sysreset: implement TPS65910 sysreset functions

TPS65910/TPS65911 PMICs have embedded power control functions
used by some device to initiane device power off. Implement it as
sysreset driver.

Signed-off-by: Svyatoslav Ryhel <[email protected]>

drivers/power/pmic/pmic_tps65910_dm.c

@@ -5,6 +5,7 @@
 
 #include <common.h>
 #include <dm.h>
+#include <dm/lists.h>
 #include <i2c.h>
 #include <log.h>
 #include <linux/printk.h>
@@ -59,7 +60,16 @@ static int pmic_tps65910_bind(struct udevice *dev)
 	const struct pmic_child_info *tps6591x_children_info =
 			(struct pmic_child_info *)dev_get_driver_data(dev);
 	ofnode regulators_node;
-	int children;
+	int children, ret;
+
+	if (IS_ENABLED(CONFIG_SYSRESET_TPS65910)) {
+		ret = device_bind_driver(dev, TPS65910_RST_DRIVER,
+					 "sysreset", NULL);
+		if (ret) {
+			log_err("cannot bind SYSRESET (ret = %d)\n", ret);
+			return ret;
+		}
+	}
 
 	regulators_node = dev_read_subnode(dev, "regulators");
 	if (!ofnode_valid(regulators_node)) {

drivers/sysreset/Kconfig

@@ -157,6 +157,14 @@ config SYSRESET_TI_SCI
 	  This enables the system reset driver support over TI System Control
 	  Interface available on some new TI's SoCs.
 
+config SYSRESET_TPS65910
+	bool "Enable support for TPS65910/TPS65911 PMIC System Reset"
+	depends on DM_PMIC_TPS65910
+	select SYSRESET_CMD_POWEROFF if CMD_POWEROFF
+	help
+	  Enable system power management functions found in TPS65910/TPS65911
+	  PMICs.
+
 config SYSRESET_TPS80031
 	bool "Enable support for TPS80031/TPS80032 PMIC System Reset"
 	depends on DM_PMIC_TPS80031

drivers/sysreset/Makefile

@@ -19,6 +19,7 @@ obj-$(CONFIG_SYSRESET_SOCFPGA) += sysreset_socfpga.o
 obj-$(CONFIG_SYSRESET_SOCFPGA_SOC64) += sysreset_socfpga_soc64.o
 obj-$(CONFIG_SYSRESET_TEGRA) += sysreset_tegra.o
 obj-$(CONFIG_SYSRESET_TI_SCI) += sysreset-ti-sci.o
+obj-$(CONFIG_$(SPL_TPL_)SYSRESET_TPS65910) += sysreset_tps65910.o
 obj-$(CONFIG_$(SPL_TPL_)SYSRESET_TPS80031) += sysreset_tps80031.o
 obj-$(CONFIG_SYSRESET_SYSCON) += sysreset_syscon.o
 obj-$(CONFIG_SYSRESET_WATCHDOG) += sysreset_watchdog.o

drivers/sysreset/sysreset_tps65910.c

@@ -0,0 +1,55 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Copyright(C) 2023 Svyatoslav Ryhel <[email protected]>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <i2c.h>
+#include <errno.h>
+#include <sysreset.h>
+#include <power/pmic.h>
+#include <power/tps65910_pmic.h>
+
+static int tps65910_sysreset_request(struct udevice *dev,
+				     enum sysreset_t type)
+{
+	int val;
+
+	val = pmic_reg_read(dev->parent, TPS65910_REG_DEVICE_CTRL);
+	if (val < 0)
+		return val;
+
+	/* define power-off to be sequential */
+	val |= PWR_OFF_SEQ;
+	pmic_reg_write(dev->parent, TPS65910_REG_DEVICE_CTRL, val);
+
+	val &= ~DEV_ON;
+
+	switch (type) {
+	case SYSRESET_POWER:
+		/* TPS65910: DEV_OFF_RST > DEVICE_CTRL */
+		pmic_reg_write(dev->parent, TPS65910_REG_DEVICE_CTRL,
+			       val | DEV_OFF_RST);
+		break;
+	case SYSRESET_POWER_OFF:
+		/* TPS65910: DEV_OFF > DEVICE_CTRL */
+		pmic_reg_write(dev->parent, TPS65910_REG_DEVICE_CTRL,
+			       val | DEV_OFF);
+		break;
+	default:
+		return -EPROTONOSUPPORT;
+	}
+
+	return -EINPROGRESS;
+}
+
+static struct sysreset_ops tps65910_sysreset = {
+	.request = tps65910_sysreset_request,
+};
+
+U_BOOT_DRIVER(sysreset_tps65910) = {
+	.id	= UCLASS_SYSRESET,
+	.name	= TPS65910_RST_DRIVER,
+	.ops	= &tps65910_sysreset,
+};

include/power/tps65910_pmic.h

@@ -17,6 +17,12 @@
 #define TPS65910_SUPPLY_STATE_OFF	0x0
 #define TPS65910_SUPPLY_STATE_ON	0x1
 
+/* TPS65910 DEVICE_CTRL bits */
+#define   PWR_OFF_SEQ			BIT(7)
+#define   DEV_OFF_RST			BIT(3)
+#define   DEV_ON			BIT(2)
+#define   DEV_OFF			BIT(0)
+
 /* i2c registers */
 enum {
 	TPS65910_REG_RTC_SEC			= 0x00,
@@ -125,6 +131,7 @@ struct tps65910_regulator_pdata {
 #define TPS65910_BUCK_DRIVER	"tps65910_buck"
 #define TPS65910_BOOST_DRIVER	"tps65910_boost"
 #define TPS65910_LDO_DRIVER	"tps65910_ldo"
+#define TPS65910_RST_DRIVER	"tps65910_rst"
 
 /* tps65911 i2c registers */
 enum {