[PATCH] drivers: pmic: Add sysreset driver to da9063 pmic device

[Alexandre Ghiti <alexandre.ghiti@canonical.com>]

This pmic device is present on the SiFive Unmatched board and this
new driver adds the possibility to reset it.

Signed-off-by: Alexandre Ghiti <alexandre.ghiti@canonical.com>
---
 configs/sifive_unmatched_defconfig |  2 ++
 drivers/power/pmic/da9063.c        | 49 ++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)

diff --git a/configs/sifive_unmatched_defconfig b/configs/sifive_unmatched_defconfig
index 978818b688..9ab058be39 100644
--- a/configs/sifive_unmatched_defconfig
+++ b/configs/sifive_unmatched_defconfig
@@ -43,3 +43,5 @@ CONFIG_DM_USB=y
 CONFIG_USB_XHCI_HCD=y
 CONFIG_USB_XHCI_PCI=y
 CONFIG_BOARD_EARLY_INIT_F=y
+CONFIG_DM_PMIC=y
+CONFIG_DM_PMIC_DA9063=y
diff --git a/drivers/power/pmic/da9063.c b/drivers/power/pmic/da9063.c
index 25101d18f7..b04879d9c5 100644
--- a/drivers/power/pmic/da9063.c
+++ b/drivers/power/pmic/da9063.c
@@ -10,6 +10,7 @@
 #include <dm.h>
 #include <i2c.h>
 #include <log.h>
+#include <dm/lists.h>
 #include <power/pmic.h>
 #include <power/regulator.h>
 #include <power/da9063_pmic.h>
@@ -87,6 +88,7 @@ static int da9063_bind(struct udevice *dev)
 {
 	ofnode regulators_node;
 	int children;
+	int ret;
 
 	regulators_node = dev_read_subnode(dev, "regulators");
 	if (!ofnode_valid(regulators_node)) {
@@ -101,6 +103,14 @@ static int da9063_bind(struct udevice *dev)
 	if (!children)
 		debug("%s: %s - no child found\n", __func__, dev->name);
 
+	if (CONFIG_IS_ENABLED(SYSRESET)) {
+		ret = device_bind_driver(dev, "da9063-sysreset",
+					 "da9063-sysreset", NULL);
+		if (ret)
+			debug("%s: %s - failed to bind sysreset driver\n",
+			      __func__, dev->name);
+	}
+
 	/* Always return success for this device */
 	return 0;
 }
@@ -129,3 +139,42 @@ U_BOOT_DRIVER(pmic_da9063) = {
 	.probe = da9063_probe,
 	.ops = &da9063_ops,
 };
+
+#ifdef CONFIG_SYSRESET
+#include <sysreset.h>
+
+static int da9063_sysreset_request(struct udevice *dev, enum sysreset_t type)
+{
+	struct udevice *pmic_dev = dev->parent;
+	uint ret;
+
+	if (type != SYSRESET_WARM && type != SYSRESET_COLD)
+		return -EPROTONOSUPPORT;
+
+	ret = pmic_reg_write(pmic_dev, DA9063_REG_PAGE_CON, 0x00);
+	if (ret < 0)
+		return ret;
+
+	/* Sets the WAKE_UP bit */
+	ret = pmic_reg_write(pmic_dev, DA9063_REG_CONTROL_F, 0x04);
+	if (ret < 0)
+		return ret;
+
+	/* Powerdown! */
+	ret = pmic_reg_write(pmic_dev, DA9063_REG_CONTROL_A, 0x68);
+	if (ret < 0)
+		return ret;
+
+	return -EINPROGRESS;
+}
+
+static struct sysreset_ops da9063_sysreset_ops = {
+	.request = da9063_sysreset_request,
+};
+
+U_BOOT_DRIVER(da9063_sysreset) = {
+	.name = "da9063-sysreset",
+	.id = UCLASS_SYSRESET,
+	.ops = &da9063_sysreset_ops,
+};
+#endif
-- 
2.30.2