Commit 35a34f09 authored by Bence Csókás's avatar Bence Csókás Committed by Alexandre Belloni
Browse files

rtc: ds1307: Detect oscillator fail on mcp794xx 



This patch enables the detection of the oscillator failure on mcp794xx chips.

Co-developed-by: default avatarSzentendrei, Tamás <szentendrei.tamas@prolan.hu>
Signed-off-by: default avatarSzentendrei, Tamás <szentendrei.tamas@prolan.hu>
Signed-off-by: default avatarCsókás, Bence <csokas.bence@prolan.hu>
Link: https://lore.kernel.org/r/20240611072411.671600-1-csokas.bence@prolan.hu


Signed-off-by: default avatarAlexandre Belloni <alexandre.belloni@bootlin.com>
parent 43696b3a

drivers/rtc/rtc-ds1307.c

+5 −0
Original line number Diff line number Diff line
@@ -65,6 +65,7 @@ enum ds_type { 
#	define DS1340_BIT_CENTURY_EN	0x80	/* in REG_HOUR */

#	define DS1340_BIT_CENTURY	0x40	/* in REG_HOUR */

#define DS1307_REG_WDAY		0x03	/* 01-07 */

#	define MCP794XX_BIT_OSCRUN	BIT(5)

#	define MCP794XX_BIT_VBATEN	0x08

#define DS1307_REG_MDAY		0x04	/* 01-31 */

#define DS1307_REG_MONTH	0x05	/* 01-12 */
@@ -242,6 +243,10 @@ static int ds1307_get_time(struct device *dev, struct rtc_time *t) 
	    regs[DS1307_REG_MIN] & M41T0_BIT_OF) {

		dev_warn_once(dev, "oscillator failed, set time!\n");

		return -EINVAL;

	} else if (ds1307->type == mcp794xx &&

	    !(regs[DS1307_REG_WDAY] & MCP794XX_BIT_OSCRUN)) {

		dev_warn_once(dev, "oscillator failed, set time!\n");

		return -EINVAL;

	}



	tmp = regs[DS1307_REG_SECS];