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freebsd-dev/share/man/man4/gpioiic.4

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Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
.\" Copyright (c) 2013, Luiz Otavio O Souza <loos@FreeBSD.org>
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\" notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\" notice, this list of conditions and the following disclaimer in the
.\" documentation and/or other materials provided with the distribution.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
.\" SUCH DAMAGE.
.\"
.\" $FreeBSD$
.\"
Rewrite gpioiic(4) to use the gpio_pin_* API, and to conform to the modern FDT bindings document for gpio-i2c devices. Using the gpio_pin_* functions to acquire/release/manipulate gpio pins removes the constraint that both gpio pins must belong to the same gpio controller/bank, and that the gpioiic instance must be a child of gpiobus. Removing those constraints allows the driver to be fully compatible with the modern dts bindings for a gpio bitbanged i2c bus. For hinted attachment, the two gpio pins still must be on the same gpiobus, and the device instance must be a child of that bus. This preserves compatibility for existing installations that have use gpioiic(4) with hints.
2019-12-01 23:05:20 +00:00
.Dd December 1, 2019
Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
.Dt GPIOIIC 4
.Os
.Sh NAME
.Nm gpioiic
.Nd GPIO I2C bit-banging device driver
.Sh SYNOPSIS
Spelling, grammar and mdoc cleanup.
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To compile this driver into the kernel,
place the following lines in your
kernel configuration file:
.Bd -ragged -offset indent
Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
.Cd "device gpio"
.Cd "device gpioiic"
.Cd "device iicbb"
.Cd "device iicbus"
Spelling, grammar and mdoc cleanup.
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.Ed
Rewrite gpioiic(4) to use the gpio_pin_* API, and to conform to the modern FDT bindings document for gpio-i2c devices. Using the gpio_pin_* functions to acquire/release/manipulate gpio pins removes the constraint that both gpio pins must belong to the same gpio controller/bank, and that the gpioiic instance must be a child of gpiobus. Removing those constraints allows the driver to be fully compatible with the modern dts bindings for a gpio bitbanged i2c bus. For hinted attachment, the two gpio pins still must be on the same gpiobus, and the device instance must be a child of that bus. This preserves compatibility for existing installations that have use gpioiic(4) with hints.
2019-12-01 23:05:20 +00:00
.Pp
Alternatively, to load the driver as a
module at boot time, place the following line in
.Xr loader.conf 5 :
.Bd -literal -offset indent
gpioiic_load="YES"
.Ed
Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
.Sh DESCRIPTION
The
Spelling, grammar and mdoc cleanup.
2014-02-20 16:35:48 +00:00
.Nm
Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
driver provides an IIC bit-banging interface using two GPIO pins for the
Rewrite gpioiic(4) to use the gpio_pin_* API, and to conform to the modern FDT bindings document for gpio-i2c devices. Using the gpio_pin_* functions to acquire/release/manipulate gpio pins removes the constraint that both gpio pins must belong to the same gpio controller/bank, and that the gpioiic instance must be a child of gpiobus. Removing those constraints allows the driver to be fully compatible with the modern dts bindings for a gpio bitbanged i2c bus. For hinted attachment, the two gpio pins still must be on the same gpiobus, and the device instance must be a child of that bus. This preserves compatibility for existing installations that have use gpioiic(4) with hints.
2019-12-01 23:05:20 +00:00
SCL and SDA lines on the bus.
.Pp
Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
.Nm
Rewrite gpioiic(4) to use the gpio_pin_* API, and to conform to the modern FDT bindings document for gpio-i2c devices. Using the gpio_pin_* functions to acquire/release/manipulate gpio pins removes the constraint that both gpio pins must belong to the same gpio controller/bank, and that the gpioiic instance must be a child of gpiobus. Removing those constraints allows the driver to be fully compatible with the modern dts bindings for a gpio bitbanged i2c bus. For hinted attachment, the two gpio pins still must be on the same gpiobus, and the device instance must be a child of that bus. This preserves compatibility for existing installations that have use gpioiic(4) with hints.
