kernel/drivers/rtc/rtc-sun6i.c, branch linux-4.1.y

rtc: sun6i: Switch to the external oscillator

2017-05-17T19:06:58Z

[ Upstream commit fb61bb82cb46a932ef2fc62e1c731c8e7e6640d5 ] The RTC is clocked from either an internal, imprecise, oscillator or an external one, which is usually much more accurate. The difference perceived between the time elapsed and the time reported by the RTC is in a 10% scale, which prevents the RTC from being useful at all. Fortunately, the external oscillator is reported to be mandatory in the Allwinner datasheet, so we can just switch to it. Cc: stable@vger.kernel.org Fixes: 9765d2d94309 ("rtc: sun6i: Add sun6i RTC driver") Signed-off-by: Maxime Ripard Signed-off-by: Alexandre Belloni Signed-off-by: Sasha Levin

rtc: sun6i: Add some locking

2017-05-17T19:06:58Z

[ Upstream commit a9422a19ce270a22fc520f2278fb7e80c58be508 ] Some registers have a read-modify-write access pattern that are not atomic. Add some locking to prevent from concurrent accesses. Cc: stable@vger.kernel.org Acked-by: Chen-Yu Tsai Signed-off-by: Maxime Ripard Signed-off-by: Alexandre Belloni Signed-off-by: Sasha Levin

rtc: sun6i: Add sun6i RTC driver

2014-09-19T10:39:19Z

This patch introduces the driver for the RTC in the Allwinner A31 and A23 SoCs. Unlike the RTC found in A10/A20 SoCs, which was part of the timer, the RTC in A31/A23 are a separate hardware block, which also contain a few controls for the RTC block hardware (a regulator and RTC block GPIO pin latches), while also having separate interrupts for the alarms. The hardware is different enough to make a different driver for it. Signed-off-by: Chen-Yu Tsai Reviewed-by: Varka Bhadram Signed-off-by: Maxime Ripard