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Subject[PATCH 05/12] mfd: mtk-audsys: add MediaTek audio subsystem driver
Date
Add a common driver for the top block of the MediaTek audio subsystem.
This is a wrapper which manages resources for audio components.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
---
drivers/mfd/Kconfig | 9 ++++
drivers/mfd/Makefile | 2 +
drivers/mfd/mtk-audsys.c | 138 +++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 149 insertions(+)
create mode 100644 drivers/mfd/mtk-audsys.c

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 1d20a80..ea50b51 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_AUDSYS
+ tristate "MediaTek audio subsystem interface"
+ select MDF_CORE
+ select REGMAP_MMIO
+ help
+ Select this if you have a audio subsystem in MediaTek SoC.
+ The audio subsystem has at least a clock driver part and some
+ audio 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 d9474ad..3e20927 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -101,6 +101,8 @@ obj-$(CONFIG_MFD_MC13XXX) += mc13xxx-core.o
obj-$(CONFIG_MFD_MC13XXX_SPI) += mc13xxx-spi.o
obj-$(CONFIG_MFD_MC13XXX_I2C) += mc13xxx-i2c.o

+obj-$(CONFIG_MFD_MEDIATEK_AUDSYS) += mtk-audsys.o
+
obj-$(CONFIG_MFD_CORE) += mfd-core.o

obj-$(CONFIG_EZX_PCAP) += ezx-pcap.o
diff --git a/drivers/mfd/mtk-audsys.c b/drivers/mfd/mtk-audsys.c
new file mode 100644
index 0000000..89399e1
--- /dev/null
+++ b/drivers/mfd/mtk-audsys.c
@@ -0,0 +1,138 @@
+/*
+ * Mediatek audio subsystem core driver
+ *
+ * Copyright (c) 2017 MediaTek Inc.
+ *
+ * Author: Ryder Lee <ryder.lee@mediatek.com>
+ *
+ * For licencing details see kernel-base/COPYING
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+
+#define AUDSYS_MAX_CLK_NUM 3
+
+struct sys_dev {
+ struct device *dev;
+ struct regmap *regmap;
+ int clk_num;
+ struct clk *clks[];
+};
+
+static const struct regmap_config aud_regmap_config = {
+ .reg_bits = 32,
+ .reg_stride = 4,
+ .val_bits = 32,
+ .max_register = 0x15e0,
+ .cache_type = REGCACHE_NONE,
+};
+
+static int mtk_subsys_enable(struct sys_dev *sys)
+{
+ struct device *dev = sys->dev;
+ struct clk *clk;
+ int i, ret;
+
+ for (i = 0; i < sys->clk_num; i++) {
+ clk = of_clk_get(dev->of_node, i);
+ if (IS_ERR(clk)) {
+ if (PTR_ERR(clk) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+ break;
+ }
+ sys->clks[i] = clk;
+ }
+
+ for (i = 0; i < sys->clk_num && sys->clks[i]; i++) {
+ ret = clk_prepare_enable(sys->clks[i]);
+ if (ret)
+ goto err_enable_clks;
+ }
+
+ return 0;
+
+err_enable_clks:
+ while (--i >= 0)
+ clk_disable_unprepare(sys->clks[i]);
+
+ return ret;
+}
+
+static int mtk_subsys_probe(struct platform_device *pdev)
+{
+ struct sys_dev *sys;
+ struct resource *res;
+ void __iomem *mmio;
+ int num, ret;
+
+ num = (int)of_device_get_match_data(&pdev->dev);
+ if (!num)
+ return -EINVAL;
+
+ sys = devm_kzalloc(&pdev->dev, sizeof(*sys) +
+ sizeof(struct clk *) * num, GFP_KERNEL);
+ if (!sys)
+ return -ENOMEM;
+
+ sys->clk_num = num;
+ sys->dev = &pdev->dev;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ mmio = devm_ioremap_resource(sys->dev, res);
+ if (IS_ERR(mmio))
+ return PTR_ERR(mmio);
+
+ sys->regmap = devm_regmap_init_mmio(sys->dev, mmio,
+ &aud_regmap_config);
+ if (IS_ERR(sys->regmap))
+ return PTR_ERR(sys->regmap);
+
+ platform_set_drvdata(pdev, sys);
+
+ /* Enable top level clocks */
+ ret = mtk_subsys_enable(sys);
+ if (ret)
+ return ret;
+
+ return devm_of_platform_populate(sys->dev);
+};
+
+static int mtk_subsys_remove(struct platform_device *pdev)
+{
+ struct sys_dev *sys = platform_get_drvdata(pdev);
+ int i;
+
+ for (i = sys->clk_num - 1; i >= 0; i--)
+ if (sys->clks[i])
+ clk_disable_unprepare(sys->clks[i]);
+
+ return 0;
+}
+
+static const struct of_device_id of_match_audsys[] = {
+ {
+ .compatible = "mediatek,mt2701-audsys-core",
+ .data = (void *)AUDSYS_MAX_CLK_NUM,
+ },
+ {},
+};
+MODULE_DEVICE_TABLE(platform, of_match_audsys);
+
+static struct platform_driver audsys_drv = {
+ .probe = mtk_subsys_probe,
+ .remove = mtk_subsys_remove,
+ .driver = {
+ .name = "mediatek-audsys-core",
+ .of_match_table = of_match_ptr(of_match_audsys),
+ },
+};
+
+builtin_platform_driver(audsys_drv);
+
+MODULE_DESCRIPTION("Mediatek audio subsystem core driver");
+MODULE_LICENSE("GPL");
--
1.9.1
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