linux-kernel - [PATCH v1 3/4] arm64: dts: add DRAMC node for MT6779

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Date:   Tue, 30 Mar 2021 13:22:10 +0800
From:   Po-Kai Chi <pk.chi@...iatek.com>
To:     Matthias Brugger <matthias.bgg@...il.com>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>, <devicetree@...r.kernel.org>,
        <wsd_upstream@...iatek.com>, CC Hwang <cc.hwang@...iatek.com>,
        Loda Chou <loda.chou@...iatek.com>,
        Po-Kai Chi <pk.chi@...iatek.com>
Subject: [PATCH v1 3/4] arm64: dts: add DRAMC node for MT6779

Add the DRAMC node for the DRAMC kernel driver.

Properties are divided into three categories:
  - Platform DTS:
      MediaTek DRAMC platform common part.

  - Project DTS:
      Runtime filled in by bootloader according to the board
      hardware configuration.

  - Driver level:
      Hardware-specific register settings, encapsulated as
      compatible data for better DTS compatibility.

Signed-off-by: Po-Kai Chi <pk.chi@...iatek.com>
---
 arch/arm64/boot/dts/mediatek/mt6779-evb.dts |    9 +++++++++
 arch/arm64/boot/dts/mediatek/mt6779.dtsi    |   18 ++++++++++++++++++
 2 files changed, 27 insertions(+)

diff --git a/arch/arm64/boot/dts/mediatek/mt6779-evb.dts b/arch/arm64/boot/dts/mediatek/mt6779-evb.dts
index 164f5cb..9a556ad 100644
--- a/arch/arm64/boot/dts/mediatek/mt6779-evb.dts
+++ b/arch/arm64/boot/dts/mediatek/mt6779-evb.dts
@@ -29,3 +29,12 @@
 &uart0 {
 	status = "okay";
 };
+
+&dramc {
+	dram_type = <0>;
+	channel_cnt = <2>;
+	rank_cnt = <2>;
+	rank_size = <0x0 0x0>;
+	mr_cnt = <1>;
+	mr = <0x5 0xff>;
+};
diff --git a/arch/arm64/boot/dts/mediatek/mt6779.dtsi b/arch/arm64/boot/dts/mediatek/mt6779.dtsi
index 9bdf514..332d48d 100644
--- a/arch/arm64/boot/dts/mediatek/mt6779.dtsi
+++ b/arch/arm64/boot/dts/mediatek/mt6779.dtsi
@@ -206,6 +206,24 @@
 			clock-names = "devapc-infra-clock";
 		};
 
+		dramc: dramc@...30000 {
+			compatible = "mediatek,mt6779-dramc";
+			reg = <0 0x10230000 0 0x2000>, /* DRAMC AO CHA */
+				<0 0x10240000 0 0x2000>, /* DRAMC AO CHB */
+				<0 0x10234000 0 0x1000>, /* DRAMC NAO CHA */
+				<0 0x10244000 0 0x1000>, /* DRAMC NAO CHB */
+				<0 0x10238000 0 0x2000>, /* DDRPHY AO CHA */
+				<0 0x10248000 0 0x2000>; /* DDRPHY AO CHB */
+			support_channel_cnt = <2>;
+			freq_cnt = <6>;
+			freq_step = <3718 3733>,
+				<3094 3200>,
+				<2392 2400>,
+				<1534 1600>,
+				<1196 1200>,
+				<754 800>;
+		};
+
 		uart0: serial@...02000 {
 			compatible = "mediatek,mt6779-uart",
 				     "mediatek,mt6577-uart";
-- 
1.7.9.5