[RFC PATCH 0/3] Initial Renesas R-Car remoteproc support

From: Julien Massot <julien.massot@iot.bzh>
To: bjorn.andersson@linaro.org, mathieu.poirier@linaro.org,
	robh+dt@kernel.org, geert+renesas@glider.be
Cc: linux-renesas-soc@vger.kernel.org,
	linux-remoteproc@vger.kernel.org, devicetree@vger.kernel.org,
	Julien Massot <julien.massot@iot.bzh>
Subject: [RFC PATCH 0/3] Initial Renesas R-Car remoteproc support
Date: Wed, 27 Oct 2021 09:30:17 +0200	[thread overview]
Message-ID: <20211027073020.17055-1-julien.massot@iot.bzh> (raw)

Most of the SoCs in the R-Car gen3 SoC series such as
H3,M3 and E3 have an 'Arm Realtime Core'.
This Realtime core is an Arm Cortex-R7 clocked at 800MHz.
This series adds initial support to load a firmware and start
this remote processor through the remoteproc subsystem.

This series depends on
https://patchwork.kernel.org/project/linux-renesas-soc/patch/20211022122101.66998-1-julien.massot@iot.bzh/
to be able to set the Cortex-R7 boot address.

One of the way to test this driver is to  use the zephyr upstream support
for h3ulcb board 'blinky' demo is my favorite testing firmware.

To generate a firmware with the zephyr project.

follow this starting guide
https://docs.zephyrproject.org/2.7.0/getting_started/index.html

Then compile your zephyr demo
west build -b rcar_h3ulcb_cr7 zephyr/samples/basic/blinky \
    -DCONFIG_KERNEL_ENTRY=\"_vector_table\" \
    --build-dir h3-blinky

Then you can use h3-blinky/zephyr/zephyr.elf as a testing
firmware.

Patch 1/3 adds the dt-bindings

Patch 2/3 adds entries into the dts/dtsi files for r8a77951,
my testing platform. This driver has also been tested on E3 and M3,
but lacks proper zephyr support at the moment.

Modifications to r8a77951-ulcb.dts are given as usage example
and may be dropped in future patchset since it use some memory
range that may be reserved for other usage.

Patch 3/3 is a small driver to cover basic remoteproc
usage: loading firmware from filesystem, starting and stopping the
Cortex-r7 processor.

Julien Massot (3):
  dt-bindings: remoteproc: Add Renesas R-Car
  arm64: dts: renesas: r8a77951: Add CR7 realtime processor
  remoteproc: Add Renesas rcar driver

 .../remoteproc/renesas,rcar-rproc.yaml        |  66 +++++
 arch/arm64/boot/dts/renesas/r8a77951-ulcb.dts |  16 ++
 arch/arm64/boot/dts/renesas/r8a77951.dtsi     |   7 +
 drivers/remoteproc/Kconfig                    |  11 +
 drivers/remoteproc/Makefile                   |   1 +
 drivers/remoteproc/rcar_rproc.c               | 229 ++++++++++++++++++
 6 files changed, 330 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/remoteproc/renesas,rcar-rproc.yaml
 create mode 100644 drivers/remoteproc/rcar_rproc.c

-- 
2.31.1