Tegra20 External Memory Controller driver [LWN.net]

From:		Dmitry Osipenko <digetx-AT-gmail.com>
To:		Thierry Reding <thierry.reding-AT-gmail.com>, Peter De Schrijver <pdeschrijver-AT-nvidia.com>, Jonathan Hunter <jonathanh-AT-nvidia.com>, Prashant Gaikwad <pgaikwad-AT-nvidia.com>, Michael Turquette <mturquette-AT-baylibre.com>, Stephen Boyd <sboyd-AT-kernel.org>, Rob Herring <robh+dt-AT-kernel.org>, Mark Rutland <mark.rutland-AT-arm.com>
Subject:		[PATCH v2 0/5] Tegra20 External Memory Controller driver
Date:		Mon, 4 Jun 2018 01:36:49 +0300
Message-ID:		<20180603223654.23324-1-digetx@gmail.com>
Cc:		linux-tegra-AT-vger.kernel.org, linux-clk-AT-vger.kernel.org, devicetree-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org
Archive-link:		Article

Hello,

Couple years ago the Tegra20 EMC driver was removed from the kernel
due to incompatible changes in the Tegra's clock driver. This patchset
introduces a modernized EMC driver. Currently the sole purpose of the
driver is to initialize DRAM frequency to maximum rate during of the
kernels boot-up. Later we may consider implementing dynamic memory
frequency scaling, utilizing functionality provided by this driver.

Changelog:

v2:
	- Minor code cleanups like consistent use of writel_relaxed instead
	  of non-relaxed version, reworded error messages, etc.

	- Factored out use_pllm_ud bit checking into a standalone patch for
	  consistency.

Dmitry Osipenko (5):
  dt: bindings: tegra20-emc: Document interrupt property
  ARM: dts: tegra20: Add interrupt to External Memory Controller
  clk: tegra20: Turn EMC clock gate into divider
  clk: tegra20: Check whether direct PLLM sourcing is turned off for EMC
  memory: tegra: Introduce Tegra20 EMC driver

 .../bindings/arm/tegra/nvidia,tegra20-emc.txt |   2 +
 arch/arm/boot/dts/tegra20.dtsi                |   1 +
 drivers/clk/tegra/clk-tegra20.c               |  46 +-
 drivers/memory/tegra/Kconfig                  |  10 +
 drivers/memory/tegra/Makefile                 |   1 +
 drivers/memory/tegra/tegra20-emc.c            | 586 ++++++++++++++++++
 6 files changed, 636 insertions(+), 10 deletions(-)
 create mode 100644 drivers/memory/tegra/tegra20-emc.c

-- 
2.17.0