From: Keguang Zhang <keguang.zhang@gmail.com>
Add a device tree for LS1B-DEMO board, supporting CPU, clock, INTC,
UART, Ethernet, GPIO, USB host, RTC, watchdog, DMA, NAND, and AC97.
Additionally, since the current bootloader for Loongson1 does not support
FDT, introduce CONFIG_BUILTIN_DTB_NAME to enable a built-in DTB.
Signed-off-by: Keguang Zhang <keguang.zhang@gmail.com>
---
MAINTAINERS | 1 +
arch/mips/boot/dts/Makefile | 1 +
arch/mips/boot/dts/loongson/Makefile | 6 +
arch/mips/boot/dts/loongson/loongson1.dtsi | 136 +++++++++++++++++++
arch/mips/boot/dts/loongson/loongson1b.dtsi | 198 ++++++++++++++++++++++++++++
arch/mips/boot/dts/loongson/ls1b-demo.dts | 108 +++++++++++++++
6 files changed, 450 insertions(+)
diff --git a/MAINTAINERS b/MAINTAINERS
index c3f7fbd0d67a..0089ebca31cf 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -16683,6 +16683,7 @@ M: Keguang Zhang <keguang.zhang@gmail.com>
L: linux-mips@vger.kernel.org
S: Maintained
F: Documentation/devicetree/bindings/*/loongson,ls1*.yaml
+F: arch/mips/boot/dts/loongson/loongson1*
F: arch/mips/include/asm/mach-loongson32/
F: arch/mips/loongson32/
F: drivers/*/*loongson1*
diff --git a/arch/mips/boot/dts/Makefile b/arch/mips/boot/dts/Makefile
index 7375c6ced82b..6d9dbe945541 100644
--- a/arch/mips/boot/dts/Makefile
+++ b/arch/mips/boot/dts/Makefile
@@ -8,6 +8,7 @@ subdir-$(CONFIG_FIT_IMAGE_FDT_BOSTON) += img
subdir-$(CONFIG_MACH_INGENIC) += ingenic
subdir-$(CONFIG_LANTIQ) += lantiq
subdir-$(CONFIG_MACH_LOONGSON64) += loongson
+subdir-$(CONFIG_MACH_LOONGSON32) += loongson
subdir-$(CONFIG_SOC_VCOREIII) += mscc
subdir-$(CONFIG_MIPS_MALTA) += mti
subdir-$(CONFIG_LEGACY_BOARD_SEAD3) += mti
diff --git a/arch/mips/boot/dts/loongson/Makefile b/arch/mips/boot/dts/loongson/Makefile
index 5e3ab984d70f..2facf251fb6a 100644
--- a/arch/mips/boot/dts/loongson/Makefile
+++ b/arch/mips/boot/dts/loongson/Makefile
@@ -5,3 +5,9 @@ dtb-$(CONFIG_MACH_LOONGSON64) += loongson64c_4core_rs780e.dtb
dtb-$(CONFIG_MACH_LOONGSON64) += loongson64c_8core_rs780e.dtb
dtb-$(CONFIG_MACH_LOONGSON64) += loongson64g_4core_ls7a.dtb
dtb-$(CONFIG_MACH_LOONGSON64) += loongson64v_4core_virtio.dtb
+
+ifneq ($(CONFIG_BUILTIN_DTB_NAME),)
+dtb-y := $(addsuffix .dtb, $(CONFIG_BUILTIN_DTB_NAME))
+else
+dtb-$(CONFIG_MACH_LOONGSON32) += ls1b-demo.dtb
+endif
diff --git a/arch/mips/boot/dts/loongson/loongson1.dtsi b/arch/mips/boot/dts/loongson/loongson1.dtsi
new file mode 100644
index 000000000000..5ba5a5d131ba
--- /dev/null
+++ b/arch/mips/boot/dts/loongson/loongson1.dtsi
@@ -0,0 +1,136 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023-2025 Keguang Zhang <keguang.zhang@gmail.com>
+ */
+
+/dts-v1/;
+
+#include <dt-bindings/clock/loongson,ls1x-clk.h>
+#include <dt-bindings/interrupt-controller/irq.h>
+
+/ {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ xtal: clock {
+ compatible = "fixed-clock";
+ clock-output-names = "xtal";
+ #clock-cells = <0>;
+ };
+
+ cpus {
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ cpu0: cpu@0 {
+ reg = <0>;
+ device_type = "cpu";
+ clocks = <&clkc LS1X_CLKID_CPU>;
+ #clock-cells = <1>;
+ };
+ };
+
+ cpu_intc: interrupt-controller {
+ compatible = "mti,cpu-interrupt-controller";
+ interrupt-controller;
+ #interrupt-cells = <1>;
+ #address-cells = <0>;
+ };
+
+ soc: bus@1fd00000 {
+ compatible = "simple-bus";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0x0 0x1fd00000 0x130000>;
+
+ intc0: interrupt-controller@1040 {
+ compatible = "loongson,ls1x-intc";
+ reg = <0x1040 0x18>;
+ interrupt-controller;
