This patch adds required changes in the Tegra BPMP driver to make it
compatible with ACPI based platforms.
On ACPI systems, IPC is handled through the AML method instead of the
core kernel framework using Mailboxes and IVC.
Bypass clock, reset and powergate init calls as these are not controlled
by the Linux drivers on ACPI based systems.

Signed-off-by: Aniruddha Rao <anrao@nvidia.com>

(backported from V4 internal mail <20260423140823.2848045-3-anrao@nvidia.com>)
[kobak: Add !ACPI_HANDLE(bpmp->dev) guard around bpmp->soc->ops->init
 because ACPI match driver_data=0 makes bpmp->soc NULL; make BPMP
 debugfs directory per-device on ACPI systems to avoid duplicate
 /sys/kernel/debug/bpmp collision on dual NVDA3001 instances.]

Signed-off-by: Koba Ko <kobak@nvidia.com>

Tegra410 exposes memory bandwidth QoS for PCIe and GPU UPHY traffic on the
path to DRAM. Each bandwidth group can cap PCIe read, PCIe write, or
combined GPU UPHY read and write traffic, with target limits.

The memory bandwidth QoS is not exposed as ordinary host MMIO and
cannot be controlled from the kernel. The bandwidth limits can be programmed
by sending the corresponding requests (MBWT MRQ) to the BPMP.

On Tegra410, an ACPI-based platform, Linux BPMP driver does not use the
device-tree mailbox path for communicating with the BPMP firmware.
As a result, there is no existing client driver or interface that can be
used to send the memory bandwidth requests to the BPMP.

This patch exposes a sysfs directory mbwt_control on the tegra-bpmp platform
device with pcie_instance_id, vc_type, and bandwidth.
Writing bandwidth issues an MBWT_SET for the selected group (pcie_instance_id)
and traffic class (vc_type).
A read issues MBWT_GET and returns pcie_instance_id, vc_type, and the
bandwidth value reported by firmware.

These attributes are exposed only if MBWT QUERY probe reports both
MBWT_SET and MBWT_GET commands as supported.

ABI documented in Documentation/ABI/testing/sys-platform-tegra-bpmp

Signed-off-by: Aniruddha Rao <anrao@nvidia.com>

(backported from V4 internal mail <20260423140823.2848045-4-anrao@nvidia.com>)
[kobak: Keep functional MRQ_SOCHUB_MBWT ABI definitions and sysfs
 interface from V4; condense verbose per-field ABI comments while
 preserving enum/struct layout and Documentation/ABI coverage.]

Signed-off-by: Koba Ko <kobak@nvidia.com>