On 02/03/15 14:17, Beata Michalska wrote:
> Use assigned-clocks/assigned-clock-parents properties for
> CMU clock controller DT node to secure proper clock setup:
> switching the two muxes to root oscillator clock is not only
> required for proper powering down the ISP power domain,
> but it also reduces the risk of accessing the ISP CMU
> registers while the ISP power domain remains turned off
> (i.e. through the common clock framework by clk_summary)
>
> Signed-off-by: Beata Michalska <b.michalska@xxxxxxxxxxx>
> Acked-by: Kyungmin Park <kyungmin.park@xxxxxxxxxxx>
Acked-by: Sylwester Nawrocki <s.nawrocki@xxxxxxxxxxx>
Kukjin, please merge this patch for v4.1. I merged the exynos3250
CMU ISP driver patch and we will have regression if $subject patch
is not applied, i.e. reading /sys/kernel/debug/clk/clk_summary
would cause system hang on exynos3250.
> ---
> arch/arm/boot/dts/exynos3250.dtsi | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/arch/arm/boot/dts/exynos3250.dtsi b/arch/arm/boot/dts/exynos3250.dtsi
> index 277b48b..6d6118e 100644
> --- a/arch/arm/boot/dts/exynos3250.dtsi
> +++ b/arch/arm/boot/dts/exynos3250.dtsi
> @@ -172,6 +172,10 @@
> compatible = "samsung,exynos3250-cmu";
> reg = <0x10030000 0x20000>;
> #clock-cells = <1>;
> + assigned-clocks = <&cmu CLK_MOUT_ACLK_400_MCUISP_SUB>,
> + <&cmu CLK_MOUT_ACLK_266_SUB>;
> + assigned-clock-parents = <&cmu CLK_FIN_PLL>,
> + <&cmu CLK_FIN_PLL>;
> };
>
> cmu_dmc: clock-controller@105C0000 {
>
Thanks,
Sylwester
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