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/linux/Documentation/devicetree/bindings/serial/
H A Dserial.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Rob Herring <robh@kernel.org>
11 - Greg Kroah-Hartman <gregkh@linuxfoundation.org>
18 Each enabled UART may have an optional "serialN" alias in the "aliases" node,
19 where N is the port number (non-negative decimal integer) as printed on the
28 cts-gpios:
32 the UART's CTS line.
34 dcd-gpios:
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H A Dfsl-imx-uart.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/serial/fsl-imx-uart.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Freescale i.MX Universal Asynchronous Receiver/Transmitter (UART)
10 - Fabio Estevam <festevam@gmail.com>
15 - const: fsl,imx1-uart
16 - const: fsl,imx21-uart
17 - items:
18 - enum:
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H A Dserial-peripheral-props.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/serial/serial-peripheral-props.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
7 title: Common Properties for Serial-attached Devices
10 - Rob Herring <robh@kernel.org>
11 - Greg Kroah-Hartman <gregkh@linuxfoundation.org>
14 Devices connected over serial/UART, expressed as children of a serial
19 max-speed:
28 current-speed:
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/linux/tools/arch/x86/dell-uart-backlight-emulator/
H A DREADME1 Emulator for DELL0501 UART attached backlight controller
2 --------------------------------------------------------
5 board connected to an UART.
7 In DSDT this uart port will be defined as:
12 With the DELL0501 indicating that we are dealing with an UART with
13 the backlight controller board attached.
16 the drivers/platform/x86/dell/dell-uart-backlight.c driver without access
20 1. A (desktop) PC with a 16550 UART on the motherboard and a standard DB9
21 connector connected to this UART.
25 4. A DSDT overlay for the desktop PC replacing the _HID of the 16550 UART
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/linux/drivers/extcon/
H A Dextcon-max8997.c1 // SPDX-License-Identifier: GPL-2.0+
3 // extcon-max8997.c - MAX8997 extcon driver to support MAX8997 MUIC
8 #include <linux/devm-helpers.h>
18 #include <linux/mfd/max8997-private.h>
19 #include <linux/extcon-provider.h>
22 #define DEV_NAME "max8997-muic"
39 { MAX8997_MUICIRQ_ADCError, "muic-ADCERROR" },
40 { MAX8997_MUICIRQ_ADCLow, "muic-ADCLOW" },
41 { MAX8997_MUICIRQ_ADC, "muic-ADC" },
42 { MAX8997_MUICIRQ_VBVolt, "muic-VBVOLT" },
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H A Dextcon-max77693.c1 // SPDX-License-Identifier: GPL-2.0+
3 // extcon-max77693.c - MAX77693 extcon driver to support MAX77693 MUIC
8 #include <linux/devm-helpers.h>
18 #include <linux/mfd/max77693-common.h>
19 #include <linux/mfd/max77693-private.h>
20 #include <linux/extcon-provider.h>
24 #define DEV_NAME "max77693-muic"
30 * extcon-max77693 driver use 'default_init_data' to bring up base operation
35 /* STATUS2 - [3]ChgDetRun */
39 /* INTMASK1 - Unmask [3]ADC1KM,[0]ADCM */
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H A Dextcon-max14577.c1 // SPDX-License-Identifier: GPL-2.0+
3 // extcon-max14577.c - MAX14577/77836 extcon driver to support MUIC
9 #include <linux/devm-helpers.h>
16 #include <linux/mfd/max14577-private.h>
17 #include <linux/extcon-provider.h>
47 { MAX14577_IRQ_INT1_ADC, "muic-ADC" },
48 { MAX14577_IRQ_INT1_ADCLOW, "muic-ADCLOW" },
49 { MAX14577_IRQ_INT1_ADCERR, "muic-ADCError" },
50 { MAX14577_IRQ_INT2_CHGTYP, "muic-CHGTYP" },
51 { MAX14577_IRQ_INT2_CHGDETRUN, "muic-CHGDETRUN" },
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H A Dextcon-max77843.c1 // SPDX-License-Identifier: GPL-2.0+
3 // extcon-max77843.c - Maxim MAX77843 extcon driver to support
9 #include <linux/extcon-provider.h>
13 #include <linux/mfd/max77693-common.h>
14 #include <linux/mfd/max77843-private.h>
141 { MAX77843_MUIC_IRQ_INT1_ADC, "MUIC-ADC" },
142 { MAX77843_MUIC_IRQ_INT1_ADCERROR, "MUIC-ADC_ERROR" },
143 { MAX77843_MUIC_IRQ_INT1_ADC1K, "MUIC-ADC1K" },
144 { MAX77843_MUIC_IRQ_INT2_CHGTYP, "MUIC-CHGTYP" },
145 { MAX77843_MUIC_IRQ_INT2_CHGDETRUN, "MUIC-CHGDETRUN" },
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/linux/drivers/iio/imu/bno055/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
9 tristate "Bosch BNO055 attached via UART"
