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>

5 files changed, 102 insertions, 2 deletions

diff --git a/drivers/power/pmic/palmas.c b/drivers/power/pmic/palmas.c
index b2e8a29..32f2a93 100644
--- a/drivers/power/pmic/palmas.c
+++ b/drivers/power/pmic/palmas.c
@@ -8,13 +8,13 @@
 #include <fdtdec.h>
 #include <errno.h>
 #include <dm.h>
+#include <dm/lists.h>
 #include <i2c.h>
 #include <log.h>
 #include <linux/printk.h>
 #include <power/pmic.h>
 #include <power/regulator.h>
 #include <power/palmas.h>
-#include <dm/device.h>
 
 static const struct pmic_child_info pmic_children_info[] = {
 	{ .prefix = "ldo", .driver = PALMAS_LDO_DRIVER },
@@ -47,7 +47,16 @@ static int palmas_bind(struct udevice *dev)
 {
 	ofnode pmic_node = ofnode_null(), regulators_node;
 	ofnode subnode;
-	int children;
+	int children, ret;
+
+	if (IS_ENABLED(CONFIG_SYSRESET_PALMAS)) {
+		ret = device_bind_driver(dev, PALMAS_RST_DRIVER,
+					 "sysreset", NULL);
+		if (ret) {
+			log_err("cannot bind SYSRESET (ret = %d)\n", ret);
+			return ret;
+		}
+	}
 
 	dev_for_each_subnode(subnode, dev) {
 		const char *name;
@@ -81,6 +90,24 @@ static int palmas_bind(struct udevice *dev)
 	return 0;
 }
 
+static int palmas_probe(struct udevice *dev)
+{
+	struct dm_i2c_chip *chip = dev_get_parent_plat(dev);
+	struct palmas_priv *priv = dev_get_priv(dev);
+	struct udevice *bus = dev_get_parent(dev);
+	u32 chip2_addr = chip->chip_addr + 1;
+	int ret;
+
+	/* Palmas PMIC is multi chip and chips are located in a row */
+	ret = i2c_get_chip(bus, chip2_addr, 1, &priv->chip2);
+	if (ret) {
+		log_err("cannot get second PMIC I2C chip (err %d)\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
 static struct dm_pmic_ops palmas_ops = {
 	.read = palmas_read,
 	.write = palmas_write,
@@ -98,5 +125,7 @@ U_BOOT_DRIVER(pmic_palmas) = {
 	.id = UCLASS_PMIC,
 	.of_match = palmas_ids,
 	.bind = palmas_bind,
+	.probe = palmas_probe,
 	.ops = &palmas_ops,
+	.priv_auto = sizeof(struct palmas_priv),
 };
diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index 659170d..0e52f99 100644
--- a/drivers/sysreset/Kconfig
+++ b/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
diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile
index 0d96a20..c9f1c62 100644
--- a/drivers/sysreset/Makefile
+++ b/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
diff --git a/drivers/sysreset/sysreset_palmas.c b/drivers/sysreset/sysreset_palmas.c
new file mode 100644
index 0000000..9e3aa40
--- /dev/null
+++ b/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,
+};
diff --git a/include/power/palmas.h b/include/power/palmas.h
index df5f15c..0a61205 100644
--- a/include/power/palmas.h
+++ b/include/power/palmas.h
@@ -2,6 +2,10 @@
 #define TPS659038	0x1
 #define TPS65917	0x2
 
+struct palmas_priv {
+	struct udevice *chip2;
+};
+
 /* I2C device address for pmic palmas */
 #define PALMAS_I2C_ADDR	(0x12 >> 1)
 #define PALMAS_LDO_NUM		11
@@ -10,6 +14,7 @@
 /* Drivers name */
 #define PALMAS_LDO_DRIVER     "palmas_ldo"
 #define PALMAS_SMPS_DRIVER    "palmas_smps"
+#define PALMAS_RST_DRIVER     "palmas_rst"
 
 #define PALMAS_SMPS_VOLT_MASK		0x7F
 #define PALMAS_SMPS_RANGE_MASK		0x80
@@ -24,3 +29,9 @@
 #define PALMAS_LDO_MODE_MASK	0x1
 #define PALMAS_LDO_STATUS_MASK	0x10
 #define PALMAS_LDO_BYPASS_EN	0x40
+
+#define PALMAS_DEV_CTRL			0xA0
+#define   SW_RST			BIT(1)
+#define   DEV_OFF			0x00
+#define PALMAS_INT3_MASK		0x1B
+#define   MASK_VBUS			BIT(7)