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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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19
include/reset-uclass.h
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@@ -76,6 +76,25 @@ struct reset_ops {
* @return 0 if OK, or a negative error code.
*/
int (*rst_deassert)(struct reset_ctl *reset_ctl);
/**
* rst_reset - Reset a HW module.
*
* This optional function triggers a reset pulse on the reset line.
* If not implemented, reset_reset() falls back to rst_assert(),
* udelay(@delay_us), then rst_deassert(); that delay is therefore
* observed only on the fallback path.
*
* When rst_reset is provided, @delay_us is controller-specific: the
* implementation should honour it if the hardware needs a minimum
* assertion time before release. It may ignore @delay_us when the
* pulse shape is fixed elsewhere (for example a firmware pulse).
*
* @reset_ctl: The reset signal to pulse.
* @delay_us: Minimum delay in microseconds between assert and
* deassert where applicable; see above.
* @return 0 if OK, or a negative error code.
*/
int (*rst_reset)(struct reset_ctl *reset_ctl, ulong delay_us);
/**
* rst_status - Check reset signal status.
*