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=-11.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 05819C32751 for ; Mon, 5 Aug 2019 10:54:36 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D13112087B for ; Mon, 5 Aug 2019 10:54:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728423AbfHEKyf convert rfc822-to-8bit (ORCPT ); Mon, 5 Aug 2019 06:54:35 -0400 Received: from mail-ed1-f65.google.com ([209.85.208.65]:44033 "EHLO mail-ed1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727158AbfHEKye (ORCPT ); Mon, 5 Aug 2019 06:54:34 -0400 Received: by mail-ed1-f65.google.com with SMTP id k8so78182648edr.11; Mon, 05 Aug 2019 03:54:32 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:content-transfer-encoding; bh=Sv8pVXgrrDrbIAonY+C88fg7ixy9vYBYQXBP0fHLLv8=; b=VoQIT4o+NKMDU1veQCCYqRd4c6fS3KiocAi2AbYIipCi/5y7mvcdnBPoNxg+VWeFr6 qd7O4AEIsD+xuArCgZRiYRxurcyY7alBMPOIAEo08srFU+IEX4h65hsY23C1Rn0BFXrw YEdClWxRHgBdLRfvtbkvunbJC+Ln6f30glqQ/8W7Oc8HjIsHv+TH+pRq2SY5Lt2FY0Jw 5yKUhjPlRcCQYqm8WZSiZ/Uu4wFt1Fid5PghsaD9KE861FEme3UQ0hLgY6j/c2KkJNmH pMc4+pu5VwsgRsAFF0L8IkwPvXHFdZNpD/kxjFV1MkGs0HHWbqtLyCgWJ0/aoANpT3bL xhAw== X-Gm-Message-State: APjAAAXaM9qUinCPzuBF+BuKF/KqHPgxvS4pXOe265qUtgGbk7JLElA7 krwO/QIyPSvAlacB6UNGl2nm5Oz0Uj8= X-Google-Smtp-Source: APXvYqw1M/sk8Rd0FDUYGuD0LRvQbA6oYhjBhAy9Z/XRedeDP4PKnoLDN7nkr5AfahYE7yipoo/yAg== X-Received: by 2002:a50:9168:: with SMTP id f37mr134647181eda.242.1565002471414; Mon, 05 Aug 2019 03:54:31 -0700 (PDT) Received: from mail-wm1-f51.google.com (mail-wm1-f51.google.com. [209.85.128.51]) by smtp.gmail.com with ESMTPSA id nc6sm14270316ejb.62.2019.08.05.03.54.30 (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Mon, 05 Aug 2019 03:54:31 -0700 (PDT) Received: by mail-wm1-f51.google.com with SMTP id a15so74268487wmj.5; Mon, 05 Aug 2019 03:54:30 -0700 (PDT) X-Received: by 2002:a1c:c545:: with SMTP id v66mr18768923wmf.51.1565002470670; Mon, 05 Aug 2019 03:54:30 -0700 (PDT) MIME-Version: 1.0 References: <20190412120730.473-1-megous@megous.com> <20190412120730.473-3-megous@megous.com> <20190805104529.z3mex3m2tss7lzlr@core.my.home> In-Reply-To: <20190805104529.z3mex3m2tss7lzlr@core.my.home> From: Chen-Yu Tsai Date: Mon, 5 Aug 2019 18:54:17 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [linux-sunxi] [PATCH 2/3] rtc: sun6i: Add support for H6 RTC To: =?UTF-8?Q?Ond=C5=99ej_Jirman?= , Chen-Yu Tsai , Alessandro Zummo , Alexandre Belloni , Rob Herring , Mark Rutland , Maxime Ripard , linux-rtc@vger.kernel.org, devicetree , linux-arm-kernel , linux-kernel , linux-sunxi Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Aug 5, 2019 at 6:45 PM Ondřej Jirman wrote: > > On Mon, Aug 05, 2019 at 06:16:14PM +0800, Chen-Yu Tsai wrote: > > On Fri, Apr 12, 2019 at 8:07 PM megous via linux-sunxi > > wrote: > > > > > > From: Ondrej Jirman > > > > > > RTC on H6 is mostly the same as on H5 and H3. It has slight differences > > > mostly in features that are not yet supported by this driver. > > > > > > Some differences are already stated in the comments in existing code. > > > One other difference is that H6 has extra bit in LOSC_CTRL_REG, called > > > EXT_LOSC_EN to enable/disable external low speed crystal oscillator. > > > > > > It also has bit EXT_LOSC_STA in LOSC_AUTO_SWT_STA_REG, to check whether > > > external low speed oscillator is working correctly. > > > > > > This patch adds support for enabling LOSC when necessary: > > > > > > - during reparenting > > > - when probing the clock > > > > > > H6 also has capacbility to automatically reparent RTC clock from > > > external crystal oscillator, to internal RC oscillator, if external > > > oscillator fails. This is enabled by default. Disable it during > > > probe. > > > > > > Signed-off-by: Ondrej Jirman > > > --- > > > drivers/rtc/rtc-sun6i.c | 40 ++++++++++++++++++++++++++++++++++++++-- > > > 1 file changed, 38 insertions(+), 2 deletions(-) > > > > > > diff --git a/drivers/rtc/rtc-sun6i.c