14 Enable this to support Bosch BNO055 IMUs attached via UART.
20 tristate "Bosch BNO055 attached via I2C bus"
25 Enable this to support Bosch BNO055 IMUs attached via I2C bus.
/linux/drivers/tty/serial/8250/
H A D8250_parisc.c1 // SPDX-License-Identifier: GPL-2.0+
5 * (c) Copyright Matthew Wilcox <willy@debian.org> 2001-2002
18 #include <asm/parisc-device.h>
25 struct uart_8250_port uart; in serial_init_chip() local
30 if (!dev->irq && (dev->id.sversion == 0xad)) in serial_init_chip()
31 dev->irq = iosapic_serial_irq(dev); in serial_init_chip()
34 if (!dev->irq) { in serial_init_chip()
40 if (parisc_parent(dev)->id.hw_type != HPHW_IOA) in serial_init_chip()
41 dev_info(&dev->dev, in serial_init_chip()
44 (unsigned long long)dev->hpa.start); in serial_init_chip()
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/linux/Documentation/devicetree/bindings/net/bluetooth/
H A Dmediatek,bluetooth.txt1 MediaTek UART based Bluetooth Devices
4 This device is a serial attached device to UART device and thus it must be a
5 child node of the serial node with UART.
13 - compatible: Must be
14 "mediatek,mt7663u-bluetooth": for MT7663U device
15 "mediatek,mt7668u-bluetooth": for MT7668U device
16 - vcc-supply: Main voltage regulator
21 - pinctrl-names: Should be "default", "runtime"
22 - pinctrl-0: Should contain UART RXD low when the device is powered up to
24 - pinctrl-1: Should contain UART mode pin ctrl
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H A Dnxp,88w8987-bt.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
4 $id: http://devicetree.org/schemas/net/bluetooth/nxp,88w8987-bt.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 This binding describes UART-attached NXP bluetooth chips. These chips
11 are dual-radio chips supporting WiFi and Bluetooth. The bluetooth
12 works on standard H4 protocol over 4-wire UART. The RTS and CTS lines
14 asserts break signal over UART-TX line to put the chip into power save
15 state. De-asserting break wakes up the BT chip.
18 - Neeraj Sanjay Kale <neeraj.sanjaykale@nxp.com>
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H A Dti,bluetooth.yaml1 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - David Lechner <david@lechnology.com>
14 attached TI Bluetooth devices. The following chips are included in this
20 TI WiLink devices have a UART interface for providing Bluetooth, FM radio,
27 This bindings follows the UART slave device binding in ../serial/serial.yaml.
32 - ti,cc2560
33 - ti,wl1271-st
34 - ti,wl1273-st
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H A Dbrcm,bluetooth.yaml1 # SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
3 ---
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 - Linus Walleij <linus.walleij@linaro.org>
13 This binding describes Broadcom UART-attached bluetooth chips.
18 - items:
19 - enum:
20 - infineon,cyw43439-bt
21 - const: brcm,bcm4329-bt
22 - enum:
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/linux/Documentation/networking/device_drivers/can/
H A Dcan327.rst1 .. SPDX-License-Identifier: (GPL-2.0-only OR BSD-3-Clause)
7 --------
14 -----------
26 -------------
33 order to fake full-duplex operation.