+ interrupt-parent = <&cpu_intc>;
+ interrupts = <2>;
+ #interrupt-cells = <2>;
+ };
+
+ intc1: interrupt-controller@1058 {
+ compatible = "loongson,ls1x-intc";
+ reg = <0x1058 0x18>;
+ interrupt-controller;
+ interrupt-parent = <&cpu_intc>;
+ interrupts = <3>;
+ #interrupt-cells = <2>;
+ };
+
+ intc2: interrupt-controller@1070 {
+ compatible = "loongson,ls1x-intc";
+ reg = <0x1070 0x18>;
+ interrupt-controller;
+ interrupt-parent = <&cpu_intc>;
+ interrupts = <4>;
+ #interrupt-cells = <2>;
+ };
+
+ intc3: interrupt-controller@1088 {
+ compatible = "loongson,ls1x-intc";
+ reg = <0x1088 0x18>;
+ interrupt-controller;
+ interrupt-parent = <&cpu_intc>;
+ interrupts = <5>;
+ #interrupt-cells = <2>;
+ };
+
+ gpio0: gpio@10c0 {
+ compatible = "loongson,ls1x-gpio";
+ reg = <0x10c0 0x4>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+
+ gpio1: gpio@10c4 {
+ compatible = "loongson,ls1x-gpio";
+ reg = <0x10c4 0x4>;
+ gpio-controller;
+ #gpio-cells = <2>;
+ };
+ };
+
+ apb: bus@1fe40000 {
+ compatible = "simple-bus";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges = <0x0 0x1fe40000 0xc0000>;
+
+ uart0: serial@0 {
+ compatible = "ns16550a";
+ reg = <0x0 0x8>;
+ clocks = <&clkc LS1X_CLKID_APB>;
+ interrupt-parent = <&intc0>;
+ interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
+ status = "disabled";
+ };
+
+ uart1: serial@4000 {
+ compatible = "ns16550a";
+ reg = <0x4000 0x8>;
+ clocks = <&clkc LS1X_CLKID_APB>;
+ interrupt-parent = <&intc0>;
+ status = "disabled";
+ };
+
+ uart2: serial@8000 {
+ compatible = "ns16550a";
+ reg = <0x8000 0x8>;
+ clocks = <&clkc LS1X_CLKID_APB>;
+ interrupt-parent = <&intc0>;
+ status = "disabled";
+ };
+
+ uart3: serial@c000 {
+ compatible = "ns16550a";
+ reg = <0xc000 0x8>;
+ clocks = <&clkc LS1X_CLKID_APB>;
+ interrupt-parent = <&intc0>;
+ status = "disabled";
+ };
+ };
+};
diff --git a/arch/mips/boot/dts/loongson/loongson1b.dtsi b/arch/mips/boot/dts/loongson/loongson1b.dtsi
new file mode 100644
index 000000000000..9fd3bc676706
--- /dev/null
+++ b/arch/mips/boot/dts/loongson/loongson1b.dtsi
@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023-2025 Keguang Zhang <keguang.zhang@gmail.com>
+ */
+
+/dts-v1/;
+#include "loongson1.dtsi"
+
+/ {
+ cpu_opp_table: opp-table {
+ compatible = "operating-points-v2";
+ opp-shared;
+
+ opp-44000000 {
+ opp-hz = /bits/ 64 <44000000>;
+ };
+ opp-47142000 {
+ opp-hz = /bits/ 64 <47142000>;
+ };
+ opp-50769000 {
+ opp-hz = /bits/ 64 <50769000>;
+ };
+ opp-55000000 {
+ opp-hz = /bits/ 64 <55000000>;
+ };
+ opp-60000000 {
+ opp-hz = /bits/ 64 <60000000>;
+ };
+ opp-66000000 {
+ opp-hz = /bits/ 64 <66000000>;
+ };
+ opp-73333000 {
+ opp-hz = /bits/ 64 <73333000>;
+ };
+ opp-82500000 {
+ opp-hz = /bits/ 64 <82500000>;
+ };
+ opp-94285000 {
+ opp-hz = /bits/ 64 <94285000>;
+ };
+ opp-110000000 {
+ opp-hz = /bits/ 64 <110000000>;
+ };
+ opp-132000000 {
+ opp-hz = /bits/ 64 <132000000>;
+ };
+ opp-165000000 {
+ opp-hz = /bits/ 64 <165000000>;
+ };
+ opp-220000000 {
+ opp-hz = /bits/ 64 <220000000>;
+ };
+ };
+
+ clocksource: timer@1fe5c030 {
+ compatible = "loongson,ls1b-pwmtimer";
+ reg = <0x1fe5c030 0x10>;
+ clocks = <&clkc LS1X_CLKID_APB>;
+ interrupt-parent = <&intc0>;
+ interrupts = <20 IRQ_TYPE_LEVEL_HIGH>;
+ };
+
+ clkc: clock-controller@1fe78030 {
+ compatible = "loongson,ls1b-clk";
+ reg = <0x1fe78030 0x8>;
+ clocks = <&xtal>;
+ #clock-cells = <1>;
+ };
+};
+
+&soc {
+ syscon: syscon@420 {
+ compatible = "loongson,ls1b-syscon", "syscon";
+ reg = <0x420 0x8>;
+ };
+
