Hi all,
This patch series contains prototype code to enable DT support for PM domains
on Renesas R-Mobile SoCs.
Currently it's limited to R-Mobile A1 (r8a7740), but given the similarity of
the SYSC System-Controller on the various SH-Mobile/R-Mobile SoCs, and the
abstraction of PM domains in DT, it should be sufficiently generic to handle
other SoCs in the future (e.g. SH-Mobile AP4 (sh7372), SH-Mobile AG5 (sh73a0),
R-Mobile APE6 (r8a73a4)).
Despite my request to add support for non-contiguous arrays for onecell PM
domain providers, I went for representing the SoC's power area hierarchy as a
hierarchy in DT, with multiple PM domain nodes, and using "#power-domain-cells
= <0>" (see also the P.S. below). The code to support a proper hiearchy turned
out to be surprisingly clean and simple(r).
Dependencies:
- "[PATCH 00/11] ARM: shmobile: r8a7740/armadillo legacy prototype pm domain
support", sent by me (www.spinics.net/lists/arm-kernel/msg358037.html),
- "[PATCH v3 0/9] PM / Domains: Generic OF-based support", sent by Ulf
Hansson (www.spinics.net/lists/arm-kernel/msg357003.html),
- "[PATCH 00/15] PM / Domains: Cleanups and remove superfluous APIs", sent by
Ulf Hansson (www.spinics.net/lists/linux-samsung-soc/msg36407.html).
Note that this still won't work as-is, this is just an RFC.
More fixes are needed in sh-mobile platform glue, and to resolve the bad
interaction with drivers/sh/pm_runtime.c and clk_disable_unused().
But none of these matter for e.g. discussing DT bindings.
With those fixed/worked around, functionality is almost equivalent to the
non-DT case. Missing are Run-Time management of the module clocks
(pm_clk_*()), and device latencies.
Thanks for your comments!
Geert Uytterhoeven (5):
PM / Domains: Add DT bindings for power-on/off latencies
PM / Domains: Add DT bindings for the R-Mobile System Controller
ARM: shmobile: R-Mobile: Store SYSC base address in rmobile_pm_domain
ARM: shmobile: R-Mobile: Add DT support for PM domains
ARM: shmobile: r8a7740 dtsi: Add PM domain support
.../devicetree/bindings/power/power_domain.txt | 6 +
.../bindings/power/renesas,sysc-rmobile.txt | 106 +++++++++++++
arch/arm/boot/dts/r8a7740.dtsi | 121 +++++++++++++++
arch/arm/mach-shmobile/Kconfig | 3 +-
arch/arm/mach-shmobile/pm-r8a7740.c | 14 ++
arch/arm/mach-shmobile/pm-rmobile.c | 169 +++++++++++++++++++--
arch/arm/mach-shmobile/pm-rmobile.h | 1 +
arch/arm/mach-shmobile/pm-sh7372.c | 11 ++
8 files changed, 417 insertions(+), 14 deletions(-)
create mode 100644 Documentation/devicetree/bindings/power/renesas,sysc-rmobile.txt
P.S. I did try "#power-domain-cells = <1>", but the hassle with sparse
definitions and error-prone multiple arrays (not unlikely, but even worse
than with the SMTP clock specifiers) was just too much. Not to mention
representing the C5 "always-on" power area...
renesas,pm-domain-indices = <
R8A7740_PD_A4LC R8A7740_PD_A4MP R8A7740_PD_D4
R8A7740_PD_A4R R8A7740_PD_A3RV R8A7740_PD_A4S
R8A7740_PD_A3SP R8A7740_PD_A3SM R8A7740_PD_A3SG
R8A7740_PD_A4SU
>;
renesas,pm-domain-names =
"A4LC", "A4MP", "D4", "A4R", "A3RV", "A4S", "A3SP",
"A3SM", "A3SG", "A4SU";
renesas,pm-domain-parents =
"", "", "", "", "A4R", "", "A4S", "A4S", "A4S", "";
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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