From patchwork Sun Dec 20 14:31:29 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chanwoo Choi X-Patchwork-Id: 7892201 X-Patchwork-Delegate: geert@linux-m68k.org Return-Path: X-Original-To: patchwork-linux-sh@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 176389F349 for ; Sun, 20 Dec 2015 14:32:25 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id B2E09204AD for ; Sun, 20 Dec 2015 14:32:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 587692045A for ; Sun, 20 Dec 2015 14:32:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754174AbbLTObc (ORCPT ); Sun, 20 Dec 2015 09:31:32 -0500 Received: from mail-io0-f193.google.com ([209.85.223.193]:34615 "EHLO mail-io0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753042AbbLTOba (ORCPT ); Sun, 20 Dec 2015 09:31:30 -0500 Received: by mail-io0-f193.google.com with SMTP id k127so144196iok.1; Sun, 20 Dec 2015 06:31:30 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:reply-to:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=XoJt+DedOuaf+XguAwjODU1mYS5YolU2o3rfkC2cFyI=; b=ugfNcyFVXcvHaVdq70Cr9Zi5fWwiOTM9ZbNvhkN2gBhQYzDX7vxyia6KEMbdA/vOJL ES2afANGA+m38GIi0KFxQJV3BRj5v3Q5v5RB8Pq7yq60xf4CX9nwqIKtZ8aJkCXEnvEY OqViUmG4OD3sDwsqUoa606zEjJ04h+fYNK4ogyixppFDNoJLljfrVQRYj7u45B06ziwH muEhtKc7Q//bl06QI6qJRpumDV6ah5GE4u+YSeZfZLXX+wnjDzrvSc1q1cuoCUWORBWQ 6CYBQ+azQVIWvLmWYYzyvsTwx4u2gzcPGgrWrGeUI0PS/Gu6ddOXfpR6P7OFBozHsJRH WVnQ== MIME-Version: 1.0 X-Received: by 10.107.34.8 with SMTP id i8mr14365671ioi.10.1450621889667; Sun, 20 Dec 2015 06:31:29 -0800 (PST) Received: by 10.107.47.149 with HTTP; Sun, 20 Dec 2015 06:31:29 -0800 (PST) Reply-To: cw00.choi@samsung.com In-Reply-To: <5948633.my3nAG6hRz@wasted.cogentembedded.com> References: <5948633.my3nAG6hRz@wasted.cogentembedded.com> Date: Sun, 20 Dec 2015 23:31:29 +0900 Message-ID: Subject: Re: [PATCH v5] extcon: add Maxim MAX3355 driver From: Chanwoo Choi To: Sergei Shtylyov Cc: Rob Herring , Pawel Moll , Mark Rutland , Ian Campbell , Kumar Gala , "myungjoo.ham@samsung.com" , devicetree , linux-kernel , linux-sh@vger.kernel.org, linux-usb@vger.kernel.org Sender: linux-sh-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-sh@vger.kernel.org X-Spam-Status: No, score=-6.8 required=5.0 tests=BAYES_00, DKIM_ADSP_CUSTOM_MED, DKIM_SIGNED, FREEMAIL_FROM, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, T_DKIM_INVALID, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Hi, This patch depend on GPIOLIB configuration as following: I modified it with following diff and applied it. Thanks, Chanwoo Choi On Sat, Dec 19, 2015 at 8:17 AM, Sergei Shtylyov wrote: > Maxim Integrated MAX3355E chip integrates a charge pump and comparators to > enable a system with an integrated USB OTG dual-role transceiver to > function as an USB OTG dual-role device. In addition to sensing/controlling > Vbus, the chip also passes thru the ID signal from the USB OTG connector. > On some Renesas boards, this signal is just fed into the SoC thru a GPIO > pin -- there's no real OTG controller, only host and gadget USB controllers > sharing the same USB bus; however, we'd like to allow host or gadget > drivers to be loaded depending on the cable type, hence the need for the > MAX3355 extcon driver. The Vbus status signals are also wired to GPIOs > (however, we aren't currently interested in them), the OFFVBUS# signal is > controlled by the host controllers, there's also the SHDN# signal wired to > a GPIO, it should be driven high for the normal operation. > > Signed-off-by: Sergei Shtylyov > Acked-by: Chanwoo Choi > > --- > Changes in version 5: > - removed unused variable in the probe() method; > - removed reference to the Koelsch board from the binding document; > - added Chanwoo Choi's ACK. > > Changes in version 4: > - stopped calling kstrdup() for the device name; > - removed unneeded 'owner' field initializer; > - moved devm_extcon_allocate() call further down in the probe() method; > - extended the driver copyright; > - indented the continuation lines in the binding document. > > Changes in version 3: > - reformatted the change log. > > Changes in version 2: > - added the USB gadget cable support; > - added the remove() driver method which drives SHDN# GPIO low to save power; > - dropped vendor prefix from the ID GPIO property name; > - changed the GPIO property name suffix to "-gpios"; > - switched to usign extcon_set_cable_state_() API; > - switched to using the gpiod/sleeping 'gpiolib' APIs; > - addded error messages to max3355_probe(); > - added IRQF_NO_SUSPEND flasg to the devm_request_threaded_irq() call; > - renamed 'ret' variable to 'err' in max3355_probe(); > - expanded the Kconfig entry help text; > - added vendor name to the patch summary, the bindings document, the Kconfig > entry, the driver heading comment, the module description, and the change log; > - fixed up and reformatted the change log. > > Documentation/devicetree/bindings/extcon/extcon-max3355.txt | 21 + > drivers/extcon/Kconfig | 8 > drivers/extcon/Makefile | 1 > drivers/extcon/extcon-max3355.c | 150 ++++++++++++ > 4 files changed, 180 insertions(+) > > Index: extcon/Documentation/devicetree/bindings/extcon/extcon-max3355.txt > =================================================================== > --- /dev/null > +++ extcon/Documentation/devicetree/bindings/extcon/extcon-max3355.txt > @@ -0,0 +1,21 @@ > +Maxim Integrated MAX3355 USB OTG chip > +------------------------------------- > + > +MAX3355 integrates a charge pump and comparators to enable a system with an > +integrated USB OTG dual-role transceiver to function as a USB OTG dual-role > +device. > + > +Required properties: > +- compatible: should be "maxim,max3355"; > +- maxim,shdn-gpios: should contain a phandle and GPIO specifier for the GPIO pin > + connected to the MAX3355's SHDN# pin; > +- id-gpios: should contain a phandle and GPIO specifier for the GPIO pin > + connected to the MAX3355's ID_OUT pin. > + > +Example: > + > + usb-otg { > + compatible = "maxim,max3355"; > + maxim,shdn-gpios = <&gpio2 4 GPIO_ACTIVE_LOW>; > + id-gpios = <&gpio5 31 GPIO_ACTIVE_HIGH>; > + }; > Index: extcon/drivers/extcon/Kconfig > =================================================================== > --- extcon.orig/drivers/extcon/Kconfig > +++ extcon/drivers/extcon/Kconfig > @@ -52,6 +52,14 @@ config EXTCON_MAX14577 > Maxim MAX14577/77836. The MAX14577/77836 MUIC is a USB port accessory > detector and switch. > > +config EXTCON_MAX3355 > + tristate "Maxim MAX3355 USB OTG EXTCON Support" > + help > + If you say yes here you get support for the USB OTG role detection by > + MAX3355. The MAX3355 chip integrates a charge pump and comparators to > + enable a system with an integrated USB OTG dual-role transceiver to > + function as an USB OTG dual-role device. > + > config EXTCON_MAX77693 > tristate "Maxim MAX77693 EXTCON Support" > depends on MFD_MAX77693 && INPUT > Index: extcon/drivers/extcon/Makefile > =================================================================== > --- extcon.orig/drivers/extcon/Makefile > +++ extcon/drivers/extcon/Makefile > @@ -8,6 +8,7 @@ obj-$(CONFIG_EXTCON_ARIZONA) += extcon-a > obj-$(CONFIG_EXTCON_AXP288) += extcon-axp288.o > obj-$(CONFIG_EXTCON_GPIO) += extcon-gpio.o > obj-$(CONFIG_EXTCON_MAX14577) += extcon-max14577.o > +obj-$(CONFIG_EXTCON_MAX3355) += extcon-max3355.o > obj-$(CONFIG_EXTCON_MAX77693) += extcon-max77693.o > obj-$(CONFIG_EXTCON_MAX77843) += extcon-max77843.o > obj-$(CONFIG_EXTCON_MAX8997) += extcon-max8997.o > Index: extcon/drivers/extcon/extcon-max3355.c > =================================================================== > --- /dev/null > +++ extcon/drivers/extcon/extcon-max3355.c > @@ -0,0 +1,150 @@ > +/* > + * Maxim Integrated MAX3355 USB OTG chip extcon driver > + * > + * Copyright (C) 2014-2015 Cogent Embedded, Inc. > + * Author: Sergei Shtylyov > + * > + * This software is licensed under the terms of the GNU General Public > + * License version 2, as published by the Free Software Foundation, and > + * may be copied, distributed, and modified under those terms. