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SubjectRe: [PATCH v5 26/39] nds32: Device tree support
On Tue, Jan 2, 2018 at 2:24 AM, Greentime Hu <green.hu@gmail.com> wrote:
> From: Greentime Hu <greentime@andestech.com>
>
> This patch adds support for device tree.
>
> Signed-off-by: Vincent Chen <vincentc@andestech.com>
> Signed-off-by: Greentime Hu <greentime@andestech.com>
> ---
> arch/nds32/boot/dts/Makefile | 8 +++++
> arch/nds32/boot/dts/ae3xx.dts | 73 +++++++++++++++++++++++++++++++++++++++++
> arch/nds32/kernel/devtree.c | 19 +++++++++++
> 3 files changed, 100 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..6b23d60
> --- /dev/null
> +++ b/arch/nds32/boot/dts/ae3xx.dts
> @@ -0,0 +1,73 @@
> +/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>;
> + next-level-cache = <&L2>;
> + };
> + };
> +
> + L2: l2-cache@e0500000 {
> + compatible = "andestech,atl2c";
> + reg = <0xe0500000 0x1000>;
> + cache-unified;
> + cache-level = <2>;
> + };
> +
> + apb: clk@0 {

unit address without reg is not valid. Drop the "@0".

> + #clock-cells = <0>;
> + compatible = "fixed-clock";
> + clock-frequency = <30000000>;
> + };
> +
> +
> + intc: interrupt-controller {
> + compatible = "andestech,ativic32";
> + #interrupt-cells = <1>;
> + interrupt-controller;
> + };
> +
> + serial0: serial@f0300000 {

All the memory mapped peripherals should be under at least one simple-bus node.

> + compatible = "andestech,uart16550", "ns16550a";
> + reg = <0xf0300000 0x1000>;
> + interrupts = <8>;
> + clock-frequency = <14745600>;
> + reg-shift = <2>;
> + reg-offset = <32>;
> + no-loopback-test = <1>;
> + };
> +
> + timer0: timer@f0400000 {
> + compatible = "andestech,atcpit100";
> + reg = <0xf0400000 0x1000>;
> + interrupts = <2>;
> + clocks = <&apb>;
> + clock-names = "PCLK";
> + };
> +
> + mac0: mac@e0100000 {

ethernet@...

> + 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
>

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