On Sun, 02 Mar 2025, Alexander Sverdlin wrote: > 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"); How is this different from the one above? Adding a single device does not constitute an MFD. > +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 > -- Lee Jones [李琼斯]
