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

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Date:	Wed, 4 Mar 2015 12:00:03 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:	kernel@...inux.com, mturquette@...aro.org, sboyd@...eaurora.org,
	devicetree@...r.kernel.org
Subject: Re: [PATCH v3 0/4] clk: st: New always-on clock domain

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 │ Open source software for ARM SoCs
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