| /kernel/linux/linux-5.10/Documentation/devicetree/bindings/i2c/ |
| D | i2c-mux-gpmux.txt | 1 General Purpose I2C Bus Mux
3 This binding describes an I2C bus multiplexer that uses a mux controller
4 from the mux subsystem to route the I2C signals.
6 .-----. .-----.
8 .------------. '-----' '-----'
10 | | .--------+--------'
11 | .------. | .------+ child bus A, on MUX value set to 0
12 | | I2C |-|--| Mux |
13 | '------' | '--+---+ child bus B, on MUX value set to 1
14 | .------. | | '----------+--------+--------.
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| D | i2c-mux-pca954x.txt | 1 * NXP PCA954x I2C bus switch
3 The driver supports NXP PCA954x and PCA984x I2C mux/switch devices.
7 - compatible: Must contain one of the following.
18 - reg: The I2C address of the device.
22 - Standard I2C mux properties. See i2c-mux.txt in this directory.
23 - I2C child bus nodes. See i2c-mux.txt in this directory.
27 - reset-gpios: Reference to the GPIO connected to the reset input.
28 - idle-state: if present, overrides i2c-mux-idle-disconnect,
29 Please refer to Documentation/devicetree/bindings/mux/mux-controller.txt
30 - i2c-mux-idle-disconnect: Boolean; if defined, forces mux to disconnect all
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| D | i2c-mux-reg.txt | 1 Register-based I2C Bus Mux
3 This binding describes an I2C bus multiplexer that uses a single register
4 to route the I2C signals.
7 - compatible: i2c-mux-reg
8 - i2c-parent: The phandle of the I2C bus that this multiplexer's master-side
10 * Standard I2C mux properties. See i2c-mux.txt in this directory.
11 * I2C child bus nodes. See i2c-mux.txt in this directory.
14 - reg: this pair of <offset size> specifies the register to control the mux.
15 The <offset size> depends on its parent node. It can be any memory-mapped
18 - little-endian: The existence indicates the register is in little endian.
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| D | i2c-mux.txt | 1 Common i2c bus multiplexer/switch properties.
3 An i2c bus multiplexer/switch will have several child busses that are
4 numbered uniquely in a device dependent manner. The nodes for an i2c bus
8 - #address-cells = <1>;
9 This property is required if the i2c-mux child node does not exist.
11 - #size-cells = <0>;
12 This property is required if the i2c-mux child node does not exist.
14 - i2c-mux
15 For i2c multiplexers/switches that have child nodes that are a mixture
16 of both i2c child busses and other child nodes, the 'i2c-mux' subnode
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| D | i2c-mux-gpio.txt | 1 GPIO-based I2C Bus Mux
3 This binding describes an I2C bus multiplexer that uses GPIOs to
4 route the I2C signals.
6 +-----+ +-----+
8 +------------+ +-----+ +-----+
10 | | /--------+--------+
11 | +------+ | +------+ child bus A, on GPIO value set to 0
12 | | I2C |-|--| Mux |
13 | +------+ | +--+---+ child bus B, on GPIO value set to 1
14 | | | \----------+--------+--------+
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| D | i2c-mux-ltc4306.txt | 1 * Linear Technology / Analog Devices I2C bus switch
5 - compatible: Must contain one of the following.
7 - reg: The I2C address of the device.
11 - Standard I2C mux properties. See i2c-mux.txt in this directory.
12 - I2C child bus nodes. See i2c-mux.txt in this directory.
16 - enable-gpios: Reference to the GPIO connected to the enable input.
17 - i2c-mux-idle-disconnect: Boolean; if defined, forces mux to disconnect all
19 multiplexers on the bus and the devices behind them use same I2C addresses.
20 - gpio-controller: Marks the device node as a GPIO Controller.
21 - #gpio-cells: Should be two. The first cell is the pin number and
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| D | i2c-mux-pinctrl.txt | 1 Pinctrl-based I2C Bus Mux
3 This binding describes an I2C bus multiplexer that uses pin multiplexing to
4 route the I2C signals, and represents the pin multiplexing configuration
7 +-----+ +-----+
9 +------------------------+ +-----+ +-----+
11 | /----|------+--------+
12 | +---+ +------+ | child bus A, on first set of pins
13 | |I2C|---|Pinmux| |
14 | +---+ +------+ | child bus B, on second set of pins
15 | \----|------+--------+--------+
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| /kernel/linux/linux-5.10/drivers/i2c/muxes/ |
| D | Kconfig | 1 # SPDX-License-Identifier: GPL-2.0-only
3 # Multiplexer I2C chip drivers configuration
6 menu "Multiplexer I2C Chip support"
10 tristate "GPIO-based I2C arbitration"
15 I2C multimaster arbitration scheme using GPIOs and a challenge &
20 will be called i2c-arb-gpio-challenge.
