Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S935483AbaDJKc6 (ORCPT ); Thu, 10 Apr 2014 06:32:58 -0400 Received: from mail-qc0-f177.google.com ([209.85.216.177]:47509 "EHLO mail-qc0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934795AbaDJKcx (ORCPT ); Thu, 10 Apr 2014 06:32:53 -0400 MIME-Version: 1.0 In-Reply-To: <53465FB9.7070002@ti.com> References: <1397044485-26483-1-git-send-email-gautam.vivek@samsung.com> <53465FB9.7070002@ti.com> Date: Thu, 10 Apr 2014 16:02:52 +0530 Message-ID: Subject: Re: [PATCH] phy: exynos5-usbdrd: Add facility to toggle vbus gpio on/off From: Vivek Gautam To: Kishon Vijay Abraham I Cc: Linux USB Mailing List , "linux-samsung-soc@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "devicetree@vger.kernel.org" , linux-doc@vger.kernel.org, Greg KH , Felipe Balbi , Kukjin Kim , Tomasz Figa , Kamil Debski , Jingoo Han , Sylwester Nawrocki Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Kishon, On Thu, Apr 10, 2014 at 2:39 PM, Kishon Vijay Abraham I wrote: > Hi. > > On Wednesday 09 April 2014 05:24 PM, Vivek Gautam wrote: >> Adding support to enable/disable VBUS hooked to a gpio >> to enable vbus supply on the port. >> >> Signed-off-by: Vivek Gautam >> --- >> >> Based on 'phy-exynos5-usbdrd' patches: >> [PATCH V4 0/5] Add Exynos5 USB 3.0 phy driver based on generic PHY framework >> http://www.spinics.net/lists/linux-usb/msg105507.html >> >> drivers/phy/phy-exynos5-usbdrd.c | 18 ++++++++++++++++++ >> 1 file changed, 18 insertions(+) >> >> diff --git a/drivers/phy/phy-exynos5-usbdrd.c b/drivers/phy/phy-exynos5-usbdrd.c >> index ff54a7c..5ca7485 100644 >> --- a/drivers/phy/phy-exynos5-usbdrd.c >> +++ b/drivers/phy/phy-exynos5-usbdrd.c >> @@ -18,6 +18,7 @@ >> #include >> #include >> #include >> +#include >> #include >> #include >> #include >> @@ -176,6 +177,7 @@ struct exynos5_usbdrd_phy { >> struct clk *ref_clk; >> unsigned long ref_rate; >> unsigned int refclk_reg; >> + int gpio; >> }; >> >> #define to_usbdrd_phy(inst) \ >> @@ -460,6 +462,9 @@ static int exynos5_usbdrd_phy_power_on(struct phy *phy) >> if (!IS_ERR(phy_drd->usb30_sclk)) >> clk_prepare_enable(phy_drd->usb30_sclk); >> >> + /* Toggle VBUS gpio - on */ >> + gpio_set_value(phy_drd->gpio, 1); >> + >> /* Power-on PHY*/ >> inst->phy_cfg->phy_isol(inst, 0); >> >> @@ -476,6 +481,9 @@ static int exynos5_usbdrd_phy_power_off(struct phy *phy) >> /* Power-off the PHY */ >> inst->phy_cfg->phy_isol(inst, 1); >> >> + /* Toggle VBUS gpio - off */ >> + gpio_set_value(phy_drd->gpio, 0); >> + >> if (!IS_ERR(phy_drd->usb30_sclk)) >> clk_disable_unprepare(phy_drd->usb30_sclk); >> >> @@ -585,6 +593,16 @@ static int exynos5_usbdrd_phy_probe(struct platform_device *pdev) >> >> phy_drd->drv_data = drv_data; >> >> + /* Get required GPIO for vbus */ >> + phy_drd->gpio = of_get_named_gpio(dev->of_node, >> + "samsung,vbus-gpio", 0); > > Is this dt property documented somewhere? >> + if (!gpio_is_valid(phy_drd->gpio)) >> + dev_dbg(dev, "no usbdrd-phy vbus gpio defined\n"); > > No return here? Can the PHY be functional even without the VBUS? On few boards, the switch IC's enable may no be controlled by a GPIO, rather enabled by default. So in those cases we may not want to stop PHY probe, when the VBUS GPIO is not present. -- Best Regards Vivek Gautam Samsung R&D Institute, Bangalore India -- 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/