+ dma: dma-controller@1160 {
+ compatible = "loongson,ls1b-apbdma";
+ reg = <0x1160 0x4>;
+ interrupt-parent = <&intc0>;
+ interrupts = <13 IRQ_TYPE_EDGE_RISING>,
+ <14 IRQ_TYPE_EDGE_RISING>,
+ <15 IRQ_TYPE_EDGE_RISING>;
+ interrupt-names = "ch0", "ch1", "ch2";
+ #dma-cells = <1>;
+ };
+
+ ehci: usb@100000 {
+ compatible = "generic-ehci";
+ reg = <0x100000 0x100>;
+ interrupt-parent = <&intc1>;
+ interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
+ status = "disabled";
+ };
+
+ ohci: usb@108000 {
+ compatible = "generic-ohci";
+ reg = <0x108000 0x100>;
+ interrupt-parent = <&intc1>;
+ interrupts = <1 IRQ_TYPE_LEVEL_HIGH>;
+ status = "disabled";
+ };
+
+ gmac0: ethernet@110000 {
+ compatible = "loongson,ls1b-gmac", "snps,dwmac-3.50a";
+ reg = <0x110000 0x10000>;
+ clocks = <&clkc LS1X_CLKID_AHB>;
+ clock-names = "stmmaceth";
+ interrupt-parent = <&intc1>;
+ interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
+ interrupt-names = "macirq";
+ loongson,ls1-syscon = <&syscon>;
+ snps,pbl = <1>;
+ status = "disabled";
+ };
+
+ gmac1: ethernet@120000 {
+ compatible = "loongson,ls1b-gmac", "snps,dwmac-3.50a";
+ reg = <0x120000 0x10000>;
+ clocks = <&clkc LS1X_CLKID_AHB>;
+ clock-names = "stmmaceth";
+ interrupt-parent = <&intc1>;
+ interrupts = <3 IRQ_TYPE_LEVEL_HIGH>;
+ interrupt-names = "macirq";
+ loongson,ls1-syscon = <&syscon>;
+ snps,pbl = <1>;
+ status = "disabled";
+ };
+};
+
+&apb {
+ watchdog: watchdog@1c060 {
+ compatible = "loongson,ls1b-wdt";
+ reg = <0x1c060 0xc>;
+ clocks = <&clkc LS1X_CLKID_APB>;
+ status = "disabled";
+ };
+
+ rtc: rtc@24000 {
+ compatible = "loongson,ls1b-rtc";
+ reg = <0x24000 0x78>;
+ interrupt-parent = <&intc0>;
+ interrupts = <24 IRQ_TYPE_LEVEL_HIGH>;
+ status = "disabled";
+ };
+
+ ac97: audio-controller@34000 {
+ compatible = "loongson,ls1b-ac97";
+ reg = <0x34000 0x60>, <0x32420 0x4>, <0x34c4c 0x4>;
+ reg-names = "ac97", "audio-tx", "audio-rx";
+ dmas = <&dma 1>, <&dma 2>;
+ dma-names = "tx", "rx";
+ #sound-dai-cells = <0>;
+ status = "disabled";
+ };
+
+ nand: nand-controller@38000 {
+ compatible = "loongson,ls1b-nand-controller";
+ reg = <0x38000 0x24>, <0x38040 0x4>;
+ reg-names = "nand", "nand-dma";
+ dmas = <&dma 0>;
+ dma-names = "rxtx";
+ #address-cells = <1>;
+ #size-cells = <0>;
+ status = "disabled";
+
+ nand@0 {
+ reg = <0>;
+ label = "ls1x-nand";
+ nand-use-soft-ecc-engine;
+ nand-ecc-algo = "hamming";
+ };
+ };
+};
+
+&cpu0 {
+ operating-points-v2 = <&cpu_opp_table>;
+};
+
+&gpio0 {
+ ngpios = <31>;
+};
+
+&gpio1 {
+ ngpios = <30>;
+};
+
+&uart1 {
+ interrupts = <3 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&uart2 {
+ interrupts = <4 IRQ_TYPE_LEVEL_HIGH>;
+};
+
+&uart3 {
+ interrupts = <5 IRQ_TYPE_LEVEL_HIGH>;
+};
diff --git a/arch/mips/boot/dts/loongson/ls1b-demo.dts b/arch/mips/boot/dts/loongson/ls1b-demo.dts
new file mode 100644
index 000000000000..19ea772e6649
--- /dev/null
+++ b/arch/mips/boot/dts/loongson/ls1b-demo.dts
@@ -0,0 +1,108 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2023-2025 Keguang Zhang <keguang.zhang@gmail.com>
+ */
+
+/dts-v1/;
+
+#include <dt-bindings/gpio/gpio.h>
+
+#include "loongson1b.dtsi"
+
+/ {
+ compatible = "loongson,ls1b-demo", "loongson,ls1b";
+ model = "LS1B-DEMO Board";
+
+ memory@0 {
+ device_type = "memory";
+ reg = <0x0 0x10000000>;
+ };
+
+ aliases {
+ ethernet0 = &gmac0;
+ ethernet1 = &gmac1;
+ gpio0 = &gpio0;
+ gpio1 = &gpio1;
+ serial0 = &uart0;
+ };
+
+ chosen {
+ bootargs = "console=ttyS0,38400";
+ stdout-path = "serial0:38400n8";
+ };
+
