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authorOlliver Schinagl <oliver@schinagl.nl>2015-01-21 22:33:46 +0100
committerLinus Walleij <linus.walleij@linaro.org>2015-03-04 13:58:58 +0100
commit1feb57a245a4910b03202a814ffc51a900bd4aca (patch)
treeaa32b4a6ceb8132a7c89c4edae70ea83a7cbc1a0 /drivers/gpio/devres.c
parentb80eef95beb04760629822fa130aeed54cdfafca (diff)
downloadop-kernel-dev-1feb57a245a4910b03202a814ffc51a900bd4aca.zip
op-kernel-dev-1feb57a245a4910b03202a814ffc51a900bd4aca.tar.gz
gpio: add parameter to allow the use named gpios
The gpio binding document says that new code should always use named gpios. Patch 40b73183 added support to parse a list of gpios from child nodes, but does not make it possible to use named gpios. This patch adds the con_id property and implements it is done in gpiolib.c, where the old-style of using unnamed gpios still works. Signed-off-by: Olliver Schinagl <oliver@schinagl.nl> Acked-by: Bryan Wu <cooloney@gmail.com> Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio/devres.c')
-rw-r--r--drivers/gpio/devres.c18
1 files changed, 17 insertions, 1 deletions
diff --git a/drivers/gpio/devres.c b/drivers/gpio/devres.c
index 13dbd3d..12c2082 100644
--- a/drivers/gpio/devres.c
+++ b/drivers/gpio/devres.c
@@ -111,23 +111,39 @@ EXPORT_SYMBOL(__devm_gpiod_get_index);
/**
* devm_get_gpiod_from_child - get a GPIO descriptor from a device's child node
* @dev: GPIO consumer
+ * @con_id: function within the GPIO consumer
* @child: firmware node (child of @dev)
*
* GPIO descriptors returned from this function are automatically disposed on
* driver detach.
*/
struct gpio_desc *devm_get_gpiod_from_child(struct device *dev,
+ const char *con_id,
struct fwnode_handle *child)
{
+ static const char const *suffixes[] = { "gpios", "gpio" };
+ char prop_name[32]; /* 32 is max size of property name */
struct gpio_desc **dr;
struct gpio_desc *desc;
+ unsigned int i;
dr = devres_alloc(devm_gpiod_release, sizeof(struct gpio_desc *),
GFP_KERNEL);
if (!dr)
return ERR_PTR(-ENOMEM);
- desc = fwnode_get_named_gpiod(child, "gpios");
+ for (i = 0; i < ARRAY_SIZE(suffixes); i++) {
+ if (con_id)
+ snprintf(prop_name, sizeof(prop_name), "%s-%s",
+ con_id, suffixes[i]);
+ else
+ snprintf(prop_name, sizeof(prop_name), "%s",
+ suffixes[i]);
+
+ desc = fwnode_get_named_gpiod(child, prop_name);
+ if (!IS_ERR(desc) || (PTR_ERR(desc) == -EPROBE_DEFER))
+ break;
+ }
if (IS_ERR(desc)) {
devres_free(dr);
return desc;
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