On Fri, 27 Apr 2018, matthias....@kernel.org wrote: > From: Matthias Brugger <mbrug...@suse.com> > > The MMSYS subsystem includes clocks and drm components. > This patch adds a MFD device to probe both drivers from the same > device tree compatible. > > Signed-off-by: Matthias Brugger <mbrug...@suse.com> > --- > drivers/mfd/Kconfig | 9 ++++++ > drivers/mfd/Makefile | 2 ++ > drivers/mfd/mtk-mmsys.c | 79 > +++++++++++++++++++++++++++++++++++++++++++++++++ > 3 files changed, 90 insertions(+) > create mode 100644 drivers/mfd/mtk-mmsys.c > > diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig > index b860eb5aa194..d23a3b9a2c58 100644 > --- a/drivers/mfd/Kconfig > +++ b/drivers/mfd/Kconfig > @@ -378,6 +378,15 @@ config MFD_MC13XXX_I2C > help > Select this if your MC13xxx is connected via an I2C bus. > > +config MFD_MEDIATEK_MMSYS > + tristate "Mediatek MMSYS interface" > + select MFD_CORE > + select REGMAP_MMIO > + help > + Select this if you have a MMSYS subsystem in your SoC. The > + MMSYS subsystem has at least a clock driver part and some > + DRM components. > + > config MFD_MXS_LRADC > tristate "Freescale i.MX23/i.MX28 LRADC" > depends on ARCH_MXS || COMPILE_TEST > diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile > index d9d2cf0d32ef..b96118bd68d9 100644 > --- a/drivers/mfd/Makefile > +++ b/drivers/mfd/Makefile > @@ -98,6 +98,8 @@ obj-$(CONFIG_MFD_MC13XXX) += mc13xxx-core.o > obj-$(CONFIG_MFD_MC13XXX_SPI) += mc13xxx-spi.o > obj-$(CONFIG_MFD_MC13XXX_I2C) += mc13xxx-i2c.o > > +obj-$(CONFIG_MFD_MEDIATEK_MMSYS) += mtk-mmsys.o > + > obj-$(CONFIG_MFD_CORE) += mfd-core.o > > obj-$(CONFIG_EZX_PCAP) += ezx-pcap.o > diff --git a/drivers/mfd/mtk-mmsys.c b/drivers/mfd/mtk-mmsys.c > new file mode 100644 > index 000000000000..c802343fb1c6 > --- /dev/null > +++ b/drivers/mfd/mtk-mmsys.c > @@ -0,0 +1,79 @@ > +// SPDX-License-Identifier: GPL-2.0+ > + > +/* > + * mtk-mmsys.c -- Mediatek MMSYS multi-function driver > + * > + * Copyright (c) 2018 Matthias Brugger <matthias....@gmail.com> > + * > + * Author: Matthias Brugger <matthias....@gmail.com> > + */ > + > +#include <linux/module.h> > +#include <linux/init.h> > +#include <linux/mfd/core.h> > +#include <linux/of.h> > +#include <linux/of_address.h> > +#include <linux/of_device.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > + > +enum { > + MMSYS_MT2701 = 1, > +}; > + > +static const struct mfd_cell mmsys_mt2701_devs[] = { > + { .name = "clk-mt2701-mm", }, > + { .name = "drm-mt2701-mm", }, > +}; > + > +static int mmsys_probe(struct platform_device *pdev) > +{ > + const struct mfd_cell *mmsys_cells; > + int nr_cells; > + long id; > + int ret; > + > + id = (long) of_device_get_match_data(&pdev->dev); > + if (!id) { > + dev_err(&pdev->dev, "of_device_get match_data() failed\n"); > + return -EINVAL; > + } > + > + switch (id) { > + case MMSYS_MT2701: > + mmsys_cells = mmsys_mt2701_devs; > + nr_cells = ARRAY_SIZE(mmsys_mt2701_devs); > + break; > + default: > + return -ENODEV; > + } > + > + ret = devm_mfd_add_devices(&pdev->dev, 0, mmsys_cells, nr_cells, > + NULL, 0, NULL); > + if (ret) { > + dev_err(&pdev->dev, "failed to add MFD devices %d\n", ret); > + return ret; > + } > + > + return 0; > +};
This driver is pretty pointless. It doesn't actually do anything. I think you just want to use "simple-mfd" instead. > +static const struct of_device_id of_match_mmsys[] = { > + { .compatible = "mediatek,mt2701-mmsys", > + .data = (void *) MMSYS_MT2701, > + }, > + { /* sentinel */ }, > +}; > + > +static struct platform_driver mmsys_drv = { > + .probe = mmsys_probe, > + .driver = { > + .name = "mediatek-mmysys", > + .of_match_table = of_match_ptr(of_match_mmsys), > + }, > +}; > + > +builtin_platform_driver(mmsys_drv); > + > +MODULE_DESCRIPTION("Mediatek MMSYS multi-function driver"); > +MODULE_LICENSE("GPL"); -- Lee Jones [李琼斯] Linaro Services Technical Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel