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usb: typec: Improve Alt Mode documentation

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Adding the document to the usb index file and fixing a few
references. Also, exposing the code examples as "literal
blocks" so they are more easy to read.

Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Heikki Krogerus 2018-12-18 13:53:08 +03:00 • committed by Greg Kroah-Hartman
parent 54578ee883
commit 28ce553985
3 changed files with 14 additions and 12 deletions
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1
Documentation/driver-api/usb/index.rst
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@ -19,6 +19,7 @@ Linux USB API
dwc3 dwc3
writing_musb_glue_layer writing_musb_glue_layer
typec typec
typec_bus
usb3-debug-port usb3-debug-port
.. only:: subproject and html .. only:: subproject and html

1
Documentation/driver-api/usb/typec.rst
View file

@ -1,3 +1,4 @@
.. _typec:
USB Type-C connector class USB Type-C connector class
========================== ==========================

24
Documentation/driver-api/usb/typec_bus.rst
View file

@ -13,10 +13,10 @@ every alternate mode, so every alternate mode will need a custom driver.
USB Type-C bus allows binding a driver to the discovered partner alternate USB Type-C bus allows binding a driver to the discovered partner alternate
modes by using the SVID and the mode number. modes by using the SVID and the mode number.
USB Type-C Connector Class provides a device for every alternate mode a port :ref:`USB Type-C Connector Class <typec>` provides a device for every alternate
supports, and separate device for every alternate mode the partner supports. mode a port supports, and separate device for every alternate mode the partner
The drivers for the alternate modes are bound to the partner alternate mode supports. The drivers for the alternate modes are bound to the partner alternate
devices, and the port alternate mode devices must be handled by the port mode devices, and the port alternate mode devices must be handled by the port
drivers. drivers.
When a new partner alternate mode device is registered, it is linked to the When a new partner alternate mode device is registered, it is linked to the
@ -46,7 +46,7 @@ enter any modes on their own.
``->vdm`` is the most important callback in the operation callbacks vector. It ``->vdm`` is the most important callback in the operation callbacks vector. It
will be used to deliver all the SVID specific commands from the partner to the will be used to deliver all the SVID specific commands from the partner to the
alternate mode driver, and vice versa in case of port drivers. The drivers send alternate mode driver, and vice versa in case of port drivers. The drivers send
the SVID specific commands to each other using :c:func:`typec_altmode_vmd()`. the SVID specific commands to each other using :c:func:`typec_altmode_vdm()`.
If the communication with the partner using the SVID specific commands results If the communication with the partner using the SVID specific commands results
in need to reconfigure the pins on the connector, the alternate mode driver in need to reconfigure the pins on the connector, the alternate mode driver
@ -67,15 +67,15 @@ Type-C Specification, and also put the connector back to ``TYPEC_STATE_USB``
after the mode has been exited. after the mode has been exited.
An example of working definitions for SVID specific pin configurations would An example of working definitions for SVID specific pin configurations would
look like this: look like this::
enum { enum {
ALTMODEX_CONF_A = TYPEC_STATE_MODAL, ALTMODEX_CONF_A = TYPEC_STATE_MODAL,
ALTMODEX_CONF_B, ALTMODEX_CONF_B,
... ...
}; };
Helper macro ``TYPEC_MODAL_STATE()`` can also be used: Helper macro ``TYPEC_MODAL_STATE()`` can also be used::
#define ALTMODEX_CONF_A = TYPEC_MODAL_STATE(0); #define ALTMODEX_CONF_A = TYPEC_MODAL_STATE(0);
#define ALTMODEX_CONF_B = TYPEC_MODAL_STATE(1); #define ALTMODEX_CONF_B = TYPEC_MODAL_STATE(1);