Date: Mon, 22 Apr 2019 02:37:46 +0000 (UTC) From: Ian Lepore <ian@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r346512 - in stable/11/share/man: man4 man9 Message-ID: <201904220237.x3M2bkPZ056840@repo.freebsd.org>
next in thread | raw e-mail | index | archive | help
Author: ian Date: Mon Apr 22 02:37:46 2019 New Revision: 346512 URL: https://svnweb.freebsd.org/changeset/base/346512 Log: MFC r330358, r330360 r330358: Minor changes to wording. r330360: Minor (mostly) wording changes. Modified: stable/11/share/man/man4/fdt_pinctrl.4 stable/11/share/man/man9/fdt_pinctrl.9 Directory Properties: stable/11/ (props changed) Modified: stable/11/share/man/man4/fdt_pinctrl.4 ============================================================================== --- stable/11/share/man/man4/fdt_pinctrl.4 Mon Apr 22 01:08:14 2019 (r346511) +++ stable/11/share/man/man4/fdt_pinctrl.4 Mon Apr 22 02:37:46 2019 (r346512) @@ -24,7 +24,7 @@ .\" .\" $FreeBSD$ .\" -.Dd March 2, 2018 +.Dd March 3, 2018 .Dt "FDT_PINCTRL" 4 .Os .Sh NAME @@ -36,13 +36,13 @@ .Pp Pin multiplexing is a technology used to re-purpose a single physical connection (depending on chip packaging it may be -pin, ball, or pad) to pull signal from one of SoC internal -controllers to peripheral devices. +pin, ball, or pad) by routing its signal to any one of several +different SoC internal devices. For example, based on the actual device design, a single SoC chip -pin can perform any of these roles: SPI clock, I2C +pin might perform any of these roles: SPI clock, I2C data, GPIO pin, or PWM signal. Function selection is performed by the pinmux controller, a SoC -hardware block, usually controlled a set of registers. +hardware block which is usually controlled by a set of registers. Pinmux controller capabilities and register format depend on the actual hardware implementation. .Pp @@ -104,11 +104,11 @@ backlight@7f000000 { } .Ed .Pp -The pinctrl driver should implement FDT_PINCTRL_CONFIGURE -method, register itself as pin configuration handler by +The pinctrl driver should implement the FDT_PINCTRL_CONFIGURE +method, register itself as a pin configuration handler by calling fdt_pinctrl_register function, and call .Xr fdt_pinctrl_configure_tree 9 -to configure pins for all enabled devices (device where +to configure pins for all enabled devices (devices where the "status" property is not set to "disabled"). .Sh SEE ALSO .Xr fdt_pinctrl 9 Modified: stable/11/share/man/man9/fdt_pinctrl.9 ============================================================================== --- stable/11/share/man/man9/fdt_pinctrl.9 Mon Apr 22 01:08:14 2019 (r346511) +++ stable/11/share/man/man9/fdt_pinctrl.9 Mon Apr 22 02:37:46 2019 (r346512) @@ -28,7 +28,7 @@ .\" .\" $FreeBSD$ .\" -.Dd March 2, 2018 +.Dd March 3, 2018 .Dt fdt_pinctrl 9 .Os .Sh NAME @@ -50,15 +50,17 @@ provides an API for manipulating I/O pin configuration pinmux controllers and pinmux clients. On the controller side, the standard newbus probe and attach methods are implemented. -This driver also implements the -.Fn fdt_pinctrl_configure -method, in which it calls the +As part of handling attach, it calls the .Fn fdt_pinctrl_register function to register itself as a pinmux controller. Then .Fn fdt_pinctrl_configure_tree is used to walk the device tree and configure pins specified by the pinctrl-0 property for all active devices. +The driver also implements the +.Fn fdt_pinctrl_configure +method, which allows client devices to change their +pin configurations after startup. If a client device requires a pin configuration change at some point of its lifecycle, it uses the .Fn fdt_pinctrl_configure @@ -84,14 +86,9 @@ registers a pinctrl driver so that it can be used by o .Fn fdt_pinctrl_configure or .Fn fdt_pinctrl_configure_by_name . -The -.Fa pinprop -argument is the name of a property that -identifies each descendant of the pinctrl -node. -The pinctrl node is a pin configuration -node whose xref phandle can be passed to -.Fn FDT_PINCTRL_CONFIGURE . +It also registers each child node of the pinctrl driver's node which contains +a property with the name given in +.Fa pinprop . If .Fa pinprop is
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?201904220237.x3M2bkPZ056840>