[PATCH v5 1/3] mfd: wm831x: Add basic device tree binding

From: Charles Keepax
Date: Fri Mar 17 2017 - 06:13:32 EST

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Add the basic ability to register the device through device tree, more
work is needed to get each individual sub-driver functioning correctly
but this is enough to get the device to probe from device tree.

Signed-off-by: Charles Keepax <ckeepax@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
---

Changes since v4:
- Removed pointless intermediate variable after of_match_device
- Moved all local variables to start of function rather than in
their localised code block

Thanks,
Charles

drivers/mfd/wm831x-core.c | 29 +++++++++++++++++++++--------
drivers/mfd/wm831x-i2c.c | 19 ++++++++++++++++++-
drivers/mfd/wm831x-irq.c | 6 +++---
drivers/mfd/wm831x-spi.c | 18 ++++++++++++++++--
include/linux/mfd/wm831x/core.h | 9 ++++++++-
5 files changed, 66 insertions(+), 15 deletions(-)

diff --git a/drivers/mfd/wm831x-core.c b/drivers/mfd/wm831x-core.c
index 3e0e99e..13a4c11 100644
--- a/drivers/mfd/wm831x-core.c
+++ b/drivers/mfd/wm831x-core.c
@@ -19,6 +19,8 @@
#include <linux/mfd/core.h>
#include <linux/slab.h>
#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_device.h>

#include <linux/mfd/wm831x/core.h>
#include <linux/mfd/wm831x/pdata.h>
@@ -1613,12 +1615,24 @@ struct regmap_config wm831x_regmap_config = {
};
EXPORT_SYMBOL_GPL(wm831x_regmap_config);

+const struct of_device_id wm831x_of_match[] = {
+ { .compatible = "wlf,wm8310", .data = (void *)WM8310 },
+ { .compatible = "wlf,wm8311", .data = (void *)WM8311 },
+ { .compatible = "wlf,wm8312", .data = (void *)WM8312 },
+ { .compatible = "wlf,wm8320", .data = (void *)WM8320 },
+ { .compatible = "wlf,wm8321", .data = (void *)WM8321 },
+ { .compatible = "wlf,wm8325", .data = (void *)WM8325 },
+ { .compatible = "wlf,wm8326", .data = (void *)WM8326 },
+ { },
+};
+EXPORT_SYMBOL_GPL(wm831x_of_match);
+
/*
* Instantiate the generic non-control parts of the device.
*/
-int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq)
+int wm831x_device_init(struct wm831x *wm831x, int irq)
{
- struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
+ struct wm831x_pdata *pdata = &wm831x->pdata;
int rev, wm831x_num;
enum wm831x_parent parent;
int ret, i;
@@ -1627,8 +1641,7 @@ int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq)
mutex_init(&wm831x->key_lock);
dev_set_drvdata(wm831x->dev, wm831x);

- if (pdata)
- wm831x->soft_shutdown = pdata->soft_shutdown;
+ wm831x->soft_shutdown = pdata->soft_shutdown;

ret = wm831x_reg_read(wm831x, WM831X_PARENT_ID);
if (ret < 0) {
@@ -1663,7 +1676,7 @@ int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq)
*/
if (ret == 0) {
dev_info(wm831x->dev, "Device is an engineering sample\n");
- ret = id;
+ ret = wm831x->type;
}

switch (ret) {
@@ -1736,9 +1749,9 @@ int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq)
/* This will need revisiting in future but is OK for all
* current parts.
*/
- if (parent != id)
- dev_warn(wm831x->dev, "Device was registered as a WM%lx\n",
- id);
+ if (parent != wm831x->type)
+ dev_warn(wm831x->dev, "Device was registered as a WM%x\n",
+ wm831x->type);

/* Bootstrap the user key */
ret = wm831x_reg_read(wm831x, WM831X_SECURITY_KEY);
diff --git a/drivers/mfd/wm831x-i2c.c b/drivers/mfd/wm831x-i2c.c
index 824bcba..781af06 100644
--- a/drivers/mfd/wm831x-i2c.c
+++ b/drivers/mfd/wm831x-i2c.c
@@ -19,6 +19,8 @@
#include <linux/mfd/core.h>
#include <linux/slab.h>
#include <linux/err.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/regmap.h>

#include <linux/mfd/wm831x/core.h>
@@ -27,15 +29,26 @@
static int wm831x_i2c_probe(struct i2c_client *i2c,
const struct i2c_device_id *id)
{
+ struct wm831x_pdata *pdata = dev_get_platdata(&i2c->dev);
+ const struct of_device_id *of_id;
struct wm831x *wm831x;
+ enum wm831x_parent type;
int ret;

+ if (i2c->dev.of_node) {
+ of_id = of_match_device(wm831x_of_match, &i2c->dev);
+ type = (enum wm831x_parent)of_id->data;
+ } else {
+ type = (enum wm831x_parent)id->driver_data;
+ }
+
wm831x = devm_kzalloc(&i2c->dev, sizeof(struct wm831x), GFP_KERNEL);
if (wm831x == NULL)
return -ENOMEM;

i2c_set_clientdata(i2c, wm831x);
wm831x->dev = &i2c->dev;
+ wm831x->type = type;

wm831x->regmap = devm_regmap_init_i2c(i2c, &wm831x_regmap_config);
if (IS_ERR(wm831x->regmap)) {
@@ -45,7 +58,10 @@ static int wm831x_i2c_probe(struct i2c_client *i2c,
return ret;
}

