APCS "global" is sort of a "miscellaneous" hardware block that combines
multiple registers inside the application processor subsystem. Two distinct
use cases are currently stuffed together in a single device tree node:

 - Mailbox: to communicate with other remoteprocs in the system.
 - Clock: for controlling the CPU frequency.

These two use cases have unavoidable circular dependencies: the mailbox is
needed as early as possible during boot to start controlling shared
resources like clocks and power domains, while the clock controller needs
one of these shared clocks as its parent. Currently, there is no way to
distinguish these two use cases for generic mechanisms like fw_devlink.

This is currently blocking conversion of the deprecated custom "qcom,ipc"
properties to the standard "mboxes", see e.g. commit d92e9ea2f0f9
("arm64: dts: qcom: msm8939: revert use of APCS mbox for RPM"):
  1. remoteproc &rpm needs mboxes = <&apcs1_mbox 8>;
  2. The clock controller inside &apcs1_mbox needs
     clocks = <&rpmcc RPM_SMD_XO_CLK_SRC>.
  3. &rpmcc is a child of remoteproc &rpm

The mailbox itself does not need any clocks and should probe early to
unblock the rest of the boot process. The "clocks" are only needed for the
separate clock controller. In Linux, these are already two separate drivers
that can probe independently.

Break up the circular dependency chain in the device tree by separating the
clock controller into a separate child node. Deprecate the old approach of
specifying the clock properties as part of the root node, but keep them for
backwards compatibility.

Signed-off-by: Stephan Gerhold <stephan.gerhold@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

Add compatible for the Qualcomm SM7150 APCS block to the Qualcomm APCS
binding.

Signed-off-by: David Wronek <david@mainlining.org>
Signed-off-by: Danila Tikhonov <danila@jiaxyga.com>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

Introduce the mailbox module for CV18XX series SoC, which is responsible
for interchanging messages between asymmetric processors.

Signed-off-by: Yuntao Dai <d1581209858@live.com>
Signed-off-by: Junhui Liu <junhui.liu@pigmoral.tech>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

Add the mailbox compatible for MSM8226 SoC.

Signed-off-by: Luca Weiss <luca@lucaweiss.eu>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

Add compatible string "fsl,imx94-mu" for the i.MX94 chip, which is backward
compatible with i.MX95. Set it to fall back to "fsl,imx95-mu".

Signed-off-by: Frank Li <Frank.Li@nxp.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

Add the compatible name and iommus property for MT8196.

In MT8196, all command buffers allocated and used by the GCE device
work with IOMMU.

Signed-off-by: Jason-JH Lin <jason-jh.lin@mediatek.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

Pull mailbox updates from Jassi Brar:

 - samsung: add gs101-mbox driver

 - microchip: add sbi-ipc driver

 - zynqmp: fix invalid __percpu annotation

 - qcom: add IPQ5424 APCS compatible

 - mpfs fix copy and paste bug

 - th1520: Fix NULL vs IS_ERR() and a memory corruption bug

 - tegra-hsp: clear mailbox before using message

* tag 'mailbox-v6.14' of git://git.kernel.org/pub/scm/linux/kernel/git/jassibrar/mailbox:
  riscv: export __cpuid_to_hartid_map
  riscv: sbi: vendorid_list: Add Microchip Technology to the vendor list
  mailbox: th1520: Fix memory corruption due to incorrect array size
  mailbox: zynqmp: Remove invalid __percpu annotation in zynqmp_ipi_probe()
  MAINTAINERS: add entry for Samsung Exynos mailbox driver
  mailbox: add Samsung Exynos driver
  dt-bindings: mailbox: add google,gs101-mbox
  mailbox: qcom: Add support for IPQ5424 APCS IPC
  dt-bindings: mailbox: qcom: Add IPQ5424 APCS compatible
  mailbox: qcom-ipcc: Reset CLEAR_ON_RECV_RD if set from boot firmware
  mailbox: add Microchip IPC support
  dt-bindings: mailbox: add binding for Microchip IPC mailbox controller
  mailbox: tegra-hsp: Clear mailbox before using message
  mailbox: mpfs: fix copy and paste bug in probe
  mailbox: th1520: Fix a NULL vs IS_ERR() bug

Add bindings for the Samsung Exynos Mailbox Controller.

Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

Add compatible for the Qualcomm IPQ5424 APCS block.

Signed-off-by: Gokul Sriram Palanisamy <quic_gokulsri@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>

Add a dt-binding for the Microchip Inter-Processor Communication (IPC)
mailbox controller.

Signed-off-by: Valentina Fernandez <valentina.fernandezalanis@microchip.com>
Reviewed-by: Rob Herring (Arm) <robh@kernel.org>
Signed-off-by: Jassi Brar <jassisinghbrar@gmail.com>