+ codec: audio-codec {
+ compatible = "realtek,alc203";
+ #sound-dai-cells = <0>;
+ };
+
+ sound {
+ compatible = "simple-audio-card";
+ simple-audio-card,name = "ls1b-alc203";
+ simple-audio-card,format = "ac97";
+ simple-audio-card,widgets =
+ "Speaker", "Line Out Jack",
+ "Headphone", "Headphone Jack",
+ "Microphone", "Microphone Jack";
+ simple-audio-card,routing =
+ "Line Out Jack", "TX",
+ "Headphone Jack", "TX",
+ "RX", "Microphone Jack";
+
+ simple-audio-card,cpu {
+ sound-dai = <&ac97>;
+ };
+
+ simple-audio-card,codec {
+ sound-dai = <&codec>;
+ };
+ };
+};
+
+&gmac0 {
+ phy-handle = <&phy0>;
+ phy-mode = "rgmii-id";
+ status = "okay";
+
+ mdio {
+ compatible = "snps,dwmac-mdio";
+ #address-cells = <1>;
+ #size-cells = <0>;
+
+ phy0: ethernet-phy@0 {
+ reg = <0x0>;
+ };
+ };
+};
+
+&xtal {
+ clock-frequency = <33000000>;
+};
+
+&ac97 {
+ status = "okay";
+};
+
+&ehci {
+ status = "okay";
+};
+
+&ohci {
+ status = "okay";
+};
+
+&nand {
+ status = "okay";
+};
+
+&rtc {
+ status = "okay";
+};
+
+&uart0 {
+ status = "okay";
+};
+
+&watchdog {
+ status = "okay";
+};
--
2.43.0On Wed, Jul 09, 2025 at 07:05:54PM +0800, Keguang Zhang wrote:
> Add a device tree for LS1B-DEMO board, supporting CPU, clock, INTC,
> UART, Ethernet, GPIO, USB host, RTC, watchdog, DMA, NAND, and AC97.
>
> Additionally, since the current bootloader for Loongson1 does not support
> FDT, introduce CONFIG_BUILTIN_DTB_NAME to enable a built-in DTB.
>
> Signed-off-by: Keguang Zhang <keguang.zhang@gmail.com>
> ---
> MAINTAINERS | 1 +
> arch/mips/boot/dts/Makefile | 1 +
> arch/mips/boot/dts/loongson/Makefile | 6 +
> arch/mips/boot/dts/loongson/loongson1.dtsi | 136 +++++++++++++++++++
> arch/mips/boot/dts/loongson/loongson1b.dtsi | 198 ++++++++++++++++++++++++++++
> arch/mips/boot/dts/loongson/ls1b-demo.dts | 108 +++++++++++++++
> 6 files changed, 450 insertions(+)
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index c3f7fbd0d67a..0089ebca31cf 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -16683,6 +16683,7 @@ M: Keguang Zhang <keguang.zhang@gmail.com>
> L: linux-mips@vger.kernel.org
> S: Maintained
> F: Documentation/devicetree/bindings/*/loongson,ls1*.yaml
> +F: arch/mips/boot/dts/loongson/loongson1*
> F: arch/mips/include/asm/mach-loongson32/
> F: arch/mips/loongson32/
> F: drivers/*/*loongson1*
> diff --git a/arch/mips/boot/dts/Makefile b/arch/mips/boot/dts/Makefile
> index 7375c6ced82b..6d9dbe945541 100644
> --- a/arch/mips/boot/dts/Makefile
> +++ b/arch/mips/boot/dts/Makefile
> @@ -8,6 +8,7 @@ subdir-$(CONFIG_FIT_IMAGE_FDT_BOSTON) += img
> subdir-$(CONFIG_MACH_INGENIC) += ingenic
> subdir-$(CONFIG_LANTIQ) += lantiq
> subdir-$(CONFIG_MACH_LOONGSON64) += loongson
> +subdir-$(CONFIG_MACH_LOONGSON32) += loongson
> subdir-$(CONFIG_SOC_VCOREIII) += mscc
> subdir-$(CONFIG_MIPS_MALTA) += mti
> subdir-$(CONFIG_LEGACY_BOARD_SEAD3) += mti
> diff --git a/arch/mips/boot/dts/loongson/Makefile b/arch/mips/boot/dts/loongson/Makefile
> index 5e3ab984d70f..2facf251fb6a 100644
> --- a/arch/mips/boot/dts/loongson/Makefile
> +++ b/arch/mips/boot/dts/loongson/Makefile
> @@ -5,3 +5,9 @@ dtb-$(CONFIG_MACH_LOONGSON64) += loongson64c_4core_rs780e.dtb
> dtb-$(CONFIG_MACH_LOONGSON64) += loongson64c_8core_rs780e.dtb
> dtb-$(CONFIG_MACH_LOONGSON64) += loongson64g_4core_ls7a.dtb
> dtb-$(CONFIG_MACH_LOONGSON64) += loongson64v_4core_virtio.dtb
> +
> +ifneq ($(CONFIG_BUILTIN_DTB_NAME),)
> +dtb-y := $(addsuffix .dtb, $(CONFIG_BUILTIN_DTB_NAME))
> +else
This does not really look related to new board.