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +struct max3355_data { > + struct extcon_dev *edev; > + struct gpio_desc *id_gpiod; > + struct gpio_desc *shdn_gpiod; > +}; > + > +static const unsigned int max3355_cable[] = { > + EXTCON_USB, > + EXTCON_USB_HOST, > + EXTCON_NONE, > +}; > + > +static irqreturn_t max3355_id_irq(int irq, void *dev_id) > +{ > + struct max3355_data *data = dev_id; > + int id = gpiod_get_value_cansleep(data->id_gpiod); > + > + if (id) { > + /* > + * ID = 1 means USB HOST cable detached. > + * As we don't have event for USB peripheral cable attached, > + * we simulate USB peripheral attach here. > + */ > + extcon_set_cable_state_(data->edev, EXTCON_USB_HOST, false); > + extcon_set_cable_state_(data->edev, EXTCON_USB, true); > + } else { > + /* > + * ID = 0 means USB HOST cable attached. > + * As we don't have event for USB peripheral cable detached, > + * we simulate USB peripheral detach here. > + */ > + extcon_set_cable_state_(data->edev, EXTCON_USB, false); > + extcon_set_cable_state_(data->edev, EXTCON_USB_HOST, true); > + } > + > + return IRQ_HANDLED; > +} > + > +static int max3355_probe(struct platform_device *pdev) > +{ > + struct max3355_data *data; > + struct gpio_desc *gpiod; > + int irq, err; > + > + data = devm_kzalloc(&pdev->dev, sizeof(struct max3355_data), > + GFP_KERNEL); > + if (!data) > + return -ENOMEM; > + > + gpiod = devm_gpiod_get(&pdev->dev, "id", GPIOD_IN); > + if (IS_ERR(gpiod)) { > + dev_err(&pdev->dev, "failed to get ID_OUT GPIO\n"); > + return PTR_ERR(gpiod); > + } > + data->id_gpiod = gpiod; > + > + gpiod = devm_gpiod_get(&pdev->dev, "maxim,shdn", GPIOD_OUT_HIGH); > + if (IS_ERR(gpiod)) { > + dev_err(&pdev->dev, "failed to get SHDN# GPIO\n"); > + return PTR_ERR(gpiod); > + } > + data->shdn_gpiod = gpiod; > + > + data->edev = devm_extcon_dev_allocate(&pdev->dev, max3355_cable); > + if (IS_ERR(data->edev)) { > + dev_err(&pdev->dev, "failed to allocate extcon device\n"); > + return PTR_ERR(data->edev); > + } > + > + err = devm_extcon_dev_register(&pdev->dev, data->edev); > + if (err < 0) { > + dev_err(&pdev->dev, "failed to register extcon device\n"); > + return err; > + } > + > + irq = gpiod_to_irq(data->id_gpiod); > + if (irq < 0) { > + dev_err(&pdev->dev, "failed to translate ID_OUT GPIO to IRQ\n"); > + return irq; > + } > + > + err = devm_request_threaded_irq(&pdev->dev, irq, NULL, max3355_id_irq, > + IRQF_ONESHOT | IRQF_NO_SUSPEND | > + IRQF_TRIGGER_RISING | > + IRQF_TRIGGER_FALLING, > + pdev->name, data); > + if (err < 0) { > + dev_err(&pdev->dev, "failed to request ID_OUT IRQ\n"); > + return err; > + } > + > + platform_set_drvdata(pdev, data); > + > + /* Perform initial detection */ > + max3355_id_irq(irq, data); > + > + return 0; > +} > + > +static int max3355_remove(struct platform_device *pdev) > +{ > + struct max3355_data *data = platform_get_drvdata(pdev); > + > + gpiod_set_value_cansleep(data->shdn_gpiod, 0); > + > + return 0; > +} > + > +static const struct of_device_id max3355_match_table[] = { > + { .compatible = "maxim,max3355", }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, max3355_match_table); > + > +static struct platform_driver max3355_driver = { > + .probe = max3355_probe, > + .remove = max3355_remove, > + .driver = { > + .name = "extcon-max3355", > + .of_match_table = max3355_match_table, > + }, > +}; > + > +module_platform_driver(max3355_driver); > + > +MODULE_AUTHOR("Sergei Shtylyov "); > +MODULE_DESCRIPTION("Maxim MAX3355 extcon driver"); > +MODULE_LICENSE("GPL v2"); > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ --- To unsubscribe from this list: send the line "unsubscribe linux-sh" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/drivers/extcon/Kconfig b/drivers/extcon/Kconfig index ba4db7d..3d89e60 100644 --- a/drivers/extcon/Kconfig +++ b/drivers/extcon/Kconfig @@ -54,6 +54,7 @@ config EXTCON_MAX14577 config EXTCON_MAX3355 tristate "Maxim MAX3355 USB OTG EXTCON Support" + depends on GPIOLIB || COMPILE_TEST help If you say yes here you get support for the USB OTG role detection by MAX3355. The MAX3355 chip integrates a charge pump and comparators to