> PCA9450 PMIC supports reading the reset status from the PWRON_STAT > register. Bits 7-4 give indication of the PMIC reset cause: > > - PWRON (BIT7) - Power ON triggered by PMIC_ON_REQ input line, > - WDOGB (BIT6) - Boot after cold reset by WDOGB pin (watchdog reset), > - SW_RST (BIT5) - Boot after cold reset initiated by the software, > - PMIC_RST (BIT4) - Boot after PMIC_RST_B input line trigger. > > Add support for reading reset status via the sysreset framework in a > convenient printable format. > > Signed-off-by: Primoz Fiser <primoz.fi...@norik.com>
Reviewed-by: Paul Geurts <paul.geu...@prodrive-technologies.com> > --- > Change in v2: > - new patch as suggested by Paul Geurts > > Link to v1: > https://lore.kernel.org/all/20250716114547.1343797-1-primoz.fi...@norik.com/ > > drivers/power/pmic/pca9450.c | 38 ++++++++++++++++++++++++++++++++++++ > include/power/pca9450.h | 5 +++++ > 2 files changed, 43 insertions(+) > > diff --git a/drivers/power/pmic/pca9450.c b/drivers/power/pmic/pca9450.c > index abc39d0a1946..24426df1a49f 100644 > --- a/drivers/power/pmic/pca9450.c > +++ b/drivers/power/pmic/pca9450.c > @@ -166,8 +166,46 @@ static int pca9450_sysreset_request(struct udevice *dev, > enum sysreset_t type) > return -EINPROGRESS; > } > > +int pca9450_sysreset_get_status(struct udevice *dev, char *buf, int size) > +{ > + const char *reason; > + int ret; > + u8 reg; > + > + ret = pmic_read(dev->parent, PCA9450_PWRON_STAT, ®, 1); > + if (ret) > + return ret; > + > + switch (reg) { > + case PCA9450_PWRON_STAT_PWRON_MASK: > + reason = "PWRON"; > + break; > + case PCA9450_PWRON_STAT_WDOG_MASK: > + reason = "WDOGB"; > + break; > + case PCA9450_PWRON_STAT_SW_RST_MASK: > + reason = "SW_RST"; > + break; > + case PCA9450_PWRON_STAT_PMIC_RST_MASK: > + reason = "PMIC_RST"; > + break; > + default: > + reason = "UNKNOWN"; > + break; > + } > + > + ret = snprintf(buf, size, "Reset Status: %s\n", reason); > + if (ret < 0) { > + dev_err(dev, "Write reset status error (err = %d)\n", ret); > + return -EIO; > + } > + > + return 0; > +} > + > static struct sysreset_ops pca9450_sysreset_ops = { > .request = pca9450_sysreset_request, > + .get_status = pca9450_sysreset_get_status, > }; > > U_BOOT_DRIVER(pca9450_sysreset) = { > diff --git a/include/power/pca9450.h b/include/power/pca9450.h > index 9119ef793b1f..41b7f95c0340 100644 > --- a/include/power/pca9450.h > +++ b/include/power/pca9450.h > @@ -75,6 +75,11 @@ enum { > #define PCA9450_PMIC_RESET_WDOG_B_CFG_WARM 0x40 > #define PCA9450_PMIC_RESET_WDOG_B_CFG_COLD_LDO12 0x80 > > +#define PCA9450_PWRON_STAT_PWRON_MASK 0x80 > +#define PCA9450_PWRON_STAT_WDOG_MASK 0x40 > +#define PCA9450_PWRON_STAT_SW_RST_MASK 0x20 > +#define PCA9450_PWRON_STAT_PMIC_RST_MASK 0x10 > + > #define PCA9450_SW_RST_COLD_RST 0x14 > > #endif > -- > 2.34.1 br, Paul
