Merge tag 'riscv-sophgo-soc-for-v6.16' of https://github.com/sophgo/linux into soc/drivers

RISC-V SoC for v6.16

Sophgo:

Add support for SG2044 TOP syscon device. The SG2044 TOP
device provide PLL clock function in its area.

Add RTC support for CV1800 series SoC. The device
is called RTC, but contains control registers of other
HW blocks in its address space, most notably of
Power-on-Reset (PoR) module, DW8051 IP (MCU core),
accompanying SRAM, hence putting it in SoC subsystem.

Signed-off-by: Chen Wang <unicorn_wang@outlook.com>

* tag 'riscv-sophgo-soc-for-v6.16' of https://github.com/sophgo/linux:
  soc: sophgo: cv1800: rtcsys: New driver (handling RTC only)
  dt-bindings: soc: sophgo: add RTC support for Sophgo CV1800 series
  soc: sophgo: sg2044: Add support for SG2044 TOP syscon device

Link: https://lore.kernel.org/r/MA0P287MB2262B041A26A0F5EAD1E296CFE91A@MA0P287MB2262.INDP287.PROD.OUTLOOK.COM
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

7 files changed, 234 insertions, 0 deletions

diff --git a/Documentation/devicetree/bindings/soc/sophgo/sophgo,cv1800b-rtc.yaml b/Documentation/devicetree/bindings/soc/sophgo/sophgo,cv1800b-rtc.yaml
new file mode 100644
index 000000000000..5cf186c396c9
--- /dev/null
+++ b/Documentation/devicetree/bindings/soc/sophgo/sophgo,cv1800b-rtc.yaml
@@ -0,0 +1,86 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/sophgo/sophgo,cv1800b-rtc.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Real Time Clock of the Sophgo CV1800 SoC
+
+description:
+  The RTC (Real Time Clock) is an independently powered module in the chip. It
+  contains a 32KHz oscillator and a Power-On-Reset (POR) sub-module, which can
+  be used for time display and scheduled alarm produce. In addition, the
+  hardware state machine provides triggering and timing control for chip
+  power-on, power-off and reset.
+
+  Furthermore, the 8051 subsystem is located within RTCSYS and is independently
+  powered. System software can use the 8051 to manage wake conditions and wake
+  the system while the system is asleep, and communicate with external devices
+  through peripheral controllers.
+
+  Technical Reference Manual available at
+    https://github.com/sophgo/sophgo-doc/tree/main/SG200X/TRM
+
+maintainers:
+  - sophgo@lists.linux.dev
+
+allOf:
+  - $ref: /schemas/rtc/rtc.yaml#
+
+properties:
+  compatible:
+    items:
+      - const: sophgo,cv1800b-rtc
+      - const: syscon
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    items:
+      - description: RTC Alarm
+      - description: RTC Longpress
+      - description: VBAT DET
+
+  interrupt-names:
+    items:
+      - const: alarm
+      - const: longpress
+      - const: vbat
+
+  clocks:
+    items:
+      - description: RTC clock source
+      - description: DW8051 MCU clock source
+
+  clock-names:
+    items:
+      - const: rtc
+      - const: mcu
+
+required:
+  - compatible
+  - reg
+  - interrupts
+  - interrupt-names
+  - clocks
+  - clock-names
+
+unevaluatedProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/clock/sophgo,cv1800.h>
+    #include <dt-bindings/interrupt-controller/irq.h>
+
+    rtc@5025000 {
+        compatible = "sophgo,cv1800b-rtc", "syscon";
+        reg = <0x5025000 0x2000>;
+        interrupts = <17 IRQ_TYPE_LEVEL_HIGH>,
+                     <18 IRQ_TYPE_LEVEL_HIGH>,
+                     <19 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-names = "alarm", "longpress", "vbat";
+        clocks = <&clk CLK_RTC_25M>,
+                 <&clk CLK_SRC_RTC_SYS_0>;
+        clock-names = "rtc", "mcu";
+    };
diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig
index 37ca3f094f89..a2d65adffb80 100644
--- a/drivers/soc/Kconfig
+++ b/drivers/soc/Kconfig
@@ -23,6 +23,7 @@ source "drivers/soc/qcom/Kconfig"
 source "drivers/soc/renesas/Kconfig"
 source "drivers/soc/rockchip/Kconfig"
 source "drivers/soc/samsung/Kconfig"
+source "drivers/soc/sophgo/Kconfig"
 source "drivers/soc/sunxi/Kconfig"
 source "drivers/soc/tegra/Kconfig"