36 enough to implement simple request-response protocols (such as OBD II),
39 Most ELM327s come as nondescript serial devices, attached via USB or
50 -----------
59 ----------------------------------
65 be attached on a command prompt as follows::
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/linux/drivers/bluetooth/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
105 tristate "HCI UART driver"
111 Bluetooth HCI UART driver.
114 UART based Bluetooth PCMCIA and CF devices like Xircom Credit Card
117 Say Y here to compile support for Bluetooth UART devices into the
126 bool "UART (H4) protocol support"
129 UART (H4) is serial protocol for communication between Bluetooth
131 with UART interface, including PCMCIA and CF cards.
133 Say Y here to compile support for HCI UART (H4) protocol.
136 tristate "UART Nokia H4+ protocol support"
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/linux/drivers/gpio/
H A Dgpio-exar.c1 // SPDX-License-Identifier: GPL-2.0-only
25 * The Device Configuration and UART Configuration Registers
26 * for each UART channel take 1KB of memory address space.
50 unsigned int pin = exar_gpio->first_pin + (offset % 16); in exar_offset_to_sel_addr()
54 return addr + (cascaded ? exar_gpio->cascaded_offset : 0); in exar_offset_to_sel_addr()
60 unsigned int pin = exar_gpio->first_pin + (offset % 16); in exar_offset_to_lvl_addr()
64 return addr + (cascaded ? exar_gpio->cascaded_offset : 0); in exar_offset_to_lvl_addr()
70 unsigned int pin = exar_gpio->first_pin + (offset % 16); in exar_offset_to_bit()
81 if (regmap_test_bits(exar_gpio->regmap, addr, BIT(bit))) in exar_get_direction()
93 return !!(regmap_test_bits(exar_gpio->regmap, addr, BIT(bit))); in exar_get_value()
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/linux/Documentation/devicetree/bindings/ptp/
H A Dtimestamper.txt3 This binding supports non-PHY devices that snoop the MII bus and
9 Non-PHY MII time stamping drivers typically talk to the control
10 interface over another bus like I2C, SPI, UART, or via a memory mapped
20 compatible = "ines,ptp-ctrl";
26 ethernet-phy@1 {
34 ethernet-phy@2 {
40 In this example, time stamps from the MII bus attached to phy@1 will
/linux/Documentation/trace/coresight/
H A Dcoresight-ect.rst1 .. SPDX-License-Identifier: GPL-2.0
11 --------------------
21 0 C 0----------->: : +======>(other CTI channel IO)
22 0 P 0<-----------: : v
24 0000000 : CTI :<=========>*CTM*<====>: CTI :---+
25 ####### in_trigs : : (id 0-3) ***** ::::::: v
26 # ETM #----------->: : ^ #######
27 # #<-----------: : +---# ETR #
31 channels. When an input trigger becomes active, the attached channel will
32 become active. Any output trigger attached to that channel will also
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/linux/drivers/bus/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0
37 Driver for the Broadcom Set Top Box System-on-a-chip internal bus
42 bool "Baikal-T1 APB-bus driver"