2019-12-01 23:05:20 +00:00
simulates an open collector kind of output when managing the pins on the
bus, even on systems which don't directly support configuring gpio pins
in that mode.
The pins are never driven to the logical value of '1'.
They are driven to '0' or switched to input mode (Hi-Z/tri-state), and
an external pullup resistor pulls the line to the 1 state unless some
other device on the bus is driving it to 0.
.Sh HINTS CONFIGURATION
Spelling, grammar and mdoc cleanup.
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On a
.Xr device.hints 5
Rewrite gpioiic(4) to use the gpio_pin_* API, and to conform to the modern FDT bindings document for gpio-i2c devices. Using the gpio_pin_* functions to acquire/release/manipulate gpio pins removes the constraint that both gpio pins must belong to the same gpio controller/bank, and that the gpioiic instance must be a child of gpiobus. Removing those constraints allows the driver to be fully compatible with the modern dts bindings for a gpio bitbanged i2c bus. For hinted attachment, the two gpio pins still must be on the same gpiobus, and the device instance must be a child of that bus. This preserves compatibility for existing installations that have use gpioiic(4) with hints.
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based system, such as MIPS, these values are configurable for
Spelling, grammar and mdoc cleanup.
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.Nm :
Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
.Bl -tag -width ".Va hint.gpioiic.%d.atXXX"
.It Va hint.gpioiic.%d.at
Spelling, grammar and mdoc cleanup.
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The
.Nm gpiobus
you are attaching to.
Rewrite gpioiic(4) to use the gpio_pin_* API, and to conform to the modern FDT bindings document for gpio-i2c devices. Using the gpio_pin_* functions to acquire/release/manipulate gpio pins removes the constraint that both gpio pins must belong to the same gpio controller/bank, and that the gpioiic instance must be a child of gpiobus. Removing those constraints allows the driver to be fully compatible with the modern dts bindings for a gpio bitbanged i2c bus. For hinted attachment, the two gpio pins still must be on the same gpiobus, and the device instance must be a child of that bus. This preserves compatibility for existing installations that have use gpioiic(4) with hints.
2019-12-01 23:05:20 +00:00
Normally just gpiobus0 on systems with a single bank of gpio pins.
Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
.It Va hint.gpioiic.%d.pins
This is a bitmask of the pins on the
Spelling, grammar and mdoc cleanup.
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.Nm gpiobus
Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
that are to be used for SCLOCK and SDATA from the GPIO IIC
bit-banging bus.
To configure pin 0 and 7, use the bitmask of
Add OFW support to the in tree gpio compatible devices: gpioiic(4) and gpioled(4). Tested on RPi and BBB (using the hardware I2C controller and gpioiic(4) for the I2C tests). It was also verified for regressions on RSPRO (MIPS/ar71xx) used as reference for a non OFW-based system. Update the gpioled(4) and gpioiic(4) man pages with some details and examples about the FDT/OFW support. Some compatibility details pointed out by imp@ will follow in subsequent commits. Approved by: adrian (mentor, implicit)
2014-02-13 17:58:52 +00:00
0b10000001 and convert it to a hexadecimal value of 0x0081.
Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
Please note that this mask should only ever have two bits set
Spelling, grammar and mdoc cleanup.
2014-02-20 16:35:48 +00:00
(any other bits - i.e., pins - will be ignored).
Rewrite gpioiic(4) to use the gpio_pin_* API, and to conform to the modern FDT bindings document for gpio-i2c devices. Using the gpio_pin_* functions to acquire/release/manipulate gpio pins removes the constraint that both gpio pins must belong to the same gpio controller/bank, and that the gpioiic instance must be a child of gpiobus. Removing those constraints allows the driver to be fully compatible with the modern dts bindings for a gpio bitbanged i2c bus. For hinted attachment, the two gpio pins still must be on the same gpiobus, and the device instance must be a child of that bus. This preserves compatibility for existing installations that have use gpioiic(4) with hints.
