On Thursday 30 January 2014 01:10 PM, Ivan Khoronzhuk wrote:
> At late init all unused clocks are disabled. So clocks that were not
> get before will be gated. In Keysone 2 SoC we have at least one
> necessary clock that is not used by any driver - "msmcsram". This
> clock is necessary, because it supplies the Multicore Shared Memory
> Controller (MSMC). MSMC is the coherency interconnect and all the
> coherent masters are connected to it including devices which are not
> under Linux OS control. MSMC clock should not be touched even in low
> power states.
>
> So drop the clock node, otherwise 'clk_ignore_unused' parameter will
> disable the clock leading to system stall.
>
> Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@xxxxxx>
> ---
> Based on
> git://git.kernel.org/pub/scm/linux/kernel/git/ssantosh/linux-keystone.git
> keystone/master
>
> v1..v2:
> - dropped "msmcsram" clock node, instead disabling
> - updated comment message
>
Thanks for the update. Would be good to get blessing from DT folks.
I want to send this one during the rc's since its a bug fix.
> arch/arm/boot/dts/keystone-clocks.dtsi | 10 ----------
> 1 file changed, 10 deletions(-)
>
> diff --git a/arch/arm/boot/dts/keystone-clocks.dtsi b/arch/arm/boot/dts/keystone-clocks.dtsi
> index 2363593..98ad488 100644
> --- a/arch/arm/boot/dts/keystone-clocks.dtsi
> +++ b/arch/arm/boot/dts/keystone-clocks.dtsi
> @@ -327,16 +327,6 @@ clocks {
> domain-id = <6>;
> };
>
> - clkmsmcsram: clkmsmcsram {
> - #clock-cells = <0>;
> - compatible = "ti,keystone,psc-clock";
> - clocks = <&chipclk1>;
> - clock-output-names = "msmcsram";
> - reg = <0x02350038 0xb00>, <0x0235001c 0x400>;
> - reg-names = "control", "domain";
> - domain-id = <7>;
> - };
> -
> clkgem0: clkgem0 {
> #clock-cells = <0>;
> compatible = "ti,keystone,psc-clock";
>
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