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@xxxxxxxxx> --- Changelog: v13: - Moved the driver from MFD into SOC subsystem - Dropped unused "cv1800_rtcsys_rtc_subdev" v12: - new patch MAINTAINERS | 1 + drivers/soc/Kconfig | 1 + drivers/soc/Makefile | 1 + drivers/soc/sophgo/Kconfig | 24 ++++++++++++ drivers/soc/sophgo/Makefile | 3 ++ drivers/soc/sophgo/cv1800-rtcsys.c | 63 ++++++++++++++++++++++++++++++ 6 files changed, 93 insertions(+) create mode 100644 drivers/soc/sophgo/Kconfig create mode 100644 drivers/soc/sophgo/Makefile create mode 100644 drivers/soc/sophgo/cv1800-rtcsys.c diff --git a/MAINTAINERS b/MAINTAINERS index 3eee238c2ea2..ac15e448fffb 100644 --- a/MAINTAINERS +++ b/MAINTAINERS @@ -22354,6 +22354,7 @@ L: sophgo@xxxxxxxxxxxxxxx W: https://github.com/sophgo/linux/wiki T: git https://github.com/sophgo/linux.git S: Maintained +F: drivers/soc/sophgo/cv1800-rtcsys.c N: sophgo K: sophgo diff --git a/drivers/soc/Kconfig b/drivers/soc/Kconfig index 6a8daeb8c4b9..11e2383c0654 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 2037a8695cb2..0381a0abdec8 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..e50666e423a9 --- /dev/null +++ b/drivers/soc/sophgo/Kconfig @@ -0,0 +1,24 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Sophgo/Cvitek SoC drivers +# + +if ARCH_SOPHGO || COMPILE_TEST +menu "Sophgo/Cvitek SoC drivers" + +config SOPHGO_CV1800_RTCSYS + tristate "Sophgo CV1800 RTC MFD" + default y if 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. + +endmenu +endif diff --git a/drivers/soc/sophgo/Makefile b/drivers/soc/sophgo/Makefile new file mode 100644 index 000000000000..8f22b4e79311 --- /dev/null +++ b/drivers/soc/sophgo/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_SOPHGO_CV1800_RTCSYS) += cv1800-rtcsys.o diff --git a/drivers/soc/sophgo/cv1800-rtcsys.c b/drivers/soc/sophgo/cv1800-rtcsys.c new file mode 100644 index 000000000000..cb271f02afcc --- /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@xxxxxxxxx> + * + */ + +#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 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@xxxxxxxxx>"); +MODULE_DESCRIPTION("Sophgo CV1800 series SoC RTC subsystem driver"); +MODULE_LICENSE("GPL"); -- 2.48.1
