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/freebsd/share/man/man4/
H A Dng_l2cap.41 .\" Copyright (c) 2001-2002 Maksim Yevmenkin <m_evmenkin@yahoo.com>
45 L2CAP provides connection-oriented and connectionless data services to upper
52 .Bl -enum -offset indent
60 The Baseband always provides the impression of full-duplex communication
62 This does not imply that all L2CAP communications are bi-directional.
66 L2CAP provides a reliable channel using the mechanisms available at the
78 Each channel is bound to a single protocol in a many-to-one fashion.
79 Multiple
80 channels can be bound to the same protocol, but a channel cannot be bound to
81 multiple protocols.
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H A Dpwmc.435 .Bd -ragged -offset indent
43 .Bd -literal -offset indent
49 driver provides device-control access to a channel of PWM hardware.
52 device is associated with a single PWM output channel.
54 Some PWM hardware is organized with multiple channels sharing a
58 instance will exist for each channel, but changing the period or
59 duty cycle of any one channel may affect other channels within the
73 is the channel number within that hardware controller.
80 driver provides control of a PWM channel with the following
84 .Bl -tag -width indent
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H A Dpcm.42 .\" Copyright (c) 2009-2011 Joel Dahl <joel@FreeBSD.org>
39 .Bd -ragged -offset indent
60 driver are: multichannel audio, per-application
74 .Bl -bullet -compact
118 .Xr snd_uaudio 4 (auto-loaded on device plug)
145 .Bl -tag -width ".Va snd_driver_load" -offset indent
165 set the channel to the preferred value using hints, e.g.:
167 This will mute the input channel per default.
177 re-routing of channels.
198 Commonly used for ear-candy or frequency compensation due to the vast
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H A Dads111x.435 .Bd -ragged -offset indent
42 .Bd -literal -offset indent
60 .Va dev.ads111x.<unit>.<channel>.voltage
61 variable is accessed for a given channel, the driver switches the
62 chip's internal mux to choose the right input pins for that channel,
73 For devices that support multiple input pins, the device datasheet
75 making either single-ended or differential measurements.
79 driver models that by creating a separate output channel for each of
82 the voltage variable for the channel number that corresponds the mux
86 When there is no channel config data, it creates all eight possible
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H A Dsnd_uaudio.439 .Bd -ragged -offset indent
48 .Bd -literal -offset indent
60 If the device supports multiple configurations, and there have been no
61 user-supplied values specified through the
79 For a change to take effect during runtime, the device has to be re-attached.
80 .Bl -tag -width indent
90 Set this to select a smaller sample size if the device supports multiple sample
96 A value of 0 sets the sample channels to the maximum supported channel number.
98 Set this to select a smaller channel number if the device supports multiple
99 channel configurations.
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H A Dioat.434 .Bd -ragged -offset indent
40 .Bd -literal -offset indent
148 Operations on a single channel proceed sequentially.
150 Blockfill operations can be used to write a 64-bit pattern to memory.
160 For example, a user might submit multiple operations to the same channel and
163 The hardware can delay and coalesce interrupts on a given channel for a
167 Software can control this on a per-channel basis with the
177 All operations are safe to use in a non-blocking context with the
210 By accumulating over multiple descriptors, a user may gather a CRC over several
242 argument to either routine is non-NULL, the CRC32C engine is initialized with
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/freebsd/share/man/man9/
H A Dpwmbus.941 .Fn PWMBUS_CHANNEL_CONFIG "device_t bus" "u_int channel" "u_int period" "u_int duty"
45 .Fn PWMBUS_CHANNEL_ENABLE "device_t bus" "u_int channel" "bool enable"
47 .Fn PWMBUS_CHANNEL_GET_CONFIG "device_t bus" "u_int channel" "u_int *period" "u_int *duty"
49 .Fn PWMBUS_CHANNEL_GET_FLAGS "device_t bus" "u_int channel" "uint32_t *flags"
51 .Fn PWMBUS_CHANNEL_IS_ENABLED "device_t bus" "u_int channel" "bool *enabled"
53 .Fn PWMBUS_CHANNEL_SET_FLAGS "device_t bus" "u_int channel" "uint32_t flags"
55 The PWMBUS (Pulse-Width Modulation) interface allows a device driver to
63 argument is the duration in nanoseconds of one complete on-off cycle, and the
67 Some PWM hardware is organized as a single controller with multiple channels.
68 Channel numbers count up from zero.
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H A Dieee80211_proto.959 such as scanning for a BSS or automatically selecting a channel to
61 When multiple vaps are operational the state machines are used to
62 coordinate operation such as choosing a channel.
68 .Bl -tag -width IEEE80211_S_ASSOC
76 Scanning for a BSS or choosing a channel to operate on.
98 Doing Channel Availability Check (CAC).
99 This state is entered only when DFS is enabled and the channel selected
120 Channel Switch Announcement (CSA) is pending.
124 or the local station is preparing to change channel.