2019-12-01 23:05:20 +00:00
Because
.Nm
must be a child of the gpiobus, both gpio pins must be part of that bus.
Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
.It Va hint.gpioiic.%d.scl
Indicates which bit in the
.Va hint.gpioiic.%d.pins
should be used as the SCLOCK
source.
Add OFW support to the in tree gpio compatible devices: gpioiic(4) and gpioled(4). Tested on RPi and BBB (using the hardware I2C controller and gpioiic(4) for the I2C tests). It was also verified for regressions on RSPRO (MIPS/ar71xx) used as reference for a non OFW-based system. Update the gpioled(4) and gpioiic(4) man pages with some details and examples about the FDT/OFW support. Some compatibility details pointed out by imp@ will follow in subsequent commits. Approved by: adrian (mentor, implicit)
2014-02-13 17:58:52 +00:00
Optional, defaults to 0.
Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
.It Va hint.gpioiic.%d.sda
Indicates which bit in the
.Va hint.gpioiic.%d.pins
should be used as the SDATA
source.
Add OFW support to the in tree gpio compatible devices: gpioiic(4) and gpioled(4). Tested on RPi and BBB (using the hardware I2C controller and gpioiic(4) for the I2C tests). It was also verified for regressions on RSPRO (MIPS/ar71xx) used as reference for a non OFW-based system. Update the gpioled(4) and gpioiic(4) man pages with some details and examples about the FDT/OFW support. Some compatibility details pointed out by imp@ will follow in subsequent commits. Approved by: adrian (mentor, implicit)
2014-02-13 17:58:52 +00:00
Optional, defaults to 1.
.El
Rewrite gpioiic(4) to use the gpio_pin_* API, and to conform to the modern FDT bindings document for gpio-i2c devices. Using the gpio_pin_* functions to acquire/release/manipulate gpio pins removes the constraint that both gpio pins must belong to the same gpio controller/bank, and that the gpioiic instance must be a child of gpiobus. Removing those constraints allows the driver to be fully compatible with the modern dts bindings for a gpio bitbanged i2c bus. For hinted attachment, the two gpio pins still must be on the same gpiobus, and the device instance must be a child of that bus. This preserves compatibility for existing installations that have use gpioiic(4) with hints.
2019-12-01 23:05:20 +00:00
.Sh FDT CONFIGURATION
On an
Add OFW support to the in tree gpio compatible devices: gpioiic(4) and gpioled(4). Tested on RPi and BBB (using the hardware I2C controller and gpioiic(4) for the I2C tests). It was also verified for regressions on RSPRO (MIPS/ar71xx) used as reference for a non OFW-based system. Update the gpioled(4) and gpioiic(4) man pages with some details and examples about the FDT/OFW support. Some compatibility details pointed out by imp@ will follow in subsequent commits. Approved by: adrian (mentor, implicit)
2014-02-13 17:58:52 +00:00
.Xr FDT 4
Rewrite gpioiic(4) to use the gpio_pin_* API, and to conform to the modern FDT bindings document for gpio-i2c devices. Using the gpio_pin_* functions to acquire/release/manipulate gpio pins removes the constraint that both gpio pins must belong to the same gpio controller/bank, and that the gpioiic instance must be a child of gpiobus. Removing those constraints allows the driver to be fully compatible with the modern dts bindings for a gpio bitbanged i2c bus. For hinted attachment, the two gpio pins still must be on the same gpiobus, and the device instance must be a child of that bus. This preserves compatibility for existing installations that have use gpioiic(4) with hints.
