| From: |
| Ciprian Costea <ciprianmarian.costea-AT-oss.nxp.com> |
| To: |
| Alexandre Belloni <alexandre.belloni-AT-bootlin.com>, Rob Herring <robh-AT-kernel.org>, Krzysztof Kozlowski <krzk+dt-AT-kernel.org>, Conor Dooley <conor+dt-AT-kernel.org>, Catalin Marinas <catalin.marinas-AT-arm.com>, Will Deacon <will-AT-kernel.org> |
| Subject: |
| [PATCH v4 0/4] add NXP RTC driver support for S32G2/S32G3 SoCs |
| Date: |
| Mon, 11 Nov 2024 15:59:36 +0200 |
| Message-ID: |
| <20241111135940.2534034-1-ciprianmarian.costea@oss.nxp.com> |
| Cc: |
| linux-rtc-AT-vger.kernel.org, devicetree-AT-vger.kernel.org, linux-kernel-AT-vger.kernel.org, linux-arm-kernel-AT-lists.infradead.org, imx-AT-lists.linux.dev, NXP S32 Linux <s32-AT-nxp.com>, Christophe Lizzi <clizzi-AT-redhat.com>, Alberto Ruiz <aruizrui-AT-redhat.com>, Enric Balletbo <eballetb-AT-redhat.com>, Ciprian Marian Costea <ciprianmarian.costea-AT-oss.nxp.com> |
| Archive-link: |
| Article |
From: Ciprian Marian Costea <ciprianmarian.costea@oss.nxp.com>
This patch series add support for the NXP
RTC hardware module present on S32G2/S32G3 SoCs.
The RTC module is used to enable Suspend to RAM (STR) support.
RTC tracks clock time during system suspend. It represents a
time-based wakeup source for the S32G2/S32G3 SoCs.
RTC is not battery-powered and it is not kept alive during
system reset.
Following is an example of Suspend to RAM trigger on
S32G2/S32G3 SoCs, using userspace tools such as rtcwake:
# rtcwake -s 2 -m mem
# rtcwake: assuming RTC uses UTC ...
# rtcwake: wakeup from "mem" using /dev/rtc0 at Wed Feb 6 06:28:36 2036
#
Changes in V4:
- Dropped 'assigned-*' clock management approach.
Simplified RTC Runtime and Suspend/Standby clock configuration.
- Simplified error paths on probe function
- Removed node label from bindings example
- Several cosmetic coding style fixes
Changes in V3:
- Removed 'nxp,s32g3-rtc' compatible string
- Change to 'remove' callback from 'remove_new'
- Used 'dev.parent' from 'struct rtc_device' instead of
defining a specific 'struct device' in driver data
- Fixed several errors reported by kernel test robot
- Removed 'assigned-clocks', 'assigned-clock-parents' and
'assigned-clock-rates' from required properties in the
binding documentation.
- Refactored S32G RTC driver such that a default clock source
and divisors configuration will be applied in case 'assigned-clocks'
and 'assigned-clock-parents' properties are missing.
Changes in V2:
- Removed 'clksel' support from dts bindings.
Used clock parents support from CCF to better illustrate the
RTC hardware IP from S32G2/S32G3.
- Removed frequency dividers support from dts bindings.
Used assigned clock frequencies support from CCF instead.
- Reduced the interval while RTC is voluntarily disabled to a simple
register write in order to avoid any race condition between a possbile
rollover and 'suspend' callback execution flow.
- Updated bindings documentation with respect to clocking support.
- Fixed a potential unused variable warning reported
by kernel test robot.
- Updated to usage of 'devm_rtc_allocate_device' and 'devm_rtc_register_device'
instead of deprecated 'devm_rtc_device_register'.
Ciprian Marian Costea (4):
dt-bindings: rtc: add schema for NXP S32G2/S32G3 SoCs
rtc: s32g: add NXP S32G2/S32G3 SoC support
arm64: defconfig: add S32G RTC module support
MAINTAINERS: add NXP S32G RTC driver
.../devicetree/bindings/rtc/nxp,s32g-rtc.yaml | 78 ++
MAINTAINERS | 2 +
arch/arm64/configs/defconfig | 1 +
drivers/rtc/Kconfig | 11 +
drivers/rtc/Makefile | 1 +
drivers/rtc/rtc-s32g.c | 692 ++++++++++++++++++
6 files changed, 785 insertions(+)
create mode 100644 Documentation/devicetree/bindings/rtc/nxp,s32g-rtc.yaml
create mode 100644 drivers/rtc/rtc-s32g.c
--
2.45.2
