From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9FCC0C4360C for ; Sun, 29 Sep 2019 21:21:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7862321882 for ; Sun, 29 Sep 2019 21:21:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729199AbfI2VV4 (ORCPT ); Sun, 29 Sep 2019 17:21:56 -0400 Received: from gloria.sntech.de ([185.11.138.130]:45862 "EHLO gloria.sntech.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726360AbfI2VVz (ORCPT ); Sun, 29 Sep 2019 17:21:55 -0400 Received: from ip5f5a6266.dynamic.kabel-deutschland.de ([95.90.98.102] helo=phil.localnet) by gloria.sntech.de with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.89) (envelope-from ) id 1iEgdL-0001at-6x; Sun, 29 Sep 2019 23:21:35 +0200 From: Heiko Stuebner To: Jagan Teki Cc: Levin Du , Akash Gajjar , Rob Herring , Mark Rutland , Da Xue , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-kernel@vger.kernel.org, linux-amarula@amarulasolutions.com Subject: Re: [PATCH 1/6] arm64: dts: rockchip: Fix rk3399-roc-pc pwm2 pin Date: Sun, 29 Sep 2019 23:21:34 +0200 Message-ID: <6797961.eJj5WIFbM9@phil> In-Reply-To: <20190919052822.10403-2-jagan@amarulasolutions.com> References: <20190919052822.10403-1-jagan@amarulasolutions.com> <20190919052822.10403-2-jagan@amarulasolutions.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Jagan, Am Donnerstag, 19. September 2019, 07:28:17 CEST schrieb Jagan Teki: > ROC-PC is not able to boot linux console if PWM2_d is > unattached to any pinctrl logic. > > To be precise the linux boot hang with last logs as, > ... > ..... > [ 0.003367] Console: colour dummy device 80x25 > [ 0.003788] printk: console [tty0] enabled > [ 0.004178] printk: bootconsole [uart8250] disabled > > In ROC-PC the PWM2_d pin is connected to LOG_DVS_PWM of > VDD_LOG. So, for normal working operations this needs to > active and pull-down. > > This patch fix, by attaching pinctrl active and pull-down > the pwm2. This looks highly dubious on first glance. The pwm subsystem nor the Rockchip pwm driver do not do any pinctrl handling. So I don't really see where that "active" pinctrl state is supposed to come from. Comparing with the pwm driver in the vendor tree I see that there is such a state defined there. But that code there also looks strange as that driver never again leaves this active state after entering it. Also for example all the Gru devices run with quite a number of pwm- regulators without needing additional fiddling with the pwm itself, so I don't really see why that should be different here. Heiko > > Signed-off-by: Jagan Teki > --- > arch/arm64/boot/dts/rockchip/rk3399-roc-pc.dts | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/arm64/boot/dts/rockchip/rk3399-roc-pc.dts b/arch/arm64/boot/dts/rockchip/rk3399-roc-pc.dts > index 19f7732d728c..c53f3d571620 100644 > --- a/arch/arm64/boot/dts/rockchip/rk3399-roc-pc.dts > +++ b/arch/arm64/boot/dts/rockchip/rk3399-roc-pc.dts > @@ -548,6 +548,8 @@ > }; > > &pwm2 { > + pinctrl-names = "active"; > + pinctrl-0 = <&pwm2_pin_pull_down>; > status = "okay"; > }; > >