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

Dmitry Osipenko
2019-04-14T20:29:19Z

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

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2.21.0