kernel/linux.git/drivers/rtc/rtc-rzn1.c, branch linux-7.1.y

rtc: rzn1: support input frequencies other than 32768Hz

2025-06-01T21:53:02+00:00

When using the SCMP mode instead of SUBU, this RTC can also support other input frequencies than 32768Hz. Also, upcoming SoCs will only support SCMP. Signed-off-by: Wolfram Sang Reviewed-by: Geert Uytterhoeven Reviewed-by: Miquel Raynal Link: https://lore.kernel.org/r/20250526095801.35781-8-wsa+renesas@sang-engineering.com Signed-off-by: Alexandre Belloni

rtc: rzn1: Disable controller before initialization

2025-06-01T21:53:02+00:00

Datasheet says that the controller must be disabled before setting up either SUBU or SCMP. This did not matter so far because the driver only supported SUBU which was the default, too. It is good practice to follow datasheet recommendations, though. It will also be needed because SCMP mode will be added in a later patch. Signed-off-by: Wolfram Sang Reviewed-by: Miquel Raynal Link: https://lore.kernel.org/r/20250526095801.35781-7-wsa+renesas@sang-engineering.com Signed-off-by: Alexandre Belloni

rtc: rzn1: clear interrupts on remove

2025-04-08T14:17:45+00:00

It is good practice to clear running interrupts before removing the driver. This is not really a bugfix because on current systems RuntimePM will disable the module clock, so interrupts won't be initiated. The dependency on that behaviour is subtle, though. Better be self-contained and clean up when removing. Signed-off-by: Wolfram Sang Link: https://lore.kernel.org/r/20250312100105.36767-2-wsa+renesas@sang-engineering.com Signed-off-by: Alexandre Belloni

rtc: rzn1: implement one-second accuracy for alarms

2025-03-17T22:25:58+00:00

The hardware alarm only supports one-minute accuracy which is coarse and disables UIE usage. Use the 1-second interrupt to achieve per-second accuracy. It is activated once we hit the per-minute alarm. The new feature is optional. When there is no 1-second interrupt, old behaviour with per-minute accuracy is used as before. With this feature, all tests of 'rtctest' are successfully passed. Signed-off-by: Wolfram Sang Link: https://lore.kernel.org/r/20250305101038.9933-2-wsa+renesas@sang-engineering.com Signed-off-by: Alexandre Belloni

rtc: rzn1: reduce register access

2024-11-25T22:32:50+00:00

This RTC has special 32bit registers which return multiple of the same 8bit registers at once. Use these to minimize register access. Also, do the to/from BCD conversions right away, so 'tm' always contains values as described in time.h. Signed-off-by: Wolfram Sang Acked-by: Miquel Raynal Link: https://lore.kernel.org/r/20241122101448.4374-3-wsa+renesas@sang-engineering.com Signed-off-by: Alexandre Belloni

rtc: rzn1: drop superfluous wday calculation

2024-11-25T22:32:50+00:00

The week register simply counts from 0 to 6 where the numbers do not even represent a specific weekday. So we can adopt 'tm_wday' numbering of the RTC core without converting it. Signed-off-by: Wolfram Sang Link: https://lore.kernel.org/r/20241122101448.4374-2-wsa+renesas@sang-engineering.com Signed-off-by: Alexandre Belloni

rtc: rzn1: update Michel's email

2024-11-18T11:05:19+00:00

The Renesas address bounces, use the alternative one. Signed-off-by: Wolfram Sang Link: https://lore.kernel.org/r/20241114193450.13982-1-wsa+renesas@sang-engineering.com Signed-off-by: Alexandre Belloni

rtc: rzn1: fix BCD to rtc_time conversion errors

2024-11-18T11:04:59+00:00

tm_mon describes months from 0 to 11, but the register contains BCD from 1 to 12. tm_year contains years since 1900, but the BCD contains 20XX. Apply the offsets when converting these numbers. Fixes: deeb4b5393e1 ("rtc: rzn1: Add new RTC driver") Signed-off-by: Wolfram Sang Reviewed-by: Miquel Raynal Link: https://lore.kernel.org/r/20241113113032.27409-1-wsa+renesas@sang-engineering.com Signed-off-by: Alexandre Belloni

rtc: Switch back to struct platform_driver::remove()

2024-11-10T21:58:28+00:00

After commit 0edb555a65d1 ("platform: Make platform_driver::remove() return void") .remove() is (again) the right callback to implement for platform drivers. Convert all platform drivers below drivers/rtc to use .remove(), with the eventual goal to drop struct platform_driver::remove_new(). As .remove() and .remove_new() have the same prototypes, conversion is done by just changing the structure member name in the driver initializer. Signed-off-by: Uwe Kleine-König Link: https://lore.kernel.org/r/20241007205803.444994-6-u.kleine-koenig@baylibre.com Signed-off-by: Alexandre Belloni

rtc: rzn1: Report maximum alarm limit to rtc core

2023-08-27T21:50:22+00:00

RZN1 only supports alarms up to one week in the future. Report the limit to the RTC core and use the reported limit to validate the requested alarm time when setting it. Cc: Brian Norris Signed-off-by: Guenter Roeck Reviewed-by: Miquel Raynal Link: https://lore.kernel.org/r/20230817225537.4053865-8-linux@roeck-us.net Signed-off-by: Alexandre Belloni