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Fri, 21 Dec 2018 00:40:12 -0800 (PST) Date: Fri, 21 Dec 2018 08:40:10 +0000 From: Lee Jones To: Priit Laes Subject: Re: [PATCH v2 5/8] dt-bindings: mfd: axp20x: Add software based soft_start for AXP209 LDO3 Message-ID: <20181221084010.GR4497@dell> References: <25e67fe9b5397aa5f11bdd7026e4ae6be51dd18b.1544512919.git-series.plaes@plaes.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <25e67fe9b5397aa5f11bdd7026e4ae6be51dd18b.1544512919.git-series.plaes@plaes.org> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181221_004024_954067_EABD51B5 X-CRM114-Status: GOOD ( 16.53 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Maxime Ripard , Mark Brown , linux-sunxi , Liam Girdwood , linux-kernel@vger.kernel.org, Olliver Schinagl , Chen-Yu Tsai , Rob Herring , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVHVlLCAxMSBEZWMgMjAxOCwgUHJpaXQgTGFlcyB3cm90ZToKCj4gRnJvbTogT2xsaXZlciBT Y2hpbmFnbCA8b2xpdmVyQHNjaGluYWdsLm5sPgo+IAo+IEluIHRoZSBwYXN0LCB0aGVyZSBoYXZl IGJlZW4gd29yZHMgb24gdmFyaW91cyBsaXN0cyB0aGF0IGlmIExETzMgaXMKPiBkaXNhYmxlZCBp biB1LWJvb3QsIGJ1dCBlbmFibGVkIGluIHRoZSBEVFMsIHRoZSBheHAyMDkgZHJpdmVyIHdvdWxk Cj4gZmFpbCB0byBjb250aW51ZS9oYW5nLiBTZXZlcmFsIGVuYWJsZS9kaXNhYmxlIHBhdGNoZXMg aGF2ZSBiZWVuCj4gaXNzdWVzIHRvIGRldmljZXRyZWUncyBpbiBib3RoIHRoZSBrZXJuZWwgYW5k IHUtYm9vdCB0byBhZGRyZXNzCj4gdGhpcyBpc3N1ZS4KPiAKPiBXaGF0IHJlYWxseSBoYXBwZW5l ZCBob3dldmVyLCB3YXMgdGhhdCB0aGUgQVhQMjA5IHNodXRzIGRvd24gd2l0aG91dAo+IGEgbm90 aWNlIGFuZCB3aXRob3V0IHNldHRpbmcgYW4gaW50ZXJydXB0LiBUaGlzIGlzIGNhdXNlZCB3aGVu IExETzMKPiBnZXRzIG92ZXJsb2FkZWQsIGZvciBleGFtcGxlIHdpdGggbGFyZ2UgY2FwYWNpdG9y cyBvbiB0aGUgTERPMyBvdXRwdXQuCj4gCj4gTm9ybWFsbHksIHdlIHdvdWxkIGV4cGVjdCB0aGF0 IEFYUDIwOSB3b3VsZCBzb3VyY2UgMjAwIG1BIGFzIHBlcgo+IGRhdGFzaGVldCBhbmQgc2V0IGFu ZCB0cmlnZ2VyIGFuIGludGVycnVwdCB3aGVuIGJlaW5nIG92ZXJsb2FkZWQuCj4gRm9yIHNvbWUg cmVhc29uIGhvd2V2ZXIsIHRoaXMgZG9lcyBub3QgaGFwcGVuLgo+IAo+IEFzIGEgd29yay1hcm91 bmQsIGltcGxlbWVudCBzb2Z0d2FyZS1iYXNlZCAncmVndWxhdG9yLXNvZnQtc3RhcnQnCj4gcHJv cGVydHkgZm9yIEFYUDIwOSBMRE8zIHJlZ3VsYXRvciwgd2hpY2ggaXMgdXNlZCB0byBmaXJzdCBi cmluZyB1cAo+IHRoZSBMRE8zIHRvIHRoZSBsb3dlc3QgcG9zc2libGUgdm9sdGFnZSBhbmQgdGhl biBlbmFibGUgdGhlIExETy4KPiAKPiBBZnRlciB0aGF0LCB3ZSBjYW4gc2V0IHRoZSByZXF1ZXN0 ZWQgdm9sdGFnZSBhcyB1c3VhbC4KPiAKPiBDb21iaW5pbmcgdGhpcyBzZXR0aW5nIHdpdGggdGhl IHJlZ3VsYXRvci1yYW1wLWRlbGF5IGFsbG93cyBMRE8zIHRvCj4gY29tZSB1cCBzbG93bHkgYW5k IHN0YWdnZXJlZCwgcG90ZW50aWFsbHkgcmVkdWNpbmcgb3ZlcmFsbCBpbnJ1c2ggY3VycmVudC4K PiAKPiBTaWduZWQtb2ZmLWJ5OiBPbGxpdmVyIFNjaGluYWdsIDxvbGl2ZXJAc2NoaW5hZ2wubmw+ Cj4gU2lnbmVkLW9mZi1ieTogUHJpaXQgTGFlcyA8cGxhZXNAcGxhZXMub3JnPgo+IC0tLQo+ICBE b2N1bWVudGF0aW9uL2RldmljZXRyZWUvYmluZGluZ3MvbWZkL2F4cDIweC50eHQgfCAzICsrKwo+ ICAxIGZpbGUgY2hhbmdlZCwgMyBpbnNlcnRpb25zKCspCgpGb3IgbXkgb3duIHJlZmVyZW5jZToK ICBBY2tlZC1mb3ItTUZELWJ5OiBMZWUgSm9uZXMgPGxlZS5qb25lc0BsaW5hcm8ub3JnPgoKLS0g CkxlZSBKb25lcyBb5p2O55C85pavXQpMaW5hcm8gU2VydmljZXMgVGVjaG5pY2FsIExlYWQKTGlu