diff options
Diffstat (limited to 'Documentation/driver-api')
| -rw-r--r-- | Documentation/driver-api/device_link.rst | 12 | ||||
| -rw-r--r-- | Documentation/driver-api/dma-buf.rst | 6 | ||||
| -rw-r--r-- | Documentation/driver-api/firmware/fallback-mechanisms.rst | 7 | ||||
| -rw-r--r-- | Documentation/driver-api/fpga/fpga-mgr.rst | 12 | ||||
| -rw-r--r-- | Documentation/driver-api/fpga/fpga-region.rst | 12 | ||||
| -rw-r--r-- | Documentation/driver-api/fpga/intro.rst | 14 | ||||
| -rw-r--r-- | Documentation/driver-api/infrastructure.rst | 4 | ||||
| -rw-r--r-- | Documentation/driver-api/mtdnand.rst | 4 | ||||
| -rw-r--r-- | Documentation/driver-api/slimbus.rst | 5 | ||||
| -rw-r--r-- | Documentation/driver-api/usb/typec_bus.rst | 136 |
10 files changed, 184 insertions, 28 deletions
diff --git a/Documentation/driver-api/device_link.rst b/Documentation/driver-api/device_link.rst index 70e328e16aad..d6763272e747 100644 --- a/Documentation/driver-api/device_link.rst +++ b/Documentation/driver-api/device_link.rst @@ -81,10 +81,14 @@ integration is desired. Two other flags are specifically targeted at use cases where the device link is added from the consumer's ``->probe`` callback: ``DL_FLAG_RPM_ACTIVE`` can be specified to runtime resume the supplier upon addition of the -device link. ``DL_FLAG_AUTOREMOVE`` causes the device link to be automatically -purged when the consumer fails to probe or later unbinds. This obviates -the need to explicitly delete the link in the ``->remove`` callback or in -the error path of the ``->probe`` callback. +device link. ``DL_FLAG_AUTOREMOVE_CONSUMER`` causes the device link to be +automatically purged when the consumer fails to probe or later unbinds. +This obviates the need to explicitly delete the link in the ``->remove`` +callback or in the error path of the ``->probe`` callback. + +Similarly, when the device link is added from supplier's ``->probe`` callback, +``DL_FLAG_AUTOREMOVE_SUPPLIER`` causes the device link to be automatically +purged when the supplier fails to probe or later unbinds. Limitations =========== diff --git a/Documentation/driver-api/dma-buf.rst b/Documentation/driver-api/dma-buf.rst index dc384f2f7f34..b541e97c7ab1 100644 --- a/Documentation/driver-api/dma-buf.rst +++ b/Documentation/driver-api/dma-buf.rst @@ -131,6 +131,12 @@ DMA Fences ---------- .. kernel-doc:: drivers/dma-buf/dma-fence.c + :doc: DMA fences overview + +DMA Fences Functions Reference +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +.. kernel-doc:: drivers/dma-buf/dma-fence.c :export: .. kernel-doc:: include/linux/dma-fence.h diff --git a/Documentation/driver-api/firmware/fallback-mechanisms.rst b/Documentation/driver-api/firmware/fallback-mechanisms.rst index d35fed65eae9..8b041d0ab426 100644 --- a/Documentation/driver-api/firmware/fallback-mechanisms.rst +++ b/Documentation/driver-api/firmware/fallback-mechanisms.rst @@ -92,7 +92,7 @@ the loading file. The firmware device used to help load firmware using sysfs is only created if direct firmware loading fails and if the fallback mechanism is enabled for your -firmware request, this is set up with fw_load_from_user_helper(). It is +firmware request, this is set up with :c:func:`firmware_fallback_sysfs`. It is important to re-iterate that no device is created if a direct filesystem lookup succeeded. @@ -108,6 +108,11 @@ firmware_data_read() and firmware_loading_show() are just provided for the test_firmware driver for testing, they are not called in normal use or expected to be used regularly by userspace. +firmware_fallback_sysfs +----------------------- +.. kernel-doc:: drivers/base/firmware_loader/fallback.c + :functions: firmware_fallback_sysfs + Firmware kobject uevent fallback mechanism ========================================== diff --git a/Documentation/driver-api/fpga/fpga-mgr.rst b/Documentation/driver-api/fpga/fpga-mgr.rst index bcf2dd24e179..4b3825da48d9 100644 --- a/Documentation/driver-api/fpga/fpga-mgr.rst +++ b/Documentation/driver-api/fpga/fpga-mgr.rst @@ -83,7 +83,7 @@ The programming sequence is:: 3. .write_complete The .write_init function will prepare the FPGA to receive the