From: Markus Mayer <mmayer@xxxxxxxxxxxx>
This series introduces a driver to interact with the Broadcom STB DDR
PHY Front End (DPFE), specifically to communicate with the DCPU that is
part of the DDR PHY and which is running its own firmware.
The DCPU provides information such as DRAM refresh rate, which can be
used as indirect indicator for the DRAM temperature (the higher the
refresh rate, the hotter the RAM).
The series was previously submitted as HWMON driver[1]. It has been
removed from that subsystem, because it doesn't provide any standard
HWMON data due to hardware design properties, and is now implemented as
SoC driver.
Changes since v2:
- moved driver from drivers/soc/bcm/brcmstb to drivers/memory
- renamed the driver from dpfe.c to brcmstb_dpfe.c
- added le32_to_cpu() in a few places (where be32_to_cpu() calls
already existed)
- added a little blurb what the le32_to_cpu()/be32_to_cpu() business
is all about
Changes since v1:
- binding simplified to use one node with three memory regions
instead of three nodes with one region
- no longer part of the HWMON subsystem
- better error handling and error reporting to userland
- uses [readl|writel]_relaxed() directly, since there is no need for
wrappers doing endian conversion
- re-download firmware upon "resume"
- minor changes to improve clarity
[1] https://lkml.org/lkml/2017/4/18/640
Markus Mayer (2):
dt/bindings: Add bindings for Broadcom STB DRAM Sensors
memory: brcmstb: Add driver for DPFE
.../bindings/memory-controllers/brcm,dpfe-cpu.txt | 27 +
MAINTAINERS | 8 +
drivers/memory/Makefile | 1 +
drivers/memory/brcmstb_dpfe.c | 701 +++++++++++++++++++++
4 files changed, 737 insertions(+)
create mode 100644 Documentation/devicetree/bindings/memory-controllers/brcm,dpfe-cpu.txt
create mode 100644 drivers/memory/brcmstb_dpfe.c
--
2.7.4
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