firmware: tegra: Make TEGRA_IVC a hidden Kconfig symbol

kconfiglint reports:

K002: config TEGRA_BPMP selects visible symbol TEGRA_IVC which has
dependencies

TEGRA_IVC was originally intr

firmware: tegra: Make TEGRA_IVC a hidden Kconfig symbol

kconfiglint reports:

K002: config TEGRA_BPMP selects visible symbol TEGRA_IVC which has
dependencies

TEGRA_IVC was originally introduced in
commit ca791d7f4256 ("firmware: tegra:
Add IVC library") as a user-visible
bool with a prompt ("Tegra IVC protocol"). At that time, TEGRA_BPMP
depended on TEGRA_IVC, requiring users to manually enable it.

Recently,
commit 78eb18020a88 ("firmware: tegra: Fix IVC dependency problems")
recognized that TEGRA_IVC is library code that should be activated via
`select` rather than user selection. That commit changed TEGRA_BPMP from
`depends on TEGRA_IVC` to `select TEGRA_IVC`, and restricted TEGRA_IVC's
prompt to only appear under COMPILE_TEST
(`bool "Tegra IVC protocol" if COMPILE_TEST`). The commit message
explicitly states: "The IVC code is library code that other drivers need to
select if they need that library."

However, the `if COMPILE_TEST` qualifier still leaves TEGRA_IVC as a
technically visible symbol, triggering K002 when TEGRA_BPMP selects it.
Since TEGRA_IVC depends on ARCH_TEGRA, it cannot be independently enabled
under COMPILE_TEST without ARCH_TEGRA anyway, limiting the value of the
standalone COMPILE_TEST path. TEGRA_BPMP itself provides adequate
COMPILE_TEST coverage for the IVC library through its own dependency chain.

Complete the transition to a pure library symbol by removing the prompt
entirely, making TEGRA_IVC a hidden bool activated only via select from
TEGRA_BPMP. This is consistent with the intent expressed in 78eb18020a88.

Assisted-by: Claude:claude-opus-4-6 kconfiglint
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Thierry Reding <treding@nvidia.com>

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firmware: tegra: Fix IVC dependency problems

The IVC code is library code that other drivers need to select if they
need that library. However, if the symbol is user-selectable this can
lead to conf

firmware: tegra: Fix IVC dependency problems

The IVC code is library code that other drivers need to select if they
need that library. However, if the symbol is user-selectable this can
lead to conflicts.

Fix this by making the symbol only selectable for COMPILE_TEST and add
a select TEGRA_IVC to TEGRA_BPMP, which is currently the only user.

Link: https://lore.kernel.org/r/20250506133118.1011777-10-thierry.reding@gmail.com
Signed-off-by: Thierry Reding <treding@nvidia.com>

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tegra: mark BPMP driver as little-endian only

The BPMP firmware driver never worked on big-endian kernels, and
cannot easily be made portable. Add a dependency to make this clear
in case anyone ever

tegra: mark BPMP driver as little-endian only

The BPMP firmware driver never worked on big-endian kernels, and
cannot easily be made portable. Add a dependency to make this clear
in case anyone ever wants to try a big-endian kernel on this hardware.

Link: https://lore.kernel.org/linux-arm-kernel/Y34FCQ3xTmcjqKRT@orome/
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

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firmware: tegra: Fix a typo in Kconfig

A 'n' is mising in 'commuication'

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Thierry Reding <treding@nvidia.com>

treewide: Add SPDX license identifier - Makefile/Kconfig

Add SPDX license identifiers to all Make/Kconfig files which:

- Have no license information of any form

These files fall under the project

treewide: Add SPDX license identifier - Makefile/Kconfig

Add SPDX license identifiers to all Make/Kconfig files which:

- Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

GPL-2.0-only

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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firmware: tegra: Add BPMP support

The Boot and Power Management Processor (BPMP) is a co-processor found
on Tegra SoCs. It is designed to handle the early stages of the boot
process and offload powe

firmware: tegra: Add BPMP support

The Boot and Power Management Processor (BPMP) is a co-processor found
on Tegra SoCs. It is designed to handle the early stages of the boot
process and offload power management tasks (such as clocks, resets,
powergates, ...) as well as system control services.

Compared to the ARM SCPI, the services provided by BPMP are message-
based rather than method-based. The BPMP firmware driver provides the
services to transmit data to and receive data from the BPMP. Users can
also register a Message ReQuest (MRQ), for which a service routine will
be run when a corresponding event is received from the firmware.

A set of messages, called the BPMP ABI, are specified for a number of
different services provided by the BPMP (such as clocks or resets).

Based on work by Sivaram Nair <sivaramn@nvidia.com> and Joseph Lo
<josephl@nvidia.com>.

Signed-off-by: Thierry Reding <treding@nvidia.com>

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firmware: tegra: Add IVC library

The Inter-VM communication (IVC) is a communication protocol which is
designed for interprocessor communication (IPC) or the communication
between the hypervisor and

firmware: tegra: Add IVC library

The Inter-VM communication (IVC) is a communication protocol which is
designed for interprocessor communication (IPC) or the communication
between the hypervisor and the virtual machine with a guest OS.

Message channels are used to communicate between processors. They are
backed by DRAM or SRAM, so care must be taken to maintain coherence of
data.

The IVC library maintains memory-based descriptors for the transmission
and reception channels as well as the data coherence of the counter and
payload. Clients, such as the driver for the BPMP firmware, can use the
library to exchange messages with remote processors.

Based on work by Peter Newman <pnewman@nvidia.com> and Joseph Lo
<josephl@nvidia.com>.

Signed-off-by: Thierry Reding <treding@nvidia.com>

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