mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-08-27 06:50:37 +00:00
c8754c7dea
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>
64 lines
1.7 KiB
C
64 lines
1.7 KiB
C
// 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");
|