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SubjectRe: [RFC PATCH v3 4/7] arm: dts: exynos: Add interconnect bindings for Exynos4412
From
Date
Hi,

On Wed, 2020-01-22 at 18:54 +0200, Georgi Djakov wrote:
> Hi Artur,
>
> Thank you for your continuous work on this.
>
> On 12/20/19 13:56, Artur Świgoń wrote:
> > This patch adds the following properties to the Exynos4412 DT:
> > - exynos,interconnect-parent-node: to declare connections between
> > nodes in order to guarantee PM QoS requirements between nodes;
>
> Is this DT property documented somewhere? I believe that there should be a patch
> to document it somewhere in Documentation/devicetree/bindings/ before using it.

It will be documented in Documentation/devicetree/bindings/devfreq/exynos-bus.txt
in the next version.

> > - #interconnect-cells: required by the interconnect framework.
> >
> > Note that #interconnect-cells is always zero and node IDs are not
> > hardcoded anywhere.
> >
> > Signed-off-by: Artur Świgoń <a.swigon@samsung.com>
> > ---
> > arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 5 +++++
> > 1 file changed, 5 insertions(+)
> >
> > diff --git a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> > index 4ce3d77a6704..d9d70eacfcaf 100644
> > --- a/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> > +++ b/arch/arm/boot/dts/exynos4412-odroid-common.dtsi
> > @@ -90,6 +90,7 @@
> > &bus_dmc {
> > exynos,ppmu-device = <&ppmu_dmc0_3>, <&ppmu_dmc1_3>;
> > vdd-supply = <&buck1_reg>;
> > + #interconnect-cells = <0>;
> > status = "okay";
> > };
> >
> > @@ -106,6 +107,8 @@
> > &bus_leftbus {
> > exynos,ppmu-device = <&ppmu_leftbus_3>, <&ppmu_rightbus_3>;
> > vdd-supply = <&buck3_reg>;
> > + exynos,interconnect-parent-node = <&bus_dmc>;
> > + #interconnect-cells = <0>;
> > status = "okay";
> > };
> >
> > @@ -116,6 +119,8 @@
> >
> > &bus_display {
> > exynos,parent-bus = <&bus_leftbus>;
> > + exynos,interconnect-parent-node = <&bus_leftbus>;
> > + #interconnect-cells = <0>;
> > status = "okay";
> > };

--
Artur Świgoń
Samsung R&D Institute Poland
Samsung Electronics


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