image data. The -buffer passed into .write_init will be atmost .initial_header_size bytes long, +buffer passed into .write_init will be at most .initial_header_size bytes long; if the whole bitstream is not immediately available then the core code will buffer up at least this much before starting. @@ -98,9 +98,9 @@ scatter list. This interface is suitable for drivers which use DMA. The .write_complete function is called after all the image has been written to put the FPGA into operating mode. -The ops include a .state function which will read the hardware FPGA manager and -return a code of type enum fpga_mgr_states. It doesn't result in a change in -hardware state. +The ops include a .state function which will determine the state the FPGA is in +and return a code of type enum fpga_mgr_states. It doesn't result in a change +in state. How to write an image buffer to a supported FPGA ------------------------------------------------ @@ -181,8 +181,8 @@ API for implementing a new FPGA Manager driver .. kernel-doc:: drivers/fpga/fpga-mgr.c :functions: fpga_mgr_unregister -API for programming a FPGA --------------------------- +API for programming an FPGA +--------------------------- .. kernel-doc:: include/linux/fpga/fpga-mgr.h :functions: fpga_image_info diff --git a/Documentation/driver-api/fpga/fpga-region.rst b/Documentation/driver-api/fpga/fpga-region.rst index f89e4a311722..f30333ce828e 100644 --- a/Documentation/driver-api/fpga/fpga-region.rst +++ b/Documentation/driver-api/fpga/fpga-region.rst @@ -4,7 +4,7 @@ FPGA Region Overview -------- -This document is meant to be an brief overview of the FPGA region API usage. A +This document is meant to be a brief overview of the FPGA region API usage. A more conceptual look at regions can be found in the Device Tree binding document [#f1]_. @@ -31,11 +31,11 @@ fpga_image_info including: * pointers to the image as either a scatter-gather buffer, a contiguous buffer, or the name of firmware file - * flags indicating specifics such as whether the image if for partial + * flags indicating specifics such as whether the image is for partial reconfiguration. -How to program a FPGA using a region ------------------------------------- +How to program an FPGA using a region +------------------------------------- First, allocate the info struct:: @@ -77,8 +77,8 @@ An example of usage can be seen in the probe function of [#f2]_. .. [#f1] ../devicetree/bindings/fpga/fpga-region.txt .. [#f2] ../../drivers/fpga/of-fpga-region.c -API to program a FGPA ---------------------- +API to program an FPGA +---------------------- .. kernel-doc:: drivers/fpga/fpga-region.c :functions: fpga_region_program_fpga diff --git a/Documentation/driver-api/fpga/intro.rst b/Documentation/driver-api/fpga/intro.rst index 51cd81dbb4dc..50d1cab84950 100644 --- a/Documentation/driver-api/fpga/intro.rst +++ b/Documentation/driver-api/fpga/intro.rst @@ -12,18 +12,18 @@ Linux. Some of the core intentions of the FPGA subsystems are: * Code should not be shared between upper and lower layers. This should go without saying. If that seems necessary, there's probably - framework functionality that that can be added that will benefit + framework functionality that can be added that will benefit other users. Write the linux-fpga mailing list and maintainers and seek out a solution that expands the framework for broad reuse. -* Generally, when adding code, think of the future. Plan for re-use. +* Generally, when adding code, think of the future. Plan for reuse. The framework in the kernel is divided into: FPGA Manager ------------ -If you are adding a new FPGA or a new method of programming a FPGA, +If you are adding a new FPGA or a new method of programming an FPGA, this is the subsystem for you. Low level FPGA manager drivers contain the knowledge of how to program a specific device. This subsystem includes the framework in fpga-mgr.c and the low level drivers that @@ -32,10 +32,10 @@ are registered with it. FPGA Bridge ----------- -FPGA Bridges prevent spurious signals from going out of a FPGA or a -region of a FPGA during programming. They are disabled before +FPGA Bridges prevent