mfd: madera: Add common support for Cirrus Logic Madera codecs

This adds the generic core support for Cirrus Logic "Madera" class codecs.
These are complex audio codec SoCs with a variety of digital and analogue
I/O, onboard audio processing and DSPs, and other features.

These codecs are all based off a common set of hardware IP so can be
supported by a core of common code (with a few minor device-to-device
variations).

Signed-off-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Nikesh Oswal <Nikesh.Oswal@cirrus.com>
Signed-off-by: Richard Fitzgerald <rf@opensource.cirrus.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

9 files changed, 1215 insertions, 0 deletions

diff --git a/MAINTAINERS b/MAINTAINERS
index 6e5bb62acea2..7b8e857d6b33 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -3487,7 +3487,10 @@ L:	patches@opensource.cirrus.com
 T:      git https://github.com/CirrusLogic/linux-drivers.git
 W:      https://github.com/CirrusLogic/linux-drivers/wiki
 S:      Supported
+F:      Documentation/devicetree/bindings/mfd/madera.txt
 F:      include/linux/mfd/madera/*
+F:      drivers/mfd/madera*
+F:      drivers/mfd/cs47l*
 
 CLEANCACHE API
 M:      Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index b860eb5aa194..f5ca392f8bc2 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -232,6 +232,35 @@ config MFD_CROS_EC_CHARDEV
           If you have a supported Chromebook, choose Y or M here.
           The module will be called cros_ec_dev.
 
+config MFD_MADERA
+        tristate "Cirrus Logic Madera codecs"
+        select MFD_CORE
+        select REGMAP
+        select REGMAP_IRQ
+        select MADERA_IRQ
+        select PINCTRL
+        select PINCTRL_MADERA
+        help
+          Support for the Cirrus Logic Madera platform audio codecs
+
+config MFD_MADERA_I2C
+        tristate "Cirrus Logic Madera codecs with I2C"
+        depends on MFD_MADERA
+        depends on I2C
+        select REGMAP_I2C
+        help
+          Support for the Cirrus Logic Madera platform audio SoC
+          core functionality controlled via I2C.
+
+config MFD_MADERA_SPI
+        tristate "Cirrus Logic Madera codecs with SPI"
+        depends on MFD_MADERA
+        depends on SPI_MASTER
+        select REGMAP_SPI
+        help
+          Support for the Cirrus Logic Madera platform audio SoC
+          core functionality controlled via SPI.
+
 config MFD_ASIC3
         bool "Compaq ASIC3"
         depends on GPIOLIB && ARM
diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index d9d2cf0d32ef..0a89a6a6d793 100644
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -73,6 +73,11 @@ wm8994-objs			:= wm8994-core.o wm8994-irq.o wm8994-regmap.o
 obj-$(CONFIG_MFD_WM8994)        += wm8994.o
 obj-$(CONFIG_MFD_WM97xx)        += wm97xx-core.o
 
+madera-objs                     := madera-core.o
+obj-$(CONFIG_MFD_MADERA)        += madera.o
+obj-$(CONFIG_MFD_MADERA_I2C)    += madera-i2c.o
+obj-$(CONFIG_MFD_MADERA_SPI)    += madera-spi.o
+
 obj-$(CONFIG_TPS6105X)          += tps6105x.o
 obj-$(CONFIG_TPS65010)          += tps65010.o
 obj-$(CONFIG_TPS6507X)          += tps6507x.o
diff --git a/drivers/mfd/madera-core.c b/drivers/mfd/madera-core.c
new file mode 100644
index 000000000000..8cfea969b060
--- /dev/null
+++ b/drivers/mfd/madera-core.c
@@ -0,0 +1,609 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Core MFD support for Cirrus Logic Madera codecs
+ *
+ * Copyright (C) 2015-2018 Cirrus Logic
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; version 2.
+ */
+
+#include <linux/device.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/gpio.h>
+#include <linux/mfd/core.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/of.h>
+#include <linux/of_gpio.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+#include <linux/regulator/machine.h>
+#include <linux/regulator/of_regulator.h>
+
+#include <linux/mfd/madera/core.h>
+#include <linux/mfd/madera/registers.h>
+
+#include "madera.h"
+
+#define CS47L35_SILICON_ID      0x6360
+#define CS47L85_SILICON_ID      0x6338
+#define CS47L90_SILICON_ID      0x6364
+
+#define MADERA_32KZ_MCLK2       1
+
+static const char * const madera_core_supplies[] = {
+        "AVDD",
+        "DBVDD1",
+};
+
+static const struct mfd_cell madera_ldo1_devs[] = {
+        { .name = "madera-ldo1" },
+};
+
+static const char * const cs47l35_supplies[] = {
+        "MICVDD",
+        "DBVDD2",
+        "CPVDD1",
+        "CPVDD2",
+        "SPKVDD",
+};
+
+static const struct mfd_cell cs47l35_devs[] = {
+        { .name = "madera-pinctrl", },
+        { .name = "madera-irq", },
+        { .name = "madera-micsupp", },
+        { .name = "madera-gpio", },
+        { .name = "madera-extcon", },
+        {
+                .name = "cs47l35-codec",
+                .parent_supplies = cs47l35_supplies,
+                .num_parent_supplies = ARRAY_SIZE(cs47l35_supplies),
+        },
+};
+
+static const char * const cs47l85_supplies[] = {
+        "MICVDD",
+        "DBVDD2",
+        "DBVDD3",
+        "DBVDD4",
+        "CPVDD1",
+        "CPVDD2",
+        "SPKVDDL",
+        "SPKVDDR",
+};
+
+static const struct mfd_cell cs47l85_devs[] = {
+        { .name = "madera-pinctrl", },
+        { .name = "madera-irq", },
+        { .name = "madera-micsupp" },
+        { .name = "madera-gpio", },
+        { .name = "madera-extcon", },
+        {
+                .name = "cs47l85-codec",
+                .parent_supplies = cs47l85_supplies,
+                .num_parent_supplies = ARRAY_SIZE(cs47l85_supplies),
+        },
+};
+
+static const char * const cs47l90_supplies[] = {
+        "MICVDD",
+        "DBVDD2",
+        "DBVDD3",
+        "DBVDD4",
+        "CPVDD1",
+        "CPVDD2",
+};
+
+static const struct mfd_cell cs47l90_devs[] = {
+        { .name = "madera-pinctrl", },
+        { .name = "madera-irq", },
+        { .name = "madera-micsupp", },
+        { .name = "madera-gpio", },
+        { .name = "madera-extcon", },
+        {
+                .name = "cs47l90-codec",
+                .parent_supplies = cs47l90_supplies,
+                .num_parent_supplies = ARRAY_SIZE(cs47l90_supplies),
+        },
+};
+
+/* Used by madera-i2c and madera-spi drivers */
+const char *madera_name_from_type(enum madera_type type)
+{
+        switch (type) {
+        case CS47L35:
+                return "CS47L35";
+        case CS47L85:
+                return "CS47L85";
+        case CS47L90:
+                return "CS47L90";
+        case CS47L91:
+                return "CS47L91";
+        case WM1840:
+                return "WM1840";
+        default:
+                return "Unknown";