 source "drivers/soc/ti/Kconfig"
diff --git a/drivers/soc/Makefile b/drivers/soc/Makefile
index 777255401252..c9e689080ceb 100644
--- a/drivers/soc/Makefile
+++ b/drivers/soc/Makefile
@@ -29,6 +29,7 @@ obj-y				+= qcom/
 obj-y				+= renesas/
 obj-y				+= rockchip/
 obj-$(CONFIG_SOC_SAMSUNG)	+= samsung/
+obj-y				+= sophgo/
 obj-y				+= sunxi/
 obj-$(CONFIG_ARCH_TEGRA)	+= tegra/
 obj-y				+= ti/
diff --git a/drivers/soc/sophgo/Kconfig b/drivers/soc/sophgo/Kconfig
new file mode 100644
index 000000000000..45f78b270c91
--- /dev/null
+++ b/drivers/soc/sophgo/Kconfig
@@ -0,0 +1,34 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Sophgo SoC drivers
+#
+
+if ARCH_SOPHGO || COMPILE_TEST
+menu "Sophgo SoC drivers"
+
+config SOPHGO_CV1800_RTCSYS
+	tristate "Sophgo CV1800 RTC MFD"
+	select MFD_CORE
+	help
+	  If you say yes here you get support the RTC MFD driver for Sophgo
+	  CV1800 series SoC. The RTC module comprises a 32kHz oscillator,
+	  Power-on-Reset (PoR) sub-module, HW state machine to control chip
+	  power-on, power-off and reset. Furthermore, the 8051 subsystem is
+	  located within RTCSYS including associated SRAM block.
+
+	  This driver can also be built as a module. If so, the module will be
+	  called cv1800-rtcsys.
+
+config SOPHGO_SG2044_TOPSYS
+	tristate "Sophgo SG2044 TOP syscon driver"
+	select MFD_CORE
+	help
+	  This is the core driver for the Sophgo SG2044 TOP system
+	  controller device. This driver provide PLL clock device
+	  for the SoC.
+
+	  This driver can also be built as a module.  If so, the module
+	  will be called sg2044-topsys.
+
+endmenu
+endif
diff --git a/drivers/soc/sophgo/Makefile b/drivers/soc/sophgo/Makefile
new file mode 100644
index 000000000000..27f68df22c4d
--- /dev/null
+++ b/drivers/soc/sophgo/Makefile
@@ -0,0 +1,4 @@
+# SPDX-License-Identifier: GPL-2.0
+
+obj-$(CONFIG_SOPHGO_CV1800_RTCSYS)	+= cv1800-rtcsys.o
+obj-$(CONFIG_SOPHGO_SG2044_TOPSYS)	+= sg2044-topsys.o
diff --git a/drivers/soc/sophgo/cv1800-rtcsys.c b/drivers/soc/sophgo/cv1800-rtcsys.c
new file mode 100644
index 000000000000..fdae2e2a61c5
--- /dev/null
+++ b/drivers/soc/sophgo/cv1800-rtcsys.c
@@ -0,0 +1,63 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for Sophgo CV1800 series SoC RTC subsystem
+ *
+ * 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@gmail.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 = "cv1800b-rtc",
+		.num_resources = 1,
+		.resources = &cv1800_rtcsys_irq_resources[0],
+	},
+};
+
+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@gmail.com>");
+MODULE_DESCRIPTION("Sophgo CV1800 series SoC RTC subsystem driver");
+MODULE_LICENSE("GPL");
diff --git a/drivers/soc/sophgo/sg2044-topsys.c b/drivers/soc/sophgo/sg2044-topsys.c
new file mode 100644
index 000000000000..179f2620b2a9
--- /dev/null
+++ b/drivers/soc/sophgo/sg2044-topsys.c
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Sophgo SG2044 multi-function system controller driver
+ *
+ * Copyright (C) 2025 Inochi Amaoto <inochiama@gmail.com>
+ */
+
+#include <linux/mfd/core.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/property.h>
+#include <linux/resource.h>
+
+static const struct mfd_cell sg2044_topsys_subdev[] = {
+	{
+		.name = "sg2044-pll",
+	},
+};
+
+static int sg2044_topsys_probe(struct platform_device *pdev)
+{
+	return devm_mfd_add_devices(&pdev->dev, PLATFORM_DEVID_AUTO,
+				    sg2044_topsys_subdev,
+				    ARRAY_SIZE(sg2044_topsys_subdev),
+				    NULL, 0, NULL);
+}
+
+static const struct of_device_id sg2044_topsys_of_match[] = {
+	{ .compatible = "sophgo,sg2044-top-syscon" },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, sg2044_topsys_of_match);
+
+static struct platform_driver sg2044_topsys_driver = {
+	.probe = sg2044_topsys_probe,
+	.driver = {
+		.name = "sg2044-topsys",
+		.of_match_table = sg2044_topsys_of_match,
+	},
+};
+module_platform_driver(sg2044_topsys_driver);
+
+MODULE_AUTHOR("Inochi Amaoto <inochiama@gmail.com>");
+MODULE_DESCRIPTION("Sophgo SG2044 multi-function system controller driver");
+MODULE_LICENSE("GPL");