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@xxxxxxxxx> --- 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@xxxxxxxxxxx> M: Inochi Amaoto <inochiama@xxxxxxxxxxx> 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@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 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@xxxxxxxxx>"); +MODULE_DESCRIPTION("Sophgo CV1800 series SoC RTC MFD driver"); +MODULE_LICENSE("GPL"); -- 2.48.1
