Kane, Jamin, For some reason, I don't receive your proposals anymore. My provider seems to drop silently these emails. Have you changed anything recently ?
Thanks, C. On 1/20/26 06:18, Kane Chen via qemu development wrote:
From: Kane-Chen-AS <[email protected]> Hi all, LTPI (LVDS Tunneling Protocol & Interface) is defined in the OCP DC-SCM 2.0 specification (see Figure 2): https://www.opencompute.org/documents/ocp-dc-scm-2-0-ltpi-ver-1-0-pdf LTPI provides a protocol and physical interface for tunneling various low-speed signals between the Host Processor Module (HPM) and the Satellite Controller Module (SCM). In Figure 2 of the specification, the AST27x0 SoC (left) integrates two LTPI controllers, allowing it to connect to up to two AST1700 boards. On the other side, the AST1700 consolidates HPM FPGA functions and multiple peripheral interfaces (GPIO, UART, I2C, I3C, etc.) onto a single board. Because the AST1700 exposes additional I/O interfaces (GPIO, I2C, I3C, and others), it acts as an I/O expander. Once connected over LTPI, the AST27x0 can control additional downstream devices through this link. This patch series is based on the aspeed_next branch and incorporates recent I2C bus label changes. Ref: https://patchwork.kernel.org/project/qemu-devel/patch/[email protected]/ It introduces a basic LTPI controller model and wires it into the AST27x0 SoC. The series also adds the AST1700-specific LTPI expander device and incrementally connects common peripherals on the AST1700 model. For the I3C block, which may cause kernel crashes, its MMIO region is modeled as an unimplemented device to reserve address space and make the missing functionality explicit, ensuring stable guest probing. In the official release images, the AST1700 functions are not included by default. To test the AST1700-related functionality, please include the following DTS files for probing: https://github.com/AspeedTech-BMC/linux/blob/aspeed-master-v6.6/arch/arm64/boot/dts/aspeed/aspeed-ltpi0.dtsi https://github.com/AspeedTech-BMC/linux/blob/aspeed-master-v6.6/arch/arm64/boot/dts/aspeed/aspeed-ltpi1.dtsi After including these DTS files in the BMC image, you can verify LTPI functionality using the following scenarios: 1. In U-Boot: Run the ltpi command to trigger the LTPI connection and display the current connection status. 2. In BMC Linux: Run i2cdetect -y <16-38> to scan and test the I2C buses exposed by the AST1700. Any feedback or suggestions are appreciated! Kane --- ChangeLog --------- v5: - Add functional test case for AST1700 I2C - Corrected the From attribution - Fixed incorrect DRAM setting for SPI and I2C controllers - Refine code structure v4: - Add missing Signed-off-by - Fix checkpatch.pl warnings - Refine code structure - Enable AST1700 support only after all devices are ready v3: - Add PWM model - Integrate the SGPIO model - Fix I2C test case failure - Refine code structure v2: - Separate the AST1700 model into a standalone implementation - Refine the mechanism for assigning the AST1700 board number v1: - Initial version --- Cédric Le Goater (1): hw/misc: Add basic Aspeed PWM model Kane-Chen-AS (21): hw/misc: Add LTPI controller hw/arm/aspeed: Attach LTPI controller to AST27X0 platform hw/arm/aspeed: Add AST1700 LTPI expander device model hw/arm/aspeed: Integrate AST1700 device into AST27X0 hw/arm/aspeed: Integrate interrupt controller for AST1700 hw/arm/aspeed: Attach LTPI controller to AST1700 model hw/arm/aspeed: Attach UART device to AST1700 model hw/arm/aspeed: Attach SRAM device to AST1700 model hw/arm/aspeed: Attach SPI device to AST1700 model hw/arm/aspeed: Attach ADC device to AST1700 model hw/arm/aspeed: Attach SCU device to AST1700 model hw/arm/aspeed: Attach GPIO device to AST1700 model hw/arm/aspeed: Introduce 'bus-label' property for AST1700 SoC hw/arm/aspeed: attach I2C device to AST1700 model hw/arm/aspeed: Attach WDT device to AST1700 model hw/arm/aspeed: Attach PWM device to AST1700 model hw/arm/aspeed: Attach SGPIOM device to AST1700 model hw/arm/aspeed: Model AST1700 I3C block as unimplemented device hw/arm/aspeed: Enable AST1700 IO expander support test/functional/aarch64: Parameterize I2C bus ID in AST2700 test test/functional/aarch64: Add I2C test for AST1700 IO expanders include/hw/arm/aspeed_ast1700.h | 55 ++++ include/hw/arm/aspeed_soc.h | 25 +- include/hw/intc/aspeed_intc.h | 2 + include/hw/misc/aspeed_ltpi.h | 33 +++ include/hw/misc/aspeed_pwm.h | 31 ++ hw/arm/aspeed_ast1700.c | 280 ++++++++++++++++++ hw/arm/aspeed_ast27x0.c | 170 ++++++++++- hw/intc/aspeed_intc.c | 60 ++++ hw/misc/aspeed_ltpi.c | 193 ++++++++++++ hw/misc/aspeed_pwm.c | 121 ++++++++ hw/arm/meson.build | 1 + hw/misc/meson.build | 2 + hw/misc/trace-events | 4 + .../functional/aarch64/test_aspeed_ast2700.py | 52 +++- 14 files changed, 999 insertions(+), 30 deletions(-) create mode 100644 include/hw/arm/aspeed_ast1700.h create mode 100644 include/hw/misc/aspeed_ltpi.h create mode 100644 include/hw/misc/aspeed_pwm.h create mode 100644 hw/arm/aspeed_ast1700.c create mode 100644 hw/misc/aspeed_ltpi.c create mode 100644 hw/misc/aspeed_pwm.c
