linux-kernel - [PATCH v2 0/4] memory: tegra: Introduce Tegra30 EMC driver

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Message-Id: <20190414202009.31268-1-digetx@gmail.com>
Date:   Sun, 14 Apr 2019 23:20:05 +0300
From:   Dmitry Osipenko <digetx@...il.com>
To:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Peter De Schrijver <pdeschrijver@...dia.com>,
        Prashant Gaikwad <pgaikwad@...dia.com>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Joseph Lo <josephl@...dia.com>
Cc:     devicetree@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/4] memory: tegra: Introduce Tegra30 EMC driver

Hello,

This series introduces driver for the External Memory Controller (EMC)
found on Tegra30 chips, it controls the external DRAM on the board. The
purpose of this driver is to program memory timing for external memory on
the EMC clock rate change. The driver was tested using the ACTMON devfreq
driver that performs memory frequency scaling based on memory-usage load.

Please also note that this patchset is based on this series:

https://www.spinics.net/lists/linux-tegra/msg39687.html

Changelog:

v2: - Added support for changing MC clock diver configuration based on
      Memory Controller (MC) configuration which is part of the memory
      timing.

    - Merged the "Add custom EMC clock implementation" patch into this
      series because the "Introduce Tegra30 EMC driver" patch directly
      depends on it. Please note that Tegra20 EMC driver will need to be
      adapted for the clock changes as well, I'll send out the Tegra20
      patches after this series will be applied because of some other
      dependencies (devfreq) and because the temporary breakage won't
      be critical (driver will just error out on probe).

    - EMC driver now performs MC configuration validation by checking
      that the number of MC / EMC timings matches and that the timings
      rate is the same.

    - EMC driver now supports timings that want to change the MC clock
      configuration.

    - Other minor prettifying changes of the code.

Dmitry Osipenko (4):
  clk: tegra20/30: Add custom EMC clock implementation
  dt-bindings: memory: Add binding for NVIDIA Tegra30 External Memory
    Controller
  memory: tegra: Introduce Tegra30 EMC driver
  ARM: dts: tegra30: Add External Memory Controller node

 .../memory-controllers/nvidia,tegra30-emc.txt |  257 ++++
 arch/arm/boot/dts/tegra30.dtsi                |   11 +
 drivers/clk/tegra/Makefile                    |    2 +
 drivers/clk/tegra/clk-tegra20-emc.c           |  307 +++++
 drivers/clk/tegra/clk-tegra20.c               |   51 +-
 drivers/clk/tegra/clk-tegra30.c               |   35 +-
 drivers/clk/tegra/clk.h                       |    6 +
 drivers/memory/tegra/Kconfig                  |   10 +
 drivers/memory/tegra/Makefile                 |    1 +
 drivers/memory/tegra/mc.c                     |    3 -
 drivers/memory/tegra/mc.h                     |   30 +-
 drivers/memory/tegra/tegra30-emc.c            | 1159 +++++++++++++++++
 drivers/memory/tegra/tegra30.c                |   44 +
 include/linux/clk/tegra.h                     |    6 +
 14 files changed, 1860 insertions(+), 62 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/memory-controllers/nvidia,tegra30-emc.txt
 create mode 100644 drivers/clk/tegra/clk-tegra20-emc.c
 create mode 100644 drivers/memory/tegra/tegra30-emc.c

-- 
2.21.0