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Each alarm field lives in the low bits of its register and the driver
masks its writes accordingly, so the high byte of four of them is storage
the RTC never touches. MediaTek names these RTC_NEW_SPARE0 to
RTC_NEW_SPARE3 and gives the first to a fuel gauge, which is how its PMIC
battery drivers carry a state of charge over a reboot.
Offer all four as a battery-backed nvmem provider, so that a consumer does
not have to reach into this block behind the driver's back. Doing it here
is what makes it safe: a write lands under the same lock the alarm paths
take, so it can neither be lost inside mtk_rtc_set_alarm()'s
read-modify-write nor fire the write trigger in the middle of one.
The nvmem core does not range check a cell against the provider size, so
the callbacks check the offset themselves.
Tested on an MT6397; MediaTek's spare map for mt6323 matches, and the
alarm field masks are common to every compatible this driver binds.
Assisted-by: LLM
Signed-off-by: Ryan Brue <ryanbrue.dev@gmail.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://patch.msgid.link/20260917-rbrue-suez-upstreaming-mt6397-rtc-nvmem-v1-2-558b8f95cfbc@gmail.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
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RTC_NUM_YEARS has never been used, the other defines are not used since
commit 34bbdc12d04e ("rtc: mt6359: Add RTC hardware range and add support
for start-year")
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20250303223637.1135362-1-alexandre.belloni@bootlin.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
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This patch adds RTC_TC_MTH_MASK to support new chips.
Signed-off-by: Yuchen Huang <yuchen.huang@mediatek.com>
Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Removing the struct member "dev" in mt6397 RTC driver because it's not
initialized and the only usage is for one debugging message.
Also fixed a typo in the error message.
Signed-off-by: Fei Shao <fshao@chromium.org>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Link: https://lore.kernel.org/r/20201008093414.1911699-1-fshao@chromium.org
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This add support for the MediaTek MT6358 RTC. Driver using
compatible data to store different RTC_WRTGR address offset.
This replace RTC_WRTGR to RTC_WRTGR_MT6323 in mt6323-poweroff
driver which only needed by armv7 CPU without ATF.
Signed-off-by: Ran Bi <ran.bi@mediatek.com>
Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
Reviewed-by: Nicolas Boichat <drinkcat@chromium.org>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Acked-by: Sebastian Reichel <sre@kernel.org>
Reviewed-by: Yingjoe Chen <yingjoe.chen@mediatek.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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Alarm registers high byte was reserved for other functions.
This add mask in alarm registers operation functions.
This also fix error condition in interrupt handler.
Fixes: fc2979118f3f ("rtc: mediatek: Add MT6397 RTC driver")
Signed-off-by: Ran Bi <ran.bi@mediatek.com>
Signed-off-by: Hsin-Hsiung Wang <hsin-hsiung.wang@mediatek.com>
Link: https://lore.kernel.org/r/1576057435-3561-6-git-send-email-hsin-hsiung.wang@mediatek.com
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
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move code to separate header-file to reuse definitions later
in poweroff-driver (drivers/power/reset/mt6323-poweroff.c)
Suggested-by: Frank Wunderlich <frank-w@public-files.de>
Signed-off-by: Josef Friedl <josef.friedl@speed.at>
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
Acked-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
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