> +dtb-$(CONFIG_MACH_LOONGSON32) += ls1b-demo.dtb
> +endif
> diff --git a/arch/mips/boot/dts/loongson/loongson1.dtsi b/arch/mips/boot/dts/loongson/loongson1.dtsi
> new file mode 100644
> index 000000000000..5ba5a5d131ba
...
> + opp-220000000 {
> + opp-hz = /bits/ 64 <220000000>;
> + };
> + };
> +
> + clocksource: timer@1fe5c030 {
This should be in the SoC (see writing bindings, maintainer soc, DTS
coding style).
> + compatible = "loongson,ls1b-pwmtimer";
> + reg = <0x1fe5c030 0x10>;
> + clocks = <&clkc LS1X_CLKID_APB>;
> + interrupt-parent = <&intc0>;
> + interrupts = <20 IRQ_TYPE_LEVEL_HIGH>;
> + };
> +
> + clkc: clock-controller@1fe78030 {
> + compatible = "loongson,ls1b-clk";
> + reg = <0x1fe78030 0x8>;
> + clocks = <&xtal>;
> + #clock-cells = <1>;
> + };
> +};
> +
> +&soc {
> + syscon: syscon@420 {
> + compatible = "loongson,ls1b-syscon", "syscon";
> + reg = <0x420 0x8>;
> + };
> +
> + dma: dma-controller@1160 {
> + compatible = "loongson,ls1b-apbdma";
> + reg = <0x1160 0x4>;
> + interrupt-parent = <&intc0>;
> + interrupts = <13 IRQ_TYPE_EDGE_RISING>,
> + <14 IRQ_TYPE_EDGE_RISING>,
> + <15 IRQ_TYPE_EDGE_RISING>;
> + interrupt-names = "ch0", "ch1", "ch2";
> + #dma-cells = <1>;
> + };
> +
> + ehci: usb@100000 {
> + compatible = "generic-ehci";
> + reg = <0x100000 0x100>;
> + interrupt-parent = <&intc1>;
> + interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
> + status = "disabled";
> + };
> +
> + ohci: usb@108000 {
> + compatible = "generic-ohci";
> + reg = <0x108000 0x100>;
> + interrupt-parent = <&intc1>;
> + interrupts = <1 IRQ_TYPE_LEVEL_HIGH>;
> + status = "disabled";
> + };
> +
> + gmac0: ethernet@110000 {
> + compatible = "loongson,ls1b-gmac", "snps,dwmac-3.50a";
> + reg = <0x110000 0x10000>;
> + clocks = <&clkc LS1X_CLKID_AHB>;
> + clock-names = "stmmaceth";
> + interrupt-parent = <&intc1>;
> + interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
> + interrupt-names = "macirq";
> + loongson,ls1-syscon = <&syscon>;
> + snps,pbl = <1>;
> + status = "disabled";
> + };
> +
> + gmac1: ethernet@120000 {
> + compatible = "loongson,ls1b-gmac", "snps,dwmac-3.50a";
> + reg = <0x120000 0x10000>;
> + clocks = <&clkc LS1X_CLKID_AHB>;
> + clock-names = "stmmaceth";
> + interrupt-parent = <&intc1>;
> + interrupts = <3 IRQ_TYPE_LEVEL_HIGH>;
> + interrupt-names = "macirq";
> + loongson,ls1-syscon = <&syscon>;
> + snps,pbl = <1>;
> + status = "disabled";
> + };
> +};
> +
> +&apb {
> + watchdog: watchdog@1c060 {
> + compatible = "loongson,ls1b-wdt";
> + reg = <0x1c060 0xc>;
> + clocks = <&clkc LS1X_CLKID_APB>;
> + status = "disabled";
> + };
> +
> + rtc: rtc@24000 {
