Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751092AbdHAELx (ORCPT ); Tue, 1 Aug 2017 00:11:53 -0400 Received: from hs01.dk-develop.de ([213.136.71.231]:39048 "EHLO hs01.dk-develop.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750752AbdHAELw (ORCPT ); Tue, 1 Aug 2017 00:11:52 -0400 MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Tue, 01 Aug 2017 06:11:56 +0200 From: danilokrummrich@dk-develop.de To: Randy Dunlap Cc: linux-kernel@vger.kernel.org, linux-input@vger.kernel.org, dmitry.torokhov@gmail.com, linus.walleij@linaro.org Subject: Re: [PATCH v2] serio: PS2 gpio bit banging driver for the serio bus In-Reply-To: <29d8794c-93ae-c609-8a24-38325a32fddd@infradead.org> References: <20170731223557.23845-1-danilokrummrich@dk-develop.de> <29d8794c-93ae-c609-8a24-38325a32fddd@infradead.org> Message-ID: User-Agent: Roundcube Webmail/1.3.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2056 Lines: 58 On 2017-08-01 01:34, Randy Dunlap wrote: > On 07/31/2017 03:35 PM, Danilo Krummrich wrote: > >> diff --git a/Documentation/gpio/drivers-on-gpio.txt >> b/Documentation/gpio/drivers-on-gpio.txt >> index 3065132..b106e72 100644 >> --- a/Documentation/gpio/drivers-on-gpio.txt >> +++ b/Documentation/gpio/drivers-on-gpio.txt >> @@ -84,6 +84,11 @@ hardware descriptions such as device tree or ACPI: >> NAND flash MTD subsystem and provides chip access and partition >> parsing like >> any other NAND driving hardware. >> >> +- ps2-gpio: drivers/input/serio/ps2-gpio.c is used to drive an PS2 >> serio bus, > > drive a PS2 > Is this PS2 as in IBM Micro Channel or PlayStation 2? > It's the PS/2 mouse/keyboard protocol introduced by IBM. >> + data and clock line, by bit banging two GPIO lines. It will appear >> as any >> + other serio bus to the system and makes it possible to connect >> drivers for >> + e.g. keyboards and other PS2 protocol based devices. >> + >> Apart from this there are special GPIO drivers in subsystems like >> MMC/SD to >> read card detect and write protect GPIO lines, and in the TTY serial >> subsystem >> to emulate MCTRL (modem control) signals CTS/RTS by using two GPIO >> lines. The >> diff --git a/drivers/input/serio/Kconfig b/drivers/input/serio/Kconfig >> index c3d05b4..abca0e0 100644 >> --- a/drivers/input/serio/Kconfig >> +++ b/drivers/input/serio/Kconfig >> @@ -292,6 +292,16 @@ config SERIO_SUN4I_PS2 >> To compile this driver as a module, choose M here: the >> module will be called sun4i-ps2. >> >> +config SERIO_GPIO_PS2 >> + tristate "GPIO PS/2 bit banging driver" > > depends on GPIO > ?? > Thank you, missed that. >> + help >> + Say Y here if you want PS/2 bit banging support via GPIO. >> + >> + To compile this driver as a module, choose M here: the >> + module will be called gpio-ps2. >> + >> + If you are unsure, say N. >> + >> config USERIO >> tristate "User space serio port driver support" >> help