linux-kernel - [PATCH v3 0/3] On-chip RTC support for ExynosAutov9

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Message-Id: <20250905110554.2212304-1-dev.tailor@samsung.com>
Date: Fri,  5 Sep 2025 16:35:51 +0530
From: Devang Tailor <dev.tailor@...sung.com>
To: alexandre.belloni@...tlin.com, robh@...nel.org, krzk+dt@...nel.org,
	conor+dt@...nel.org, alim.akhtar@...sung.com, linux-rtc@...r.kernel.org,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	henrik@...mler.se, faraz.ata@...sung.com
Cc: Devang Tailor <dev.tailor@...sung.com>
Subject: [PATCH v3 0/3] On-chip RTC support for ExynosAutov9

Enable on-chip RTC support. The on-chip RTC of this SoC is similar
to the previous version of Samsung SoCs except for TICNT tick time
counter. So re-use the existing RTC driver with applicable call-backs
for initialization and IRQ handling without accessing TICNT counter.

As suggested in review comment, instead of adding separate disable()
call-back, re-used the existing s3c24xx_rtc_disable() by adding a new
bool 'use_s3c2410_ticnt' in rtc_data to avoid accessing TICNT counter
which is not valid for RTC of ExynosAutov9.

Setting and getting hardware clock has been tested using 'hwclock'
and 'date' utilities.

Alarm interrupt has been checked with incrementing interrupt
count via "cat /proc/interrupts | grep rtc" for 10sec
wakeup time via "echo +10 > /sys/class/rtc/rtc0/wakealarm"

changelog
---
Changes in v3:
- 1/3 : Added Tag 'Reviewed-by'
- 2/3 : Fixed the review comment of v2 to re-use the existing disable()
	instead of adding new one.
      : Not adding Tag 'Reviewed-by' from V2 since the patch has been
	changed
- 3/3 : Added Tag 'Reviewed-by'
link for v2 : https://lore.kernel.org/linux-rtc/20250710083434.1821671-1-dev.tailor@samsung.com/


Changes in v2:
- Fixed the review comment of v1 for mis-aligmnent & asymmetry bit logic.
- link for v1 : https://lore.kernel.org/linux-rtc/20250702052426.2404256-1-dev.tailor@samsung.com/


Devang Tailor (3):
  dt-bindings: rtc: s3c-rtc: add compatible for exynosautov9
  rtc: s3c: support for exynosautov9 on-chip RTC
  arm64: dts: exynosautov9: add RTC DT node

 .../devicetree/bindings/rtc/s3c-rtc.yaml      |  1 +
 .../boot/dts/exynos/exynosautov9-sadk.dts     |  4 ++++
 arch/arm64/boot/dts/exynos/exynosautov9.dtsi  | 10 +++++++++
 drivers/rtc/rtc-s3c.c                         | 21 ++++++++++++++++---
 4 files changed, 33 insertions(+), 3 deletions(-)


base-commit: 4ac65880ebca1b68495bd8704263b26c050ac010
-- 
2.34.1