[RFC 00/24] Allow Xen to boot with a raw Device Tree

[Julien Grall <julien.grall@linaro.org>]

Hi,

This is the first patch series to allow Xen to boot with a raw device tree, ie
without any specific modification for Xen.

Few months ago, the patch series "Support multiple ARM platform in XEN", has
added a tree structure to handle easier the device tree. Each node can carry
metadata to specify if the node can be pass-through to Dom0. Therefore, this
patch series take advantage of the "new" Device Tree API and get a rid of
the FDT API that is currently used to build Dom0 dts and in some drivers.

There is few items that was not added in this series:
    * Set the correct number of CPUs for Dom0 by editing CPUs node
    * Remove and create the GIC node
    * Remove and create the timer node

I hope to add support for previous items in the next patch series.

At the beginning of the mail, I a bit lied about Xen is able to raw DTS :).
The latter, still need to carry Xen and Linux command line until U-Boot/Grub
will support multiboot2 protocol.
I have noticed that U-boot has some fdt commands to change on the fly the device
tree. I think we can use this solution as a workaround for the beginning.
I will send an email later to explain the procedure.

Cheers.

Julien Grall (24):
  xen/char: dt-uart: Allow the user to give a path to the node
  xen: Introduce __initconst to store initial const data
  xen/dts: Don't check the number of address and size cells in
    process_cpu_node
  xen/dts: Constify device_tree_flattened
  xen/arm: Move __PSCI* from traps.c to the header
  xen: Add new string functions
  xen: Use the right string comparison function in device tree
  xen/dts: Don't add a fake property "name" in the device tree
  xen/dts: Add new helpers to use the device tree
  xen/dts: Remove device_get_reg call in process_memory_node
  xen/dts: Remove device_get_reg call in process_cpu_node
  xen/dts: Remove device_get_reg call in process_multiboot_node
  xen/dts: Check the CPU ID is not greater than NR_CPUS
  xen/video: hdlcd: Convert the driver to the new device tree API
  xen/arm: Use dt_device_match to avoid multiple if conditions
  xen/arm: Build DOM0 FDT by browsing the device tree structure
  xen/arm: Mark each device used by Xen as disabled in DOM0 FDT
  xen/arm: Don't map disabled device in DOM0
  xen/arm: Create a fake PSCI node in dom0 device tree
  xen/arm: Add new platform specific callback device_is_blacklist
  xen/arm: vexpress: Blacklist a list of board specific devices
  xen/arm: exynos5: Blacklist MCT device
  xen/dts: Clean up the exported API for device tree
  xen/arm: Check if the device is available before using it

 xen/arch/arm/device.c             |    3 +
 xen/arch/arm/domain_build.c       |  313 ++++++++++++++++++-------------------
 xen/arch/arm/platform.c           |   10 ++
 xen/arch/arm/platforms/exynos5.c  |   11 ++
 xen/arch/arm/platforms/vexpress.c |   17 ++
 xen/arch/arm/setup.c              |    6 +-
 xen/arch/arm/time.c               |   11 +-
 xen/arch/arm/traps.c              |    5 -
 xen/common/device_tree.c          |  273 ++++++++++++++++----------------
 xen/common/string.c               |   15 ++
 xen/drivers/char/dt-uart.c        |   16 +-
 xen/drivers/video/arm_hdlcd.c     |   58 ++++---
 xen/include/asm-arm/platform.h    |    7 +
 xen/include/asm-arm/psci.h        |    5 +
 xen/include/xen/device_tree.h     |  156 +++++++++++++++---
 xen/include/xen/init.h            |    1 +
 xen/include/xen/string.h          |   14 ++
 17 files changed, 565 insertions(+), 356 deletions(-)

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1.7.10.4