Add a driver for Epson RX8111 RTC

In this patch series we add a basic driver for Epson RX8111 RTC with support for only reading/writing the time and the ioctls RTC_VL_READ and RTC_VL_CLR.

Datasheet: https://support.epson.biz/td/api/doc_check.php?dl=app_RX8111CE&lang=en

Changes in v3:
* Remove macro define RX8111_DRV_NAME for the driver name.
* Remove macro function RX8111_TIME_BUF_IDX and instead use the offsets as indices directly.
* Remove rx8111_setup() that disabled extended functionality and interrupts.
* Remove comments explaining register value conversions in rx8111_read/set_time().
* Check/clear register flag XST (oscillation stoppage) in rx8111_read/set_time().
* Change vlval to unsigned int in rx8111_ioctl().
* Remove case RTC_VL_CLR in rx8111_ioctl().
* Convert all dev_err() to dev_dbg().
* Convert all dev_err_probe() to dev_dbg() in probe.
* Return without printing from devm_rtc_register_device() in probe.

Link to v2: https://lore.kernel.org/lkml/[email protected]/

Changes in v2:
* Move dt-bindings to trivial-rtc.yaml.

Link to v1: https://lore.kernel.org/lkml/[email protected]/

Waqar Hameed (2):
dt-bindings: rtc: Add Epson RX8111
rtc: Add driver for Epson RX8111

 .../devicetree/bindings/rtc/trivial-rtc.yaml  |   1 +
 drivers/rtc/Kconfig                           |  10 +
 drivers/rtc/Makefile                          |   1 +
 drivers/rtc/rtc-rx8111.c                      | 356 ++++++++++++++++++
 4 files changed, 368 insertions(+)
 create mode 100644 drivers/rtc/rtc-rx8111.c

base-commit: 98b1cc82c4affc16f5598d4fa14b1858671b2263

2.30.2

Epson RX8111 is an RTC with timestamp functionality. Add devicetree bindings requiring the compatible string and I2C slave address (reg) through trivial-rtc.yaml.

---
 Documentation/devicetree/bindings/rtc/trivial-rtc.yaml | 1 +
 1 file changed, 1 insertion(+)

index c9e3c5262c21..3d1bdddcd4d8 100644
@@ -38,6 +38,7 @@ properties:
       - epson,rx8025
       - epson,rx8035
       # I2C-BUS INTERFACE REAL TIME CLOCK MODULE with Battery Backed RAM
+      - epson,rx8111
       - epson,rx8571
       # I2C-BUS INTERFACE REAL TIME CLOCK MODULE
       - epson,rx8581

2.30.2

Epson RX8111 is an RTC with alarm, timer and timestamp functionality. Add a basic driver with support for only reading/writing time (for now).

---
 drivers/rtc/Kconfig      |  10 ++
 drivers/rtc/Makefile     |   1 +
 drivers/rtc/rtc-rx8111.c | 356 +++++++++++++++++++++++++++++++++++++++
 3 files changed, 367 insertions(+)
 create mode 100644 drivers/rtc/rtc-rx8111.c

index 3814e0845e77..ee977f76f220 100644
@@ -639,6 +639,16 @@ config RTC_DRV_RX8010
 	  This driver can also be built as a module. If so, the module
 	  will be called rtc-rx8010.
 
+config RTC_DRV_RX8111
+	tristate "Epson RX8111"
+	select REGMAP_I2C
+	depends on I2C
+	help
+	  If you say yes here you will get support for the Epson RX8111 RTC.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called rtc-rx8111.
+
 config RTC_DRV_RX8581
 	tristate "Epson RX-8571/RX-8581"
 	select REGMAP_I2C

index 7b03c3abfd78..cf1e3dfdd885 100644
@@ -152,6 +152,7 @@ obj-$(CONFIG_RTC_DRV_RX4581)	+= rtc-rx4581.o
 obj-$(CONFIG_RTC_DRV_RX6110)	+= rtc-rx6110.o
 obj-$(CONFIG_RTC_DRV_RX8010)	+= rtc-rx8010.o
 obj-$(CONFIG_RTC_DRV_RX8025)	+= rtc-rx8025.o
+obj-$(CONFIG_RTC_DRV_RX8111)	+= rtc-rx8111.o
 obj-$(CONFIG_RTC_DRV_RX8581)	+= rtc-rx8581.o
 obj-$(CONFIG_RTC_DRV_RZN1)	+= rtc-rzn1.o
 obj-$(CONFIG_RTC_DRV_S35390A)	+= rtc-s35390a.o

2.30.2

Friendly ping incoming!

Yes, this is definitely on my list of things to review before the end of the week.

Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

Applied, thanks!

[1/2] dt-bindings: rtc: Add Epson RX8111

      https://git.kernel.org/abelloni/c/c6a2fb6d14bf
[2/2] rtc: Add driver for Epson RX8111
      https://git.kernel.org/abelloni/c/f8c81d15f4bb

Best regards,

Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com