> + compatible = "loongson,ls1b-rtc";
> + reg = <0x24000 0x78>;
> + interrupt-parent = <&intc0>;
> + interrupts = <24 IRQ_TYPE_LEVEL_HIGH>;
> + status = "disabled";
> + };
> +
> + ac97: audio-controller@34000 {
> + compatible = "loongson,ls1b-ac97";
> + reg = <0x34000 0x60>, <0x32420 0x4>, <0x34c4c 0x4>;
> + reg-names = "ac97", "audio-tx", "audio-rx";
> + dmas = <&dma 1>, <&dma 2>;
> + dma-names = "tx", "rx";
> + #sound-dai-cells = <0>;
> + status = "disabled";
> + };
> +
> + nand: nand-controller@38000 {
> + compatible = "loongson,ls1b-nand-controller";
> + reg = <0x38000 0x24>, <0x38040 0x4>;
> + reg-names = "nand", "nand-dma";
> + dmas = <&dma 0>;
> + dma-names = "rxtx";
> + #address-cells = <1>;
> + #size-cells = <0>;
> + status = "disabled";
> +
> + nand@0 {
> + reg = <0>;
> + label = "ls1x-nand";
> + nand-use-soft-ecc-engine;
> + nand-ecc-algo = "hamming";
> + };
> + };
> +};
> +
> +&cpu0 {
> + operating-points-v2 = <&cpu_opp_table>;
> +};
> +
> +&gpio0 {
> + ngpios = <31>;
> +};
> +
> +&gpio1 {
> + ngpios = <30>;
> +};
> +
> +&uart1 {
> + interrupts = <3 IRQ_TYPE_LEVEL_HIGH>;
> +};
> +
> +&uart2 {
> + interrupts = <4 IRQ_TYPE_LEVEL_HIGH>;
> +};
> +
> +&uart3 {
> + interrupts = <5 IRQ_TYPE_LEVEL_HIGH>;
> +};
> diff --git a/arch/mips/boot/dts/loongson/ls1b-demo.dts b/arch/mips/boot/dts/loongson/ls1b-demo.dts
> new file mode 100644
> index 000000000000..19ea772e6649
> --- /dev/null
> +++ b/arch/mips/boot/dts/loongson/ls1b-demo.dts
> @@ -0,0 +1,108 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Copyright (c) 2023-2025 Keguang Zhang <keguang.zhang@gmail.com>
> + */
> +
> +/dts-v1/;
> +
> +#include <dt-bindings/gpio/gpio.h>
> +
> +#include "loongson1b.dtsi"
> +
> +/ {
> + compatible = "loongson,ls1b-demo", "loongson,ls1b";
> + model = "LS1B-DEMO Board";
> +
> + memory@0 {
> + device_type = "memory";
> + reg = <0x0 0x10000000>;
> + };
> +
> + aliases {
> + ethernet0 = &gmac0;
> + ethernet1 = &gmac1;
> + gpio0 = &gpio0;
> + gpio1 = &gpio1;
> + serial0 = &uart0;
> + };
> +
> + chosen {
> + bootargs = "console=ttyS0,38400";
Drop bootargs. You duplicate stdout path.
> + stdout-path = "serial0:38400n8";
> + };
Best regards,
Krzysztof
On Thu, Jul 10, 2025 at 8:27 PM Krzysztof Kozlowski <krzk@kernel.org> wrote:
>
> On Wed, Jul 09, 2025 at 07:05:54PM +0800, Keguang Zhang wrote:
> > Add a device tree for LS1B-DEMO board, supporting CPU, clock, INTC,
> > UART, Ethernet, GPIO, USB host, RTC, watchdog, DMA, NAND, and AC97.
> >
> > Additionally, since the current bootloader for Loongson1 does not support
> > FDT, introduce CONFIG_BUILTIN_DTB_NAME to enable a built-in DTB.
