drivers/rtc/rtc-dm355evm.c

1 // SPDX-License-Identifier: GPL-2.0+
3  * rtc-dm355evm.c - access battery-backed counter in MSP430 firmware
19  * reasonable RTC for applications where alarms and non-NTP drift
22  * The only real glitch is the inability to read or write all four
41 		 * Read LSB(0) to MSB(3) bytes.  Defend against the counter  in dm355evm_rtc_read_time()
42 		 * rolling over by re-reading until the value is stable,  in dm355evm_rtc_read_time()
75 	dev_dbg(dev, "read timestamp %08x\n", time.value);  in dm355evm_rtc_read_time()
93 	 * REVISIT handle non-atomic writes ... maybe just retry until  in dm355evm_rtc_set_time()
94 	 * byte[1] sticks (no rollover)?  in dm355evm_rtc_set_time()
120 /*----------------------------------------------------------------------*/
126 	rtc = devm_rtc_allocate_device(&pdev->dev);  in dm355evm_rtc_probe()
132 	rtc->ops = &dm355evm_rtc_ops;  in dm355evm_rtc_probe()
133 	rtc->range_max = U32_MAX;  in dm355evm_rtc_probe()
145 		.name	= "rtc-dm355evm",