linux-toradex.git/drivers/rtc/Kconfig, branch master

rtc: s35390a: Add pinctrl

2026-10-29T10:15:58+00:00

Allow configuration of pin functions, including:
- keeping the previous configured function
- disabling output
- waking up the system
- minute periodical interrupt (1: 50% duty, 2: 7.81 ms)

If no function has been configured, fallback to previous behaviour.

Reviewed-by: Linus Walleij 
Signed-off-by: Markus Probst 
Link: https://patch.msgid.link/20260930-rtc_s35390a_int1-v10-5-e7b1cbc50a7b@posteo.de
Signed-off-by: Alexandre Belloni

rtc: class: Make the time32 hctosys limit configurable

2026-10-20T13:11:22+00:00

The RTC_HCTOSYS feature faces an impossible dilemma on 32-bit systems:

 a) systemd requires RTC_HCTOSYS=y with the correct timestamp
    for its intended operation

 b) broken RTC hardware can produce random future timestamps
    beyond 2038 at boot time

 c) time32 userspace immediately hangs if the time is set to a
    date beyond 2038 and requires timestamps to be clamped

 d) time64 userspace is intended to survive the actual 2038
    date and requires timestamps to not be clamped

Commit b3a5ac42ab18 ("rtc: hctosys: Ensure system time doesn't overflow
time_t") introduced this limit to protect time32 userspace from future
RTC dates that can break boot and address constraints a), b) and c),
but broke d) in the process by limiting RTC_HCTOSYS to the time32 range
and falling back to RTC_HCTOSYS=n behavior when the RTC time overflows
that.

Make the behavior configurable with a new RTC_HCTOSYS_TIME32_LIMIT
option that chooses between breaking c) or d). On systems with
COMPAT_32BIT_TIME=n, only RTC_HCTOSYS_TIME32_LIMIT=n is allowed since
userspace can be assumed to be fully built for time64. 64-bit kernels
running 32-bit userland never had the cutoff and continue to not offer
the option.

Warn on rejection with the RTC date and option name so users can
identify the cause and find the setting.

[arnd: reword Kconfig text and patch description,
       add COMPAT_32BIT_TIME dependency]
----
I ended up rewriting most of the text but kept Karl's ownership
as he did the original patch.

Fixes: b3a5ac42ab18 ("rtc: hctosys: Ensure system time doesn't overflow time_t")
Link: https://lore.kernel.org/all/20220908115337.1604277-1-arnd@kernel.org/
Assisted-by: LLM
Signed-off-by: Karl Mehltretter 
Signed-off-by: Arnd Bergmann 
Link: https://patch.msgid.link/20261020080026.2461578-1-arnd@kernel.org
Signed-off-by: Alexandre Belloni

rtc: Add Raspberry Pi 5 RTC driver

2026-10-19T20:24:02+00:00

Upstreaming the downstream Raspberry Pi 5 RTC driver.
This driver supports the custom DA9091,
which is accessed through the firmware mailbox.

Based on code originally written by Jonathan Bell

and Dom Cobley 

Reviewed-by: Stefan Wahren 
Signed-off-by: Sander Speetjens 
Link: https://patch.msgid.link/20261018151056.1051330-4-sander.speetjens@gmail.com
Signed-off-by: Alexandre Belloni

rtc: abx80x: add support for ABX81X

2026-10-09T15:03:20+00:00

Abracon ABX81X is a family of RTCs with SPI interface featuring
the same functionalities as the ABX80X I2C clocks.

Signed-off-by: Antoni Pokusinski 
Link: https://patch.msgid.link/20260916205138.16771-10-apokusinski01@gmail.com
Signed-off-by: Alexandre Belloni

rtc: abx80x: use regmap instead of I2C specific API

2026-10-09T15:03:20+00:00

Rework the driver so that it uses regmap_* functions for communication
with the device instead of the i2c_smbus_* API. This way the support for
ABX81X RTCs which use SPI can be added later.

