[U-Boot] [RFT 0/8] exynos: Fix reboot on Odroid HC1
Krzysztof Kozlowski
krzk at kernel.org
Sat Feb 9 22:54:03 UTC 2019
Hi,
Odroid HC1 does not reboot properly (at least from SD card but
I do not expect difference on eMMC), if LDO4/VDD_ADC was turned
off by Linux kernel. This condition is so far always, because
Linux kernel did not enable ADC on ODroid HC1, therefore the
VDD_ADC regulator was turned off as unused.
The issue is in detection of revision which later is used to load
proper DTB.
The revision is obtained by ADC read of a voltage depending on VDD_ADC.
Therefore:
1. VDD_ADC has to be turned on (but board detection happens before
power is initialized),
2. Turning VDD_ADC should wait with ramp delay,
3. Reading the value from ADC should wait for it to stabilize.
I must admit I did not test it on other boards because latest U-Boot
does not boot from SD card.
Commends and testing are welcomed.
Best regards,
Krzysztof
Krzysztof Kozlowski (8):
exynos: Redo detection of revision when all resources are ready
exynos: Wait till ADC stabilizes before checking Odroid HC1 revision
adc: exynos-adc: Fix wrong bit operation used to stop the ADC
regulator: Add support for ramp delay
power: regulator: s2mps11: Fix step for LDO27 and LDO35
power: regulator: s2mps11: Add enable delay
arm: dts: exynos: Add supply for ADC block to Odroid XU3 family
arm: dts: exynos: Add ramp delay property to LDO regulators to Odroid
XU3 family
arch/arm/dts/exynos5422-odroidxu3.dts | 20 +++++++++
board/samsung/common/board.c | 19 ++++++++-
board/samsung/common/exynos5-dt-types.c | 34 +++++++++++++++-
drivers/adc/exynos-adc.c | 2 +-
drivers/power/regulator/regulator-uclass.c | 45 ++++++++++++++++++++-
drivers/power/regulator/s2mps11_regulator.c | 13 +++++-
include/power/regulator.h | 2 +
7 files changed, 129 insertions(+), 6 deletions(-)
--
2.17.1
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