2019-12-01 23:05:20 +00:00
based system, such as ARM, the DTS node for
Add OFW support to the in tree gpio compatible devices: gpioiic(4) and gpioled(4). Tested on RPi and BBB (using the hardware I2C controller and gpioiic(4) for the I2C tests). It was also verified for regressions on RSPRO (MIPS/ar71xx) used as reference for a non OFW-based system. Update the gpioled(4) and gpioiic(4) man pages with some details and examples about the FDT/OFW support. Some compatibility details pointed out by imp@ will follow in subsequent commits. Approved by: adrian (mentor, implicit)
2014-02-13 17:58:52 +00:00
.Nm gpioiic
Rewrite gpioiic(4) to use the gpio_pin_* API, and to conform to the modern FDT bindings document for gpio-i2c devices. Using the gpio_pin_* functions to acquire/release/manipulate gpio pins removes the constraint that both gpio pins must belong to the same gpio controller/bank, and that the gpioiic instance must be a child of gpiobus. Removing those constraints allows the driver to be fully compatible with the modern dts bindings for a gpio bitbanged i2c bus. For hinted attachment, the two gpio pins still must be on the same gpiobus, and the device instance must be a child of that bus. This preserves compatibility for existing installations that have use gpioiic(4) with hints.
2019-12-01 23:05:20 +00:00
conforms to the standard bindings document i2c/i2c-gpio.yaml.
The device node typically appears at the root of the device tree.
The following is an example of a
.Nm
node with one slave device
on the IIC bus:
Add OFW support to the in tree gpio compatible devices: gpioiic(4) and gpioled(4). Tested on RPi and BBB (using the hardware I2C controller and gpioiic(4) for the I2C tests). It was also verified for regressions on RSPRO (MIPS/ar71xx) used as reference for a non OFW-based system. Update the gpioled(4) and gpioiic(4) man pages with some details and examples about the FDT/OFW support. Some compatibility details pointed out by imp@ will follow in subsequent commits. Approved by: adrian (mentor, implicit)
2014-02-13 17:58:52 +00:00
.Bd -literal
Rewrite gpioiic(4) to use the gpio_pin_* API, and to conform to the modern FDT bindings document for gpio-i2c devices. Using the gpio_pin_* functions to acquire/release/manipulate gpio pins removes the constraint that both gpio pins must belong to the same gpio controller/bank, and that the gpioiic instance must be a child of gpiobus. Removing those constraints allows the driver to be fully compatible with the modern dts bindings for a gpio bitbanged i2c bus. For hinted attachment, the two gpio pins still must be on the same gpiobus, and the device instance must be a child of that bus. This preserves compatibility for existing installations that have use gpioiic(4) with hints.
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/ {
Add OFW support to the in tree gpio compatible devices: gpioiic(4) and gpioled(4). Tested on RPi and BBB (using the hardware I2C controller and gpioiic(4) for the I2C tests). It was also verified for regressions on RSPRO (MIPS/ar71xx) used as reference for a non OFW-based system. Update the gpioled(4) and gpioiic(4) man pages with some details and examples about the FDT/OFW support. Some compatibility details pointed out by imp@ will follow in subsequent commits. Approved by: adrian (mentor, implicit)
2014-02-13 17:58:52 +00:00
gpioiic0 {
Rewrite gpioiic(4) to use the gpio_pin_* API, and to conform to the modern FDT bindings document for gpio-i2c devices. Using the gpio_pin_* functions to acquire/release/manipulate gpio pins removes the constraint that both gpio pins must belong to the same gpio controller/bank, and that the gpioiic instance must be a child of gpiobus. Removing those constraints allows the driver to be fully compatible with the modern dts bindings for a gpio bitbanged i2c bus. For hinted attachment, the two gpio pins still must be on the same gpiobus, and the device instance must be a child of that bus. This preserves compatibility for existing installations that have use gpioiic(4) with hints.