23 tristate "GPIO-based I2C multiplexer"
27 GPIO based I2C multiplexer. This driver provides access to
28 I2C busses connected through a MUX, which is controlled
32 will be called i2c-mux-gpio.
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| D | i2c-mux-gpio.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * I2C multiplexer using GPIO API
8 #include <linux/i2c.h>
9 #include <linux/i2c-mux.h>
10 #include <linux/platform_data/i2c-mux-gpio.h>
25 static void i2c_mux_gpio_set(const struct gpiomux *mux, unsigned val) in i2c_mux_gpio_set() argument
31 gpiod_set_array_value_cansleep(mux->ngpios, mux->gpios, NULL, values); in i2c_mux_gpio_set()
36 struct gpiomux *mux = i2c_mux_priv(muxc); in i2c_mux_gpio_select() local
38 i2c_mux_gpio_set(mux, chan); in i2c_mux_gpio_select()
45 struct gpiomux *mux = i2c_mux_priv(muxc); in i2c_mux_gpio_deselect() local
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| D | i2c-mux-gpmux.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * General Purpose I2C multiplexer
10 #include <linux/i2c.h>
11 #include <linux/i2c-mux.h>
13 #include <linux/mux/consumer.h>
17 struct mux { struct
25 struct mux *mux = i2c_mux_priv(muxc); in i2c_mux_select() local
28 ret = mux_control_select(mux->control, chan); in i2c_mux_select()
29 mux->do_not_deselect = ret < 0; in i2c_mux_select()
36 struct mux *mux = i2c_mux_priv(muxc); in i2c_mux_deselect() local
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| D | Makefile | 1 # SPDX-License-Identifier: GPL-2.0
3 # Makefile for multiplexer I2C chip drivers.
5 obj-$(CONFIG_I2C_ARB_GPIO_CHALLENGE) += i2c-arb-gpio-challenge.o
7 obj-$(CONFIG_I2C_DEMUX_PINCTRL) += i2c-demux-pinctrl.o
9 obj-$(CONFIG_I2C_MUX_GPIO) += i2c-mux-gpio.o
10 obj-$(CONFIG_I2C_MUX_GPMUX) += i2c-mux-gpmux.o
11 obj-$(CONFIG_I2C_MUX_LTC4306) += i2c-mux-ltc4306.o
12 obj-$(CONFIG_I2C_MUX_MLXCPLD) += i2c-mux-mlxcpld.o
13 obj-$(CONFIG_I2C_MUX_PCA9541) += i2c-mux-pca9541.o
14 obj-$(CONFIG_I2C_MUX_PCA954x) += i2c-mux-pca954x.o
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| D | i2c-mux-reg.c | 1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * I2C multiplexer using a single register
9 #include <linux/i2c.h>
10 #include <linux/i2c-mux.h>
15 #include <linux/platform_data/i2c-mux-reg.h>
23 static int i2c_mux_reg_set(const struct regmux *mux, unsigned int chan_id) in i2c_mux_reg_set() argument
25 if (!mux->data.reg) in i2c_mux_reg_set()
26 return -EINVAL; in i2c_mux_reg_set()
34 switch (mux->data.reg_size) { in i2c_mux_reg_set()
36 if (mux->data.little_endian) in i2c_mux_reg_set()
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| D | i2c-mux-pinctrl.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * I2C multiplexer using pinctrl API
8 #include <linux/i2c.h>
9 #include <linux/i2c-mux.h>
24 struct i2c_mux_pinctrl *mux = i2c_mux_priv(muxc); in i2c_mux_pinctrl_select() local
26 return pinctrl_select_state(mux->pinctrl, mux->states[chan]); in i2c_mux_pinctrl_select()
31 return i2c_mux_pinctrl_select(muxc, muxc->num_adapters); in i2c_mux_pinctrl_deselect()
41 list_for_each_entry(setting, &state->settings, node) { in i2c_mux_pinctrl_root_adapter()
42 pin_root = i2c_root_adapter(setting->pctldev->dev); in i2c_mux_pinctrl_root_adapter()
56 struct device_node *np = dev->of_node; in i2c_mux_pinctrl_parent_adapter()
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| D | i2c-mux-mlxcpld.c | 2 * drivers/i2c/muxes/i2c-mux-mlxcpld.c
36 #include <linux/i2c.h>
37 #include <linux/i2c-mux.h>
47 /* mlxcpld_mux - mux control structure:
48 * @last_chan - last register value
49 * @client - I2C device client
56 /* MUX logic description.
