linux-kernel - [PATCH v4 24/36] nds32: Device tree support

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Message-Id: <8e4350bd85cada3eec445568d95bab06a9cbe9ef.1513577007.git.green.hu@gmail.com>
Date:   Mon, 18 Dec 2017 14:46:36 +0800
From:   Greentime Hu <green.hu@...il.com>
To:     greentime@...estech.com, linux-kernel@...r.kernel.org,
        arnd@...db.de, linux-arch@...r.kernel.org, tglx@...utronix.de,
        jason@...edaemon.net, marc.zyngier@....com, robh+dt@...nel.org,
        netdev@...r.kernel.org, deanbo422@...il.com,
        devicetree@...r.kernel.org, viro@...iv.linux.org.uk,
        dhowells@...hat.com, will.deacon@....com,
        daniel.lezcano@...aro.org, linux-serial@...r.kernel.org,
        geert.uytterhoeven@...il.com, linus.walleij@...aro.org,
        mark.rutland@....com, greg@...ah.com, ren_guo@...ky.com,
        pombredanne@...b.com
Cc:     green.hu@...il.com, Vincent Chen <vincentc@...estech.com>
Subject: [PATCH v4 24/36] nds32: Device tree support

From: Greentime Hu <greentime@...estech.com>

This patch adds support for device tree.

Signed-off-by: Vincent Chen <vincentc@...estech.com>
Signed-off-by: Greentime Hu <greentime@...estech.com>
---
 arch/nds32/boot/dts/Makefile  |    8 +++++
 arch/nds32/boot/dts/ae3xx.dts |   65 +++++++++++++++++++++++++++++++++++++++++
 arch/nds32/kernel/devtree.c   |   19 ++++++++++++
 3 files changed, 92 insertions(+)
 create mode 100644 arch/nds32/boot/dts/Makefile
 create mode 100644 arch/nds32/boot/dts/ae3xx.dts
 create mode 100644 arch/nds32/kernel/devtree.c

diff --git a/arch/nds32/boot/dts/Makefile b/arch/nds32/boot/dts/Makefile
new file mode 100644
index 0000000..d31faa8
--- /dev/null
+++ b/arch/nds32/boot/dts/Makefile
@@ -0,0 +1,8 @@
+ifneq '$(CONFIG_NDS32_BUILTIN_DTB)' '""'
+BUILTIN_DTB := $(patsubst "%",%,$(CONFIG_NDS32_BUILTIN_DTB)).dtb.o
+else
+BUILTIN_DTB :=
+endif
+obj-$(CONFIG_OF) += $(BUILTIN_DTB)
+
+clean-files := *.dtb *.dtb.S
diff --git a/arch/nds32/boot/dts/ae3xx.dts b/arch/nds32/boot/dts/ae3xx.dts
new file mode 100644
index 0000000..0ef2c44
--- /dev/null
+++ b/arch/nds32/boot/dts/ae3xx.dts
@@ -0,0 +1,65 @@
+/dts-v1/;
+/ {
+	compatible = "andestech,ae3xx";
+	#address-cells = <1>;
+	#size-cells = <1>;
+	interrupt-parent = <&intc>;
+
+	chosen {
+		stdout-path = &serial0;
+	};
+
+	memory@0 {
+		device_type = "memory";
+		reg = <0x00000000 0x40000000>;
+	};
+
+	cpus {
+		#address-cells = <1>;
+		#size-cells = <0>;
+		cpu@0 {
+			device_type = "cpu";
+			compatible = "andestech,n13", "andestech,nds32v3";
+			reg = <0>;
+			clock-frequency = <60000000>;
+		};
+	};
+
+	apb: clk@0 {
+		#clock-cells = <0>;
+		compatible = "fixed-clock";
+		clock-frequency = <30000000>;
+	};
+
+
+	intc: interrupt-controller {
+		compatible = "andestech,ativic32";
+		#interrupt-cells = <1>;
+		interrupt-controller;
+	};
+
+	serial0: serial@...00000 {
+		compatible = "andestech,uart16550", "ns16550a";
+		reg = <0xf0300000 0x1000>;
+		interrupts = <8>;
+		clock-frequency = <14745600>;
+		reg-shift = <2>;
+		reg-offset = <32>;
+		no-loopback-test = <1>;
+	};
+
+	timer0: timer@...00000 {
+		compatible = "andestech,atcpit100";
+		reg = <0xf0400000 0x1000>;
+		interrupts = <2>;
+		clocks = <&apb>;
+		clock-names = "PCLK";
+	};
+
+	mac0: mac@...00000 {
+		compatible = "andestech,atmac100";
+		reg = <0xe0100000 0x1000>;
+		interrupts = <18>;
+	};
+
+};
diff --git a/arch/nds32/kernel/devtree.c b/arch/nds32/kernel/devtree.c
new file mode 100644
index 0000000..bdce0fe
--- /dev/null
+++ b/arch/nds32/kernel/devtree.c
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: GPL-2.0
+// Copyright (C) 2005-2017 Andes Technology Corporation
+
+#include <linux/bug.h>
+#include <linux/printk.h>
+#include <linux/of_fdt.h>
+
+void __init early_init_devtree(void *params)
+{
+	if (!params || !early_init_dt_scan(params)) {
+		pr_crit("\n"
+			"Error: invalid device tree blob at (virtual address 0x%p)\n"
+			"\nPlease check your bootloader.", params);
+
+		BUG_ON(1);
+	}
+
+	dump_stack_set_arch_desc("%s (DT)", of_flat_dt_get_machine_name());
+}
-- 
1.7.9.5