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Revert "Documentation: ABI: add sysfs interface for ZynqMP CSU registers"

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This reverts commit 8ebebccf15, which was
merged by accident.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann 2026-06-15 13:41:02 +02:00
parent 3659b13199
commit 218462fb8e
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33
Documentation/ABI/stable/sysfs-driver-firmware-zynqmp
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@ -254,36 +254,3 @@ Description:
The expected result is 500.
Users: Xilinx
What: /sys/devices/platform/firmware\:zynqmp-firmware/csu_registers/*
Date: May 2026
KernelVersion: 7.2
Contact: "Ronak Jain" <ronak.jain@amd.com>
Description:
Read/Write CSU (Configuration Security Unit) registers.
This interface provides dynamic access to CSU registers that are
discovered from the firmware at boot time using PM_QUERY_DATA API.
The supported registers are:
- multiboot: CSU_MULTI_BOOT register
- idcode: CSU_IDCODE register (read-only)
- pcap-status: CSU_PCAP_STATUS register (read-only)
Read operations use the existing IOCTL_READ_REG API.
Write operations use the existing IOCTL_MASK_WRITE_REG API.
The firmware enforces access control - read-only registers will reject
write attempts even though the sysfs permissions show write access.
Usage for reading::
# cat /sys/devices/platform/firmware\:zynqmp-firmware/csu_registers/multiboot
# cat /sys/devices/platform/firmware\:zynqmp-firmware/csu_registers/idcode
Usage for writing (mask and value are in hexadecimal)::
# echo 0xFFFFFFF 0x0 > /sys/devices/platform/firmware\:zynqmp-firmware/csu_registers/multiboot
Users: Xilinx/AMD