Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753410Ab1B1KY0 (ORCPT ); Mon, 28 Feb 2011 05:24:26 -0500 Received: from mailhost.informatik.uni-hamburg.de ([134.100.9.70]:32870 "EHLO mailhost.informatik.uni-hamburg.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752706Ab1B1KYZ (ORCPT ); Mon, 28 Feb 2011 05:24:25 -0500 Message-ID: <4D6B7826.1030500@metafoo.de> Date: Mon, 28 Feb 2011 11:25:42 +0100 From: Lars-Peter Clausen User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.16) Gecko/20101226 Icedove/3.0.11 MIME-Version: 1.0 To: Kukjin Kim CC: "'Ben Dooks'" , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 08/09] ARM: s3c2440: gta02: Request usb pullup pin before using it References: <1297043521-21903-1-git-send-email-lars@metafoo.de> <1297043521-21903-8-git-send-email-lars@metafoo.de> <000301cbd70f$12367070$36a35150$%kim@samsung.com> In-Reply-To: <000301cbd70f$12367070$36a35150$%kim@samsung.com> X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2670 Lines: 90 On 02/28/2011 07:16 AM, Kukjin Kim wrote: > Lars-Peter Clausen wrote: >> >> Request the gpio pin used to control the usb pullup before using it to > avoid >> a >> runtime warning about an auto-requested gpio. >> >> Signed-off-by: Lars-Peter Clausen >> --- >> arch/arm/mach-s3c2440/mach-gta02.c | 17 +++++++++++++++-- >> 1 files changed, 15 insertions(+), 2 deletions(-) >> >> diff --git a/arch/arm/mach-s3c2440/mach-gta02.c > b/arch/arm/mach-s3c2440/mach- >> gta02.c >> index 1396639..94456fa 100644 >> --- a/arch/arm/mach-s3c2440/mach-gta02.c >> +++ b/arch/arm/mach-s3c2440/mach-gta02.c >> @@ -451,11 +451,11 @@ static void gta02_udc_command(enum s3c2410_udc_cmd_e >> cmd) >> switch (cmd) { >> case S3C2410_UDC_P_ENABLE: >> pr_debug("%s S3C2410_UDC_P_ENABLE\n", __func__); >> - gpio_direction_output(GTA02_GPIO_USB_PULLUP, 1); >> + gpio_set_value(GTA02_GPIO_USB_PULLUP, 1); > > How about following instead? > gpio_request(GTA02_GPIO_USB_PULLUP, "USB_PULLUP"); > gpio_direction_output(GTA02_GPIO_USB_PULLUP, 1); > gpio_free(GTA02_GPIO_USB_PULLUP); > I don't think that is a good idea. This gpio should really be reserved for the udc driver. If it is freed again, it could be requested from someone else which could lead to undefined behaviour. >> break; >> case S3C2410_UDC_P_DISABLE: >> pr_debug("%s S3C2410_UDC_P_DISABLE\n", __func__); >> - gpio_direction_output(GTA02_GPIO_USB_PULLUP, 0); >> + gpio_set_value(GTA02_GPIO_USB_PULLUP, 0); >> break; >> case S3C2410_UDC_P_RESET: >> pr_debug("%s S3C2410_UDC_P_RESET\n", __func__); >> @@ -572,11 +572,24 @@ static void gta02_poweroff(void) >> pcf50633_reg_set_bit_mask(gta02_pcf, PCF50633_REG_OOCSHDWN, 1, 1); >> } >> >> +static void gta02_request_gpios(void) >> +{ >> + int ret; >> + ret = gpio_request_one(GTA02_GPIO_USB_PULLUP, GPIOF_OUT_INIT_LOW, >> + "USB pullup"); >> + if (ret) { >> + printk(KERN_ERR "Failed to request USB pullup gpio pin: > %d\n", >> + ret); >> + } >> +} >> + >> static void __init gta02_machine_init(void) >> { >> /* Set the panic callback to turn AUX LED on or off. */ >> panic_blink = gta02_panic_blink; >> >> + gta02_request_gpios(); >> + >> s3c_pm_init(); >> >> #ifdef CONFIG_CHARGER_PCF50633 >> -- > > > > Thanks. > > Best regards, > Kgene. > -- > Kukjin Kim , Senior Engineer, > SW Solution Development Team, Samsung Electronics Co., Ltd. > -- 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/