linux-kernel - [RFC PATCH 10/10] arm64: dts: rockchip: Enable dmc and dfi nodes on gru.

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Date:   Mon, 14 May 2018 23:16:10 +0200
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     MyungJoo Ham <myungjoo.ham@...sung.com>,
        Kyungmin Park <kyungmin.park@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Rob Herring <robh+dt@...nel.org>,
        Will Deacon <will.deacon@....com>,
        Heiko Stuebner <heiko@...ech.de>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Sandy Huang <hjc@...k-chips.com>,
        David Airlie <airlied@...ux.ie>
Cc:     linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        Derek Basehore <dbasehore@...omium.org>,
        linux-clk@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        dri-devel@...ts.freedesktop.org, Lin Huang <hl@...k-chips.com>,
        kernel@...labora.com, Sean Paul <seanpaul@...omium.org>,
        linux-arm-kernel@...ts.infradead.org,
        Nickey Yang <nickey.yang@...k-chips.com>,
        Yakir Yang <kuankuan.y@...il.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Yao <markyao0591@...il.com>,
        Jacob Chen <jacob-chen@...wrt.com>,
        Kever Yang <kever.yang@...k-chips.com>,
        Brian Norris <briannorris@...omium.org>,
        Douglas Anderson <dianders@...omium.org>,
        Jeffy Chen <jeffy.chen@...k-chips.com>,
        Matthias Kaehlcke <mka@...omium.org>,
        devicetree@...r.kernel.org, Caesar Wang <wxt@...k-chips.com>,
        Chris Zhong <zyw@...k-chips.com>,
        Shunqian Zheng <zhengsq@...k-chips.com>,
        Mark Rutland <mark.rutland@....com>
Subject: [RFC PATCH 10/10] arm64: dts: rockchip: Enable dmc and dfi nodes on gru.

From: Lin Huang <hl@...k-chips.com>

Enable the DMC (Dynamic Memory Controller) and the DFI (DDR PHY Interface)
nodes on gru/kevin boards so we can support DDR DVFS.

Signed-off-by: Lin Huang <hl@...k-chips.com>
Signed-off-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>
---

 arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi | 21 ++++++++++++++++++++
 arch/arm64/boot/dts/rockchip/rk3399.dtsi     |  2 +-
 2 files changed, 22 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi b/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi
index 18f546f2dfd1..ba2cfdd082b8 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399-gru.dtsi
@@ -525,6 +525,12 @@
 	extcon = <&usbc_extcon0>, <&usbc_extcon1>;
 };
 
+&dmc_opp_table {
+	opp04 {
+		opp-suspend;
+	};
+};
+
 /*
  * Set some suspend operating points to avoid OVP in suspend
  *
@@ -600,6 +606,10 @@
 		<400000000>;
 };
 
+&display_subsystem {
+	devfreq = <&dmc>;
+};
+
 &emmc_phy {
 	status = "okay";
 };
@@ -766,6 +776,17 @@ ap_i2c_audio: &i2c8 {
 	status = "okay";
 };
 
+&dfi {
+	status = "okay";
+};
+
+&dmc {
+	status = "okay";
+	center-supply = <&ppvar_centerlogic>;
+	upthreshold = <25>;
+	downdifferential = <15>;
+};
+
 &sdhci {
 	/*
 	 * Signal integrity isn't great at 200 MHz and 150 MHz (DDR) gives the
diff --git a/arch/arm64/boot/dts/rockchip/rk3399.dtsi b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
index e012cc8ae3d4..518c742293fc 100644
--- a/arch/arm64/boot/dts/rockchip/rk3399.dtsi
+++ b/arch/arm64/boot/dts/rockchip/rk3399.dtsi
@@ -160,7 +160,7 @@
 		};
 	};
 
-	display-subsystem {
+	display_subsystem: display-subsystem {
 		compatible = "rockchip,display-subsystem";
 		ports = <&vopl_out>, <&vopb_out>;
 	};
-- 
2.17.0