[PATCH v2 4/7] pmic: Add Renesas RAA215300 PMIC driver

[Paul Barker]

The RZ/G2L SMARC module is powered via a Renesas RAA215300 PMIC which
provides several voltage converters, a real time clock (RTC) and reset
control. A basic driver is implemented for this device so that we can
read, write and dump the PMIC registers.

The raa215300_bind() function is added as a stub, binding of the
sysreset driver will be added in a later patch.

Additional features of this PMIC (such as reset control) may be
supported by future patches.

Signed-off-by: Paul Barker <paul.barker.ct at bp.renesas.com>
---
 configs/renesas_rzg2l_smarc_defconfig |  3 ++
 drivers/power/pmic/Kconfig            |  9 ++++++
 drivers/power/pmic/Makefile           |  1 +
 drivers/power/pmic/raa215300.c        | 41 +++++++++++++++++++++++++++
 4 files changed, 54 insertions(+)
 create mode 100644 drivers/power/pmic/raa215300.c

diff --git a/configs/renesas_rzg2l_smarc_defconfig b/configs/renesas_rzg2l_smarc_defconfig
index ad46297c6619..2cab79329db4 100644
--- a/configs/renesas_rzg2l_smarc_defconfig
+++ b/configs/renesas_rzg2l_smarc_defconfig
@@ -27,6 +27,7 @@ CONFIG_CMD_GPIO=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y
 CONFIG_CMD_PART=y
+CONFIG_CMD_PMIC=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_EXT4=y
 CONFIG_CMD_EXT4_WRITE=y
@@ -49,6 +50,8 @@ CONFIG_DM_I2C=y
 CONFIG_MMC_IO_VOLTAGE=y
 CONFIG_MMC_UHS_SUPPORT=y
 CONFIG_MMC_HS400_SUPPORT=y
+CONFIG_DM_PMIC=y
+CONFIG_PMIC_RAA215300=y
 CONFIG_DM_REGULATOR=y
 CONFIG_DM_REGULATOR_FIXED=y
 CONFIG_DM_REGULATOR_GPIO=y
diff --git a/drivers/power/pmic/Kconfig b/drivers/power/pmic/Kconfig
index 454a6e0cf87a..9b61b18e11fd 100644
--- a/drivers/power/pmic/Kconfig
+++ b/drivers/power/pmic/Kconfig
@@ -404,6 +404,15 @@ config PMIC_TPS65219
 	help
 	The TPS65219 is a PMIC containing a bunch of SMPS & LDOs.
 	This driver binds the pmic children.
+
+config PMIC_RAA215300
+	bool "Renesas RAA215300 PMIC driver"
+	depends on DM_PMIC
+	help
+	  The Renesas RAA215300 PMIC driver includes RTC support, system reset
+	  support and several voltage regulators. For now, this driver simply
+	  allows register access and will bind the sysreset driver
+	  (CONFIG_SYSRESET_RAA215300) if it is enabled.
 endif
 
 config PMIC_TPS65217
diff --git a/drivers/power/pmic/Makefile b/drivers/power/pmic/Makefile
index 55ee614364be..a2d59deeed8b 100644
--- a/drivers/power/pmic/Makefile
+++ b/drivers/power/pmic/Makefile
@@ -35,6 +35,7 @@ obj-$(CONFIG_PMIC_STPMIC1) += stpmic1.o
 obj-$(CONFIG_PMIC_TPS65217) += pmic_tps65217.o
 obj-$(CONFIG_PMIC_TPS65219) += tps65219.o
 obj-$(CONFIG_PMIC_TPS65941) += tps65941.o
+obj-$(CONFIG_PMIC_RAA215300) += raa215300.o
 obj-$(CONFIG_POWER_TPS65218) += pmic_tps65218.o
 
 ifeq ($(CONFIG_$(SPL_)POWER_LEGACY),y)
diff --git a/drivers/power/pmic/raa215300.c b/drivers/power/pmic/raa215300.c
new file mode 100644
index 000000000000..b93a0d3a084a
--- /dev/null
+++ b/drivers/power/pmic/raa215300.c
@@ -0,0 +1,41 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2023 Renesas Electronics Corporation
+ */
+
+#include <dm.h>
+#include <dm/device-internal.h>
+#include <dm/lists.h>
+#include <i2c.h>
+#include <power/pmic.h>
+
+#define RAA215300_REG_COUNT 0x80
+
+static int raa215300_reg_count(struct udevice *dev)
+{
+	return RAA215300_REG_COUNT;
+}
+
+static struct dm_pmic_ops raa215300_ops = {
+	.reg_count = raa215300_reg_count,
+	.read = dm_i2c_read,
+	.write = dm_i2c_write,
+};
+
+static const struct udevice_id raa215300_ids[] = {
+	{ .compatible = "renesas,raa215300" },
+	{ /* sentinel */ }
+};
+
+static int raa215300_bind(struct udevice *dev)
+{
+	return 0;
+}
+
+U_BOOT_DRIVER(raa215300_pmic) = {
+	.name = "raa215300_pmic",
+	.id = UCLASS_PMIC,
+	.of_match = raa215300_ids,
+	.bind = raa215300_bind,
+	.ops = &raa215300_ops,
+};
-- 
2.43.2