[PATCH v4 0/7] LoongArch: Add built-in dtb support

[Binbin Zhou <zhoubinbin@loongson.cn>]

Hi all:

This patchset introduces LoongArch's built-in dtb support.

As we know, the Loongson-2K family supports DT. Inevitably, some systems
do not provide a useful device tree to the kernel at boot time. Chasing
around bootloaders for these systems is a headache, so we just keep a
device tree table in the kernel, keyed by the dts filename, that
contains the relevant DTBs.

Thanks.

-----
V4:
patch(1/7):
  - Drop device_type property.
patch(2/7):
  - Rename board.yaml to loongson.yaml.
patch(4/7):
  - Keep the ranges attribute after compatible;
  - Add bootargs = "ttyS0,115200", which is needed for reference board;
patch(5/7):
  - Keep the ranges attribute after compatible;
  - Add bootargs = "ttyS0,115200", which is needed for reference board;
  - Change node name global-utilities to chipid.
patch(6/7):
  - Keep the ranges attribute after compatible;
  - Add bootargs = "ttyS0,115200", which is needed for reference board.

Link to V3:
https://lore.kernel.org/all/cover.1692618548.git.zhoubinbin@loongson.cn/

V3:
patch(1/7):
  - Add reference to the common cpu schema.
patch(2/7):
  - Add reviewed-by tag.
patch(4/7):
  - Drop bootargs;
  - Move the cpus node to dtsi, which is part of the SoC.
patch(5/7):
  - Drop bootargs;
  - Move the cpus node to dtsi, which is part of the SoC;
  - Fix gmac0/1-mdio node: compatible is always the first property;
  - Drop i2c-gpio node.
patch(6/7):
  - Drop bootargs;
  - Move the cpus node to dtsi, which is part of the SoC.
  - Changes liointc to liointc-1.0, for Loongson-2K2000 has 32 interrupt
    sources.

Link to V2:
https://lore.kernel.org/all/cover.1692088166.git.zhoubinbin@loongson.cn/

V2:
patch(1/7):
  - Drop model and clock-frequency properties;
  - Add clocks property;
  - Rewrite the description.
patch(2/7):
  - Add the proper compatibles for boards.
patch(4/7)(5/7)(6/7):
  - Format commit message head;
  - Drop undocumented compatible, such as pci_bridge compatible;
  - Distinguish the attributes, put SoC-related into DTSI and
    board-related into DTS;
  - Check DTS with 'make dtbs_check W=1'.
patch(7/7)
  - New patch;
  - Parses Molde name and CPU MHz from the DTS attribute.

Link to V1:
https://lore.kernel.org/loongarch/cover.1686882123.git.zhoubinbin@loongson.cn/

Binbin Zhou (7):
  dt-bindings: loongarch: Add CPU bindings for LoongArch
  dt-bindings: loongarch: Add Loongson SoC boards compatibles
  LoongArch: Allow device trees to be built into the kernel
  LoongArch: dts: DeviceTree for Loongson-2K0500
  LoongArch: dts: DeviceTree for Loongson-2K1000
  LoongArch: dts: DeviceTree for Loongson-2K2000
  LoongArch: Parsing CPU-related information from DTS

 .../devicetree/bindings/loongarch/cpus.yaml   |  61 +++
 .../bindings/loongarch/loongson.yaml          |  34 ++
 arch/loongarch/Kconfig                        |  16 +
 arch/loongarch/Makefile                       |  10 +-
 arch/loongarch/boot/dts/Makefile              |   7 +-
 .../boot/dts/loongson-2k0500-ref.dts          |  89 ++++
 arch/loongarch/boot/dts/loongson-2k0500.dtsi  | 254 +++++++++++
 .../boot/dts/loongson-2k1000-ref.dts          | 172 ++++++++
 arch/loongarch/boot/dts/loongson-2k1000.dtsi  | 397 ++++++++++++++++++
 .../boot/dts/loongson-2k2000-ref.dts          |  73 ++++
 arch/loongarch/boot/dts/loongson-2k2000.dtsi  | 291 +++++++++++++
 arch/loongarch/kernel/env.c                   |  33 ++
 arch/loongarch/kernel/setup.c                 |   9 +-
 13 files changed, 1440 insertions(+), 6 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/loongarch/cpus.yaml
 create mode 100644 Documentation/devicetree/bindings/loongarch/loongson.yaml
 create mode 100644 arch/loongarch/boot/dts/loongson-2k0500-ref.dts
 create mode 100644 arch/loongarch/boot/dts/loongson-2k0500.dtsi
 create mode 100644 arch/loongarch/boot/dts/loongson-2k1000-ref.dts
 create mode 100644 arch/loongarch/boot/dts/loongson-2k1000.dtsi
 create mode 100644 arch/loongarch/boot/dts/loongson-2k2000-ref.dts
 create mode 100644 arch/loongarch/boot/dts/loongson-2k2000.dtsi

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2.39.3