b/drivers/rtc/rtc-sun6i.c > > > index 11f56de52179..7375a530c565 100644 > > > --- a/drivers/rtc/rtc-sun6i.c > > > +++ b/drivers/rtc/rtc-sun6i.c > > > @@ -41,9 +41,11 @@ > > > /* Control register */ > > > #define SUN6I_LOSC_CTRL 0x0000 > > > #define SUN6I_LOSC_CTRL_KEY (0x16aa << 16) > > > +#define SUN6I_LOSC_CTRL_AUTO_SWT_BYPASS BIT(15) > > > > Manual says bit 14? Or is this different from LOSC_AUTO_SWT_EN? > > > > The rest looks ok. > > To give you more information. This is a new thing in H6 BSP, compared > to BSPs for previous SoCs (H5/H3). > > 20 #define REG_CLK32K_AUTO_SWT_EN BIT(14) > 21 #define REG_CLK32K_AUTO_SWT_BYPASS BIT(15) > > Init sequence changed in H6 BSP to: > > 646 /* > 647 * Step1: select RTC clock source > 648 */ > 649 tmp_data = readl(chip->base + SUNXI_LOSC_CTRL); > 650 tmp_data &= (~REG_CLK32K_AUTO_SWT_EN); > 651 > 652 /* Disable auto switch function */ > 653 tmp_data |= REG_CLK32K_AUTO_SWT_BYPASS; > 654 writel(tmp_data, chip->base + SUNXI_LOSC_CTRL); > 655 > 656 tmp_data = readl(chip->base + SUNXI_LOSC_CTRL); > 657 tmp_data |= (RTC_SOURCE_EXTERNAL | REG_LOSCCTRL_MAGIC); > 658 writel(tmp_data, chip->base + SUNXI_LOSC_CTRL); > 659 > 660 /* We need to set GSM after change clock source */ > 661 udelay(10); > 662 tmp_data = readl(chip->base + SUNXI_LOSC_CTRL); > 663 tmp_data |= (EXT_LOSC_GSM | REG_LOSCCTRL_MAGIC); > 664 writel(tmp_data, chip->base + SUNXI_LOSC_CTRL); > 665 I don't have this in my H6 BSPs. One is H6 Lichee v1.1 downloaded from Pine64. The link was from linux-sunxi wiki's H6 page. The other is a 4.9 kernel tree, which I believe is from Allwinner's github: https://github.com/Allwinner-Homlet/H6-BSP4.9-linux > For older BSPs, the init sequence looked like this: > > 482 /* > 483 * Step1: select RTC clock source > 484 */ > 485 tmp_data = sunxi_rtc_read(SUNXI_LOSC_CTRL_REG); > 486 tmp_data &= (~REG_CLK32K_AUTO_SWT_EN); > 487 tmp_data |= (RTC_SOURCE_EXTERNAL | REG_LOSCCTRL_MAGIC); > 488 tmp_data |= (EXT_LOSC_GSM); > 489 sunxi_rtc_write(tmp_data, SUNXI_LOSC_CTRL_REG); > 490 > > EXT_LOSC_GSM has values 4 values from low to high, and I guess it configures > gain for the oscillator's amplifier in the feedback loop of the circuit. > > So the new code, for some reason changed from single write to sequence > of individual writes/config steps: > > 1) disable auto-switch and enable auto-switch bypass > 2) select RTC clock source (to LOSC) > (wait) Maybe it's possible to glitch if these two are combined? > 3) configure gain on the LOSC > > regards, > o. > > > ChenYu > > -- > You received this message because you are subscribed to the Google Groups "linux-sunxi" group. > To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscribe@googlegroups.com. > To view this discussion on the web, visit https://groups.google.com/d/msgid/linux-sunxi/20190805104529.z3mex3m2tss7lzlr%40core.my.home. 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[209.85.128.43]) by smtp.gmail.com with ESMTPSA id y22sm19011095edw.94.2019.08.05.03.54.30 for (version=TLS1_3 cipher=AEAD-AES128-GCM-SHA256 bits=128/128); Mon, 05 Aug 2019 03:54:31 -0700 (PDT) Received: by mail-wm1-f43.google.com with SMTP id g67so68427489wme.1 for ; Mon, 05 Aug 2019 03:54:30 -0700 (PDT) X-Received: by 2002:a1c:c545:: with SMTP id v66mr18768923wmf.51.1565002470670; Mon, 05 Aug 2019 03:54:30 -0700 (PDT) MIME-Version: 1.0 References: <20190412120730.473-1-megous@megous.com> <20190412120730.473-3-megous@megous.com> <20190805104529.z3mex3m2tss7lzlr@core.my.home> In-Reply-To: <20190805104529.z3mex3m2tss7lzlr@core.my.home> From: Chen-Yu Tsai Date: Mon, 5 Aug 2019 18:54:17 +0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [linux-sunxi] [PATCH 2/3] rtc: sun6i: Add support for H6 RTC To: =?UTF-8?Q?Ond=C5=99ej_Jirman?= , Chen-Yu Tsai , Alessandro Zummo , Alexandre Belloni , Rob Herring , Mark Rutland , Maxime Ripard , linux-rtc@vger.kernel.org, devicetree , 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