[PATCH v7 0/6] add mailbox support for i.MX7D

[Oleksij Rempel <o.rempel@pengutronix.de>]

20180626 changes v7:
- DT: add i.MX6SX and i.MX7S to the documentation.
- imx-mailbox: don't use devm_ functions for startup and shutdown.
- imx-mailbox: rename imx_mu_rmw to imx_mu_xcr_rmw and add locks
- imx-mailbox: pass of_property_read_bool directly to side_b

20180622 changes v6:
- include one more patch provided by Aisheng
- DT: add fall back compatible fsl,imx6sx-mu
- imx-mailbox: for now, use only fsl,imx6sx-mu

20180621 changes v5:
- DT: revert most of the changes from previous version
- imx-mailbox: remove struct imx_mu_cfg
- imx-mailbox: remove !! from imx_mu_last_tx_done()

20180618 changes v4:
- DT: change fsl,mu-side-a to fsl,mu-side-b
- DT: split the patches.
- DT: add all currently known SoCs.
- imx-mailbox: free allocated irq name on channel shutdown
- imx-mailbox: rename *_imx7 functions to *_generic

20180615 changes v3:
- DT: remove prosaic part of documentation. It describes software
  or firmware specific usage and not relevant for HW description.
- DT: use <soc>-mu instead of <soc>-mu-<mu side> and add fsl,mu-side-a
  parameter.
- DT: add most of know i.MX variants with MU
- imx-mailbox: use macros instead of precalculated bit index.
- imx-mailbox: remove warning message for clk.
- imx-mailbox: use imx_mu_chan[%idx] for devm_request_irq.
- imx-mailbox: depend on ARCH_MXC instead of SOX_IMX7

20180615 changes v2:
- DT: use mailbox@ instead of mu@
- DT: change interrupts description
- clk: use imx_clk_gate4 instead of imx_clk_gate2
- imx-mailbox: remove last_tx_done support
- imx-mailbox: fix module description 

This patches are providing support for mailbox (Messaging Unit)
for i.MX7D.
Functionality was tested on PHYTEC phyBOARD-Zeta i.MX7D with
Linux running on all cores: ARM Cortex-A7 and ARM Cortex-M4.

Both parts of i.MX messaging Unit are visible for all CPUs available
on i.MX7D. Communication worked independent of MU side in combination
with CPU. For example MU-A used on ARM Cortex-A7 and MU-B used on ARM Cortex-M4
or other ways around.

Dong Aisheng (2):
  dt-bindings: mailbox: allow mbox-cells to be equal to 0
  dt-bindings: arm: fsl: add mu binding doc

Oleksij Rempel (4):
  dt-bindings: mailbox: imx-mu: add generic MU channel support
  dt-bindings: mailbox: imx-mu: add i.MX6SX and i.MX7S SoCs.
  ARM: dts: imx7s: add i.MX7 messaging unit support
  mailbox: Add support for i.MX7D messaging unit

 .../devicetree/bindings/mailbox/fsl,mu.txt    |  41 +++
 .../devicetree/bindings/mailbox/mailbox.txt   |   3 +-
 arch/arm/boot/dts/imx7s.dtsi                  |  19 ++
 drivers/mailbox/Kconfig                       |   6 +
 drivers/mailbox/Makefile                      |   2 +
 drivers/mailbox/imx-mailbox.c                 | 276 ++++++++++++++++++
 6 files changed, 345 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/mailbox/fsl,mu.txt
 create mode 100644 drivers/mailbox/imx-mailbox.c

-- 
2.18.0