[U-Boot] [PATCH 0/4] ARM: OMAP5/DRA7: Update ABB Configuration for all valid domains

[Nishanth Menon]

Original intent when Adaptive Body Bias(ABB) was supported in
bootloader was two fold:
a) ABB is mandatory for all OMAP5/DRA7 support
b) expectation was that linux kernel/Operating system will setup ABB
and voltage depending on the requirements of the platform.

However, over the last few years, few things changed:
i) DRA7 SoCs do not permit for voltage scaling beyond the bootloader's
initial settings thanks to a few silicon limitations. This implies
that the bootloader has to setup the correct voltage at boot for all
domains. Only the MPU voltage domain is excempt from this rule.
ii) software stack evolution tied up the voltage rails and ABB setup
together for obvious reasons of ABB is fundamentally related to
voltage rail configuration.

As a result of these, Linux and operating system just configures
just the frequency using the default boot loader configured voltage
can fail on many corner lot units and has been hard to debug. This
specifically is a concern with DRA7 generation of SoCs since other
than VDD_MPU, all other domains are only permitted to setup the
voltages to required OPP only at boot.

Given that OMAP5 closely matches DRA7, this series setsup ABB for all
domains consistent with the voltage configuration for all domains that
have need for ABB.

Series is based on v2016.05-rc2
Boot Log:
OMAP5uevm: http://pastebin.ubuntu.com/15971620/
AM572x-X15: http://pastebin.ubuntu.com/15971707/

Nishanth Menon (4):
  ARM: OMAP5/DRA7: Get rid of control_std_fuse_opp_vdd_mpu_2
  ARM: OMAP5/DRA7: Move ABB TXDONE mask to voltage structure
  ARM: OMAP5: Enable ABB configuration for MM voltage domain
  ARM: DRA7: Add ABB setup for all domains

 arch/arm/cpu/armv7/omap-common/clocks-common.c | 41 +++++++++++++++++++++++---
 arch/arm/cpu/armv7/omap5/hw_data.c             | 10 +++++++
 arch/arm/cpu/armv7/omap5/prcm-regs.c           | 16 ++++++++--
 arch/arm/include/asm/arch-omap5/omap.h         |  4 +++
 arch/arm/include/asm/omap_common.h             | 16 +++++++++-
 board/ti/am57xx/board.c                        |  4 +++
 6 files changed, 84 insertions(+), 7 deletions(-)

-- 
2.8.0