linux-kernel - [PATCH v12 2/3] mfd: sophgo: cv1800: rtcsys: New driver (handling RTC only)

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Message-ID: <20250302195205.3183174-3-alexander.sverdlin@gmail.com>
Date: Sun,  2 Mar 2025 20:51:55 +0100
From: Alexander Sverdlin <alexander.sverdlin@...il.com>
To: devicetree@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	linux-rtc@...r.kernel.org
Cc: Alexander Sverdlin <alexander.sverdlin@...il.com>,
	Inochi Amaoto <inochiama@...il.com>,
	dlan@...too.org,
	linux-kernel@...r.kernel.org,
	Jingbao Qiu <qiujingbao.dlmu@...il.com>,
	Lee Jones <lee@...nel.org>,
	Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Chen Wang <unicorn_wang@...look.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>,
	Alexandre Belloni <alexandre.belloni@...tlin.com>,
	sophgo@...ts.linux.dev
Subject: [PATCH v12 2/3] mfd: sophgo: cv1800: rtcsys: New driver (handling RTC only)

Add driver for Sophgo CV1800 series SoC RTC MFD. The RTC module comprises
a 32kHz oscillator, Power-on-Reset (PoR) sub-module, HW state machine to
control chip power-on, power-off and reset. Furthermore, the 8051 subsystem
is located within RTCSYS including associated SRAM block.

This patch only populates RTC sub-device.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@...il.com>
---
Changelog:
v12:
- new patch

 MAINTAINERS                 |  1 +
 drivers/mfd/Kconfig         | 14 ++++++++
 drivers/mfd/Makefile        |  1 +
 drivers/mfd/cv1800-rtcsys.c | 66 +++++++++++++++++++++++++++++++++++++
 4 files changed, 82 insertions(+)
 create mode 100644 drivers/mfd/cv1800-rtcsys.c

diff --git a/MAINTAINERS b/MAINTAINERS
index 92fc0eca7061..446156998380 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -22185,6 +22185,7 @@ M:	Chen Wang <unicorn_wang@...look.com>
 M:	Inochi Amaoto <inochiama@...look.com>
 T:	git https://github.com/sophgo/linux.git
 S:	Maintained
+F:	drivers/mfd/cv1800-rtcsys.c
 N:	sophgo
 K:	sophgo
 
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 6b0682af6e32..842cc4d95c4b 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -285,6 +285,20 @@ config MFD_CS42L43_SDW
 	  Select this to support the Cirrus Logic CS42L43 PC CODEC with
 	  headphone and class D speaker drivers over SoundWire.
 
+config MFD_CV1800_RTCSYS
+	tristate "Sophgo CV1800 RTC MFD"
+	depends on ARCH_SOPHGO || COMPILE_TEST
+	select MFD_CORE
+	help
+	  If you say yes here you get support the RTC MFD driver for Sophgo
+	  CV1800 series SoC. The RTC module comprises a 32kHz oscillator,
+	  Power-on-Reset (PoR) sub-module, HW state machine to control chip
+	  power-on, power-off and reset. Furthermore, the 8051 subsystem is
+	  located within RTCSYS including associated SRAM block.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called cv1800-rtcsys.
+
 config MFD_MADERA
 	tristate "Cirrus Logic Madera codecs"
 	select MFD_CORE
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index 9220eaf7cf12..3cf03ffeedbb 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -18,6 +18,7 @@ obj-$(CONFIG_MFD_CROS_EC_DEV)	+= cros_ec_dev.o
 obj-$(CONFIG_MFD_CS42L43)	+= cs42l43.o
 obj-$(CONFIG_MFD_CS42L43_I2C)	+= cs42l43-i2c.o
 obj-$(CONFIG_MFD_CS42L43_SDW)	+= cs42l43-sdw.o
+obj-$(CONFIG_MFD_CV1800_RTCSYS)	+= cv1800-rtcsys.o
 obj-$(CONFIG_MFD_ENE_KB3930)	+= ene-kb3930.o
 obj-$(CONFIG_MFD_EXYNOS_LPASS)	+= exynos-lpass.o
 obj-$(CONFIG_MFD_GATEWORKS_GSC)	+= gateworks-gsc.o
diff --git a/drivers/mfd/cv1800-rtcsys.c b/drivers/mfd/cv1800-rtcsys.c
new file mode 100644
index 000000000000..72d11284f1de
--- /dev/null
+++ b/drivers/mfd/cv1800-rtcsys.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Sophgo CV1800 series SoC RTC MFD
+ *
+ * The RTC module comprises a 32kHz oscillator, Power-on-Reset (PoR) sub-module,
+ * HW state machine to control chip power-on, power-off and reset. Furthermore,
+ * the 8051 subsystem is located within RTCSYS including associated SRAM block.
+ *
+ * Copyright (C) 2025 Alexander Sverdlin <alexander.sverdlin@...il.com>
+ *
+ */
+
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/property.h>
+
+static struct resource cv1800_rtcsys_irq_resources[] = {
+	DEFINE_RES_IRQ_NAMED(0, "alarm"),
+};
+
+static const struct mfd_cell cv1800_rtcsys_subdev[] = {
+	{
+		.name = "cv1800-rtc",
+		.num_resources = 1,
+		.resources = &cv1800_rtcsys_irq_resources[0],
+	},
+};
+
+static const struct mfd_cell cv1800_rtcsys_rtc_subdev =
+	MFD_CELL_NAME("cv1800-rtc");
+
+static int cv1800_rtcsys_probe(struct platform_device *pdev)
+{
+	int irq;
+
+	irq = platform_get_irq_byname(pdev, "alarm");
+	if (irq < 0)
+		return irq;
+	cv1800_rtcsys_irq_resources[0].start = irq;
+	cv1800_rtcsys_irq_resources[0].end = irq;
+
+	return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
+				    cv1800_rtcsys_subdev,
+				    ARRAY_SIZE(cv1800_rtcsys_subdev),
+				    NULL, 0, NULL);
+}
+
+static const struct of_device_id cv1800_rtcsys_of_match[] = {
+	{ .compatible = "sophgo,cv1800b-rtc" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, cv1800_rtcsys_of_match);
+
+static struct platform_driver cv1800_rtcsys_mfd = {
+	.probe	= cv1800_rtcsys_probe,
+	.driver	= {
+		.name		= "cv1800_rtcsys",
+		.of_match_table	= cv1800_rtcsys_of_match,
+	},
+};
+module_platform_driver(cv1800_rtcsys_mfd);
+
+MODULE_AUTHOR("Alexander Sverdlin <alexander.sverdlin@...il.com>");
+MODULE_DESCRIPTION("Sophgo CV1800 series SoC RTC MFD driver");
+MODULE_LICENSE("GPL");
-- 
2.48.1