| fdt_pinctrl.4 (19758005ab2bcfef7b3a09dea40169b3857392ed) | fdt_pinctrl.4 (3d265fce43746c293ae826e9603adbfe09f93cf6) |
|---|---|
| 1.\" Copyright (c) 2018 Oleksandr Tymoshenko 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 19 unchanged lines hidden (view full) --- 28.Dt "FDT_PINCTRL" 4 29.Os 30.Sh NAME 31.Nm fdt_pinctrl 32.Nd FDT I/O pin multiplexing support 33.Sh SYNOPSIS 34.Cd "device fdt_pinctrl" 35.Sh DESCRIPTION | 1.\" Copyright (c) 2018 Oleksandr Tymoshenko 2.\" All rights reserved. 3.\" 4.\" Redistribution and use in source and binary forms, with or without 5.\" modification, are permitted provided that the following conditions 6.\" are met: 7.\" 1. Redistributions of source code must retain the above copyright 8.\" notice, this list of conditions and the following disclaimer. --- 19 unchanged lines hidden (view full) --- 28.Dt "FDT_PINCTRL" 4 29.Os 30.Sh NAME 31.Nm fdt_pinctrl 32.Nd FDT I/O pin multiplexing support 33.Sh SYNOPSIS 34.Cd "device fdt_pinctrl" 35.Sh DESCRIPTION |
| 36.Pp | |
| 37Pin multiplexing is a technology used to re-purpose a single 38physical connection (depending on chip packaging it may be | 36Pin multiplexing is a technology used to re-purpose a single 37physical connection (depending on chip packaging it may be |
| 39pin, ball, or pad) by routing its signal to any one of several | 38pin, ball, or pad) by routing its signal to any one of several |
| 40different SoC internal devices. 41For example, based on the actual device design, a single SoC chip 42pin might perform any of these roles: SPI clock, I2C 43data, GPIO pin, or PWM signal. 44Function selection is performed by the pinmux controller, a SoC 45hardware block which is usually controlled by a set of registers. 46Pinmux controller capabilities and register format depend 47on the actual hardware implementation. --- 80 unchanged lines hidden --- | 39different SoC internal devices. 40For example, based on the actual device design, a single SoC chip 41pin might perform any of these roles: SPI clock, I2C 42data, GPIO pin, or PWM signal. 43Function selection is performed by the pinmux controller, a SoC 44hardware block which is usually controlled by a set of registers. 45Pinmux controller capabilities and register format depend 46on the actual hardware implementation. --- 80 unchanged lines hidden --- |