[PATCH v4 4/6] sysreset: implement TPS80031 sysreset functions

[Svyatoslav Ryhel]

TPS80031/TPS80032 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 <clamor95 at gmail.com>
---
 drivers/power/pmic/tps80031.c        | 12 +++++++-
 drivers/sysreset/Kconfig             |  8 ++++++
 drivers/sysreset/Makefile            |  1 +
 drivers/sysreset/sysreset_tps80031.c | 41 ++++++++++++++++++++++++++++
 include/power/tps80031.h             |  5 ++++
 5 files changed, 66 insertions(+), 1 deletion(-)
 create mode 100644 drivers/sysreset/sysreset_tps80031.c

diff --git a/drivers/power/pmic/tps80031.c b/drivers/power/pmic/tps80031.c
index c2b04fffdf..45e89ba5c9 100644
--- a/drivers/power/pmic/tps80031.c
+++ b/drivers/power/pmic/tps80031.c
@@ -9,6 +9,7 @@
 #include <dm.h>
 #include <i2c.h>
 #include <log.h>
+#include <dm/lists.h>
 #include <power/pmic.h>
 #include <power/regulator.h>
 #include <power/tps80031.h>
@@ -49,7 +50,16 @@ static int tps80031_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
 static int tps80031_bind(struct udevice *dev)
 {
 	ofnode regulators_node;
-	int children;
+	int children, ret;
+
+	if (IS_ENABLED(CONFIG_SYSRESET_TPS80031)) {
+		ret = device_bind_driver(dev, TPS80031_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)) {
diff --git a/drivers/sysreset/Kconfig b/drivers/sysreset/Kconfig
index bc35896101..cdb4ae2bb1 100644
--- a/drivers/sysreset/Kconfig
+++ b/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_TPS80031
+	bool "Enable support for TPS80031/TPS80032 PMIC System Reset"
+	depends on DM_PMIC_TPS80031
+	select SYSRESET_CMD_POWEROFF if CMD_POWEROFF
+	help
+	  Enable system power management functions found in TPS80031/TPS80032
+	  PMICs.
+
 config SYSRESET_SYSCON
 	bool "Enable support for mfd syscon reboot driver"
 	select REGMAP
diff --git a/drivers/sysreset/Makefile b/drivers/sysreset/Makefile
index c31f51c581..f62db899da 100644
--- a/drivers/sysreset/Makefile
+++ b/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_TPS80031) += sysreset_tps80031.o
 obj-$(CONFIG_SYSRESET_SYSCON) += sysreset_syscon.o
 obj-$(CONFIG_SYSRESET_WATCHDOG) += sysreset_watchdog.o
 obj-$(CONFIG_SYSRESET_RESETCTL) += sysreset_resetctl.o
diff --git a/drivers/sysreset/sysreset_tps80031.c b/drivers/sysreset/sysreset_tps80031.c
new file mode 100644
index 0000000000..ea35f48ebd
--- /dev/null
+++ b/drivers/sysreset/sysreset_tps80031.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Copyright(C) 2023 Svyatoslav Ryhel <clamor95 at gmail.com>
+ */
+
+#include <common.h>
+#include <dm.h>
+#include <i2c.h>
+#include <errno.h>
+#include <sysreset.h>
+#include <power/pmic.h>
+#include <power/tps80031.h>
+
+static int tps80031_sysreset_request(struct udevice *dev,
+				     enum sysreset_t type)
+{
+	switch (type) {
+	case SYSRESET_POWER:
+		/* TPS80031: SW_RESET > PHOENIX_DEV_ON */
+		pmic_reg_write(dev->parent, TPS80031_PHOENIX_DEV_ON, SW_RESET);
+		break;
+	case SYSRESET_POWER_OFF:
+		/* TPS80031: DEVOFF > PHOENIX_DEV_ON */
+		pmic_reg_write(dev->parent, TPS80031_PHOENIX_DEV_ON, DEVOFF);
+		break;
+	default:
+		return -EPROTONOSUPPORT;
+	}
+
+	return -EINPROGRESS;
+}
+
+static struct sysreset_ops tps80031_sysreset = {
+	.request = tps80031_sysreset_request,
+};
+
+U_BOOT_DRIVER(sysreset_tps80031) = {
+	.id	= UCLASS_SYSRESET,
+	.name	= TPS80031_RST_DRIVER,
+	.ops	= &tps80031_sysreset,
+};
diff --git a/include/power/tps80031.h b/include/power/tps80031.h
index c80692a8af..983c841bfe 100644
--- a/include/power/tps80031.h
+++ b/include/power/tps80031.h
@@ -12,6 +12,7 @@
 /* Drivers name */
 #define TPS80031_LDO_DRIVER		"tps80031_ldo"
 #define TPS80031_SMPS_DRIVER		"tps80031_smps"
+#define TPS80031_RST_DRIVER		"tps80031_rst"
 
 #define TPS80031_SMPS_OFFSET		0xe0
 #define TPS80031_OFFSET_FLAG		BIT(0)
@@ -35,6 +36,10 @@
 #define LDO_VOLT_MIN			1018000
 #define LDO_VOLT_BASE			916000
 
+#define TPS80031_PHOENIX_DEV_ON		0x25
+#define   SW_RESET			BIT(6)
+#define   DEVOFF			BIT(0)
+
 /* register groups */
 enum {
 	CTRL,
-- 
2.39.2