Signed-off-by: Antoni Pokusinski 
Link: https://patch.msgid.link/20260916205138.16771-7-apokusinski01@gmail.com
Signed-off-by: Alexandre Belloni

rtc: msc313: Select by default on MSTARV7

2026-08-24T12:56:17+00:00

All of the ARCH_MSTARV7 chips have this RTC so it's more likely
ARCH_MSTARV7 wants it than doesn't.

At the same time fix up the indent on the depends on line that looks
like it got converted from a tab to spaces at some point.

Signed-off-by: Daniel Palmer 
Link: https://patch.msgid.link/20260713133919.1356748-1-daniel@thingy.jp
Signed-off-by: Alexandre Belloni

rtc: Kconfig: Broaden RTC_DRV_RZN1 dependency to ARCH_RENESAS

2026-08-23T19:23:57+00:00

Replace the ARCH_RZN1 dependency with ARCH_RENESAS for the RTC_DRV_RZN1
config option to make the driver available across both ARM32 and ARM64
Renesas architectures.

The newer RZ/T2H and RZ/N2H ARM64 SoCs integrate a closely related variant
of the RTC IP block found on the RZ/N1 SoCs. Update the build dependency
and expand the Kconfig help text to allow this driver to be selected for
these additional platforms.

Signed-off-by: Lad Prabhakar 
Reviewed-by: Wolfram Sang 
Tested-by: Wolfram Sang 
Link: https://patch.msgid.link/20260821211032.13554-9-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Alexandre Belloni

rtc: remove unused pcap driver

2026-06-22T22:13:35+00:00

The platform was removed a few years ago, and the mfd driver
is also gone now, so it is impossible to build or use it.

Signed-off-by: Arnd Bergmann 
Link: https://patch.msgid.link/20260527193927.3523952-1-arnd@kernel.org
Signed-off-by: Alexandre Belloni

rtc: pic32: allow driver to be compiled with COMPILE_TEST

2026-04-12T20:53:18+00:00

This driver currently only supports builds against a PIC32 target. Now
that commit ed65ae9f6c6b ("rtc: pic32: update include to use pic32.h
from platform_data") is merged, it's possible to compile this driver on
other architectures.

To avoid future breakage of this driver in the future, let's update the
Kconfig so that it can be built with COMPILE_TEST enabled on all
architectures.

Signed-off-by: Brian Masney 
Link: https://patch.msgid.link/20260222-rtc-pic32-v1-1-3f8eb654a34d@redhat.com
Signed-off-by: Alexandre Belloni

Merge tag 'rtc-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux

2026-02-22T17:43:11+00:00

Pull RTC updates from Alexandre Belloni:

 - loongson: Loongson-2K0300 support

 - s35390a: nvmem support

 - zynqmp: rework calibration

* tag 'rtc-7.0' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux:
  rtc: ds1390: fix number of bytes read from RTC
  rtc: class: Remove duplicate check for alarm
  rtc: optee: simplify OP-TEE context match
  rtc: interface: Alarm race handling should not discard preceding error
  rtc: s35390a: implement nvmem support
  rtc: loongson: Add Loongson-2K0300 support
  dt-bindings: rtc: loongson: Document Loongson-2K0300 compatible
  dt-bindings: rtc: loongson: Correct Loongson-1C interrupts property
  dt-bindings: rtc: renesas,rz-rtca3: Add RZ/V2N support
  dt-bindings: rtc: cpcap: convert to schema
  rtc: zynqmp: use dynamic max and min offset ranges
  rtc: zynqmp: rework set_offset
  rtc: zynqmp: rework read_offset
  rtc: zynqmp: check calibration max value
  rtc: zynqmp: correct frequency value
  rtc: amlogic-a4: Remove IRQF_ONESHOT
  rtc: pcf8563: use correct of_node for output clock
  rtc: max31335: use correct CONFIG symbol in IS_REACHABLE()
  rtc: nvvrs: Add ARCH_TEGRA to the NV VRS RTC driver