Re: [PATCH v9] ptp: ocp: add CPLD ISP support for ADVA TimeCard X1

[Vadim Fedorenko <vadim.fedorenko@linux.dev>]

On 03/08/2026 15:28, Sagi Maimon wrote:
> The ADVA TimeCard X1 (PCI device 0x0410) uses a Lattice MachXO3 CPLD
> that is programmed over I2C using in-system programming (ISP).
> 
> The CPLD is connected to a secondary I2C bus shared with the onboard
> MicroBlaze soft CPU.
> 
> Add support for CPLD access and firmware updates on the ADVA TimeCard X1
> board by arbitration of the shared I2C bus, CPLD ISP command handling,
> status polling, and firmware upload operations using the firmware-upload
> subsystem.
> 
> Add the following X1-only user-visible interfaces:
> 
>    /sys/class/timecard/ocpN/cpld_device_id
>          report the 32-bit Lattice MachXO3 CPLD device ID
> 
>    /sys/class/timecard/ocpN/cpld_status
>          report the CPLD status register, including the DONE,
>          BUSY, and FAILED indicators
> 
> Firmware updates are performed through the firmware-upload framework,
> which acquires ownership of the shared I2C bus, erases the CPLD
> configuration flash, programs the image page-by-page, and activates
> the new image using the MachXO3 REFRESH command.
> 
> All CPLD operations are serialized and coordinated with the MicroBlaze
> firmware to ensure exclusive access to the shared I2C bus. The added
> interfaces are available only on ADVA TimeCard X1 boards.
> 
> Signed-off-by: Sagi Maimon <maimon.sagi@gmail.com>
> ---
>   
>   Changes since v8:
>   - Use dedicated MicroBlaze handshake values instead of 0xffffffff,
>     which may be returned by failed PCI reads.

Please, combine it with comments on v8

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