[RFC 05/15] gpio: move DT parsing code to separate functions
Andrzej Hajda
a.hajda at samsung.com
Wed Dec 10 07:48:23 PST 2014
The patch moves Device Tree parsing logic to separate
function.
Signed-off-by: Andrzej Hajda <a.hajda at samsung.com>
---
drivers/gpio/gpiolib-of.c | 59 +++++++++++++++++++++--------------------------
drivers/gpio/gpiolib.c | 33 +++++++++++++++++++-------
drivers/gpio/gpiolib.h | 4 ++--
3 files changed, 53 insertions(+), 43 deletions(-)
diff --git a/drivers/gpio/gpiolib-of.c b/drivers/gpio/gpiolib-of.c
index 604dbe6..4707727 100644
--- a/drivers/gpio/gpiolib-of.c
+++ b/drivers/gpio/gpiolib-of.c
@@ -28,7 +28,7 @@
/* Private data structure for of_gpiochip_find_and_xlate */
struct gg_data {
enum of_gpio_flags *flags;
- struct of_phandle_args gpiospec;
+ struct of_phandle_args *gpiospec;
struct gpio_desc *out_gpio;
};
@@ -39,12 +39,12 @@ static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
struct gg_data *gg_data = data;
int ret;
- if ((gc->of_node != gg_data->gpiospec.np) ||
- (gc->of_gpio_n_cells != gg_data->gpiospec.args_count) ||
+ if ((gc->of_node != gg_data->gpiospec->np) ||
+ (gc->of_gpio_n_cells != gg_data->gpiospec->args_count) ||
(!gc->of_xlate))
return false;
- ret = gc->of_xlate(gc, &gg_data->gpiospec, gg_data->flags);
+ ret = gc->of_xlate(gc, gg_data->gpiospec, gg_data->flags);
if (ret < 0)
return false;
@@ -52,61 +52,54 @@ static int of_gpiochip_find_and_xlate(struct gpio_chip *gc, void *data)
return true;
}
-/**
- * of_get_named_gpiod_flags() - Get a GPIO descriptor and flags for GPIO API
- * @np: device node to get GPIO from
- * @propname: property name containing gpio specifier(s)
- * @index: index of the GPIO
- * @flags: a flags pointer to fill in
- *
- * Returns GPIO descriptor to use with Linux GPIO API, or one of the errno
- * value on the error condition. If @flags is not NULL the function also fills
- * in flags for the GPIO.
- */
-struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
- const char *propname, int index, enum of_gpio_flags *flags)
+struct gpio_desc *of_get_gpiod_by_spec(struct of_phandle_args *spec,
+ enum of_gpio_flags *flags)
{
/* Return -EPROBE_DEFER to support probe() functions to be called
* later when the GPIO actually becomes available
*/
struct gg_data gg_data = {
.flags = flags,
- .out_gpio = ERR_PTR(-EPROBE_DEFER)
+ .out_gpio = ERR_PTR(-EPROBE_DEFER),
+ .gpiospec = spec
};
- int ret;
/* .of_xlate might decide to not fill in the flags, so clear it. */
if (flags)
*flags = 0;
- ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index,
- &gg_data.gpiospec);
- if (ret) {
- pr_debug("%s: can't parse '%s' property of node '%s[%d]'\n",
- __func__, propname, np->full_name, index);
- return ERR_PTR(ret);
- }
-
gpiochip_find(&gg_data, of_gpiochip_find_and_xlate);
- of_node_put(gg_data.gpiospec.np);
- pr_debug("%s: parsed '%s' property of node '%s[%d]' - status (%d)\n",
- __func__, propname, np->full_name, index,
+ pr_debug("%s: parsed property of node '%s[%d]' - status (%d)\n",
+ __func__, spec->np->full_name, spec->args[0],
PTR_ERR_OR_ZERO(gg_data.out_gpio));
+
return gg_data.out_gpio;
}
int of_get_named_gpio_flags(struct device_node *np, const char *list_name,
int index, enum of_gpio_flags *flags)
{
+ struct of_phandle_args spec;
struct gpio_desc *desc;
+ int ret;
+
+ ret = of_parse_phandle_with_args(np, list_name, "#gpio-cells", index,
+ &spec);
+ if (ret) {
+ pr_debug("%s: can't parse '%s' property of node '%s[%d]'\n",
+ __func__, list_name, np->full_name, index);
+ return ret;
+ }
- desc = of_get_named_gpiod_flags(np, list_name, index, flags);
+ desc = of_get_gpiod_by_spec(&spec, flags);
if (IS_ERR(desc))
return PTR_ERR(desc);
- else
- return desc_to_gpio(desc);
+
+ of_node_put(spec.np);
+
+ return desc_to_gpio(desc);
}
EXPORT_SYMBOL(of_get_named_gpio_flags);
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index e8e98ca..78fcec9 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1470,15 +1470,13 @@ void gpiod_add_lookup_table(struct gpiod_lookup_table *table)
mutex_unlock(&gpio_lookup_lock);
}
-static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
- unsigned int idx,
- enum gpio_lookup_flags *flags)
+static int of_get_gpiod_spec(struct device *dev, const char *con_id,
+ unsigned int idx, struct of_phandle_args *spec)
{
static const char *suffixes[] = { "gpios", "gpio" };
char prop_name[32]; /* 32 is max size of property name */
- enum of_gpio_flags of_flags;
- struct gpio_desc *desc;
unsigned int i;
+ int ret;
for (i = 0; i < ARRAY_SIZE(suffixes); i++) {
if (con_id)
@@ -1486,12 +1484,31 @@ static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
else
snprintf(prop_name, 32, "%s", suffixes[i]);
- desc = of_get_named_gpiod_flags(dev->of_node, prop_name, idx,
- &of_flags);
- if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER))
+ ret = of_parse_phandle_with_args(dev->of_node, prop_name,
+ "#gpio-cells", idx, spec);
+ if (!ret)
break;
}
+ return ret;
+}
+
+static struct gpio_desc *of_find_gpio(struct device *dev, const char *con_id,
+ unsigned int idx,
+ enum gpio_lookup_flags *flags)
+{
+ enum of_gpio_flags of_flags;
+ struct of_phandle_args spec;
+ struct gpio_desc *desc;
+ int ret;
+
+ ret = of_get_gpiod_spec(dev, con_id, idx, &spec);
+ if (ret)
+ return ERR_PTR(ret);
+
+ desc = of_get_gpiod_by_spec(&spec, &of_flags);
+ of_node_put(spec.np);
+
if (IS_ERR(desc))
return desc;
diff --git a/drivers/gpio/gpiolib.h b/drivers/gpio/gpiolib.h
index 9db2b6a..3c0c1ad 100644
--- a/drivers/gpio/gpiolib.h
+++ b/drivers/gpio/gpiolib.h
@@ -54,8 +54,8 @@ acpi_get_gpiod_by_index(struct device *dev, int index,
}
#endif
-struct gpio_desc *of_get_named_gpiod_flags(struct device_node *np,
- const char *list_name, int index, enum of_gpio_flags *flags);
+struct gpio_desc *of_get_gpiod_by_spec(struct of_phandle_args *spec,
+ enum of_gpio_flags *flags);
struct gpio_desc *gpiochip_get_desc(struct gpio_chip *chip, u16 hwnum);
--
1.9.1
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