linux-kernel - [PATCH RFC v6 4/6] ARM: dts: exynos: Add interconnect properties to Exynos4412 bus nodes

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Message-Id: <20200702163724.2218-5-s.nawrocki@samsung.com>
Date:   Thu,  2 Jul 2020 18:37:22 +0200
From:   Sylwester Nawrocki <s.nawrocki@...sung.com>
To:     georgi.djakov@...aro.org, cw00.choi@...sung.com, krzk@...nel.org
Cc:     devicetree@...r.kernel.org, robh+dt@...nel.org,
        a.swigon@...sung.com, myungjoo.ham@...sung.com,
        inki.dae@...sung.com, sw0312.kim@...sung.com,
        b.zolnierkie@...sung.com, m.szyprowski@...sung.com,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        linux-samsung-soc@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org, s.nawrocki@...sung.com
Subject: [PATCH RFC v6 4/6] ARM: dts: exynos: Add interconnect properties to
 Exynos4412 bus nodes

This patch adds the following properties for Exynos4412 interconnect
bus nodes:
 - samsung,interconnect-parent: to declare connections between
   nodes in order to guarantee PM QoS requirements between nodes,
 - #interconnect-cells: required by the interconnect framework,
 - bus-width: the bus width in bits, required to properly derive
   minimum bus clock frequency from requested bandwidth for each
   bus.

Note that #interconnect-cells is always zero and node IDs are not
hardcoded anywhere.

Signed-off-by: Artur Świgoń <a.swigon@...sung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@...sung.com>
Reviewed-by: Chanwoo Choi <cw00.choi@...sung.com>
---
Changes for v6:
 - added bus-width property in bus_dmc node.

Changes for v5:
 - adjust to renamed exynos,interconnect-parent-node property,
 - add properties in common exynos4412.dtsi file rather than
   in Odroid specific odroid4412-odroid-common.dtsi.
---
 arch/arm/boot/dts/exynos4412.dtsi | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm/boot/dts/exynos4412.dtsi b/arch/arm/boot/dts/exynos4412.dtsi
index 4886894..24529d4 100644
--- a/arch/arm/boot/dts/exynos4412.dtsi
+++ b/arch/arm/boot/dts/exynos4412.dtsi
@@ -381,6 +381,8 @@
 			clocks = <&clock CLK_DIV_DMC>;
 			clock-names = "bus";
 			operating-points-v2 = <&bus_dmc_opp_table>;
+			bus-width = <4>;
+			#interconnect-cells = <0>;
 			status = "disabled";
 		};

@@ -450,6 +452,8 @@
 			clocks = <&clock CLK_DIV_GDL>;
 			clock-names = "bus";
 			operating-points-v2 = <&bus_leftbus_opp_table>;
+			samsung,interconnect-parent = <&bus_dmc>;
+			#interconnect-cells = <0>;
 			status = "disabled";
 		};

@@ -466,6 +470,8 @@
 			clocks = <&clock CLK_ACLK160>;
 			clock-names = "bus";
 			operating-points-v2 = <&bus_display_opp_table>;
+			samsung,interconnect-parent = <&bus_leftbus>;
+			#interconnect-cells = <0>;
 			status = "disabled";
 		};

--
2.7.4