57 * Driver can support different mux control logic, according to CPLD
62 * i2c-mlxcpld Digital Analog
64 * *--------* * -> mux1 (virt bus2) -> mux -> |
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| /kernel/linux/linux-5.10/Documentation/i2c/ |
| D | i2c-topology.rst | 2 I2C muxes and complex topologies
5 There are a couple of reasons for building more complex I2C topologies
6 than a straight-forward I2C bus with one adapter and one or more devices.
8 1. A mux may be needed on the bus to prevent address collisions.
14 from the I2C bus, at least most of the time, and sits behind a gate
20 These constructs are represented as I2C adapter trees by Linux, where
23 I2C transfers, and all adapters with a parent are part of an "i2c-mux"
26 Depending of the particular mux driver, something happens when there is
27 an I2C transfer on one of its child adapters. The mux driver can
28 obviously operate a mux, but it can also do arbitration with an external
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| /kernel/linux/linux-5.10/drivers/mux/ |
| D | adg792a.c | 1 // SPDX-License-Identifier: GPL-2.0
3 * Multiplexer driver for Analog Devices ADG792A/G Triple 4:1 mux
11 #include <linux/i2c.h>
13 #include <linux/mux/driver.h>
18 #define ADG792A_DISABLE(mux) (0x50 | (mux)) argument
20 #define ADG792A_MUX(mux, state) (0xc0 | (((mux) + 1) << 2) | (state)) argument
23 static int adg792a_write_cmd(struct i2c_client *i2c, u8 cmd, int reset) in adg792a_write_cmd() argument
31 return i2c_smbus_write_byte_data(i2c, cmd, data); in adg792a_write_cmd()
34 static int adg792a_set(struct mux_control *mux, int state) in adg792a_set() argument
36 struct i2c_client *i2c = to_i2c_client(mux->chip->dev.parent); in adg792a_set() local
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| /kernel/linux/linux-5.10/Documentation/i2c/muxes/ |
| D | i2c-mux-gpio.rst | 2 Kernel driver i2c-mux-gpio
8 -----------
10 i2c-mux-gpio is an i2c mux driver providing access to I2C bus segments
11 from a master I2C bus and a hardware MUX controlled through GPIO pins.
15 ---------- ---------- Bus segment 1 - - - - -
16 | | SCL/SDA | |-------------- | |
17 | |------------| |
19 | Linux | GPIO 1..N | MUX |--------------- Devices
20 | |------------| | | |
22 | | | |---------------| |
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| /kernel/linux/linux-5.10/arch/arm/boot/dts/ |
| D | at91-natte.dtsi | 1 // SPDX-License-Identifier: GPL-2.0+
3 * at91-natte.dts - Device Tree include file for the Natte board
11 mux: mux-controller { label
12 compatible = "gpio-mux";
13 #mux-control-cells = <0>;
15 mux-gpios = <&ioexp 0 GPIO_ACTIVE_HIGH>,
20 batntc-mux {
21 compatible = "io-channel-mux";
22 io-channels = <&adc 5>;
23 io-channel-names = "parent";
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| D | aspeed-bmc-facebook-cmm.dts | 1 // SPDX-License-Identifier: GPL-2.0+
3 /dts-v1/;
5 #include "ast2500-facebook-netbmc-common.dtsi"
9 compatible = "facebook,cmm-bmc", "aspeed,ast2500";
22 * PCA9548 (1-0077) provides 8 channels for connecting to
35 * PCA9548 (2-0071) provides 8 channels for connecting to
48 * PCA9548 (8-0077) provides 8 channels and the first 4
61 * 2 PCA9548 (18-0070 & 18-0073), 16 channels connecting
82 * 2 PCA9548 (19-0070 & 19-0073), 16 channels connecting
103 * 2 PCA9548 (20-0070 & 20-0073), 16 channels connecting
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| /kernel/linux/linux-5.10/Documentation/devicetree/bindings/mux/ |
| D | gpio-mux.txt | 1 GPIO-based multiplexer controller bindings
7 - compatible : "gpio-mux"
8 - mux-gpios : list of gpios used to control the multiplexer, least
10 - #mux-control-cells : <0>
11 * Standard mux-controller bindings as decribed in mux-controller.txt
14 - idle-state : if present, the state the mux will have when idle. The
23 mux: mux-controller {
24 compatible = "gpio-mux";
25 #mux-control-cells = <0>;
27 mux-gpios = <&pioA 0 GPIO_ACTIVE_HIGH>,
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| D | mux-controller.txt | 4 A multiplexer (or mux) controller will have one, or several, consumer devices
5 that uses the mux controller. Thus, a mux controller can possibly control
7 multiplexer needed by each consumer, but a single mux controller can of course
10 A mux controller provides a number of states to its consumers, and the state
11 space is a simple zero-based enumeration. I.e. 0-1 for a 2-way multiplexer,
12 0-7 for an 8-way multiplexer, etc.
