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2019-09-01rtc: pcf8563: convert to devm_rtc_allocate_deviceAlexandre Belloni1-8/+9
This allows further improvement of the driver. Link: https://lore.kernel.org/r/20190829212547.19185-3-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-09-01rtc: pcf8563: add Microcrystal RV8564 compatibleAlexandre Belloni2-1/+4
Add a compatible string for the Microcrystal RV8564. Link: https://lore.kernel.org/r/20190829212547.19185-2-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-09-01rtc: pcf8563: add Epson RTC8564 compatibleAlexandre Belloni2-1/+2
Add a compatible string for the Epson RTC8564. Link: https://lore.kernel.org/r/20190829212547.19185-1-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-09-01rtc: s35390a: convert to devm_i2c_new_dummy_device()Wolfram Sang1-41/+13
I was about to simplify the call to i2c_unregister_device() when I realized that converting to devm_i2c_new_dummy_device() will simplify the driver a lot. So I took this approach. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Link: https://lore.kernel.org/r/20190830133124.21633-3-wsa+renesas@sang-engineering.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-09-01rtc: max77686: convert to devm_i2c_new_dummy_device()Wolfram Sang1-13/+4
I was about to simplify the call to i2c_unregister_device() when I realized that converting to devm_i2c_new_dummy_device() will simplify the driver a lot. So I took this approach. Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Link: https://lore.kernel.org/r/20190830133124.21633-2-wsa+renesas@sang-engineering.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-09-01rtc: pcf85363/pcf85263: fix regmap error in set_timeBiwen Li1-1/+6
Issue: - # hwclock -w hwclock: RTC_SET_TIME: Invalid argument Why: - Relative commit: 8b9f9d4dc511 ("regmap: verify if register is writeable before writing operations"), this patch will always check for unwritable registers, it will compare reg with max_register in regmap_writeable. - The pcf85363/pcf85263 has the capability of address wrapping which means if you access an address outside the allowed range (0x00-0x2f) hardware actually wraps the access to a lower address. The rtc-pcf85363 driver will use this feature to configure the time and execute 2 actions in the same i2c write operation (stopping the clock and configure the time). However the driver has also configured the `regmap maxregister` protection mechanism that will block accessing addresses outside valid range (0x00-0x2f). How: - Split of writing regs to two parts, first part writes control registers about stop_enable and resets, second part writes RTC time and date registers. Signed-off-by: Biwen Li <biwen.li@nxp.com> Link: https://lore.kernel.org/r/20190829021418.4607-1-biwen.li@nxp.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-09-01rtc: snvs: switch to rtc_time64_to_tm/rtc_tm_to_time64Alexandre Belloni1-9/+4
Call the 64bit versions of rtc_tm time conversion now that the range is enforced by the core. Link: https://lore.kernel.org/r/20190828205056.31321-2-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-09-01rtc: snvs: set rangeAlexandre Belloni1-0/+1
The SNVS is a 47-bit counter incremented at 32768Hz, it is then a 32-bit second counter. Link: https://lore.kernel.org/r/20190828205056.31321-1-alexandre.belloni@bootlin.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-08-29rtc: snvs: fix possible race conditionAnson Huang1-4/+7
The RTC IRQ is requested before the struct rtc_device is allocated, this may lead to a NULL pointer dereference in IRQ handler. To fix this issue, allocating the rtc_device struct before requesting the RTC IRQ using devm_rtc_allocate_device, and use rtc_register_device to register the RTC device. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Reviewed-by: Dong Aisheng <aisheng.dong@nxp.com> Link: https://lore.kernel.org/r/20190716071858.36750-1-Anson.Huang@nxp.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-08-27rtc: pcf2127: bugfix: watchdog build dependencyBruno Thomsen2-0/+3
Disable watchdog registation when kernel is build without watchdog functionality, and enable watchdog core otherwise. This removes compile errors like the one below: drivers/rtc/rtc-pcf2127.o: in function `pcf2127_probe.constprop.3': rtc-pcf2127.c:(.text.unlikely+0x2c8): undefined reference to `devm_watchdog_register_device' Watchdog feature in chip will always be configured as this is safe to do in both cases and minimize code churn. Reported-by: Hulk Robot <hulkci@huawei.com> Reported-by: YueHaibing <yuehaibing@huawei.com> Fixes: bbc597561ce1 ("rtc: pcf2127: add watchdog feature support") Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com> Link: https://lore.kernel.org/r/20190827143656.4734-1-bruno.thomsen@gmail.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-08-27rtc: pcf2127: add tamper detection supportBruno Thomsen1-0/+160
Add support for integrated tamper detection function in both PCF2127 and PCF2129 chips. This patch implements the feature by adding an additional timestamp0 file to sysfs device path. This file contains seconds since epoch, if an event occurred, or is empty, if none occurred. Interface should match ISL1208 and RV3028 RTC drivers. Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com> Link: https://lore.kernel.org/r/20190822131936.18772-5-bruno.thomsen@gmail.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-08-27rtc: pcf2127: add watchdog feature supportBruno Thomsen2-1/+124
