Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757360Ab3FSSSo (ORCPT ); Wed, 19 Jun 2013 14:18:44 -0400 Received: from devils.ext.ti.com ([198.47.26.153]:46100 "EHLO devils.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757299Ab3FSSS1 (ORCPT ); Wed, 19 Jun 2013 14:18:27 -0400 Message-ID: <51C1F5D6.3040304@ti.com> Date: Wed, 19 Jun 2013 13:17:58 -0500 From: Benoit Cousson Organization: Texas Instruments User-Agent: Mozilla/5.0 (X11; Linux i686; rv:17.0) Gecko/20130510 Thunderbird/17.0.6 MIME-Version: 1.0 To: Roger Quadros CC: , , , , Subject: Re: [PATCH v2 1/4] ARM: dts: omap4-panda: Add USB Host support References: <1371571487-14389-1-git-send-email-rogerq@ti.com> <1371571487-14389-2-git-send-email-rogerq@ti.com> <51C106A1.9030001@ti.com> <51C15F7E.5020305@ti.com> <20130619074605.GW5523@atomide.com> <51C183AC.8040801@ti.com> <51C19011.5050107@ti.com> <51C19E6C.4040802@epfl.ch> <51C1A2AE.2020506@ti.com> <51C1BA8C.6000703@ti.com> In-Reply-To: <51C1BA8C.6000703@ti.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3825 Lines: 101 On 06/19/2013 09:05 AM, Roger Quadros wrote: > On 06/19/2013 03:23 PM, Benoit Cousson wrote: >> On 06/19/2013 07:05 AM, Florian Vaussard wrote: >>> Hello, >>> >>> On 06/19/2013 01:03 PM, Roger Quadros wrote: >>>> On 06/19/2013 01:10 PM, Benoit Cousson wrote: >>>>> On 06/19/2013 02:46 AM, Tony Lindgren wrote: >>>>>> * Roger Quadros [130619 00:42]: >>>>>>> Hi Benoit, >>>>>>> >>>>>>> On 06/19/2013 04:17 AM, Benoit Cousson wrote: >>>>>>>> Hi Roger, >>>>>>>> >>>>>>>> On 06/18/2013 11:04 AM, Roger Quadros wrote: >>>>>>>>> Provide the RESET and Power regulators for the USB PHY, >>>>>>>>> the USB Host port mode and the PHY device. >>>>>>>>> >>>>>>>>> Also provide pin multiplexer information for the USB host >>>>>>>>> pins. >>>>>>>>> >>>>>>>>> Signed-off-by: Roger Quadros >>>>>>>>> --- >>>>>>>>> arch/arm/boot/dts/omap4-panda-common.dtsi | 62 >>>>>>>>> +++++++++++++++++++++++++++++ >>>>>>>>> 1 files changed, 62 insertions(+), 0 deletions(-) >>>>>>>>> >>>>>>>>> diff --git a/arch/arm/boot/dts/omap4-panda-common.dtsi >>>>>>>>> b/arch/arm/boot/dts/omap4-panda-common.dtsi >>>>>>>>> index 00cbaa5..7a21e8e 100644 >>>>>>>>> --- a/arch/arm/boot/dts/omap4-panda-common.dtsi >>>>>>>>> +++ b/arch/arm/boot/dts/omap4-panda-common.dtsi >>>>>>>>> @@ -59,6 +59,42 @@ >>>>>>>>> "AFML", "Line In", >>>>>>>>> "AFMR", "Line In"; >>>>>>>>> }; >>>>>>>>> + >>>>>>>>> + /* HS USB Port 1 RESET */ >>>>>>>>> + hsusb1_reset: hsusb1_reset_reg { >>>>>>>>> + compatible = "regulator-fixed"; >>>>>>>>> + regulator-name = "hsusb1_reset"; >>>>>>>>> + regulator-min-microvolt = <3300000>; >>>>>>>>> + regulator-max-microvolt = <3300000>; >>>>>>>>> + gpio = <&gpio2 30 0>; /* gpio_62 */ >>>>>>>>> + startup-delay-us = <70000>; >>>>>>>>> + enable-active-high; >>>>>>>>> + }; >>>>>>>> >>>>>>>> Is this really a regulator? Or just a GPIO line used to reset the >>>>>>>> USB PHY? >>>>>>> >>>>>>> It is in fact a GPIO line used as reset. >>>>>>>> >>>>>>>> If this is the case, I don't think it should be represented as a >>>>>>>> regulator. >>>>>>> >>>>>>> Why not? I think it fits very well in the regulator device model. >>>>> >>>>> I'm not sure fitting very well is the correct term. >>>>> It works, for sure, but it is no different than when we were trying >>>>> to abuse the regulator fmwk to enable the 32k clock in phoenix. >>>>> It is just a hack. >>>>> >>>> >>>> The only difference is there is a dedicated framework for clocks. >>>> Since there is nothing specific to >>>> handle reset lines it is left to the driver writer how he wants to >>>> manage it. >>>> >>> >>> There is a proposed binding for gpio-controlled reset lines, but it is >>> not yet merged [1]. >>> I guess it can fit most usage patterns, and it can be an interesting >>> move in the future. >> >> I'm glad to see that I was not the only one thinking that the regulator was not the right fmwk to do that :-) >> >> Thanks for the pointer Florian. > > Thanks again Florian. >> >> I guess that series should be merged for 3.11? Based on the thread, it should to through arm-soc. >> >> Roger, >> >> It might be tricky to have dependency on that series, but if this is possible, you should try. Otherwise, just keep the existing one, adding that a new solution will be available soon as a disclaimer. >> > > I will rework the PHY driver to use the new gpio-reset driver. But for 3.11 let's proceed the way it is. > I'll resend this one with a disclaimer. OK, sounds good. Thanks, Benoit -- 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/