spurious signals from going out of an FPGA or a +region of an FPGA during programming. They are disabled before programming begins and re-enabled afterwards. An FPGA bridge may be -actual hard hardware that gates a bus to a cpu or a soft ("freeze") +actual hard hardware that gates a bus to a CPU or a soft ("freeze") bridge in FPGA fabric that surrounds a partial reconfiguration region of an FPGA. This subsystem includes fpga-bridge.c and the low level drivers that are registered with it. @@ -44,7 +44,7 @@ FPGA Region ----------- If you are adding a new interface to the FPGA framework, add it on top -of a FPGA region to allow the most reuse of your interface. +of an FPGA region to allow the most reuse of your interface. The FPGA Region framework (fpga-region.c) associates managers and bridges as reconfigurable regions. A region may refer to the whole diff --git a/Documentation/driver-api/infrastructure.rst b/Documentation/driver-api/infrastructure.rst index bee1b9a1702f..6172f3cc3d0b 100644 --- a/Documentation/driver-api/infrastructure.rst +++ b/Documentation/driver-api/infrastructure.rst @@ -49,10 +49,10 @@ Device Drivers Base Device Drivers DMA Management ----------------------------- -.. kernel-doc:: drivers/base/dma-coherent.c +.. kernel-doc:: kernel/dma/coherent.c :export: -.. kernel-doc:: drivers/base/dma-mapping.c +.. kernel-doc:: kernel/dma/mapping.c :export: Device drivers PnP support diff --git a/Documentation/driver-api/mtdnand.rst b/Documentation/driver-api/mtdnand.rst index dcd63599f700..c55a6034c397 100644 --- a/Documentation/driver-api/mtdnand.rst +++ b/Documentation/driver-api/mtdnand.rst @@ -374,7 +374,7 @@ The nand driver supports three different types of hardware ECC. - NAND_ECC_HW8_512 - Hardware ECC generator providing 6 bytes ECC per 512 byte. + Hardware ECC generator providing 8 bytes ECC per 512 byte. If your hardware generator has a different functionality add it at the appropriate place in nand_base.c @@ -889,7 +889,7 @@ Use these constants to select the ECC algorithm:: #define NAND_ECC_HW3_512 3 /* Hardware ECC 6 byte ECC per 512 Byte data */ #define NAND_ECC_HW6_512 4 - /* Hardware ECC 6 byte ECC per 512 Byte data */ + /* Hardware ECC 8 byte ECC per 512 Byte data */ #define NAND_ECC_HW8_512 6 diff --git a/Documentation/driver-api/slimbus.rst b/Documentation/driver-api/slimbus.rst index a97449cf603a..410eec79b2a1 100644 --- a/Documentation/driver-api/slimbus.rst +++ b/Documentation/driver-api/slimbus.rst @@ -125,3 +125,8 @@ Messaging APIs: ~~~~~~~~~~~~~~~ .. kernel-doc:: drivers/slimbus/messaging.c :export: + +Streaming APIs: +~~~~~~~~~~~~~~~ +.. kernel-doc:: drivers/slimbus/stream.c + :export: diff --git a/Documentation/driver-api/usb/typec_bus.rst b/Documentation/driver-api/usb/typec_bus.rst new file mode 100644 index 000000000000..d5eec1715b5b --- /dev/null +++ b/Documentation/driver-api/usb/typec_bus.rst @@ -0,0 +1,136 @@ + +API for USB Type-C Alternate Mode drivers +========================================= + +Introduction +------------ + +Alternate modes require communication with the partner using Vendor Defined +Messages (VDM) as defined in USB Type-C and USB Power Delivery Specifications. +The communication is SVID (Standard or Vendor ID) specific, i.e. specific for +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 +modes by using the SVID and the mode number. + +USB Type-C Connector Class provides a device for every alternate mode a port +supports, and separate device for every alternate mode the partner supports. +The drivers for the alternate modes are bound to the partner alternate mode +devices, and the port alternate mode devices must be handled by the port +drivers. + +When a new partner alternate mode device is registered, it is linked to the +alternate mode device of the port that the partner is attached to, that has +matching SVID and mode. Communication between the port driver and alternate mode +driver will happen using the same API. + +The port alternate mode devices are used as a proxy between the partner and the +alternate mode drivers, so the port drivers are only expected to pass the SVID +specific commands from the