[PATCH 2/8] mfd: mtk-mmsys: Add mmsys driver

Matthias Brugger
2017-11-14T21:41:08Z

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@suse.com>
---
drivers/mfd/Kconfig | 9 +++++
drivers/mfd/Makefile | 2 ++
drivers/mfd/mtk-mmsys.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++
include/linux/mfd/mmsys.h | 18 ++++++++++
4 files changed, 120 insertions(+)
create mode 100644 drivers/mfd/mtk-mmsys.c
create mode 100644 include/linux/mfd/mmsys.h

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index fc5e4fef89d2..3250ce5d205a 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -368,6 +368,15 @@ 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 MDF_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 8703ff17998e..d4fc99df784c 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -100,6 +100,8 @@ 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..102b491aa28f
--- /dev/null
+++ b/drivers/mfd/mtk-mmsys.c
@@ -0,0 +1,91 @@
+/*
+ * mtk-mmsys.c -- Mediatek MMSYS multi-function driver
+ *
+ * Copyright (c) 2017 Matthias Brugger <matthias.bgg@gmail.com>
+ *
+ * Author: Matthias Brugger <matthias.bgg@gmail.com>
+ *
+ * For licencing details see kernel-base/COPYING
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/mmsys.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)
+{
+ struct mmsys_dev *private;
+ 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;
+ }
+
+ private = devm_kzalloc(&pdev->dev, sizeof(*private), GFP_KERNEL);
+ if (!private)
+ return -ENOMEM;
+
+ private->dev = &pdev->dev;
+ dev_set_drvdata(private->dev, private);
+
+ private->of_node = pdev->dev.of_node;
+
+ ret = devm_mfd_add_devices(private->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;
+};
+
+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");
diff --git a/include/linux/mfd/mmsys.h b/include/linux/mfd/mmsys.h
new file mode 100644
index 000000000000..274b9ee03ada
--- /dev/null
+++ b/include/linux/mfd/mmsys.h
@@ -0,0 +1,18 @@
+/* Header of MMSYS MFD core driver for Mediatek platforms
+ *
+ * Copyright (c) 2017 Matthias Brugger <matthias.bgg@gmail.com>
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation.
+ */
+
+#ifndef __MEDIATEK_MMSYS__H__
+#define __MEDIATEK_MMSYS__H__
+
+struct mmsys_dev {
+ struct device *dev;
+ struct device_node *of_node;
+};
+
+#endif
--
2.14.2