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Message-Id: <20240618-boston-syscon-v3-8-c47c06647a26@flygoat.com>
Date: Tue, 18 Jun 2024 16:11:08 +0100
From: Jiaxun Yang <jiaxun.yang@...goat.com>
To: Lee Jones <lee@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>, Paul Burton <paulburton@...nel.org>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Cc: devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-mips@...r.kernel.org, Jiaxun Yang <jiaxun.yang@...goat.com>
Subject: [PATCH v3 8/8] dt-bindings: mips: img: Add devices binding
Add devices binding for various Imagination Technologies
MIPS based Platforms.
Remove old documents.
Signed-off-by: Jiaxun Yang <jiaxun.yang@...goat.com>
---
v3: Remove old bindings, they are not relavant any more.
Booting protocol stuff is covered by spec.
---
.../devicetree/bindings/mips/img/devices.yaml | 33 +++++++++
.../bindings/mips/img/pistachio-marduk.txt | 10 ---
.../devicetree/bindings/mips/img/pistachio.txt | 42 -----------
.../devicetree/bindings/mips/img/xilfpga.txt | 83 ----------------------
4 files changed, 33 insertions(+), 135 deletions(-)
diff --git a/Documentation/devicetree/bindings/mips/img/devices.yaml b/Documentation/devicetree/bindings/mips/img/devices.yaml
new file mode 100644
index 000000000000..460ca96577ad
--- /dev/null
+++ b/Documentation/devicetree/bindings/mips/img/devices.yaml
@@ -0,0 +1,33 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/mips/img/devices.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Imagination Technologies MIPS based Platforms
+
+maintainers:
+ - Jiaxun Yang <jiaxun.yang@...goat.com>
+
+properties:
+ $nodename:
+ const: '/'
+ compatible:
+ oneOf:
+
+ - description: IMG Boston
+ const: img,boston
+
+ - description: IMG Marduk (Creator Ci40)
+ items:
+ - const: img,pistachio-marduk
+ - const: img,pistachio
+
+ - description: Imagination University Program MIPSfpga
+ items:
+ - const: img,xilfpga
+ - const: digilent,nexys4ddr
+
+additionalProperties: true
+
+...
diff --git a/Documentation/devicetree/bindings/mips/img/pistachio-marduk.txt b/Documentation/devicetree/bindings/mips/img/pistachio-marduk.txt
deleted file mode 100644
index 2d5126d529a2..000000000000
--- a/Documentation/devicetree/bindings/mips/img/pistachio-marduk.txt
+++ /dev/null
@@ -1,10 +0,0 @@
-Imagination Technologies' Pistachio SoC based Marduk Board
-==========================================================
-
-Compatible string must be "img,pistachio-marduk", "img,pistachio"
-
-Hardware and other related documentation is available at
-https://docs.creatordev.io/ci40/
-
-It is also known as Creator Ci40. Marduk is legacy name and will
-be there for decades.
diff --git a/Documentation/devicetree/bindings/mips/img/pistachio.txt b/Documentation/devicetree/bindings/mips/img/pistachio.txt
deleted file mode 100644
index a736d889c2b8..000000000000
--- a/Documentation/devicetree/bindings/mips/img/pistachio.txt
+++ /dev/null
@@ -1,42 +0,0 @@
-Imagination Pistachio SoC
-=========================
-
-Required properties:
---------------------
- - compatible: Must include "img,pistachio".
-
-CPU nodes:
-----------
-A "cpus" node is required. Required properties:
- - #address-cells: Must be 1.
- - #size-cells: Must be 0.
-A CPU sub-node is also required for at least CPU 0. Since the topology may
-be probed via CPS, it is not necessary to specify secondary CPUs. Required
-propertis:
- - device_type: Must be "cpu".
- - compatible: Must be "mti,interaptiv".
- - reg: CPU number.
- - clocks: Must include the CPU clock. See ../../clock/clock-bindings.txt for
- details on clock bindings.
-Example:
- cpus {
- #address-cells = <1>;
- #size-cells = <0>;
-
- cpu0: cpu@0 {
- device_type = "cpu";
- compatible = "mti,interaptiv";
- reg = <0>;
- clocks = <&clk_core CLK_MIPS>;
- };
- };
-
-
-Boot protocol:
---------------
-In accordance with the MIPS UHI specification[1], the bootloader must pass the
-following arguments to the kernel:
- - $a0: -2.
- - $a1: KSEG0 address of the flattened device-tree blob.
-
-[1] http://prplfoundation.org/wiki/MIPS_documentation
diff --git a/Documentation/devicetree/bindings/mips/img/xilfpga.txt b/Documentation/devicetree/bindings/mips/img/xilfpga.txt
deleted file mode 100644
index 57e7ee942166..000000000000
--- a/Documentation/devicetree/bindings/mips/img/xilfpga.txt
+++ /dev/null
@@ -1,83 +0,0 @@
-Imagination University Program MIPSfpga
-=======================================
-
-Under the Imagination University Program, a microAptiv UP core has been
-released for academic usage.
-
-As we are dealing with a MIPS core instantiated on an FPGA, specifications
-are fluid and can be varied in RTL.
-
-This binding document is provided as baseline guidance for the example
-project provided by IMG.
-
-The example project runs on the Nexys4DDR board by Digilent powered by
-the ARTIX-7 FPGA by Xilinx.
-
-Relevant details about the example project and the Nexys4DDR board:
-
-- microAptiv UP core m14Kc
-- 50MHz clock speed
-- 128Mbyte DDR RAM at 0x0000_0000
-- 8Kbyte RAM at 0x1000_0000
-- axi_intc at 0x1020_0000
-- axi_uart16550 at 0x1040_0000
-- axi_gpio at 0x1060_0000
-- axi_i2c at 0x10A0_0000
-- custom_gpio at 0x10C0_0000
-- axi_ethernetlite at 0x10E0_0000
-- 8Kbyte BootRAM at 0x1FC0_0000
-
-Required properties:
---------------------
- - compatible: Must include "digilent,nexys4ddr","img,xilfpga".
-
-CPU nodes:
-----------
-A "cpus" node is required. Required properties:
- - #address-cells: Must be 1.
- - #size-cells: Must be 0.
-A CPU sub-node is also required for at least CPU 0. Required properties:
- - device_type: Must be "cpu".
- - compatible: Must be "mips,m14Kc".
- - reg: Must be <0>.
- - clocks: phandle to ext clock for fixed-clock received by MIPS core.
-
-Example:
-
- compatible = "img,xilfpga","digilent,nexys4ddr";
- cpus {
- #address-cells = <1>;
- #size-cells = <0>;
-
- cpu0: cpu@0 {
- device_type = "cpu";
- compatible = "mips,m14Kc";
- reg = <0>;
- clocks = <&ext>;
- };
- };
-
- ext: ext {
- compatible = "fixed-clock";
- #clock-cells = <0>;
- clock-frequency = <50000000>;
- };
-
-Boot protocol:
---------------
-
-The BootRAM is a writeable "RAM" in FPGA at 0x1FC0_0000.
-This is for easy reprogrammibility via JTAG.
-
-The BootRAM initializes the cache and the axi_uart peripheral.
-
-DDR initialization is already handled by a HW IP block.
-
-When the example project bitstream is loaded, the cpu_reset button
-needs to be pressed.
-
-The bootram initializes the cache and axi_uart.
-Then outputs MIPSFPGA\n\r on the serial port on the Nexys4DDR board.
-
-At this point, the board is ready to load the Linux kernel
-vmlinux file via JTAG.
--
2.43.0
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