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gpio: dwapb_gpio: Add reset ctrl to driver

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Add code to reset all reset signals as in gpio DT node. A reset property
is an optional feature, so only print out a warning and do not fail if a
reset property is not present.

If a reset property is discovered, then use it to deassert, thus
bringing the IP out of reset.

Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>
This commit is contained in:
Ley Foon Tan 2018-09-04 14:04:58 +08:00 committed by Marek Vasut
parent 71f2700b92
commit db6a158bc3
1 changed files with 49 additions and 2 deletions
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51
drivers/gpio/dwapb_gpio.c
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@ -15,6 +15,7 @@
#include <dm/lists.h>
#include <dm/root.h>
#include <errno.h>
#include <reset.h>
DECLARE_GLOBAL_DATA_PTR;
@ -29,6 +30,10 @@ DECLARE_GLOBAL_DATA_PTR;
#define GPIO_PORTA_EOI 0x4c
#define GPIO_EXT_PORT(p) (0x50 + (p) * 4)
struct gpio_dwapb_priv {
struct reset_ctl_bulk resets;
};
struct gpio_dwapb_platdata {
const char *name;
int bank;
@ -99,13 +104,42 @@ static const struct dm_gpio_ops gpio_dwapb_ops = {
.get_function = dwapb_gpio_get_function,
};
static int gpio_dwapb_reset(struct udevice *dev)
{
int ret;
struct gpio_dwapb_priv *priv = dev_get_priv(dev);
ret = reset_get_bulk(dev, &priv->resets);
if (ret) {
/* Return 0 if error due to !CONFIG_DM_RESET and reset
* DT property is not present.
*/
if (ret == -ENOENT || ret == -ENOTSUPP)
return 0;
dev_warn(dev, "Can't get reset: %d\n", ret);
return ret;
}
ret = reset_deassert_bulk(&priv->resets);
if (ret) {
reset_release_bulk(&priv->resets);
dev_err(dev, "Failed to reset: %d\n", ret);
return ret;
}
return 0;
}
static int gpio_dwapb_probe(struct udevice *dev)
{
struct gpio_dev_priv *priv = dev_get_uclass_priv(dev);
struct gpio_dwapb_platdata *plat = dev->platdata;
if (!plat)
return 0;
if (!plat) {
/* Reset on parent device only */
return gpio_dwapb_reset(dev);
}
priv->gpio_count = plat->pins;
priv->bank_name = plat->name;
@ -166,6 +200,17 @@ err:
return ret;
}
static int gpio_dwapb_remove(struct udevice *dev)
{
struct gpio_dwapb_platdata *plat = dev_get_platdata(dev);
struct gpio_dwapb_priv *priv = dev_get_priv(dev);
if (!plat && priv)
return reset_release_bulk(&priv->resets);
return 0;
}
static const struct udevice_id gpio_dwapb_ids[] = {
{ .compatible = "snps,dw-apb-gpio" },
{ }
@ -178,4 +223,6 @@ U_BOOT_DRIVER(gpio_dwapb) = {
.ops = &gpio_dwapb_ops,
.bind = gpio_dwapb_bind,
.probe = gpio_dwapb_probe,
.remove = gpio_dwapb_remove,
.priv_auto_alloc_size = sizeof(struct gpio_dwapb_priv),
};