- return wm831x_device_init(wm831x, id->driver_data, i2c->irq);
+ if (pdata)
+ memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
+
+ return wm831x_device_init(wm831x, i2c->irq);
}

static int wm831x_i2c_remove(struct i2c_client *i2c)
@@ -94,6 +110,7 @@ static struct i2c_driver wm831x_i2c_driver = {
.driver = {
.name = "wm831x",
.pm = &wm831x_pm_ops,
+ .of_match_table = of_match_ptr(wm831x_of_match),
},
.probe = wm831x_i2c_probe,
.remove = wm831x_i2c_remove,
diff --git a/drivers/mfd/wm831x-irq.c b/drivers/mfd/wm831x-irq.c
index dfea8b9..c01239a 100644
--- a/drivers/mfd/wm831x-irq.c
+++ b/drivers/mfd/wm831x-irq.c
@@ -564,7 +564,7 @@ static const struct irq_domain_ops wm831x_irq_domain_ops = {

int wm831x_irq_init(struct wm831x *wm831x, int irq)
{
- struct wm831x_pdata *pdata = dev_get_platdata(wm831x->dev);
+ struct wm831x_pdata *pdata = &wm831x->pdata;
struct irq_domain *domain;
int i, ret, irq_base;

@@ -579,7 +579,7 @@ int wm831x_irq_init(struct wm831x *wm831x, int irq)
}

/* Try to dynamically allocate IRQs if no base is specified */
- if (pdata && pdata->irq_base) {
+ if (pdata->irq_base) {
irq_base = irq_alloc_descs(pdata->irq_base, 0,
WM831X_NUM_IRQS, 0);
if (irq_base < 0) {
@@ -608,7 +608,7 @@ int wm831x_irq_init(struct wm831x *wm831x, int irq)
return -EINVAL;
}

- if (pdata && pdata->irq_cmos)
+ if (pdata->irq_cmos)
i = 0;
else
i = WM831X_IRQ_OD;
diff --git a/drivers/mfd/wm831x-spi.c b/drivers/mfd/wm831x-spi.c
index 80482ae..c332e28 100644
--- a/drivers/mfd/wm831x-spi.c
+++ b/drivers/mfd/wm831x-spi.c
@@ -14,6 +14,8 @@

#include <linux/kernel.h>
#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#include <linux/pm.h>
#include <linux/spi/spi.h>
#include <linux/regmap.h>
@@ -23,12 +25,19 @@

static int wm831x_spi_probe(struct spi_device *spi)
{
+ struct wm831x_pdata *pdata = dev_get_platdata(&spi->dev);
const struct spi_device_id *id = spi_get_device_id(spi);
+ const struct of_device_id *of_id;
struct wm831x *wm831x;
enum wm831x_parent type;
int ret;

- type = (enum wm831x_parent)id->driver_data;
+ if (spi->dev.of_node) {
+ of_id = of_match_device(wm831x_of_match, &spi->dev);
+ type = (enum wm831x_parent)of_id->data;
+ } else {
+ type = (enum wm831x_parent)id->driver_data;
+ }

wm831x = devm_kzalloc(&spi->dev, sizeof(struct wm831x), GFP_KERNEL);
if (wm831x == NULL)
@@ -38,6 +47,7 @@ static int wm831x_spi_probe(struct spi_device *spi)

spi_set_drvdata(spi, wm831x);
wm831x->dev = &spi->dev;
+ wm831x->type = type;

wm831x->regmap = devm_regmap_init_spi(spi, &wm831x_regmap_config);
if (IS_ERR(wm831x->regmap)) {
@@ -47,7 +57,10 @@ static int wm831x_spi_probe(struct spi_device *spi)
return ret;
}

- return wm831x_device_init(wm831x, type, spi->irq);
+ if (pdata)
+ memcpy(&wm831x->pdata, pdata, sizeof(*pdata));
+
+ return wm831x_device_init(wm831x, spi->irq);
}

static int wm831x_spi_remove(struct spi_device *spi)
@@ -97,6 +110,7 @@ static struct spi_driver wm831x_spi_driver = {
.driver = {
.name = "wm831x",
.pm = &wm831x_spi_pm,
+ .of_match_table = of_match_ptr(wm831x_of_match),
},
.id_table = wm831x_spi_ids,
.probe = wm831x_spi_probe,
diff --git a/include/linux/mfd/wm831x/core.h b/include/linux/mfd/wm831x/core.h
index 76c2264..b49fa676 100644
--- a/include/linux/mfd/wm831x/core.h
+++ b/include/linux/mfd/wm831x/core.h
@@ -21,6 +21,8 @@
#include <linux/list.h>
#include <linux/regmap.h>
#include <linux/mfd/wm831x/auxadc.h>
+#include <linux/mfd/wm831x/pdata.h>
+#include <linux/of.h>

/*
* Register values.
@@ -367,6 +369,9 @@ struct wm831x {

struct regmap *regmap;

+ struct wm831x_pdata pdata;
+ enum wm831x_parent type;
+
int irq; /* Our chip IRQ */
struct mutex irq_lock;
struct irq_domain *irq_domain;
@@ -412,7 +417,7 @@ int wm831x_set_bits(struct wm831x *wm831x, unsigned short reg,
int wm831x_bulk_read(struct wm831x *wm831x, unsigned short reg,
int count, u16 *buf);

-int wm831x_device_init(struct wm831x *wm831x, unsigned long id, int irq);
+int wm831x_device_init(struct wm831x *wm831x, int irq);
void wm831x_device_exit(struct wm831x *wm831x);
int wm831x_device_suspend(struct wm831x *wm831x);
void wm831x_device_shutdown(struct wm831x *wm831x);
@@ -427,4 +432,6 @@ static inline int wm831x_irq(struct wm831x *wm831x, int irq)

extern struct regmap_config wm831x_regmap_config;

+extern const struct of_device_id wm831x_of_match[];
+
#endif
--
2.1.4

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