16 ---------
18 Mux controller consumers should specify a list of mux controllers that they
19 want to use with a property containing a 'mux-ctrl-list':
21 mux-ctrl-list ::= <single-mux-ctrl> [mux-ctrl-list]
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| /kernel/linux/linux-5.10/Documentation/devicetree/bindings/ |
| D | unittest.txt | 6 - compatible: must be "unittest"
15 2) OF unittest i2c adapter platform device
20 - compatible: must be unittest-i2c-bus
22 Children nodes contain unittest i2c devices.
25 unittest-i2c-bus {
26 compatible = "unittest-i2c-bus";
29 3) OF unittest i2c device
31 ** I2C unittest device
34 - compatible: must be unittest-i2c-dev
39 unittest-i2c-dev {
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| /kernel/linux/linux-5.10/drivers/i2c/ |
| D | i2c-mux.c | 2 * Multiplexed I2C bus driver.
4 * Copyright (c) 2008-2009 Rodolfo Giometti <giometti@linux.it>
5 * Copyright (c) 2008-2009 Eurotech S.p.A. <info@eurotech.it>
6 * Copyright (c) 2009-2010 NSN GmbH & Co KG <michael.lawnick.ext@nsn.com>
8 * Simplifies access to complex multiplexed I2C bus topologies, by presenting
9 * each multiplexed bus segment as an additional I2C adapter.
10 * Supports multi-level mux'ing (mux behind a mux).
13 * i2c-virt.c from Kumar Gala <galak@kernel.crashing.org>
14 * i2c-virtual.c from Ken Harrenstien, Copyright (c) 2004 Google, Inc.
15 * i2c-virtual.c from Brian Kuschak <bkuschak@yahoo.com>
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| /kernel/linux/linux-5.10/drivers/iio/gyro/ |
| D | mpu3050-i2c.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 #include <linux/i2c.h>
4 #include <linux/i2c-mux.h>
17 static int mpu3050_i2c_bypass_select(struct i2c_mux_core *mux, u32 chan_id) in mpu3050_i2c_bypass_select() argument
19 struct mpu3050 *mpu3050 = i2c_mux_priv(mux); in mpu3050_i2c_bypass_select()
22 pm_runtime_get_sync(mpu3050->dev); in mpu3050_i2c_bypass_select()
26 static int mpu3050_i2c_bypass_deselect(struct i2c_mux_core *mux, u32 chan_id) in mpu3050_i2c_bypass_deselect() argument
28 struct mpu3050 *mpu3050 = i2c_mux_priv(mux); in mpu3050_i2c_bypass_deselect()
30 pm_runtime_mark_last_busy(mpu3050->dev); in mpu3050_i2c_bypass_deselect()
31 pm_runtime_put_autosuspend(mpu3050->dev); in mpu3050_i2c_bypass_deselect()
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| /kernel/linux/linux-5.10/sound/soc/codecs/ |
| D | max98925.c | 1 // SPDX-License-Identifier: GPL-2.0-only
3 * max98925.c -- ALSA SoC Stereo MAX98925 driver
4 * Copyright 2013-15 Maxim Integrated Products
7 #include <linux/i2c.h>
92 SOC_DAPM_ENUM("Rc Filter MUX Mux", max98925_hpf_enum);
95 SOC_DAPM_ENUM("DAI IN MUX Mux", max98925_dai_enum);
105 regmap_update_bits(max98925->regmap, in max98925_dac_event()
113 regmap_update_bits(max98925->regmap, in max98925_dac_event()
125 SND_SOC_DAPM_MUX("DAI IN MUX", SND_SOC_NOPM, 0, 0,
127 SND_SOC_DAPM_MUX("Rc Filter MUX", SND_SOC_NOPM, 0, 0,
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