dany/u-boot-megous
1
0
Fork 0
mirror of https://xff.cz/git/u-boot/ synced 2025-09-01 08:42:12 +02:00
Code Issues Packages Projects Releases Wiki Activity

dm: gpio: add a default gpio xlate routine

Browse Source 
Many drivers use a common form of offset + flags for device
tree nodes. e.g.:
	<&gpio1 2 GPIO_ACTIVE_LOW>

This patch adds a common implementation of this type of parsing
and calls it when a gpio driver doesn't supply its' own xlate
routine.

This will allow removal of the driver-specific versions in a
handful of drivers and simplify the addition of new drivers.

Signed-off-by: Eric Nelson <eric@nelint.com>
Reviewed-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
This commit is contained in:
Eric Nelson
2016-04-24 16:32:40 -07:00
committed by Simon Glass
parent c0c62d9233
commit 6c880b7719
2 changed files with 37 additions and 12 deletions
Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/gpio/gpio-uclass.c
View File

@@ -6,6 +6,7 @@
#include <common.h>
#include <dm.h>
#include <dt-bindings/gpio/gpio.h>
#include <errno.h>
#include <fdtdec.h>
#include <malloc.h>
@@ -113,19 +114,33 @@ int gpio_lookup_name(const char *name, struct udevice **devp,
return 0;
}
int gpio_xlate_offs_flags(struct udevice *dev,
struct gpio_desc *desc,
struct fdtdec_phandle_args *args)
{
if (args->args_count < 1)
return -EINVAL;
desc->offset = args->args[0];
if (args->args_count < 2)
return 0;
if (args->args[1] & GPIO_ACTIVE_LOW)
desc->flags = GPIOD_ACTIVE_LOW;
return 0;
}
static int gpio_find_and_xlate(struct gpio_desc *desc,
struct fdtdec_phandle_args *args)
{
struct dm_gpio_ops *ops = gpio_get_ops(desc->dev);
/* Use the first argument as the offset by default */
if (args->args_count > 0)
desc->offset = args->args[0];
if (ops->xlate)
return ops->xlate(desc->dev, desc, args);
else
desc->offset = -1;
desc->flags = 0;
return ops->xlate ? ops->xlate(desc->dev, desc, args) : 0;
return gpio_xlate_offs_flags(desc->dev, desc, args);
}
int dm_gpio_request(struct gpio_desc *desc, const char *label)
@@ -605,6 +620,7 @@ static int _gpio_request_by_name_nodev(const void *blob, int node,
desc->dev = NULL;
desc->offset = 0;
desc->flags = 0;
ret = fdtdec_parse_phandle_with_args(blob, node, list_name,
"#gpio-cells", 0, index, &args);
if (ret) {