144 that specifies the channel for the operating BSS should never be used
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H A Dieee80211.972 layer for protocol services but devices that off-load functionality
83 Devices that can support multiple concurrent interfaces allow
84 multiple vaps to be cloned.
87 or multiple AP vaps, each with a different security model.
91 and coordinates vap state changes including scheduling multiple vaps.
92 State that is not virtualized includes the current channel and
138 (specified in MHz) to an IEEE 802.11 channel number.
151 function converts the channel specified in
153 to an IEEE channel number for the driver
164 utility function converts the IEEE channel number
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/freebsd/sys/contrib/device-tree/Bindings/memory-controllers/ddr/
H A Djedec,lpddr-channel.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/memory-controllers/ddr/jedec,lpddr-channel.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: LPDDR channel with chip/rank topology description
10 An LPDDR channel is a completely independent set of LPDDR pins (DQ, CA, CS,
16 - Julius Werner <jwerner@chromium.org>
21 - jedec,lpddr2-channel
22 - jedec,lpddr3-channel
23 - jedec,lpddr4-channel
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/freebsd/sys/contrib/device-tree/Bindings/sound/
H A Dfsl,rpmsg.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Shengjiu Wang <shengjiu.wang@nxp.com>
15 Linux side is a device which provides audio service by rpmsg channel.
18 Cortex-A and Cortex-M.
21 - $ref: sound-card-common.yaml#
26 - fsl,imx7ulp-rpmsg-audio
27 - fsl,imx8mn-rpmsg-audio
28 - fsl,imx8mm-rpmsg-audio
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H A Dti,pcm6240.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 # Copyright (C) 2022 - 2024 Texas Instruments Incorporated
4 ---
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 - Shenghao Ding <shenghao-ding@ti.com>
24 https://www.ti.com/lit/gpn/pcm3120-q1
25 https://www.ti.com/lit/gpn/pcm3140-q1
26 https://www.ti.com/lit/gpn/pcm5120-q1
27 https://www.ti.com/lit/gpn/pcm6120-q1
28 https://www.ti.com/lit/gpn/pcm6260-q1
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H A Dsamsung-i2s.yaml1 # SPDX-License-Identifier: GPL-2.0
3 ---
4 $id: http://devicetree.org/schemas/sound/samsung-i2s.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Krzysztof Kozlowski <krzk@kernel.org>
11 - Sylweste
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/freebsd/sys/contrib/device-tree/Bindings/spi/
H A Dspi-sprd-adi.txt3 ADI is the abbreviation of Anolog-Digital interface, which is used to access
12 which means we can just link one analog chip address to one hardware channel,
13 then users can access the mapped analog chip address by this hardware channel
16 Thus we introduce one property named "sprd,hw-channels" to configure hardware
17 channels, the first value specifies the hardware channel id which is used to
21 Since we have multi-subsystems will use unique ADI to access analog chip, when
26 Then we need one hardware spinlock to synchronize between the multiple subsystems.
28 The new version ADI controller supplies multiple master channels for different
34 - compatible: Should be "sprd,sc9860-adi".
35 - reg: Offset and length of ADI-SPI controller register space.
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H A Dsprd,spi-adi.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/spi/sprd,spi-adi.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Orson Zhai <orsonzhai@gmail.com>
11 - Baolin Wang <baolin.wang7@gmail.com>
12 - Chunyan Zhang <zhang.lyra@gmail.com>
15 ADI is the abbreviation of Anolog-Digital interface, which is used to access
24 which means we can just link one analog chip address to one hardware channel,
25 then users can access the mapped analog chip address by this hardware channel
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/freebsd/contrib/ofed/libibverbs/man/
H A Dibv_create_comp_channel.31 .\" -*- nroff -*-
2 .\" Licensed under the OpenIB.org BSD license (FreeBSD Variant) - See COPYING.md
4 .TH IBV_CREATE_COMP_CHANNEL 3 2006-10-31 libibverbs "Libibverbs Programmer's Manual"
6 ibv_create_comp_channel, ibv_destroy_comp_channel \- create or
7 destroy a completion event channel
15 .BI "int ibv_destroy_comp_channel(struct ibv_comp_channel " "*channel" );
19 creates a completion event channel for the RDMA device context
23 destroys the completion event channel
24 .I channel\fR.
27 returns a pointer to the created completion event channel, or NULL if the request fails.
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/freebsd/lib/geom/multipath/
H A Dgmultipath.8111 method uses on-disk metadata to detect device and all its paths.
121 .Bl -tag -width ".Cm destroy"
125 method without writing any on-disk metadata.
139 Label the first given provider with on-disk metadata using the specified
207 .Bl -tag -width indent
220 This is a multiple path architecture with no device knowledge or
223 in selecting providers that do indeed represent multiple paths to the
226 criteria across multiple underlying transport types that can
231 For example, if you use the World Wide Port Name of a Fibre Channel
238 could lead you to believe incorrectly that you have found multiple
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/freebsd/sys/contrib/vchiq/interface/vchi/message_drivers/
H A Dmessage.h2 * Copyright (c) 2010-2012 Broadcom. All rights reserved.