YXJvLm9yZyDilIIgT3BlbiBzb3VyY2Ugc29mdHdhcmUgZm9yIEFSTSBTb0NzCkZvbGxvdyBMaW5h cm86IEZhY2Vib29rIHwgVHdpdHRlciB8IEJsb2cKCl9fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fCmxpbnV4LWFybS1rZXJuZWwgbWFpbGluZyBsaXN0CmxpbnV4 LWFybS1rZXJuZWxAbGlzdHMuaW5mcmFkZWFkLm9yZwpodHRwOi8vbGlzdHMuaW5mcmFkZWFkLm9y Zy9tYWlsbWFuL2xpc3RpbmZvL2xpbnV4LWFybS1rZXJuZWwK From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lee Jones Subject: Re: [PATCH v2 5/8] dt-bindings: mfd: axp20x: Add software based soft_start for AXP209 LDO3 Date: Fri, 21 Dec 2018 08:40:10 +0000 Message-ID: <20181221084010.GR4497@dell> References: <25e67fe9b5397aa5f11bdd7026e4ae6be51dd18b.1544512919.git-series.plaes@plaes.org> Reply-To: lee.jones-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Return-path: Sender: linux-sunxi-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org Content-Disposition: inline In-Reply-To: <25e67fe9b5397aa5f11bdd7026e4ae6be51dd18b.1544512919.git-series.plaes-q/aMd4JkU83YtjvyW6yDsg@public.gmane.org> List-Post: , List-Help: , List-Archive: , List-Unsubscribe: , To: Priit Laes Cc: Rob Herring , Mark Rutland , Chen-Yu Tsai , Maxime Ripard , Liam Girdwood , Mark Brown , devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-arm-kernel-IAPFreCvJWM7uuMidbF8XUB+6BGkLq7r@public.gmane.org, Olliver Schinagl , linux-sunxi List-Id: devicetree@vger.kernel.org On Tue, 11 Dec 2018, Priit Laes wrote: > From: Olliver Schinagl >=20 > In the past, there have been words on various lists that if LDO3 is > disabled in u-boot, but enabled in the DTS, the axp209 driver would > fail to continue/hang. Several enable/disable patches have been > issues to devicetree's in both the kernel and u-boot to address > this issue. >=20 > What really happened however, was that the AXP209 shuts down without > a notice and without setting an interrupt. This is caused when LDO3 > gets overloaded, for example with large capacitors on the LDO3 output. >=20 > Normally, we would expect that AXP209 would source 200 mA as per > datasheet and set and trigger an interrupt when being overloaded. > For some reason however, this does not happen. >=20 > As a work-around, implement software-based 'regulator-soft-start' > property for AXP209 LDO3 regulator, which is used to first bring up > the LDO3 to the lowest possible voltage and then enable the LDO. >=20 > After that, we can set the requested voltage as usual. >=20 > Combining this setting with the regulator-ramp-delay allows LDO3 to > come up slowly and staggered, potentially reducing overall inrush current= . >=20 > Signed-off-by: Olliver Schinagl > Signed-off-by: Priit Laes > --- > Documentation/devicetree/bindings/mfd/axp20x.txt | 3 +++ > 1 file changed, 3 insertions(+) For my own reference: Acked-for-MFD-by: Lee Jones --=20 Lee Jones [=E6=9D=8E=E7=90=BC=E6=96=AF] Linaro Services Technical Lead Linaro.org =E2=94=82 Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog --=20 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 e= mail to linux-sunxi+unsubscribe-/JYPxA39Uh5TLH3MbocFF+G/Ez6ZCGd0@public.gmane.org For more options, visit https://groups.google.com/d/optout. 