ARM: vexpress: Updates for v4.7

Hi ARM-SoC team,

This time addition of support for Cortex-M based MPS2 system is the main highlight. I could not split the patches into platform, driver and DT because it's newly added and have Kconfig/Makefile dependency.

Please pull !

--
Regards,
Sudeep

The following changes since commit f55532a0c0b8bb6148f4e07853b876ef73bc69ca:

Linux 4.6-rc1 (2016-03-26 16:03:24 -0700)

are available in the git repository at:

git://git.kernel.org/pub/scm/linux/kernel/git/sudeep.holla/linux.git
tags/vexpress-for-v4.7/updates

for you to fetch changes up to d6c4382919935e8354640d994d90f928096da96c:

ARM: dts: vexpress: Add external expansion bus to DT (2016-04-15
17:27:55 +0100)

----------------------------------------------------------------
ARMv7 Vexpress updates and fixes for v4.7

1. Basic support for ARM Versatile Express Cortex-M Prototyping System (V2M-MPS2). ucLinux can be now run on both the hardware and FVP models with Cortex-M3/M4/M7 configurations (Vladimir Murzin)

2. Support for external expansion bus useful for additional hardware e.g. LogicTile Express daughterboards (Brian Starkey)

3. Fix for device node name unit-address presence/absence warnings enabled in recently update DTC (Sudeep Holla)

----------------------------------------------------------------
Brian Starkey (1):
ARM: dts: vexpress: Add external expansion bus to DT

Sudeep Holla (1):
ARM: dts: vexpress: fix node name unit-address presence warnings

Vladimir Murzin (10):
dt-bindings: document the MPS2 timer bindings clockevents/drivers: add MPS2 Timer driver
dt-bindings: document the MPS2 UART bindings
serial: mps2-uart: add MPS2 UART driver
serial: mps2-uart: add support for early console
ARM: vexpress/mps2: introduce MPS2 platform
ARM: configs: add MPS2 defconfig
ARM: dts: introduce MPS2 AN385/AN386
ARM: dts: introduce MPS2 AN399/AN400
MAINTAINERS: Update ARM Versatile Express platform entry

  .../devicetree/bindings/serial/arm,mps2-uart.txt   |  19 +
  .../devicetree/bindings/timer/arm,mps2-timer.txt   |  28 +
  MAINTAINERS                                        |   1 +
  arch/arm/Kconfig                                   |  12 +
  arch/arm/Makefile                                  |   1 +
  arch/arm/boot/dts/Makefile                         |   3 +
  arch/arm/boot/dts/mps2-an385.dts                   |  92 +++
  arch/arm/boot/dts/mps2-an399.dts                   |  92 +++
  arch/arm/boot/dts/mps2.dtsi                        | 241 ++++++++
  arch/arm/boot/dts/vexpress-v2m-rs1.dtsi            |  44 +-
  arch/arm/boot/dts/vexpress-v2m.dtsi                |  44 +-
  arch/arm/boot/dts/vexpress-v2p-ca15-tc1.dts        |  47 +-
  arch/arm/boot/dts/vexpress-v2p-ca15_a7.dts         |  57 +-
  arch/arm/boot/dts/vexpress-v2p-ca5s.dts            |  37 +-
  arch/arm/boot/dts/vexpress-v2p-ca9.dts             |  41 +-
  arch/arm/configs/mps2_defconfig                    | 109 ++++
  arch/arm/mach-vexpress/Makefile                    |   4 +-
  arch/arm/mach-vexpress/Makefile.boot               |   3 +
  arch/arm/mach-vexpress/v2m-mps2.c                  |  21 +
  drivers/clocksource/Kconfig                        |   6 +
  drivers/clocksource/Makefile                       |   1 +
  drivers/clocksource/mps2-timer.c                   | 275 +++++++++
  drivers/tty/serial/Kconfig                         |  13 +
  drivers/tty/serial/Makefile                        |   1 +
  drivers/tty/serial/mps2-uart.c                     | 625 
+++++++++++++++++++++
  include/uapi/linux/serial_core.h                   |   3 +
  26 files changed, 1710 insertions(+), 110 deletions(-)

create mode 100644
Documentation/devicetree/bindings/serial/arm,mps2-uart.txt
create mode 100644
Documentation/devicetree/bindings/timer/arm,mps2-timer.txt
create mode 100644 arch/arm/boot/dts/mps2-an385.dts create mode 100644 arch/arm/boot/dts/mps2-an399.dts create mode 100644 arch/arm/boot/dts/mps2.dtsi create mode 100644 arch/arm/configs/mps2_defconfig create mode 100644 arch/arm/mach-vexpress/Makefile.boot create mode 100644 arch/arm/mach-vexpress/v2m-mps2.c create mode 100644 drivers/clocksource/mps2-timer.c create mode 100644 drivers/tty/serial/mps2-uart.c

I don't get it. Why is there a dependency between the three things?

Usually nothing breaks by adding any of those things, so the only dependency is that you need them all in order to make the platform work, but that is not enough reason to put them into a common branch.

Please respin this. When you do, it probably makes sense to separate the changes for vexpress from the new MPS2 platform into distinct branches.

I see you got the Acks from the clockevent and serial maintainers, but I don't see why they did not just merge those.

Arnd

Hi Arnd,

Sorry, I was just thinking from testing perspective earlier

OK, I will check again. I agree nothing should break.

OK

Regards,
Sudeep