Linux-Amlogic Archive on
 help / color / Atom feed
From: Martin Blumenstingl <>
Cc: Martin Blumenstingl <>,,,,
Subject: [PATCH v6 0/2] Amlogic Meson6/8/8b/8m2 SoC RTC driver
Date: Sat, 19 Jan 2019 15:43:30 +0100
Message-ID: <> (raw)

This series adds support for the RTC on the 32-bit Amlogic Meson SoCs.

The series does not have any build dependencies, but does require
device-tree entries for the relevant boards.

The series is tested by myself on the Meson8b EC-100 board. Earlier
versions of this series were tested on an Odroid-C1 board with a
battery pack attached by Ben Dooks and Kevin Hilman.

I will send the DT changes in a second series so that they can be
merged once the dependencies have been satisfied.

Changes since v5 at [1]:
- get rid of a dependency on the SZ_16 macro (fixes a kbuild test robot
  compile error)
- rebased on top of v5.0-rc1
- I kept the copyrights / author as in v4 because Ben didn't ask me to
  do it yet (please speak up if I should change it)

Changes since v4 at [0]:
- resurrected Ben's patches after 2 years: first I made it apply
  onto linux-next again
- I decided to update the author of the patch to my own name since I
  made a lot of changes compared to Ben's implementation (list of
  changes below, the diff-stat was: 223 insertions, 163 deletions)
- make the dt-bindings file name (rtc-meson.txt) match the driver name
- add a Meson8m2 compatible
- add the clocks and vdd-supply properties to the match the actual IP
  block implementation
- make the resets and interrupts properties mandatory to match the
  actual IP block implementation
- removed the status property from the dt-bindings example
- fix MODULE_LICENSE to match the actual license (GPL v2)
- switch to SPDX-License-Identifier
- sort the Kconfig option alphabetically
- use BIT() and GENMASK() macros consistenly
- replace #define RTC_REG(x) with actual #defines which match the names
  from the public S805 datasheet
- adjust existing #defines to align with the public S805 datasheet
- add support for the 4x32bit NVMEM (regmem) data
- implement regmap_bus to access the serial registers. this allows
  getting rid of the custom locking code and makes the NVMEM
  implementation much easier.
- use regmap also for accessing the peripheral registers to make the
  code shorter
- add support for the vdd-supply regulator
- switch from devm_rtc_device_register to devm_rtc_allocate_device and
- set range_max to U32_MAX
- use rtc_time64_to_tm and rtc_tm_to_time64
- simplify timeout handling and use shorter timeouts (the driver from
  the 3.10 BSP kernel uses udelay resolution (100us after the reset, 5us
  for the "comm delay") as well as busy-looping from 0..40000 to wait
  for "s_ready"
- removed debug messages which are only printing register values (as
  these can now be seen in


Martin Blumenstingl (2):
  dt-bindings: rtc: add device-tree bindings for the Amlogic Meson RTC
  rtc: support for the Amlogic Meson RTC

 .../devicetree/bindings/rtc/rtc-meson.txt     |  32 ++
 drivers/rtc/Kconfig                           |  11 +
 drivers/rtc/Makefile                          |   1 +
 drivers/rtc/rtc-meson.c                       | 409 ++++++++++++++++++
 4 files changed, 453 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/rtc/rtc-meson.txt
 create mode 100644 drivers/rtc/rtc-meson.c


linux-amlogic mailing list

             reply index

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-19 14:43 Martin Blumenstingl [this message]
2019-01-19 14:43 ` [PATCH v6 1/2] dt-bindings: rtc: add device-tree bindings for the Amlogic Meson RTC Martin Blumenstingl
2019-02-06 22:30   ` Alexandre Belloni
2019-02-09  0:10     ` Martin Blumenstingl
2019-01-19 14:43 ` [PATCH v6 2/2] rtc: support " Martin Blumenstingl
2019-02-06 22:38   ` Alexandre Belloni

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Amlogic Archive on

Archives are clonable:
	git clone --mirror linux-amlogic/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-amlogic linux-amlogic/ \
	public-inbox-index linux-amlogic

Newsgroup available over NNTP:

AGPL code for this site: git clone public-inbox