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 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 rtc_register_device - 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 <debugfs>/regmap/c8100740.rtc-peripheral-registers/registers) [0] https://www.spinics.net/lists/devicetree/msg135413.html 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 -- 2.19.2
