[PATCH v1 2/9] power: pmic: add the base MAX8907 PMIC support

[Svyatoslav Ryhel]

Add basic i2c based read/write functions to access PMIC registers.

Tested-by: Ion Agorria <ion at agorria.com>
Signed-off-by: Svyatoslav Ryhel <clamor95 at gmail.com>
---
 drivers/power/pmic/Kconfig   |  9 ++++++
 drivers/power/pmic/Makefile  |  1 +
 drivers/power/pmic/max8907.c | 53 ++++++++++++++++++++++++++++++++++++
 3 files changed, 63 insertions(+)
 create mode 100644 drivers/power/pmic/max8907.c

diff --git a/drivers/power/pmic/Kconfig b/drivers/power/pmic/Kconfig
index 5a61cd45b8c..ec7ccc3a63f 100644
--- a/drivers/power/pmic/Kconfig
+++ b/drivers/power/pmic/Kconfig
@@ -184,6 +184,15 @@ config SPL_DM_PMIC_PFUZE100
 	This config enables implementation of driver-model pmic uclass features
 	for PMIC PFUZE100 in SPL. The driver implements read/write operations.
 
+config DM_PMIC_MAX8907
+	bool "Enable Driver Model for PMIC MAX8907"
+	---help---
+	This config enables implementation of driver-model pmic uclass features
+	for PMIC MAX8907. The driver implements read/write operations.
+	This is a Power Management IC with a decent set of peripherals from which
+	3 DC-to-DC Step-Down (SD) Regulators, 20 Low-Dropout Linear (LDO) Regulators,
+	Real-Time Clock (RTC) and more with I2C Compatible Interface.
+
 config DM_PMIC_MAX77663
 	bool "Enable Driver Model for PMIC MAX77663"
 	---help---
diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index 2210b1a64ae..6bebffb05a6 100644
--- a/drivers/power/pmic/Makefile
+++ b/drivers/power/pmic/Makefile
@@ -7,6 +7,7 @@ obj-$(CONFIG_$(PHASE_)DM_PMIC) += pmic-uclass.o
 obj-$(CONFIG_$(PHASE_)DM_PMIC_FAN53555) += fan53555.o
 obj-$(CONFIG_$(PHASE_)DM_PMIC_DA9063) += da9063.o
 obj-$(CONFIG_$(PHASE_)DM_PMIC_MAX77663) += max77663.o
+obj-$(CONFIG_$(PHASE_)DM_PMIC_MAX8907) += max8907.o
 obj-$(CONFIG_DM_PMIC_MAX77686) += max77686.o
 obj-$(CONFIG_DM_PMIC_MAX8998) += max8998.o
 obj-$(CONFIG_DM_PMIC_MC34708) += mc34708.o
diff --git a/drivers/power/pmic/max8907.c b/drivers/power/pmic/max8907.c
new file mode 100644
index 00000000000..aeb6fe734e6
--- /dev/null
+++ b/drivers/power/pmic/max8907.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Copyright(C) 2024 Svyatoslav Ryhel <clamor95 at gmail.com>
+ */
+
+#include <dm.h>
+#include <dm/lists.h>
+#include <power/pmic.h>
+
+static int max8907_write(struct udevice *dev, uint reg, const uint8_t *buff, int len)
+{
+	int ret;
+
+	ret = dm_i2c_write(dev, reg, buff, len);
+	if (ret) {
+		log_debug("%s: write error to device: %p register: %#x!\n",
+			  __func__, dev, reg);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int max8907_read(struct udevice *dev, uint reg, uint8_t *buff, int len)
+{
+	int ret;
+
+	ret = dm_i2c_read(dev, reg, buff, len);
+	if (ret) {
+		log_debug("%s: read error from device: %p register: %#x!\n",
+			  __func__, dev, reg);
+		return ret;
+	}
+
+	return 0;
+}
+
+static struct dm_pmic_ops max8907_ops = {
+	.read = max8907_read,
+	.write = max8907_write,
+};
+
+static const struct udevice_id max8907_ids[] = {
+	{ .compatible = "maxim,max8907" },
+	{ }
+};
+
+U_BOOT_DRIVER(pmic_max8907) = {
+	.name = "max8907_pmic",
+	.id = UCLASS_PMIC,
+	.of_match = max8907_ids,
+	.ops = &max8907_ops,
+};
-- 
2.43.0