> >
> > Signed-off-by: Keguang Zhang <keguang.zhang@gmail.com>
> > ---
> > MAINTAINERS | 1 +
> > arch/mips/boot/dts/Makefile | 1 +
> > arch/mips/boot/dts/loongson/Makefile | 6 +
> > arch/mips/boot/dts/loongson/loongson1.dtsi | 136 +++++++++++++++++++
> > arch/mips/boot/dts/loongson/loongson1b.dtsi | 198 ++++++++++++++++++++++++++++
> > arch/mips/boot/dts/loongson/ls1b-demo.dts | 108 +++++++++++++++
> > 6 files changed, 450 insertions(+)
> >
> > diff --git a/MAINTAINERS b/MAINTAINERS
> > index c3f7fbd0d67a..0089ebca31cf 100644
> > --- a/MAINTAINERS
> > +++ b/MAINTAINERS
> > @@ -16683,6 +16683,7 @@ M: Keguang Zhang <keguang.zhang@gmail.com>
> > L: linux-mips@vger.kernel.org
> > S: Maintained
> > F: Documentation/devicetree/bindings/*/loongson,ls1*.yaml
> > +F: arch/mips/boot/dts/loongson/loongson1*
> > F: arch/mips/include/asm/mach-loongson32/
> > F: arch/mips/loongson32/
> > F: drivers/*/*loongson1*
> > diff --git a/arch/mips/boot/dts/Makefile b/arch/mips/boot/dts/Makefile
> > index 7375c6ced82b..6d9dbe945541 100644
> > --- a/arch/mips/boot/dts/Makefile
> > +++ b/arch/mips/boot/dts/Makefile
> > @@ -8,6 +8,7 @@ subdir-$(CONFIG_FIT_IMAGE_FDT_BOSTON) += img
> > subdir-$(CONFIG_MACH_INGENIC) += ingenic
> > subdir-$(CONFIG_LANTIQ) += lantiq
> > subdir-$(CONFIG_MACH_LOONGSON64) += loongson
> > +subdir-$(CONFIG_MACH_LOONGSON32) += loongson
> > subdir-$(CONFIG_SOC_VCOREIII) += mscc
> > subdir-$(CONFIG_MIPS_MALTA) += mti
> > subdir-$(CONFIG_LEGACY_BOARD_SEAD3) += mti
> > diff --git a/arch/mips/boot/dts/loongson/Makefile b/arch/mips/boot/dts/loongson/Makefile
> > index 5e3ab984d70f..2facf251fb6a 100644
> > --- a/arch/mips/boot/dts/loongson/Makefile
> > +++ b/arch/mips/boot/dts/loongson/Makefile
> > @@ -5,3 +5,9 @@ dtb-$(CONFIG_MACH_LOONGSON64) += loongson64c_4core_rs780e.dtb
> > dtb-$(CONFIG_MACH_LOONGSON64) += loongson64c_8core_rs780e.dtb
> > dtb-$(CONFIG_MACH_LOONGSON64) += loongson64g_4core_ls7a.dtb
> > dtb-$(CONFIG_MACH_LOONGSON64) += loongson64v_4core_virtio.dtb
> > +
> > +ifneq ($(CONFIG_BUILTIN_DTB_NAME),)
> > +dtb-y := $(addsuffix .dtb, $(CONFIG_BUILTIN_DTB_NAME))
> > +else
>
> This does not really look related to new board.
Will separate this into a single patch.
>
> > +dtb-$(CONFIG_MACH_LOONGSON32) += ls1b-demo.dtb
> > +endif
> > diff --git a/arch/mips/boot/dts/loongson/loongson1.dtsi b/arch/mips/boot/dts/loongson/loongson1.dtsi
> > new file mode 100644
> > index 000000000000..5ba5a5d131ba
>
> ...
>
> > + opp-220000000 {
> > + opp-hz = /bits/ 64 <220000000>;
> > + };
> > + };
> > +
> > + clocksource: timer@1fe5c030 {
>
> This should be in the SoC (see writing bindings, maintainer soc, DTS
> coding style).
Will move it under the APB bus.
>
> > + compatible = "loongson,ls1b-pwmtimer";
> > + reg = <0x1fe5c030 0x10>;
> > + clocks = <&clkc LS1X_CLKID_APB>;
> > + interrupt-parent = <&intc0>;
> > + interrupts = <20 IRQ_TYPE_LEVEL_HIGH>;
> > + };
> > +
> > + clkc: clock-controller@1fe78030 {
> > + compatible = "loongson,ls1b-clk";
> > + reg = <0x1fe78030 0x8>;
> > + clocks = <&xtal>;
> > + #clock-cells = <1>;
> > + };
> > +};
> > +
> > +&soc {
> > + syscon: syscon@420 {
> > + compatible = "loongson,ls1b-syscon", "syscon";
> > + reg = <0x420 0x8>;
> > + };
> > +
> > + dma: dma-controller@1160 {
> > + compatible = "loongson,ls1b-apbdma";
> > + reg = <0x1160 0x4>;
> > + interrupt-parent = <&intc0>;
> > + interrupts = <13 IRQ_TYPE_EDGE_RISING>,
> > + <14 IRQ_TYPE_EDGE_RISING>,
> > + <15 IRQ_TYPE_EDGE_RISING>;
> > + interrupt-names = "ch0", "ch1", "ch2";
> > + #dma-cells = <1>;
> > + };
> > +
> > + ehci: usb@100000 {
> > + compatible = "generic-ehci";
> > + reg = <0x100000 0x100>;
> > + interrupt-parent = <&intc1>;
> > + interrupts = <0 IRQ_TYPE_LEVEL_HIGH>;
> > + status = "disabled";
> > + };
> > +