46 Baikal-T1 AXI-APB bridge is used to access the SoC subsystem CSRs.
53 errors counter. The counter and the APB-bus operations timeout can be
57 bool "Baikal-T1 AXI-bus driver"
61 AXI3-bus is the main communication bus connecting all high-speed
62 peripheral IP-cores with RAM controller and with MIPS P5600 cores on
63 Baikal-T1 SoC. Traffic arbitration is done by means of DW AMBA 3 AXI
87 Driver to enable I/O access to devices attached to the Low Pin
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/linux/net/nfc/nci/
H A Duart.c1 // SPDX-License-Identifier: GPL-2.0-or-later
7 * Copyright (C) 2000-2001 Qualcomm Incorporated
8 * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com>
9 * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org>
41 struct sk_buff *skb = nu->tx_skb; in nci_uart_dequeue()
44 skb = skb_dequeue(&nu->tx_q); in nci_uart_dequeue()
46 nu->tx_skb = NULL; in nci_uart_dequeue()
53 if (nu->tx_skb) in nci_uart_queue_empty()
56 return skb_queue_empty(&nu->tx_q); in nci_uart_queue_empty()
61 if (test_and_set_bit(NCI_UART_SENDING, &nu->tx_state)) { in nci_uart_tx_wakeup()
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/linux/Documentation/devicetree/bindings/bus/
H A Dsocionext,uniphier-system-bus.yaml1 # SPDX-License-Identifier: GPL-2.0-only OR BSD-2-Clause
3 ---
4 $id: http://devicetree.org/schemas/bus/socionext,uniphier-system-bus.yaml#
5 $schema: http://devicetree.org/meta-schemas/core.yaml#
10 The UniPhier System Bus is an external bus that connects on-board devices to
11 the UniPhier SoC. It is a simple (semi-)parallel bus with address, data, and
16 within each bank to the CPU-viewed address. The needed setup includes the
21 - Masahiro Yamada <yamada.masahiro@socionext.com>
25 const: socionext,uniphier-system-bus
30 "#address-cells":
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/linux/drivers/tty/serial/
H A Dxilinx_uartps.c1 // SPDX-License-Identifier: GPL-2.0+
3 * Cadence UART driver (found in Xilinx Zynq)
5 * Copyright (c) 2011 - 2014 Xilinx, Inc.
7 * This driver has originally been pushed by Xilinx using a Zynq-branding. This
41 MODULE_PARM_DESC(rx_trigger_level, "Rx trigger level, 1-63 bytes");
46 MODULE_PARM_DESC(rx_timeout, "Rx timeout, 1-255");
48 /* Register offsets for the UART. */
89 #define CDNS_UART_MR_CLKSEL 0x00000001 /* Pre-scalar selection */
189 * struct cdns_uart - device data
190 * @port: Pointer to the UART port
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H A Dserial_txx9.c1 // SPDX-License-Identifier: GPL-2.0
10 * Copyright (C) 2000-2002 Toshiba Corporation
161 switch (up->iotype) { in sio_in()
163 return __raw_readl(up->membase + offset); in sio_in()
165 return inl(up->iobase + offset); in sio_in()
172 switch (up->iotype) { in sio_out()
174 __raw_writel(value, up->membase + offset); in sio_out()
177 outl(value, up->iobase + offset); in sio_out()
221 up->read_status_mask &= ~TXX9_SIDISR_RDIS; in serial_txx9_stop_rx()
232 while ((sio_in(up, TXX9_SIFCR) & TXX9_SIFCR_SWRST) && --tmout) in serial_txx9_initialize()
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/linux/drivers/platform/chrome/
H A DKconfig1 # SPDX-License-Identifier: GPL-2.0-only
26 If you have an ACPI-compatible Chromebook, say Y or M here.
47 The range of memory used is 0xf00000-0x1000000, traditionally
73 devices that have multiple drop-in options for one component.
94 EC through an I2C bus. This uses a simple byte-level protocol with
103 through rpmsg. This uses a simple byte-level protocol with a
104 checksum. Also since there's no addition EC-to-host interrupt, this
117 ISH Transport protocol (ISH-TP). This uses a simple byte-level
129 through a SPI bus, using a byte-level protocol. Since the EC's
131 'pre-amble' bytes before the response actually starts.
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