTRA_ENV_SETTINGS without further ifdefs
- changed the order of patches to keep things bisectable
- fix falcon mode in SPL should work, too
- change env var name "socfpga_permodrst_ungate" to
  "socfpga_legacy_reset_compat"
- in compat mode, don't reset peripherals once they are enabled
- add DM_FLAG_OS_PREPARE flag
- add DM_FLAG_OS_PREPARE flag
- keep the call to enable fpga bridges in SPL

Changes in v2:
- cleanly merged Linux dts (moved change of SDR controller base address
  to a separate patch)
- this patch is new in v2
- moved from Kernel option "OLD_SOCFPGA_KERNEL_COMPAT" to environment
  variable "socfpga_permodrst_ungate"
- port DDR driver to DM UCLASS_RAM
- don't change DDR calibration training driver (code got too big)
- use reset.h code instead of socfpga_per_reset()
- fix copy/paste issues
- add .remove callback to release the resets
- add .remove callback to release the resets
- removed Kconfig option OLD_SOCFPGA_KERNEL_COMPAT since compatibility
  now uses an environment variable

Simon Goldschmidt (8):
  arm: socfpga: gen5: sync devicetrees to Linux
  arm: socfpga: gen5: add reset & sdr node to SPL devicetrees
  arm: socfpga: gen5: deassert peripheral reset by default
  reset: socfpga: add reset handling for old kernels
  arm: socfpga: move gen5 SDR driver to DM
  mtd: rawnand: denali: add reset handling
  spi: cadence_qspi: add reset handling
  arm: socfpga: implement proper peripheral reset

 arch/arm/Kconfig                              |   2 +
 arch/arm/dts/socfpga-common-u-boot.dtsi       |  19 +++
 arch/arm/dts/socfpga.dtsi                     |  23 ++-
 arch/arm/dts/socfpga_arria5_socdk-u-boot.dtsi |   6 +-
 arch/arm/dts/socfpga_cyclone5_dbm_soc1.dts    |   5 +-
 .../socfpga_cyclone5_de0_nano_soc-u-boot.dtsi |   6 +-
 arch/arm/dts/socfpga_cyclone5_de10_nano.dts   |   5 +-
 arch/arm/dts/socfpga_cyclone5_de1_soc.dts     |   5 +-
 arch/arm/dts/socfpga_cyclone5_is1.dts         |   5 +-
 .../dts/socfpga_cyclone5_socdk-u-boot.dtsi    |   6 +-
 .../dts/socfpga_cyclone5_sockit-u-boot.dtsi   |   6 +-
 .../dts/socfpga_cyclone5_socrates-u-boot.dtsi |   6 +-
 arch/arm/dts/socfpga_cyclone5_socrates.dts    |   2 -
 arch/arm/dts/socfpga_cyclone5_sr1500.dts      |   5 +-
 .../socfpga_cyclone5_vining_fpga-u-boot.dtsi  |   6 +-
 .../mach-socfpga/include/mach/sdram_gen5.h    |   4 -
 arch/arm/mach-socfpga/misc_gen5.c             |  10 --
 arch/arm/mach-socfpga/spl_gen5.c              |  38 ++---
 drivers/ddr/altera/Kconfig                    |   1 +
 drivers/ddr/altera/sdram_gen5.c               | 143 ++++++++++++++++--
 drivers/ddr/altera/sequencer.c                |   9 +-
 drivers/ddr/altera/sequencer.h                |  35 +++++
 drivers/mtd/nand/raw/denali.h                 |   2 +
 drivers/mtd/nand/raw/denali_dt.c              |  15 ++
 drivers/reset/reset-socfpga.c                 |  44 ++++++
 drivers/spi/cadence_qspi.c                    |  17 +++
 drivers/spi/cadence_qspi.h                    |   4 +
 include/configs/socfpga_common.h              |   1 +
 28 files changed, 322 insertions(+), 108 deletions(-)
 create mode 100644 arch/arm/dts/socfpga-common-u-boot.dtsi

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2.17.1