Re: [PATCH v3 2/2] arm64: dts: Add Mediatek SoC MT2712 and evaluation board dts and Makefile

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On 16/06/17 15:45, YT Shen wrote:
This adds basic chip support for Mediatek 2712

Signed-off-by: YT Shen <yt.shen@xxxxxxxxxxxx>
---
  arch/arm64/boot/dts/mediatek/Makefile       |   1 +
  arch/arm64/boot/dts/mediatek/mt2712-evb.dts |  32 ++++++
  arch/arm64/boot/dts/mediatek/mt2712e.dtsi   | 166 ++++++++++++++++++++++++++++
  3 files changed, 199 insertions(+)
  create mode 100644 arch/arm64/boot/dts/mediatek/mt2712-evb.dts
  create mode 100644 arch/arm64/boot/dts/mediatek/mt2712e.dtsi

diff --git a/arch/arm64/boot/dts/mediatek/Makefile b/arch/arm64/boot/dts/mediatek/Makefile
index 9fbfd32..fcc0604 100644
--- a/arch/arm64/boot/dts/mediatek/Makefile
+++ b/arch/arm64/boot/dts/mediatek/Makefile
@@ -1,3 +1,4 @@
+dtb-$(CONFIG_ARCH_MEDIATEK) += mt2712-evb.dtb
  dtb-$(CONFIG_ARCH_MEDIATEK) += mt6755-evb.dtb
  dtb-$(CONFIG_ARCH_MEDIATEK) += mt6795-evb.dtb
  dtb-$(CONFIG_ARCH_MEDIATEK) += mt8173-evb.dtb
diff --git a/arch/arm64/boot/dts/mediatek/mt2712-evb.dts b/arch/arm64/boot/dts/mediatek/mt2712-evb.dts
new file mode 100644
index 0000000..8c804df
--- /dev/null
+++ b/arch/arm64/boot/dts/mediatek/mt2712-evb.dts
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2017 MediaTek Inc.
+ * Author: YT Shen <yt.shen@xxxxxxxxxxxx>
+ *
+ * SPDX-License-Identifier: (GPL-2.0 OR MIT)
+ */
+
+/dts-v1/;
+#include "mt2712e.dtsi"
+
+/ {
+	model = "MediaTek MT2712 evaluation board";
+	compatible = "mediatek,mt2712-evb", "mediatek,mt2712";
+
+	aliases {
+		serial0 = &uart0;
+	};
+
+	memory@40000000 {
+		device_type = "memory";
+		reg = <0 0x40000000 0 0x80000000>;
+	};
+
+	chosen {
+		stdout-path = "serial0:921600n8";
+	};
+};
+
+&uart0 {
+	status = "okay";
+};
+
diff --git a/arch/arm64/boot/dts/mediatek/mt2712e.dtsi b/arch/arm64/boot/dts/mediatek/mt2712e.dtsi
new file mode 100644
index 0000000..65cdd4a
--- /dev/null
+++ b/arch/arm64/boot/dts/mediatek/mt2712e.dtsi
@@ -0,0 +1,166 @@
[...]
+
+	uart_clk: dummy26m {
+		compatible = "fixed-clock";
+		clock-frequency = <26000000>;
+		#clock-cells = <0>;
+	};
+
+	timer {
+		compatible = "arm,armv8-timer";
+		interrupt-parent = <&gic>;
+		interrupts = <GIC_PPI 13
+			      (GIC_CPU_MASK_RAW(0x13) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 14
+			      (GIC_CPU_MASK_RAW(0x13) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 11
+			      (GIC_CPU_MASK_RAW(0x13) | IRQ_TYPE_LEVEL_LOW)>,
+			     <GIC_PPI 10
+			      (GIC_CPU_MASK_RAW(0x13) | IRQ_TYPE_LEVEL_LOW)>;
+	};
+
+	soc {
+		#address-cells = <2>;
+		#size-cells = <2>;
+		compatible = "simple-bus";
+		ranges;
+
+		uart5: serial@1000f000 {
+			compatible = "mediatek,mt2712-uart",
+				     "mediatek,mt6577-uart";
+			reg = <0 0x1000f000 0 0x400>;
+			interrupts = <GIC_SPI 127 IRQ_TYPE_LEVEL_LOW>;
+			clocks = <&uart_clk>;

uart has two clocks, baud and bus clock. Please refer to the bindings descrption for more information, that's what they are for.

Please define the two dummy clocks with the correct frequency and use them.

Regards,
Matthias
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