Re: [PATCH v3 0/4] clk: st: New always-on clock domain

From: Lee Jones
Date: Wed Mar 04 2015 - 07:00:17 EST


Mike,

Do you want me to resend this set with Robert's Reviewed-by applied,
or are you happy to apply it yourself?

> v2 => v3:
> - Ensure DT actually reflects h/w
> - i.e. Nodes should not contain a mishmash of different IP
> blocks, but should identify related h/w. In the current
> example we use interconnects
> - Change naming from clkdomain to clk-always-on
> - Place "do not abuse" warning in documentation
>
> v1 => v2:
> - Turned the ST specific driver into a generic one
>
> Hardware can have a bunch of clocks which must not be turned off.
> If drivers a) fail to obtain a reference to any of these or b) give
> up a previously obtained reference during suspend, the common clk
> framework will attempt to turn them off and the hardware will
> subsequently die. The only way to recover from this failure is to
> restart.
>
> To avoid either of these two scenarios from catastrophically
> disabling the running system we have implemented a clock domain
> where clocks are consumed and references are taken, thus preventing
> them from being shut down by the framework.
>
> *** BLURB HERE ***
>
> Lee Jones (4):
> ARM: sti: stih407-family: Supply defines for CLOCKGEN A0
> ARM: sti: stih407-family: Add platform interconnects to always-on clk
> domain
> clk: Provide an always-on clock domain framework
> clk: dt: Introduce always-on clock domain documentation
>
> .../devicetree/bindings/clock/clk-always-on.txt | 35 ++++++++++++
> arch/arm/boot/dts/stih407-family.dtsi | 15 ++++++
> drivers/clk/Makefile | 1 +
> drivers/clk/clk-always-on.c | 62 ++++++++++++++++++++++
> include/dt-bindings/clock/stih407-clks.h | 4 ++
> 5 files changed, 117 insertions(+)
> create mode 100644 Documentation/devicetree/bindings/clock/clk-always-on.txt
> create mode 100644 drivers/clk/clk-always-on.c
>

--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org â Open source software for ARM SoCs
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