[U-Boot] [PATCH v4 0/15] Introduce driver model serial uclass

[Simon Glass]

This series adds support for a serial uclass, enabling serial drivers to be
converted to use driver model.

Unfortunately this is quite a complicated process for a number of reasons:

- serial is used before relocation, but driver model does not support this
- stdio member functions are not passed a device pointer, but driver model
    requires this (so does serial, but it uses an ugly work-around)
- driver model requires malloc() but this is not available before
  relocation
- for sandbox, if something goes wrong with the console, we still need to
  get an error message out through the fallback console

So this series relies on quite a few patches to address the above, as well
as the serial uclass and an implementation for sandbox.

If you have limited time, please take a look at least at the uclass patch
which is 'dm: Add a uclass for serial devices' (see include/serial.h).

With v4, exynos boards all build and a second attempt has been made to add
Tegra support via the ns16550 driver, tested on beaver.

To see the current state of driver model, look at u-boot-dm.git branch
'working'.

Changes in v4:
- Add a binding for sandbox serial
- Add a separate Tegra serial driver to deal with the clock issue
- Add new CONFIG_TEGRA_SERIAL option to enable dm driver
- Remove 'clock-frequency' property from serial nodes
- Remove clock frequency setup for ns16550 driver
- Remove pre-reloc fdt property
- Use hard-coded UART clock from Tegra configuration

Changes in v3:
- Add new change to enhance lists_bind_fdt()
- Add new patch for tegra serial port details
- Add new patch to collect common baud rate code in ns16550
- Add new patch to enable driver model for serial on tegra
- Add new patch to move baud rate calculation to ns16550.c
- Add new patch to support driver model in ns16550
- Add new patch to use V_NS16550_CLK only in SPL builds
- Automatically bind the console even if not marked for pre-relocation
- Avoid reordering functions
- Change pre-reloc fdt property to 'u-boot,dm-pre-reloc'
- Fix typo in commit message

Changes in v2:
- Add exynos serial support
- Remove RFC status
- Rename struct device to struct udevice
- Split out core driver model patches into a separate set

Simon Glass (15):
  serial: Set up the 'priv' pointer when creating a serial device
  dm: Adjust lists_bind_fdt() to return the bound device
  dm: Add a uclass for serial devices
  Set up stdio earlier when using driver model
  sandbox: Convert serial driver to use driver model
  sandbox: serial: Support a coloured console
  sandbox: dts: Add a serial console node
  dm: exynos: Mark exynos5 console as pre-reloc
  dm: exynos: Move serial to driver model
  dm: Make driver model available before board_init()
  dm: serial: Move baud rate calculation to ns16550.c
  dm: serial: Collect common baud rate code in ns16550
  dm: serial: Add driver model support for ns16550
  tegra: dts: Add serial port details
  dm: tegra: Enable driver model for serial

 arch/arm/dts/exynos5.dtsi                          |   1 +
 arch/arm/dts/tegra114-dalmore.dts                  |   1 +
 arch/arm/dts/tegra114.dtsi                         |  35 +++
 arch/arm/dts/tegra124-jetson-tk1.dts               |   1 +
 arch/arm/dts/tegra124-venice2.dts                  |   1 +
 arch/arm/dts/tegra124.dtsi                         |  35 +++
 arch/arm/dts/tegra20-colibri_t20_iris.dts          |   1 +
 arch/arm/dts/tegra20-harmony.dts                   |   1 +
 arch/arm/dts/tegra20-medcom-wide.dts               |   1 +
 arch/arm/dts/tegra20-paz00.dts                     |   1 +
 arch/arm/dts/tegra20-plutux.dts                    |   1 +
 arch/arm/dts/tegra20-seaboard.dts                  |   1 +
 arch/arm/dts/tegra20-tec.dts                       |   1 +
 arch/arm/dts/tegra20-trimslice.dts                 |   1 +
 arch/arm/dts/tegra20-ventana.dts                   |   1 +
 arch/arm/dts/tegra20-whistler.dts                  |   1 +
 arch/arm/dts/tegra20.dtsi                          |  10 +-
 arch/arm/dts/tegra30-beaver.dts                    |   1 +
 arch/arm/dts/tegra30-cardhu.dts                    |   1 +
 arch/arm/dts/tegra30-tamonten.dtsi                 |   1 +
 arch/arm/dts/tegra30.dtsi                          |  35 +++
 arch/sandbox/dts/sandbox.dts                       |  10 +
 common/board_r.c                                   |  19 +-
 common/stdio.c                                     |  18 +-
 doc/device-tree-bindings/serial/ns16550.txt        |  10 +
 doc/device-tree-bindings/serial/sandbox-serial.txt |  13 ++
 drivers/core/lists.c                               |  10 +-
 drivers/core/root.c                                |   2 +-
 drivers/serial/Makefile                            |   7 +-
 drivers/serial/ns16550.c                           | 203 ++++++++++++++--
 drivers/serial/sandbox.c                           | 140 ++++++++---
 drivers/serial/serial-uclass.c                     | 211 +++++++++++++++++
 drivers/serial/serial.c                            |   1 +
 drivers/serial/serial_ns16550.c                    |  23 +-
 drivers/serial/serial_s5p.c                        | 255 ++++++---------------
 drivers/serial/serial_tegra.c                      |  38 +++
 include/configs/exynos-common.h                    |   1 +
 include/configs/sandbox.h                          |   3 +
 include/configs/tegra-common.h                     |  10 +-
 include/dm/lists.h                                 |   6 +-
 include/dm/uclass-id.h                             |   1 +
 include/ns16550.h                                  |  64 ++++++
 include/serial.h                                   |  92 ++++++++
 include/stdio_dev.h                                |  24 +-
 44 files changed, 1021 insertions(+), 272 deletions(-)
 create mode 100644 doc/device-tree-bindings/serial/ns16550.txt
 create mode 100644 doc/device-tree-bindings/serial/sandbox-serial.txt
 create mode 100644 drivers/serial/serial-uclass.c
 create mode 100644 drivers/serial/serial_tegra.c

-- 
2.0.0.526.g5318336