linux-kernel - [PATCH 0/2] ARM: da850: new drivers for better LCDC support

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Date:   Wed, 26 Oct 2016 19:35:53 +0200
From:   Bartosz Golaszewski <bgolaszewski@...libre.com>
To:     Kevin Hilman <khilman@...libre.com>,
        Michael Turquette <mturquette@...libre.com>,
        Sekhar Nori <nsekhar@...com>, Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mark Rutland <mark.rutland@....com>,
        Peter Ujfalusi <peter.ujfalusi@...com>,
        Russell King <linux@...linux.org.uk>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        arm-soc <linux-arm-kernel@...ts.infradead.org>,
        linux-drm <dri-devel@...ts.freedesktop.org>,
        linux-devicetree <devicetree@...r.kernel.org>,
        Jyri Sarha <jsarha@...com>,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        David Airlie <airlied@...ux.ie>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>
Subject: [PATCH 0/2] ARM: da850: new drivers for better LCDC support

This series adds two new drivers in order to better support the LCDC
rev1 present on the da850 boards.

The first patch adds a new memory driver which allows to write to the
DDR2/mDDR memory controller present on the da8xx SoCs. Since the
memory controller region is not mapped by anyone else, I went with
platform_get_resource() and ioremap() approach.

The second patch adds a new bus driver which allows to interact with
the MSTPRI registers of the SYSCFG0 module. The SYSCFG0 registers
are used by many drivers, hence the syscon/regmap approach.

As is mentioned in the comments: we don't want to commit to supporting
stable interfaces (DT bindings or sysfs attributes) so we hardcode the
settings required by some boards (for now only da850-lcdk) with the
hope that linux gets an appropriate framework for performance knobs
in the future.

Potential extensions of these drivers should be straightforward in the
future.

Tested on a da850-lcdk with a display connected over VGA and some
additional work on the tilcdc driver.

NOTE I'm sending this as v1, but it's a follow-up to a series I sent
previously and the RFC with the ddrctl driver. I dropped the dt patch
for now.

Bartosz Golaszewski (2):
  ARM: memory: da8xx-ddrctl: new driver
  ARM: bus: da8xx-mstpri: new driver

 .../devicetree/bindings/bus/ti,da850-mstpri.txt    |  20 ++
 .../memory-controllers/ti-da8xx-ddrctl.txt         |  20 ++
 drivers/bus/Kconfig                                |   9 +
 drivers/bus/Makefile                               |   2 +
 drivers/bus/da8xx-mstpri.c                         | 266 +++++++++++++++++++++
 drivers/memory/Kconfig                             |   8 +
 drivers/memory/Makefile                            |   1 +
 drivers/memory/da8xx-ddrctl.c                      | 175 ++++++++++++++
 8 files changed, 501 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/bus/ti,da850-mstpri.txt
 create mode 100644 Documentation/devicetree/bindings/memory-controllers/ti-da8xx-ddrctl.txt
 create mode 100644 drivers/bus/da8xx-mstpri.c
 create mode 100644 drivers/memory/da8xx-ddrctl.c

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2.9.3