Add partial support for the watchdog functionality of both PCF2127 and PCF2129 chips. The programmable watchdog timer is currently using a fixed clock source of 1Hz. This result in a selectable range of 1-255 seconds, which covers most embedded Linux use-cases. Clock sources of 4096Hz, 64Hz and 1/60Hz is mostly useful in MCU use-cases. Countdown timer not available when using watchdog feature. Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com> Acked-by: Guenter Roeck <linux@roeck-us.net> Link: https://lore.kernel.org/r/20190822131936.18772-4-bruno.thomsen@gmail.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-08-23rtc: pcf2127: bugfix: read rtc disables watchdogBruno Thomsen1-20/+12
The previous fix listed bulk read of registers as root cause of accendential disabling of watchdog, since the watchdog counter register (WD_VAL) was zeroed. Fixes: 3769a375ab83 rtc: pcf2127: bulk read only date and time registers. Tested with the same PCF2127 chip as Sean reveled root cause of WD_VAL register value zeroing was caused by reading CTRL2 register which is one of the watchdog feature control registers. So the solution is to not read the first two control registers (CTRL1 and CTRL2) in pcf2127_rtc_read_time as they are not needed anyway. Size of local buf variable is kept to allow easy usage of register defines to improve readability of code. Debug trace line was updated after CTRL1 and CTRL2 are no longer read from the chip. Also replaced magic numbers in buf access with register defines. Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com> Link: https://lore.kernel.org/r/20190822131936.18772-3-bruno.thomsen@gmail.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-08-23rtc: pcf2127: cleanup register and bit definesBruno Thomsen1-26/+33
Cleanup of defines to follow kernel coding style and increase code readability by using same register and bit define style. Change PCF2127_REG_RAM_{addr_MSB,wrt_cmd,rd_cmd} to upper case as kernel coding guide section 12 'Macros, Enums and RTL' states "Names of macros defining constants and labels in enums are capitalized". Improve readability of RAM register comment by making whole sentences. Remove parentheses from register defines as they are only used for expressions and not constants. As there are no clear style for name of registers and bits in the kernel drivers, I suggest the following for at least this driver, but hopefully also other RTC drivers. Register name should follow this convention: [chip]_REG_[reg name] 0xXX Bit name should follow this convention, so it clearly states which chip register it's part of: [chip]_BIT_[reg name]_[bit name] BIT(X) Additionally I suggest bit defines are always placed right below its corresponding register define and using an extra tab indentation for the BIT(X) part. This will visually make it easy to see that bit defines are part of the complete register definition. Rename PCF2127_OSF to PCF2127_BIT_SC_OSF and move it right below PCF2127_REG_SC. This will improve readability of bit checks as it's easy to verify that it uses the correct register. Move end of line comments above register defines as it's more like a heading for 1 register define and up to 8 bit defines or a collection of registers that are close related like timestamp split across 6 registers. Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com> Link: https://lore.kernel.org/r/20190822131936.18772-2-bruno.thomsen@gmail.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-08-23rtc: pcf2127: convert to devm_rtc_allocate_deviceBruno Thomsen1-3/+4
This allows further improvement of the driver. Signed-off-by: Bruno Thomsen <bruno.thomsen@gmail.com> Link: https://lore.kernel.org/r/20190822131936.18772-1-bruno.thomsen@gmail.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-08-23rtc: sun6i: Add support for H6 RTCOndrej Jirman1-2/+38
RTC on H6 is mostly the same as on H5 and H3. It has slight differences mostly in features that are not yet supported by this driver. Some differences are already stated in the comments in existing code. One other difference is that H6 has extra bit in LOSC_CTRL_REG, called EXT_LOSC_EN to enable/disable external low speed crystal oscillator. It also has bit EXT_LOSC_STA in LOSC_AUTO_SWT_STA_REG, to check whether external low speed oscillator is working correctly. This patch adds support for enabling LOSC when necessary: - during reparenting - when probing the clock H6 also has capacbility to automatically reparent RTC clock from external crystal oscillator, to internal RC oscillator, if external oscillator fails. This is enabled by default. Disable it during probe. Signed-off-by: Ondrej Jirman <megous@megous.com> Reviewed-by: Chen-Yu Tsai <wens@csie.org> Link: https://lore.kernel.org/r/20190820151934.3860-3-megous@megous.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-08-23dt-bindings: rtc: sun6i: Add compatible for H6 RTCOndrej Jirman1-0/+13
RTC on H6 is similar to the one on H5 SoC, but incompatible in small details. See the driver for description of differences. For example H6 RTC needs to enable the external low speed oscillator. Add new compatible for this RTC. Signed-off-by: Ondrej Jirman <megous@megous.com> Link: https://lore.kernel.org/r/20190820151934.3860-2-megous@megous.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
2019-08-23rtc: fsl-ftm-alarm: add FTM alarm driverBiwen Li3-0/+353
For the platforms including LS1012A, LS1021A, LS1028A, LS1043A, LS1046A, LS1088A, LS208xA that has the FlexTimer module, implementing alarm functions within RTC subsystem to wakeup the system when system going to sleep (work with RCPM driver). Signed-off-by: Biwen Li <biwen.li@nxp.com> Link: https://lore.kernel.org/r/20190813030157.48590-1-biwen.li@nxp.com Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>