From: Akhilesh Patil <akhilesh@ee.iitb.ac.in>
To: alexandre.belloni@bootlin.com, krzk+dt@kernel.org,
robh@kernel.org, conor+dt@kernel.org
Cc: skhan@linuxfoundation.org, linux-rtc@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
akhileshpatilvnit@gmail.com
Subject: [PATCH v3 0/6] rtc: m41t93: add new features alarm, clock out, watchdog
Date: Sat, 20 Sep 2025 20:30:48 +0530 [thread overview]
Message-ID: <cover.1758379856.git.akhilesh@ee.iitb.ac.in> (raw)
This patch series adds following to m41t93 rtc driver.
Functionalities:
- Alarm support (support to configure alarm 1)
- Square wave output support
- Watchdog support
Code improvements:
this series migrates existing driver to use standard regmap interface
for spi instead of direct spi calls and uses regmap for new features.
Device tree support:
Adds device tree support to the driver along with binding documentation.
Testing:
This patch series is validated on TI am62x board with m41t93 rtc chip
connected to spi0 bus.
regmap migration is additionally tested by observing spi transfers
with the help of logic analyzer. Short summary of test flow is added in
commit message of respective features.
Datasheet:
https://www.st.com/resource/en/datasheet/m41t93.pdf
patch 4 to 6 depend on patch 3 (regmap patch)
Signed-off-by: Akhilesh Patil <akhilesh@ee.iitb.ac.in>
---
Changes in v3:
- Address comments on bindings from Krzysztof and add myself
as a maintainer.
- Re-validation/testing on top of v6.17-rc6
- Link to v2: https://lore.kernel.org/lkml/cover.1757510157.git.akhilesh@ee.iitb.ac.in/
Changes in v2:
- Address DTS and bindings coding style feedback from Krzysztof
- Verify bindings using $ make dt_binding_check
- Update example in binding documentation after testing.
- Analyze and Fix build warnings as suggested by kernel test robot.
- Drop patch 5 from series (device detect logic change).
This will be taken separately. Focus on functionalities in this series.
- Update commit messages with short test steps for each feature.
- Link to v1: https://lore.kernel.org/lkml/cover.1756908788.git.akhilesh@ee.iitb.ac.in/
---
Akhilesh Patil (6):
dt-bindings: rtc: Add ST m41t93
rtc: m41t93: add device tree support
rtc: m41t93: migrate to regmap api for register access
rtc: m41t93: Add alarm support
rtc: m41t93: Add square wave clock provider support
rtc: m41t93: Add watchdog support
.../devicetree/bindings/rtc/st,m41t93.yaml | 50 ++
drivers/rtc/rtc-m41t93.c | 488 ++++++++++++++++--
2 files changed, 486 insertions(+), 52 deletions(-)
create mode 100644 Documentation/devicetree/bindings/rtc/st,m41t93.yaml
--
2.34.1
next reply other threads:[~2025-09-20 15:01 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-20 15:00 Akhilesh Patil [this message]
2025-09-20 15:01 ` [PATCH v3 1/6] dt-bindings: rtc: Add ST m41t93 Akhilesh Patil
2025-09-22 20:27 ` Rob Herring (Arm)
2025-09-20 15:01 ` [PATCH v3 2/6] rtc: m41t93: add device tree support Akhilesh Patil
2025-09-20 15:02 ` [PATCH v3 3/6] rtc: m41t93: migrate to regmap api for register access Akhilesh Patil
2025-09-20 15:02 ` [PATCH v3 4/6] rtc: m41t93: Add alarm support Akhilesh Patil
2025-09-20 15:03 ` [PATCH v3 5/6] rtc: m41t93: Add square wave clock provider support Akhilesh Patil
2025-09-20 15:03 ` [PATCH v3 6/6] rtc: m41t93: Add watchdog support Akhilesh Patil
2025-10-02 15:51 ` [PATCH v3 0/6] rtc: m41t93: add new features alarm, clock out, watchdog Akhilesh Patil
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