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authorGrant Likely <grant.likely@secretlab.ca>2011-12-12 09:25:57 -0700
committerGrant Likely <grant.likely@secretlab.ca>2011-12-12 13:40:16 -0700
commit15c9a0acc3f7873db4b7d35d016729b2dc229b49 (patch)
treecfd9d6dd645d8116709521001e90dd75ffc19992 /drivers/of/gpio.c
parent1a2d397a6eb5cf40c382d9e3d4bc04aaeb025336 (diff)
downloadop-kernel-dev-15c9a0acc3f7873db4b7d35d016729b2dc229b49.zip
op-kernel-dev-15c9a0acc3f7873db4b7d35d016729b2dc229b49.tar.gz
of: create of_phandle_args to simplify return of phandle parsing data
of_parse_phandle_with_args() needs to return quite a bit of data. Rather than making each datum a separate **out_ argument, this patch creates struct of_phandle_args to contain all the returned data and reworks the user of the function. This patch also enables of_parse_phandle_with_args() to return the device node pointer for the phandle node. This patch also ends up being fairly major surgery to of_parse_handle_with_args(). The existing structure didn't work well when extending to use of_phandle_args, and I discovered bugs during testing. I also took the opportunity to rename the function to be like the existing of_parse_phandle(). v2: - moved declaration of of_phandle_args to fix compile on non-DT builds - fixed incorrect index in example usage - fixed incorrect return code handling for empty entries Reviewed-by: Shawn Guo <shawn.guo@freescale.com> Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Diffstat (limited to 'drivers/of/gpio.c')
-rw-r--r--drivers/of/gpio.c43
1 files changed, 19 insertions, 24 deletions
diff --git a/drivers/of/gpio.c b/drivers/of/gpio.c
index ea4f2fa..7e62d15 100644
--- a/drivers/of/gpio.c
+++ b/drivers/of/gpio.c
@@ -35,32 +35,27 @@ int of_get_named_gpio_flags(struct device_node *np, const char *propname,
int index, enum of_gpio_flags *flags)
{
int ret;
- struct device_node *gpio_np;
struct gpio_chip *gc;
- int size;
- const void *gpio_spec;
- const __be32 *gpio_cells;
+ struct of_phandle_args gpiospec;
- ret = of_parse_phandles_with_args(np, propname, "#gpio-cells", index,
- &gpio_np, &gpio_spec);
+ ret = of_parse_phandle_with_args(np, propname, "#gpio-cells", index,
+ &gpiospec);
if (ret) {
pr_debug("%s: can't parse gpios property\n", __func__);
goto err0;
}
- gc = of_node_to_gpiochip(gpio_np);
+ gc = of_node_to_gpiochip(gpiospec.np);
if (!gc) {
pr_debug("%s: gpio controller %s isn't registered\n",
- np->full_name, gpio_np->full_name);
+ np->full_name, gpiospec.np->full_name);
ret = -ENODEV;
goto err1;
}
- gpio_cells = of_get_property(gpio_np, "#gpio-cells", &size);
- if (!gpio_cells || size != sizeof(*gpio_cells) ||
- be32_to_cpup(gpio_cells) != gc->of_gpio_n_cells) {
+ if (gpiospec.args_count != gc->of_gpio_n_cells) {
pr_debug("%s: wrong #gpio-cells for %s\n",
- np->full_name, gpio_np->full_name);
+ np->full_name, gpiospec.np->full_name);
ret = -EINVAL;
goto err1;
}
@@ -69,13 +64,13 @@ int of_get_named_gpio_flags(struct device_node *np, const char *propname,
if (flags)
*flags = 0;
- ret = gc->of_xlate(gc, np, gpio_spec, flags);
+ ret = gc->of_xlate(gc, &gpiospec, flags);
if (ret < 0)
goto err1;
ret += gc->base;
err1:
- of_node_put(gpio_np);
+ of_node_put(gpiospec.np);
err0:
pr_debug("%s exited with status %d\n", __func__, ret);
return ret;
@@ -105,8 +100,8 @@ unsigned int of_gpio_count(struct device_node *np)
do {
int ret;
- ret = of_parse_phandles_with_args(np, "gpios", "#gpio-cells",
- cnt, NULL, NULL);
+ ret = of_parse_phandle_with_args(np, "gpios", "#gpio-cells",
+ cnt, NULL);
/* A hole in the gpios = <> counts anyway. */
if (ret < 0 && ret != -EEXIST)
break;
@@ -127,12 +122,9 @@ EXPORT_SYMBOL(of_gpio_count);
* gpio chips. This function performs only one sanity check: whether gpio
* is less than ngpios (that is specified in the gpio_chip).
*/
-int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
- const void *gpio_spec, u32 *flags)
+int of_gpio_simple_xlate(struct gpio_chip *gc,
+ const struct of_phandle_args *gpiospec, u32 *flags)
{
- const __be32 *gpio = gpio_spec;
- const u32 n = be32_to_cpup(gpio);
-
/*
* We're discouraging gpio_cells < 2, since that way you'll have to
* write your own xlate function (that will have to retrive the GPIO
@@ -144,13 +136,16 @@ int of_gpio_simple_xlate(struct gpio_chip *gc, struct device_node *np,
return -EINVAL;
}
- if (n > gc->ngpio)
+ if (WARN_ON(gpiospec->args_count < gc->of_gpio_n_cells))
+ return -EINVAL;
+
+ if (gpiospec->args[0] > gc->ngpio)
return -EINVAL;
if (flags)
- *flags = be32_to_cpu(gpio[1]);
+ *flags = gpiospec->args[1];
- return n;
+ return gpiospec->args[0];
}
EXPORT_SYMBOL(of_gpio_simple_xlate);
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