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soc: sophgo: cv1800: rtcsys: New driver (handling RTC only)

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Add 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.

This patch only populates RTC sub-device.

Signed-off-by: Alexander Sverdlin <alexander.sverdlin@gmail.com>
Reviewed-by: Inochi Amaoto <inochiama@gmail.com>
Link: https://lore.kernel.org/r/20250315224921.3627852-3-alexander.sverdlin@gmail.com
Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
Signed-off-by: Chen Wang <unicorn_wang@outlook.com>
Signed-off-by: Chen Wang <wangchen20@iscas.ac.cn>
This commit is contained in:
Alexander Sverdlin
2025-03-15 23:49:13 +01:00
committed by Inochi Amaoto
parent 76517429db
commit c8754c7dea
3 changed files with 77 additions and 0 deletions
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13
drivers/soc/sophgo/Kconfig
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@@ -6,6 +6,19 @@
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

1
drivers/soc/sophgo/Makefile
View File

@@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_SOPHGO_CV1800_RTCSYS) += cv1800-rtcsys.o
obj-$(CONFIG_SOPHGO_SG2044_TOPSYS) += sg2044-topsys.o

63
drivers/soc/sophgo/cv1800-rtcsys.c Normal file
View File

@@ -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");