From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
Renesas VBATTB IP has logic to control the RTC clock, tamper detection
and a small 128B memory. Add a MFD driver to do the basic initialization
of the VBATTB IP for the inner components to work.
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
---
Changes in v2:
- none; this driver is new
drivers/mfd/Kconfig | 8 ++++
drivers/mfd/Makefile | 1 +
drivers/mfd/renesas-vbattb.c | 78 ++++++++++++++++++++++++++++++++++++
3 files changed, 87 insertions(+)
create mode 100644 drivers/mfd/renesas-vbattb.c
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index bc8be2e593b6..df93e8b05065 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -1383,6 +1383,14 @@ config MFD_SC27XX_PMIC
This driver provides common support for accessing the SC27xx PMICs,
and it also adds the irq_chip parts for handling the PMIC chip events.
+config MFD_RENESAS_VBATTB
+ tristate "Renesas VBATTB driver"
+ depends on (ARCH_RZG2L && OF) || COMPILE_TEST
+ select MFD_CORE
+ help
+ Select this option to enable Renesas RZ/G3S VBATTB driver which
+ provides support for the RTC clock, tamper detector and 128B SRAM.
+
config RZ_MTU3
tristate "Renesas RZ/G2L MTU3a core driver"
depends on (ARCH_RZG2L && OF) || COMPILE_TEST
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 02b651cd7535..cd2f27492df2 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -186,6 +186,7 @@ pcf50633-objs := pcf50633-core.o pcf50633-irq.o
obj-$(CONFIG_MFD_PCF50633) += pcf50633.o
obj-$(CONFIG_PCF50633_ADC) += pcf50633-adc.o
obj-$(CONFIG_PCF50633_GPIO) += pcf50633-gpio.o
+obj-$(CONFIG_MFD_RENESAS_VBATTB) += renesas-vbattb.o
obj-$(CONFIG_RZ_MTU3) += rz-mtu3.o
obj-$(CONFIG_ABX500_CORE) += abx500-core.o
obj-$(CONFIG_MFD_DB8500_PRCMU) += db8500-prcmu.o
diff --git a/drivers/mfd/renesas-vbattb.c b/drivers/mfd/renesas-vbattb.c
new file mode 100644
index 000000000000..5d71565b8cbf
--- /dev/null
+++ b/drivers/mfd/renesas-vbattb.c
@@ -0,0 +1,78 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * VBATTB driver
+ *
+ * Copyright (C) 2024 Renesas Electronics Corp.
+ */
+
+#include <linux/mod_devicetable.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/reset.h>
+
+static int vbattb_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct reset_control *rstc;
+ int ret;
+
+ rstc = devm_reset_control_array_get_exclusive(dev);
+ if (IS_ERR(rstc))
+ return PTR_ERR(rstc);
+
+ ret = devm_pm_runtime_enable(dev);
+ if (ret)
+ return ret;
+
+ ret = pm_runtime_resume_and_get(dev);
+ if (ret)
+ return ret;
+
+ ret = reset_control_deassert(rstc);
+ if (ret)
+ goto rpm_put;
+
+ platform_set_drvdata(pdev, rstc);
+
+ ret = devm_of_platform_populate(dev);
+ if (ret)
+ goto reset_assert;
+
+ return 0;
+
+reset_assert:
+ reset_control_assert(rstc);
+rpm_put:
+ pm_runtime_put(dev);
+ return ret;
+}
+
+static void vbattb_remove(struct platform_device *pdev)
+{
+ struct reset_control *rstc = platform_get_drvdata(pdev);
+
+ reset_control_assert(rstc);
+ pm_runtime_put(&pdev->dev);
+}
+
+static const struct of_device_id vbattb_match[] = {
+ { .compatible = "renesas,r9a08g045-vbattb" },
+ { /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, vbattb_match);
+
+static struct platform_driver vbattb_driver = {
+ .probe = vbattb_probe,
+ .remove_new = vbattb_remove,
+ .driver = {
+ .name = "renesas-vbattb",
+ .of_match_table = vbattb_match,
+ },
+};
+module_platform_driver(vbattb_driver);
+
+MODULE_ALIAS("platform:renesas-vbattb");
+MODULE_AUTHOR("Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION("Renesas VBATTB driver");
+MODULE_LICENSE("GPL");
--
2.39.2
