sysreset: implement PALMAS sysreset functions

PALMAS PMIC family has embedded poweroff function used by some
device to initiane device power off. Implement it as sysreset
driver.

Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>

drivers/sysreset/Kconfig

@@ -109,6 +109,13 @@ config SYSRESET_SPL_AT91
 	  This enables the system reset driver support for Microchip/Atmel
 	  SoCs in SPL.
 
+config SYSRESET_PALMAS
+	bool "Enable support for PALMAS System Reset"
+	depends on PMIC_PALMAS
+	select SYSRESET_CMD_POWEROFF if CMD_POWEROFF
+	help
+	  Enable system power management functions found in PLAMAS PMIC family.
+
 config SYSRESET_PSCI
 	bool "Enable support for PSCI System Reset"
 	depends on ARM_PSCI_FW

drivers/sysreset/Makefile

@@ -13,6 +13,7 @@ obj-$(CONFIG_$(SPL_TPL_)SYSRESET_MAX77663) += sysreset_max77663.o
 obj-$(CONFIG_SYSRESET_MPC83XX) += sysreset_mpc83xx.o
 obj-$(CONFIG_SYSRESET_MICROBLAZE) += sysreset_microblaze.o
 obj-$(CONFIG_SYSRESET_OCTEON) += sysreset_octeon.o
+obj-$(CONFIG_$(SPL_TPL_)SYSRESET_PALMAS) += sysreset_palmas.o
 obj-$(CONFIG_SYSRESET_PSCI) += sysreset_psci.o
 obj-$(CONFIG_SYSRESET_SBI) += sysreset_sbi.o
 obj-$(CONFIG_SYSRESET_SOCFPGA) += sysreset_socfpga.o

drivers/sysreset/sysreset_palmas.c

@@ -0,0 +1,52 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Copyright(C) 2023 Svyatoslav Ryhel <clamor95@gmail.com>
+ */
+
+#include <dm.h>
+#include <i2c.h>
+#include <errno.h>
+#include <sysreset.h>
+#include <power/pmic.h>
+#include <power/palmas.h>
+
+static int palmas_sysreset_request(struct udevice *dev,
+				   enum sysreset_t type)
+{
+	struct palmas_priv *priv = dev_get_priv(dev->parent);
+	int ret;
+
+	/*
+	 * Mask INT3 on second page which detects vbus
+	 * or device will immediately turn on.
+	 */
+	ret = dm_i2c_reg_clrset(priv->chip2, PALMAS_INT3_MASK,
+				MASK_VBUS, MASK_VBUS);
+	if (ret < 0)
+		return ret;
+
+	switch (type) {
+	case SYSRESET_POWER:
+		/* PALMAS: SW_RST > DEV_CTRL */
+		pmic_reg_write(dev->parent, PALMAS_DEV_CTRL, SW_RST);
+		break;
+	case SYSRESET_POWER_OFF:
+		/* PALMAS: DEV_OFF > DEV_CTRL */
+		pmic_reg_write(dev->parent, PALMAS_DEV_CTRL, DEV_OFF);
+		break;
+	default:
+		return -EPROTONOSUPPORT;
+	}
+
+	return -EINPROGRESS;
+}
+
+static struct sysreset_ops palmas_sysreset = {
+	.request = palmas_sysreset_request,
+};
+
+U_BOOT_DRIVER(sysreset_palmas) = {
+	.id	= UCLASS_SYSRESET,
+	.name	= PALMAS_RST_DRIVER,
+	.ops	= &palmas_sysreset,
+};