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power: pmic: pca9450: Add support for system reset

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The family of PCA9450 PMICs have the ability to perform system resets.
Restarting via PMIC is preferred method of restarting the system as all
the peripherals are brought to a know state after a power-cycle. The
PCA9450 features a cold restart procedure which is initiated by an I2C
command 0x14 to the SW_RST register.

Support in Linux for restarting via PCA9450 PMIC has been added by
Linux commit 6157e62b07d9 ("regulator: pca9450: Add restart handler").

Now add support for it also in the U-Boot via sysreset framework.

Signed-off-by: Primoz Fiser <primoz.fiser@norik.com>
Reviewed-by: Paul Geurts <paul.geurts@prodrive-technologies.com>
Signed-off-by: Peng Fan <peng.fan@nxp.com>
This commit is contained in:
Primoz Fiser 2025-08-28 13:24:04 +02:00 committed by Peng Fan
parent a65798ddbb
commit 9065b87f35
2 changed files with 46 additions and 0 deletions
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44
drivers/power/pmic/pca9450.c
View File

@ -6,13 +6,17 @@
#include <fdtdec.h>
#include <errno.h>
#include <dm.h>
#include <dm/device_compat.h>
#include <dm/lists.h>
#include <i2c.h>
#include <log.h>
#include <asm/global_data.h>
#include <linux/delay.h>
#include <linux/printk.h>
#include <power/pmic.h>
#include <power/regulator.h>
#include <power/pca9450.h>
#include <sysreset.h>
DECLARE_GLOBAL_DATA_PTR;
@ -79,6 +83,15 @@ static int pca9450_bind(struct udevice *dev)
static int pca9450_probe(struct udevice *dev)
{
unsigned int reset_ctrl;
int ret;
if (CONFIG_IS_ENABLED(SYSRESET)) {
ret = device_bind_driver_to_node(dev, "pca9450_sysreset",
"pca9450_sysreset",
dev_ofnode(dev), NULL);
if (ret)
return ret;
}
if (ofnode_read_bool(dev_ofnode(dev), "nxp,wdog_b-warm-reset"))
reset_ctrl = PCA9450_PMIC_RESET_WDOG_B_CFG_WARM;
@ -112,3 +125,34 @@ U_BOOT_DRIVER(pmic_pca9450) = {
.probe = pca9450_probe,
.ops = &pca9450_ops,
};
#ifdef CONFIG_SYSRESET
static int pca9450_sysreset_request(struct udevice *dev, enum sysreset_t type)
{
u8 cmd = PCA9450_SW_RST_COLD_RST;
if (type != SYSRESET_COLD)
return -EPROTONOSUPPORT;
if (pmic_write(dev->parent, PCA9450_SW_RST, &cmd, 1)) {
dev_err(dev, "reset command failed\n");
} else {
/* tRESTART is 250ms, delay 300ms just to be sure */
mdelay(300);
/* Should not get here, warn if we do */
dev_warn(dev, "didn't respond to reset command\n");
}
return -EINPROGRESS;
}
static struct sysreset_ops pca9450_sysreset_ops = {
.request = pca9450_sysreset_request,
};
U_BOOT_DRIVER(pca9450_sysreset) = {
.name = "pca9450_sysreset",
.id = UCLASS_SYSRESET,
.ops = &pca9450_sysreset_ops,
};
#endif /* CONFIG_SYSRESET */

2
include/power/pca9450.h
View File

@ -75,4 +75,6 @@ enum {
#define PCA9450_PMIC_RESET_WDOG_B_CFG_WARM 0x40
#define PCA9450_PMIC_RESET_WDOG_B_CFG_COLD_LDO12 0x80
#define PCA9450_SW_RST_COLD_RST 0x14
#endif