alternate mode drivers to the partner, and from the +partners to the alternate mode drivers. No direct SVID specific communication is +needed from the port drivers, but the port drivers need to provide the operation +callbacks for the port alternate mode devices, just like the alternate mode +drivers need to provide them for the partner alternate mode devices. + +Usage: +------ + +General +~~~~~~~ + +By default, the alternate mode drivers are responsible for entering the mode. +It is also possible to leave the decision about entering the mode to the user +space (See Documentation/ABI/testing/sysfs-class-typec). Port drivers should not +enter any modes on their own. + +``->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 +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()`. + +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 +needs to notify the bus using :c:func:`typec_altmode_notify()`. The driver +passes the negotiated SVID specific pin configuration value to the function as +parameter. The bus driver will then configure the mux behind the connector using +that value as the state value for the mux, and also call blocking notification +chain to notify the external drivers about the state of the connector that need +to know it. + +NOTE: The SVID specific pin configuration values must always start from +``TYPEC_STATE_MODAL``. USB Type-C specification defines two default states for +the connector: ``TYPEC_STATE_USB`` and ``TYPEC_STATE_SAFE``. These values are +reserved by the bus as the first possible values for the state. When the +alternate mode is entered, the bus will put the connector into +``TYPEC_STATE_SAFE`` before sending Enter or Exit Mode command as defined in USB +Type-C Specification, and also put the connector back to ``TYPEC_STATE_USB`` +after the mode has been exited. + +An example of working definitions for SVID specific pin configurations would +look like this: + +enum { + ALTMODEX_CONF_A = TYPEC_STATE_MODAL, + ALTMODEX_CONF_B, + ... +}; + +Helper macro ``TYPEC_MODAL_STATE()`` can also be used: + +#define ALTMODEX_CONF_A = TYPEC_MODAL_STATE(0); +#define ALTMODEX_CONF_B = TYPEC_MODAL_STATE(1); + +Notification chain +~~~~~~~~~~~~~~~~~~ + +The drivers for the components that the alternate modes are designed for need to +get details regarding the results of the negotiation with the partner, and the +pin configuration of the connector. In case of DisplayPort alternate mode for +example, the GPU drivers will need to know those details. In case of +Thunderbolt alternate mode, the thunderbolt drivers will need to know them, and +so on. + +The notification chain is designed for this purpose. The drivers can register +notifiers with :c:func:`typec_altmode_register_notifier()`. + +Cable plug alternate modes +~~~~~~~~~~~~~~~~~~~~~~~~~~ + +The alternate mode drivers are not bound to cable plug alternate mode devices, +only to the partner alternate mode devices. If the alternate mode supports, or +requires, a cable that responds to SOP Prime, and optionally SOP Double Prime +messages, the driver for that alternate mode must request handle to the cable +plug alternate modes using :c:func:`typec_altmode_get_plug()`, and take over +their control. + +Driver API +---------- + +Alternate mode driver registering/unregistering +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +.. kernel-doc:: drivers/usb/typec/bus.c + :functions: typec_altmode_register_driver typec_altmode_unregister_driver + +Alternate mode driver operations +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ + +.. kernel-doc:: drivers/usb/typec/bus.c + :functions: typec_altmode_enter typec_altmode_exit typec_altmode_attention typec_altmode_vdm typec_altmode_notify + +API for the port drivers +~~~~~~~~~~~~~~~~~~~~~~~~ + +.. kernel-doc:: drivers/usb/typec/bus.c + :functions: typec_match_altmode + +Cable Plug operations +~~~~~~~~~~~~~~~~~~~~~ + +.. kernel-doc:: drivers/usb/typec/bus.c + :functions: typec_altmode_get_plug typec_altmode_put_plug + +Notifications +~~~~~~~~~~~~~ +.. kernel-doc:: drivers/usb/typec/class.c + :functions: typec_altmode_register_notifier typec_altmode_unregister_notifier |