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reset: Add reset_reset() and reset_reset_bulk() API

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Add reset_reset() and reset_reset_bulk() functions to the reset
controller API. These functions assert and then deassert reset signals
in a single call, providing a convenient way to pulse/toggle a reset
line.

This mimics the Linux kernel's reset_control_reset() and
reset_control_bulk_reset() APIs. The new functions are useful for
drivers that need to cycle a reset line during initialization or
error recovery but with also passing delay parameter.

If a driver implements the rst_reset op, it will be called directly
with the delay parameter. Otherwise, the reset core performs
reset_assert(), optional udelay(), and reset_deassert() as fallback.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/55ddd313c9e7b2d4dc79ab36bdd0040f871610f6.1779709539.git.michal.simek@amd.com
This commit is contained in:
Michal Simek
2026-05-25 13:45:42 +02:00
parent 4706bd0208
commit 19f7def264
3 changed files with 102 additions and 0 deletions
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34
drivers/reset/reset-uclass.c
View File

@@ -13,6 +13,7 @@
#include <reset-uclass.h>
#include <dm/devres.h>
#include <dm/lists.h>
#include <linux/delay.h>
static inline struct reset_ops *reset_dev_ops(struct udevice *dev)
{
@@ -225,6 +226,39 @@ int reset_deassert_bulk(struct reset_ctl_bulk *bulk)
return 0;
}
int reset_reset(struct reset_ctl *reset_ctl, ulong delay_us)
{
struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);
int ret;
debug("%s(reset_ctl=%p, delay_us=%lu)\n", __func__, reset_ctl,
delay_us);
if (ops->rst_reset)
return ops->rst_reset(reset_ctl, delay_us);
ret = reset_assert(reset_ctl);
if (ret < 0)
return ret;
udelay(delay_us);
return reset_deassert(reset_ctl);
}
int reset_reset_bulk(struct reset_ctl_bulk *bulk, ulong delay_us)
{
int i, ret;
for (i = 0; i < bulk->count; i++) {
ret = reset_reset(&bulk->resets[i], delay_us);
if (ret < 0)
return ret;
}
return 0;
}
int reset_status(struct reset_ctl *reset_ctl)
{
struct reset_ops *ops = reset_dev_ops(reset_ctl->dev);