sysreset: implement MAX9807 sysreset functions

MAX8907 PMIC has embedded poweroff function used by some device to initiane
device power off. Implement it as optional sysreset driver guarded by
kconfig option and system-power-controller device tree property.

Tested-by: Ion Agorria <ion@agorria.com>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

1 files changed, 37 insertions, 0 deletions

diff --git a/drivers/sysreset/sysreset_max8907.c b/drivers/sysreset/sysreset_max8907.c
new file mode 100644
index 00000000000..6f62af9bffe
--- /dev/null
+++ b/drivers/sysreset/sysreset_max8907.c
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Copyright(C) 2024 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#include <dm.h>
+#include <i2c.h>
+#include <errno.h>
+#include <sysreset.h>
+#include <power/pmic.h>
+#include <power/max8907.h>
+
+static int max8907_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+	switch (type) {
+	case SYSRESET_POWER:
+	case SYSRESET_POWER_OFF:
+		/* MAX8907: PWR_OFF > RESET_CNFG */
+		pmic_clrsetbits(dev->parent, MAX8907_REG_RESET_CNFG,
+				MASK_POWER_OFF, MASK_POWER_OFF);
+		break;
+	default:
+		return -EPROTONOSUPPORT;
+	}
+
+	return -EINPROGRESS;
+}
+
+static struct sysreset_ops max8907_sysreset = {
+	.request = max8907_sysreset_request,
+};
+
+U_BOOT_DRIVER(sysreset_max8907) = {
+	.id	= UCLASS_SYSRESET,
+	.name	= MAX8907_RST_DRIVER,
+	.ops	= &max8907_sysreset,
+};