> > + ohci: usb@108000 {
> > + compatible = "generic-ohci";
> > + reg = <0x108000 0x100>;
> > + interrupt-parent = <&intc1>;
> > + interrupts = <1 IRQ_TYPE_LEVEL_HIGH>;
> > + status = "disabled";
> > + };
> > +
> > + gmac0: ethernet@110000 {
> > + compatible = "loongson,ls1b-gmac", "snps,dwmac-3.50a";
> > + reg = <0x110000 0x10000>;
> > + clocks = <&clkc LS1X_CLKID_AHB>;
> > + clock-names = "stmmaceth";
> > + interrupt-parent = <&intc1>;
> > + interrupts = <2 IRQ_TYPE_LEVEL_HIGH>;
> > + interrupt-names = "macirq";
> > + loongson,ls1-syscon = <&syscon>;
> > + snps,pbl = <1>;
> > + status = "disabled";
> > + };
> > +
> > + gmac1: ethernet@120000 {
> > + compatible = "loongson,ls1b-gmac", "snps,dwmac-3.50a";
> > + reg = <0x120000 0x10000>;
> > + clocks = <&clkc LS1X_CLKID_AHB>;
> > + clock-names = "stmmaceth";
> > + interrupt-parent = <&intc1>;
> > + interrupts = <3 IRQ_TYPE_LEVEL_HIGH>;
> > + interrupt-names = "macirq";
> > + loongson,ls1-syscon = <&syscon>;
> > + snps,pbl = <1>;
> > + status = "disabled";
> > + };
> > +};
> > +
> > +&apb {
> > + watchdog: watchdog@1c060 {
> > + compatible = "loongson,ls1b-wdt";
> > + reg = <0x1c060 0xc>;
> > + clocks = <&clkc LS1X_CLKID_APB>;
> > + status = "disabled";
> > + };
> > +
> > + rtc: rtc@24000 {
> > + compatible = "loongson,ls1b-rtc";
> > + reg = <0x24000 0x78>;
> > + interrupt-parent = <&intc0>;
> > + interrupts = <24 IRQ_TYPE_LEVEL_HIGH>;
> > + status = "disabled";
> > + };
> > +
> > + ac97: audio-controller@34000 {
> > + compatible = "loongson,ls1b-ac97";
> > + reg = <0x34000 0x60>, <0x32420 0x4>, <0x34c4c 0x4>;
> > + reg-names = "ac97", "audio-tx", "audio-rx";
> > + dmas = <&dma 1>, <&dma 2>;
> > + dma-names = "tx", "rx";
> > + #sound-dai-cells = <0>;
> > + status = "disabled";
> > + };
> > +
> > + nand: nand-controller@38000 {
> > + compatible = "loongson,ls1b-nand-controller";
> > + reg = <0x38000 0x24>, <0x38040 0x4>;
> > + reg-names = "nand", "nand-dma";
> > + dmas = <&dma 0>;
> > + dma-names = "rxtx";
> > + #address-cells = <1>;
> > + #size-cells = <0>;
> > + status = "disabled";
> > +
> > + nand@0 {
> > + reg = <0>;
> > + label = "ls1x-nand";
> > + nand-use-soft-ecc-engine;
> > + nand-ecc-algo = "hamming";
> > + };
> > + };
> > +};
> > +
> > +&cpu0 {
> > + operating-points-v2 = <&cpu_opp_table>;
> > +};
> > +
> > +&gpio0 {
> > + ngpios = <31>;
> > +};
> > +
> > +&gpio1 {
> > + ngpios = <30>;
> > +};
> > +
> > +&uart1 {
> > + interrupts = <3 IRQ_TYPE_LEVEL_HIGH>;
> > +};
> > +
> > +&uart2 {
> > + interrupts = <4 IRQ_TYPE_LEVEL_HIGH>;
> > +};
> > +
> > +&uart3 {
> > + interrupts = <5 IRQ_TYPE_LEVEL_HIGH>;
> > +};
> > diff --git a/arch/mips/boot/dts/loongson/ls1b-demo.dts b/arch/mips/boot/dts/loongson/ls1b-demo.dts
> > new file mode 100644
> > index 000000000000..19ea772e6649
> > --- /dev/null
> > +++ b/arch/mips/boot/dts/loongson/ls1b-demo.dts
> > @@ -0,0 +1,108 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * Copyright (c) 2023-2025 Keguang Zhang <keguang.zhang@gmail.com>
> > + */
> > +
> > +/dts-v1/;
> > +
> > +#include <dt-bindings/gpio/gpio.h>
> > +
> > +#include "loongson1b.dtsi"
> > +
> > +/ {
> > + compatible = "loongson,ls1b-demo", "loongson,ls1b";
> > + model = "LS1B-DEMO Board";
> > +
> > + memory@0 {
> > + device_type = "memory";
> > + reg = <0x0 0x10000000>;
> > + };
> > +
> > + aliases {
> > + ethernet0 = &gmac0;
> > + ethernet1 = &gmac1;
> > + gpio0 = &gpio0;
> > + gpio1 = &gpio1;
> > + serial0 = &uart0;
> > + };
> > +
> > + chosen {
> > + bootargs = "console=ttyS0,38400";
>
> Drop bootargs. You duplicate stdout path.
Will do.
Thanks for the review!
>
> > + stdout-path = "serial0:38400n8";
> > + };
>
> Best regards,
> Krzysztof
>
--
Best regards,
Keguang Zhang
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