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Diffstat (limited to 'Documentation/phy.txt')
| -rw-r--r-- | Documentation/phy.txt | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/Documentation/phy.txt b/Documentation/phy.txt index 0103e4b15b0e..2e24b993e95f 100644 --- a/Documentation/phy.txt +++ b/Documentation/phy.txt @@ -84,6 +84,12 @@ The only difference between the two APIs is that devm_phy_get associates the device with the PHY using devres on successful PHY get. On driver detach, release function is invoked on the the devres data and devres data is freed. +It should be noted that NULL is a valid phy reference. All phy +consumer calls on the NULL phy become NOPs. That is the release calls, +the phy_init() and phy_exit() calls, and phy_power_on() and +phy_power_off() calls are all NOP when applied to a NULL phy. The NULL +phy is useful in devices for handling optional phy devices. + 5. Releasing a reference to the PHY When the controller no longer needs the PHY, it has to release the reference |