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compatible = "i2c-gpio";
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_gpioiic0>;
scl-gpios = <&gpio1 5 GPIO_ACTIVE_HIGH>;
sda-gpios = <&gpio7 11 GPIO_ACTIVE_HIGH>;
status = "okay";
Add OFW support to the in tree gpio compatible devices: gpioiic(4) and gpioled(4). Tested on RPi and BBB (using the hardware I2C controller and gpioiic(4) for the I2C tests). It was also verified for regressions on RSPRO (MIPS/ar71xx) used as reference for a non OFW-based system. Update the gpioled(4) and gpioiic(4) man pages with some details and examples about the FDT/OFW support. Some compatibility details pointed out by imp@ will follow in subsequent commits. Approved by: adrian (mentor, implicit)
2014-02-13 17:58:52 +00:00
Rewrite gpioiic(4) to use the gpio_pin_* API, and to conform to the modern FDT bindings document for gpio-i2c devices. Using the gpio_pin_* functions to acquire/release/manipulate gpio pins removes the constraint that both gpio pins must belong to the same gpio controller/bank, and that the gpioiic instance must be a child of gpiobus. Removing those constraints allows the driver to be fully compatible with the modern dts bindings for a gpio bitbanged i2c bus. For hinted attachment, the two gpio pins still must be on the same gpiobus, and the device instance must be a child of that bus. This preserves compatibility for existing installations that have use gpioiic(4) with hints.
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/* One slave device on the i2c bus. */
rtc@51 {
compatible="nxp,pcf2127";
reg = <0x51>;
status = "okay";
Add OFW support to the in tree gpio compatible devices: gpioiic(4) and gpioled(4). Tested on RPi and BBB (using the hardware I2C controller and gpioiic(4) for the I2C tests). It was also verified for regressions on RSPRO (MIPS/ar71xx) used as reference for a non OFW-based system. Update the gpioled(4) and gpioiic(4) man pages with some details and examples about the FDT/OFW support. Some compatibility details pointed out by imp@ will follow in subsequent commits. Approved by: adrian (mentor, implicit)
2014-02-13 17:58:52 +00:00
};
};
};
.Ed
.Pp
Where:
.Bl -tag -width ".Va compatible"
.It Va compatible
Rewrite gpioiic(4) to use the gpio_pin_* API, and to conform to the modern FDT bindings document for gpio-i2c devices. Using the gpio_pin_* functions to acquire/release/manipulate gpio pins removes the constraint that both gpio pins must belong to the same gpio controller/bank, and that the gpioiic instance must be a child of gpiobus. Removing those constraints allows the driver to be fully compatible with the modern dts bindings for a gpio bitbanged i2c bus. For hinted attachment, the two gpio pins still must be on the same gpiobus, and the device instance must be a child of that bus. This preserves compatibility for existing installations that have use gpioiic(4) with hints.
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Should be set to "i2c-gpio".
The deprecated string "gpioiic" is also accepted for backwards compatibility.
.It Va scl-gpios Va sda-gpios
These properties indicate which GPIO pins should be used for clock
and data on the GPIO IIC bit-banging bus.
There is no requirement that the two pins belong to the same gpio controller.
.It Va pinctrl-names pinctrl-0
These properties may be required to configure the chosen pins as gpio
pins, unless the pins default to that state on your system.
Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
.El
.Sh SEE ALSO
Add OFW support to the in tree gpio compatible devices: gpioiic(4) and gpioled(4). Tested on RPi and BBB (using the hardware I2C controller and gpioiic(4) for the I2C tests). It was also verified for regressions on RSPRO (MIPS/ar71xx) used as reference for a non OFW-based system. Update the gpioled(4) and gpioiic(4) man pages with some details and examples about the FDT/OFW support. Some compatibility details pointed out by imp@ will follow in subsequent commits. Approved by: adrian (mentor, implicit)
2014-02-13 17:58:52 +00:00
.Xr fdt 4 ,
Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
.Xr gpio 4 ,
.Xr iic 4 ,
.Xr iicbb 4 ,
.Xr iicbus 4
.Sh HISTORY
The
.Nm
manual page first appeared in
gpioiic.4 and gpioled.4 will first appear in 10.1-RELEASE.
2014-05-14 21:54:14 +00:00
.Fx 10.1 .
Adds gpioiic.4 and gpioled.4 man pages. Moves some of the information that was previously available on gpio.4 to their respectives pages. Add the cross references on gpioctl.8. Approved by: adrian (mentor)
2013-11-12 12:44:59 +00:00
.Sh AUTHORS
This
manual page was written by
.An Luiz Otavio O Souza .
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