Hi Simon, Magnus,
The ROHM BD9571MWV PMIC on the Renesas Salvator-X(S) and ULCB
development boards supports DDR Backup Power, which means that the DDR
power rails can be kept powered while the main SoC is powered down.
For this to function correctly, the DDR Backup Power configuration
must be described in DT, which is the topic of this series:
- The first patch adds the missing device node for the BD9571 PMIC on
the ULCB boards,
- The last two patches add DDR Backup Mode configuration for
Salvator-X(S) and ULCB.
Changes compared to v3:
- Use a hex value for the bit mask.
Changes compared to v2:
- Add support for ULCB,
- Add "rohm,rstbmode-level" for Salvator-X(S).
The relevant DT binding updates have been accepted in
regulator/for-next, as well as driver support for DDR Backup Mode on
systems with momentary power switches ("rohm,rstbmode-pulse"), like
ULCB. Combined with this series, the PMIC on ULCB will be configured
automatically during system suspend.
Note that driver support for systems with toggle power swiches
("rohm,rstbmode-level"), like Salvator-X(S), is still under review
(https://lkml.org/lkml/2018/3/14/324). But as DT describes hardware,
not software limitations, this series is safe to apply.
This has been tested on M3ULCB (thanks Jacopo!), and on Salvator-X(S).
All support has been part of renesas-drivers since a few releases.
Thanks for applying!
Geert Uytterhoeven (3):
arm64: dts: renesas: ulcb: Add BD9571 PMIC
arm64: dts: renesas: salvator-common: Add PMIC DDR Backup Power config
arm64: dts: renesas: ulcb: Add PMIC DDR Backup Power config
arch/arm64/boot/dts/renesas/salvator-common.dtsi | 2 ++
arch/arm64/boot/dts/renesas/ulcb.dtsi | 31 ++++++++++++++++++++++++
2 files changed, 33 insertions(+)
--
2.7.4
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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