diff options
| -rw-r--r-- | Documentation/driver-api/dpll.rst | 29 |
1 files changed, 16 insertions, 13 deletions
diff --git a/Documentation/driver-api/dpll.rst b/Documentation/driver-api/dpll.rst index bb52f1b8c0be..69670deb8c4e 100644 --- a/Documentation/driver-api/dpll.rst +++ b/Documentation/driver-api/dpll.rst @@ -119,19 +119,19 @@ with. If a pin was registered with multiple parent pins, they behave like a multiple output multiplexer. In this case output of a ``DPLL_CMD_PIN_GET`` would contain multiple pin-parent nested -attributes with current state related to each parent, like: - -'pin': [{{ - 'clock-id': 282574471561216, - 'module-name': 'ice', - 'capabilities': 4, - 'id': 13, - 'parent-pin': [ - {'parent-id': 2, 'state': 'connected'}, - {'parent-id': 3, 'state': 'disconnected'} - ], - 'type': 'synce-eth-port' - }}] +attributes with current state related to each parent, like:: + + 'pin': [{{ + 'clock-id': 282574471561216, + 'module-name': 'ice', + 'capabilities': 4, + 'id': 13, + 'parent-pin': [ + {'parent-id': 2, 'state': 'connected'}, + {'parent-id': 3, 'state': 'disconnected'} + ], + 'type': 'synce-eth-port' + }}] Only one child pin can provide its signal to the parent MUX-type pin at a time, the selection is done by requesting change of a child pin state @@ -425,6 +425,7 @@ The simplest implementation is in the OCP TimeCard driver. The ops structures are defined like this: .. code-block:: c + static const struct dpll_device_ops dpll_ops = { .lock_status_get = ptp_ocp_dpll_lock_status_get, .mode_get = ptp_ocp_dpll_mode_get, @@ -442,6 +443,7 @@ structures are defined like this: The registration part is then looks like this part: .. code-block:: c + clkid = pci_get_dsn(pdev); bp->dpll = dpll_device_get(clkid, 0, THIS_MODULE); if (IS_ERR(bp->dpll)) { @@ -472,6 +474,7 @@ The registration part is then looks like this part: In the error path we have to rewind every allocation in the reverse order: .. code-block:: c + while (i) { --i; dpll_pin_unregister(bp->dpll, bp->sma[i].dpll_pin, &dpll_pins_ops, &bp->sma[i]); |