[PATCH RFC 10/12] riscv: dts: bouffalolab: Add Sipeed M1s Dock

[Kwanghoon Son]

Add the M1s SoM memory and 40 MHz crystal, and enable UART3 on the Dock
with a direct stdout path and 115200 8N1 settings.

Boot firmware initializes PSRAM, UART pads and shared PLLs. The tested
firmware configures D0 TIME at 320 MHz / 380, represented as 842105 Hz.
Firmware using another timer configuration must fix up timebase-
frequency. The declared 64 MiB PSRAM range must retain firmware
reservations or be narrowed by firmware when memory is assigned to
another core.

The stdout path selects the native polling printk console; userspace TTY
I/O is deferred.

Signed-off-by: Kwanghoon Son <asdfkwang@xxxxxxxxx>
---
 arch/riscv/boot/dts/Makefile                          |  1 +
 arch/riscv/boot/dts/bouffalolab/Makefile              |  2 ++
 .../boot/dts/bouffalolab/bl808-sipeed-m1s-dock.dts    | 18 ++++++++++++++++++
 arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s.dtsi | 19 +++++++++++++++++++
 4 files changed, 40 insertions(+)

diff --git a/arch/riscv/boot/dts/Makefile b/arch/riscv/boot/dts/Makefile
index 69d8751fb17c803f0efb8003e111ee24144c222b..294f9c119f8f1d608c878ca1f95891843301f07e 100644
--- a/arch/riscv/boot/dts/Makefile
+++ b/arch/riscv/boot/dts/Makefile
@@ -2,6 +2,7 @@
 subdir-y += allwinner
 subdir-y += andes
 subdir-y += anlogic
+subdir-y += bouffalolab
 subdir-y += canaan
 subdir-y += eswin
 subdir-y += microchip
diff --git a/arch/riscv/boot/dts/bouffalolab/Makefile b/arch/riscv/boot/dts/bouffalolab/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..4d63365edc095fbe9df31c4b12e29c4b624cbd1f
--- /dev/null
+++ b/arch/riscv/boot/dts/bouffalolab/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+dtb-$(CONFIG_ARCH_BOUFFALOLAB) += bl808-sipeed-m1s-dock.dtb
diff --git a/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s-dock.dts b/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s-dock.dts
new file mode 100644
index 0000000000000000000000000000000000000000..c719a53c6e2de45f3718b48ba2116e99c70e559b
--- /dev/null
+++ b/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s-dock.dts
@@ -0,0 +1,18 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+/dts-v1/;
+
+#include "bl808-sipeed-m1s.dtsi"
+
+/ {
+	model = "Sipeed M1s Dock";
+	compatible = "sipeed,m1s-dock", "sipeed,m1s", "bflb,bl808";
+
+	chosen {
+		stdout-path = "/soc/serial@30002000:115200n8";
+	};
+};
+
+&uart3 {
+	status = "okay";
+};
diff --git a/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s.dtsi b/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s.dtsi
new file mode 100644
index 0000000000000000000000000000000000000000..ae54e6e301ed2c5a1448d52c530c5074515ee38c
--- /dev/null
+++ b/arch/riscv/boot/dts/bouffalolab/bl808-sipeed-m1s.dtsi
@@ -0,0 +1,19 @@
+// SPDX-License-Identifier: (GPL-2.0+ OR MIT)
+
+#include "bl808.dtsi"
+
+/ {
+	compatible = "sipeed,m1s", "bflb,bl808";
+	memory@50000000 {
+		device_type = "memory";
+		reg = <0x50000000 0x04000000>;
+	};
+
+	cpus {
+		timebase-frequency = <842105>;
+	};
+};
+
+&xtal {
+	clock-frequency = <40000000>;
+};

-- 
2.47.3