13 * 3. The names of the above-listed copyright holders may not be used
61 …MESSAGE_TX_CHANNEL_BULK = 1 // drivers may provide multiple bulk channels, from 1 upw…
65 …_BULK_PREV(c) (MESSAGE_TX_CHANNEL_BULK+((c)-MESSAGE_TX_CHANNEL_BULK+VCHI_MAX_BULK_TX_CHANNELS_PER_…
66 #define MESSAGE_TX_CHANNEL_BULK_NEXT(c) (MESSAGE_TX_CHANNEL_BULK+((c)-MESSAGE_TX_CHANNEL_BULK+1)%VC…
71 …MESSAGE_RX_CHANNEL_BULK = 1 // drivers may provide multiple bulk channels, from 1 upw…
95 // The message driver no longer needs to know about the fields of RX_BULK_SLOTINFO_T - sort this ou…
96 // In particular, it mustn't use addr and len - they're the client buffer, but the message
114 /* ----------------------------------------------------------------------
118 * this means there will be multiple queues (single linked lists)
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/freebsd/sys/contrib/device-tree/Bindings/mailbox/
H A Darm,mhuv3.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Sudeep Holla <sudeep.holla@arm.com>
11 - Cristian Marussi <cristian.marussi@arm.com>
27 - Configure the MHU
28 - Send Transfers to the Receiver
29 - Optionally receive acknowledgment of a Transfer from the Receiver
32 - Configure the MHU
33 - Receive Transfers from the Sender
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H A Dti,omap-mailbox.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/mailbox/ti,omap-mailbo
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/freebsd/sys/contrib/device-tree/Bindings/display/
H A Dmipi-dsi-bus.txt8 This document describes DSI bus-specific properties only or defines existing
25 - #address-cells: The number of cells required to represent an address on the
26 bus. DSI peripherals are addressed using a 2-bit virtual channel number, so
29 - #size-cells: Should be 0. There are cases where it makes sense to use a
33 - clock-master: boolean. Should be enabled if the host is being used in
43 ------------------------------------------------------
49 device-specific properties.
52 - reg: The virtual channel number of a DSI peripheral. Must be in the range
55 Some DSI peripherals respond to more than a single virtual channel. In that
57 - The reg property can take multiple entries, one for each virtual channel
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/freebsd/usr.sbin/pwm/
H A Dpwm.847 Some PWM hardware supports multiple output channels within a single
50 instance controls a single PWM channel.
59 is the channel number within that unit.
62 .Bl -tag -width "-f device"
72 Show the configuration of the PWM channel.
74 Disable the PWM channel.
76 Configure the duty cycle (in nanoseconds or percentage) of the PWM channel.
81 Enable the PWM channel.
83 Configure the period (in nanoseconds) of the PWM channel.
88 .Bl -bullet
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/freebsd/sys/contrib/device-tree/Bindings/iio/
H A Diio-bindings.txt2 from Lars-Peter Clausen [1].
10 value of a #io-channel-cells property in the IIO provider node.
12 [1] https://marc.info/?l=linux-iio&m=135902119507483&w=2
17 #io-channel-cells: Number of cells in an IIO specifier; Typically 0 for nodes
18 with a single IIO output and 1 for nodes with multiple
27 adc: voltage-sensor@35 {
30 #io-channel-cells = <1>;
37 compatible = "some-vendor,some-adc";
40 adc1: iio-device@0 {
41 #io-channel-cells = <1>;
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/freebsd/sys/contrib/device-tree/Bindings/net/wireless/
H A Dmediatek,mt76.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
2 # Copyright (c) 2018-2019 The Linux Foundation. All rights reserved.
4 ---
6 $schema: http://devicetree.org/meta-schemas/core.yaml#
11 - Felix Fietkau <nbd@nbd.name>
12 - Lorenzo Bianconi <lorenzo@kernel.org>
13 - Ryder Lee <ryder.lee@mediatek.com>
25 - mediatek,mt76
26 - mediatek,mt7628-wmac
27 - mediatek,mt7622-wmac
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/freebsd/sys/contrib/device-tree/Bindings/iio/adc/
H A Dbrcm,iproc-static-adc.txt8 - compatible: Must be "brcm,iproc-static-adc"
10 - adc-syscon: Handler of syscon node defining physical base address of the
13 - #io-channel-cells = <1>; As ADC has multiple outputs
14 refer to Documentation/devicetree/bindings/iio/iio-bindings.txt for details.
16 - io-channel-ranges:
17 refer to Documentation/devicetree/bindings/iio/iio-bindings.txt for details.
19 - clocks: Clock used for this block.
21 - clock-names: Clock name should be given as tsc_clk.
23 - interrupts: interrupt line number.
28 compatible = "brcm,iproc-ts-adc-syscon","syscon";
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