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rtc: ds1307: Detect oscillator fail on mcp794xx

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

Co-developed-by: Szentendrei, Tamás <szentendrei.tamas@prolan.hu>
Signed-off-by: Szentendrei, Tamás <szentendrei.tamas@prolan.hu>
Signed-off-by: Csókás, Bence <csokas.bence@prolan.hu>
Link: https://lore.kernel.org/r/20240611072411.671600-1-csokas.bence@prolan.hu
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
This commit is contained in:
Csókás, Bence 2024-06-11 09:24:08 +02:00 committed by Alexandre Belloni
parent 43696b3a9e
commit 35a34f09ba
1 changed files with 5 additions and 0 deletions
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5
drivers/rtc/rtc-ds1307.c
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@ -65,6 +65,7 @@ enum ds_type {
# define DS1340_BIT_CENTURY_EN 0x80 /* in REG_HOUR */ # define DS1340_BIT_CENTURY_EN 0x80 /* in REG_HOUR */
# define DS1340_BIT_CENTURY 0x40 /* in REG_HOUR */ # define DS1340_BIT_CENTURY 0x40 /* in REG_HOUR */
#define DS1307_REG_WDAY 0x03 /* 01-07 */ #define DS1307_REG_WDAY 0x03 /* 01-07 */
# define MCP794XX_BIT_OSCRUN BIT(5)
# define MCP794XX_BIT_VBATEN 0x08 # define MCP794XX_BIT_VBATEN 0x08
#define DS1307_REG_MDAY 0x04 /* 01-31 */ #define DS1307_REG_MDAY 0x04 /* 01-31 */
#define DS1307_REG_MONTH 0x05 /* 01-12 */ #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) { regs[DS1307_REG_MIN] & M41T0_BIT_OF) {
dev_warn_once(dev, "oscillator failed, set time!\n"); dev_warn_once(dev, "oscillator failed, set time!\n");
return -EINVAL; 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]; tmp = regs[DS1307_REG_SECS];