On Fri, Mar 01, 2024 at 04:34:58PM +0100, Romain Gantois wrote:
> From: Russell King <linux@xxxxxxxxxxxxxxx>
>
> Some MAC controllers (e.g. stmmac) require their connected PHY to
> continuously provide a receive clock signal. This can cause issues in two
> cases:
>
> 1. The clock signal hasn't been started yet by the time the MAC driver
> initializes its hardware. This can make the initialization fail, as in
> the case of the rzn1 GMAC1 driver.
> 2. The clock signal is cut during a power saving event. By the time the
> MAC is brought back up, the clock signal is still not active since
> phylink_start hasn't been called yet. This brings us back to case 1.
>
> If a PHY driver reads this flag, it should ensure that the receive clock
> signal is started as soon as possible, and that it isn't brought down when
> the PHY goes into suspend.
>
> Signed-off-by: Russell King <linux@xxxxxxxxxxxxxxx>
> [rgantois: commit log]
> Signed-off-by: Romain Gantois <romain.gantois@xxxxxxxxxxx>
Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
Andrew
