phy: core: document phy_calibrate()

Commit 36914111e6 ("drivers: phy: add calibrate method") added support
for generic phy_calibrate() method, but it didn't explain in detail when
such method is supposed to be called. Add some more documentation directly
to the phy.h to make it clean that it is intended to be called after every
host controller reset.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
This commit is contained in:
Marek Szyprowski 2019-07-22 19:32:23 +02:00 committed by Kishon Vijay Abraham I
parent beae796d66
commit bbae18f0fc

View File

@ -394,6 +394,16 @@ int phy_reset(struct phy *phy)
}
EXPORT_SYMBOL_GPL(phy_reset);
/**
* phy_calibrate() - Tunes the phy hw parameters for current configuration
* @phy: the phy returned by phy_get()
*
* Used to calibrate phy hardware, typically by adjusting some parameters in
* runtime, which are otherwise lost after host controller reset and cannot
* be applied in phy_init() or phy_power_on().
*
* Returns: 0 if successful, an negative error code otherwise
*/
int phy_calibrate(struct phy *phy)
{
int ret;