On Fri, 27 Apr 2018, matthias.bgg@xxxxxxxxxx wrote:
> From: Matthias Brugger <mbrugger@xxxxxxxx>
>
> 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 <mbrugger@xxxxxxxx>
> ---
> 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.bgg@xxxxxxxxx>
> + *
> + * Author: Matthias Brugger <matthias.bgg@xxxxxxxxx>
> + */
> +
> +#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
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