> -----Original Message-----
> From: Yubin Zou <yubinz@google.com>
> Sent: Friday, December 19, 2025 3:04 PM
> To: qemu-devel@nongnu.org
> Cc: Cédric Le Goater <clg@kaod.org>; Peter Maydell
> <peter.maydell@linaro.org>; Steven Lee <steven_lee@aspeedtech.com>; Troy
> Lee <leetroy@gmail.com>; Jamin Lin <jamin_lin@aspeedtech.com>; Andrew
> Jeffery <andrew@codeconstruct.com.au>; Joel Stanley <joel@jms.id.au>;
> Fabiano Rosas <farosas@suse.de>; Laurent Vivier <lvivier@redhat.com>;
> Paolo Bonzini <pbonzini@redhat.com>; Kane Chen
> <kane_chen@aspeedtech.com>; Nabih Estefan <nabihestefan@google.com>;
> qemu-arm@nongnu.org; Yubin Zou <yubinz@google.com>; Cédric Le Goater
> <clg@redhat.com>
> Subject: [PATCH v5 0/6] hw/gpio/aspeed_sgpio: Add Aspeed Serial GPIO
> (SGPIO) controller model
> 
> This series introduces a model for the Aspeed Serial GPIO (SGPIO) controller,
> commonly found on Aspeed SoCs such as the AST2700. The SGPIO peripheral
> provides a large number of GPIO pins that can be controlled and monitored
> serially.
> 
> Improvement to QEMU:
> These patches enhance QEMU's hardware emulation capabilities for platforms
> using Aspeed SoCs, particularly for BMC simulations. By modeling the SGPIO
> controller, QEMU can more accurately represent the hardware, allowing for
> better development and testing of firmware and software that relies on these
> GPIOs for various functions like sensor monitoring, presence detect, and
> system control signals.
> 
> Impact (Before/After):
> 
> Before:
> QEMU lacked a model for the Aspeed SGPIO controller. Any guest software
> attempting to interact with the SGPIO register space would find no device.
> Firmware features depending on SGPIO pin states or interrupts could not be
> tested in QEMU.
> 
> After:
> QEMU emulates the Aspeed SGPIO controller on supported machines (e.g.,
> ast2700-evb).
> - Guest firmware can configure SGPIO pins, set output values, and read input
>   values through the memory-mapped registers.
> - External entities (like test scripts or other QEMU components) can interact
>   with the pins via QOM properties (e.g., to simulate external signal changes).
>   Path example: /machine/soc/sgpio[0]/sgpio0
> - The model generates interrupts based on input pin transitions, according to
>   the configured mode (level/edge), enabling testing of interrupt handlers.
> 
> Signed-off-by: Yubin Zou <yubinz@google.com>
> ---
> Changes in v5:
> - Fix logging, typo and indentation in 1/6.
> - Fix typo and empty line in 3/6.
> - Fix duplicate definition in 6/6.
> - Link to v4:
> https://lore.kernel.org/qemu-devel/20251217-aspeed-sgpio-v4-0-28bbb8dca
> b30@google.com
> 
> Changes in v4:
> - Fix indentation issue, replace SysBusDevice by SysBusDeviceClass,
>   remove unused function in 1/6.
> - Fix g_autofree usage in 2/6.
> - Switch to use  %03d in unit test, remove unused headers in 6/6.
> - Link to v3:
> https://lore.kernel.org/qemu-devel/20251210-aspeed-sgpio-v3-0-eb8b0cf3dd
> 51@google.com
> 
> Changes in v3:
> - Fix commit message typo and address several review feedback in
>   commit 2/6.
> - Switch to use g_autofree and drop g_free.
> - Use "%03d" instead of "%d".
> - Link to v2:
> https://lore.kernel.org/qemu-devel/20251209-aspeed-sgpio-v2-0-976e5f5790
> c2@google.com
> 
> Changes in v2:
> Split the v1 into smaller commits and reorder it for better review:
> - Link to v1:
> https://lore.kernel.org/qemu-devel/20251106-aspeed-sgpio-v1-0-b02609371
> 6fa@google.com
> 
> ---
> Yubin Zou (6):
>       hw/gpio/aspeed_sgpio: Add basic device model for Aspeed SGPIO
>       hw/gpio/aspeed_sgpio: Add QOM property accessors for SGPIO pins
>       hw/gpio/aspeed_sgpio: Implement SGPIO interrupt handling
>       hw/arm/aspeed_soc: Update Aspeed SoC to support two SGPIO
> controllers
>       hw/arm/aspeed_ast27x0: Wire SGPIO controller to AST2700 SoC
>       test/qtest: Add Unit test for Aspeed SGPIO
> 
>  include/hw/arm/aspeed_soc.h      |   8 +-
>  include/hw/gpio/aspeed_sgpio.h   |  68 ++++++++
>  hw/arm/aspeed_ast10x0.c          |   6 +-
>  hw/arm/aspeed_ast27x0.c          |  26 +++
>  hw/gpio/aspeed_sgpio.c           | 346
> +++++++++++++++++++++++++++++++++++++++
>  tests/qtest/ast2700-sgpio-test.c | 165 +++++++++++++++++++
>  hw/gpio/meson.build              |   1 +
>  tests/qtest/meson.build          |   1 +
>  8 files changed, 616 insertions(+), 5 deletions(-)
> ---
> base-commit: 917ac07f9aef579b9538a81d45f45850aba42906
> change-id: 20251105-aspeed-sgpio-1d49de6cea66
> 
> Best regards,
> --
> Yubin Zou <yubinz@google.com>

Hi Yubin,

Thank you for the SGPIO code changes. The patch series looks good.
Let's wait for further feedback from Cédric or the other maintainers.

Best Regards,
Kane