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=-5.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, USER_AGENT_MUTT 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 F0DCAC43387 for ; Fri, 21 Dec 2018 08:40:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B5FE1218FD for ; Fri, 21 Dec 2018 08:40:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=linaro.org header.i=@linaro.org header.b="Ce3g6XgA" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388138AbeLUIkP (ORCPT ); Fri, 21 Dec 2018 03:40:15 -0500 Received: from mail-wm1-f67.google.com ([209.85.128.67]:55246 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388072AbeLUIkP (ORCPT ); Fri, 21 Dec 2018 03:40:15 -0500 Received: by mail-wm1-f67.google.com with SMTP id a62so4480620wmh.4 for ; Fri, 21 Dec 2018 00:40:13 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:content-transfer-encoding:in-reply-to :user-agent; bh=tf1B/0sMesJfH+HmA4iAP0Sn3AZ4Gs7mp4+bQjMC6yQ=; b=Ce3g6XgAGR/pchMGQ49V8Snubp160RXDplkt9ta1jK2kH2sO+WZcC3B8EN0dCI4WHL sJK6r2sbKOs7a4xwnfWv+Gn8tHe5iHbdl2xT4JjUQ0C3Nd7KfjVi5Lh6WjfteGRturVK Y2QtwKsM22jiPp80nTFNc5Jo1HoQLteL1Uzck= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to:user-agent; bh=tf1B/0sMesJfH+HmA4iAP0Sn3AZ4Gs7mp4+bQjMC6yQ=; b=LDBb9hOmJtBDocGKgF0Qfw1zzHFd39N724mHx0VHwBmDUq2wx8dfiGgIWQkjcBm/c9 92UvMRmUMw0mQRYgdA1jHhxx2a0RVpW5AVy5a1MyBLbT3i7A3+maePFhKixbWJV7PxdI q0cY9DK2fmQlDEXRuiPrcsbjJHFOzoi9rQc5qI1T1Wy61onngXicH7xzfb5WLfrO+5Fn SXfixPr6+YR/QgOlWxS+lMtgqOtoGTHHDRYHnmP6fjCstrMTWVdjRS2H6ObucuGjuBZF a+iRQGKLYco6j/zVL4tTsnEG+h3qsjuEC5H8xyfRGS6PiYdd3b2GSCrawFJ4FBZBuCAf DICQ== X-Gm-Message-State: AJcUukcqkqyzNgc0izqEuH8YHNOkaapdsq+CbJ7zrer9//uoZS3USmJQ 4mHwr6IeCEaUjLe/BhrBsxjz5Q== X-Google-Smtp-Source: AFSGD/U8Jzgwv+Bcm/0I+KzdmlOpTvdbyXBiYapL5R7RxmdAi+gsNj7Q/b2HnmtfHaGIMmmt60IPgg== X-Received: by 2002:a1c:7f0c:: with SMTP id a12mr1790293wmd.89.1545381613189; Fri, 21 Dec 2018 00:40:13 -0800 (PST) Received: from dell ([95.149.164.119]) by smtp.gmail.com with ESMTPSA id x186sm8881966wmg.41.2018.12.21.00.40.12 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Fri, 21 Dec 2018 00:40:12 -0800 (PST) Date: Fri, 21 Dec 2018 08:40:10 +0000 From: Lee Jones To: Priit Laes Cc: Rob Herring , Mark Rutland , Chen-Yu Tsai , Maxime Ripard , Liam Girdwood , Mark Brown , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Olliver Schinagl , linux-sunxi Subject: Re: [PATCH v2 5/8] dt-bindings: mfd: axp20x: Add software based soft_start for AXP209 LDO3 Message-ID: <20181221084010.GR4497@dell> References: <25e67fe9b5397aa5f11bdd7026e4ae6be51dd18b.1544512919.git-series.plaes@plaes.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <25e67fe9b5397aa5f11bdd7026e4ae6be51dd18b.1544512919.git-series.plaes@plaes.org> User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 11 Dec 2018, Priit Laes wrote: > From: Olliver Schinagl > > In the past, there have been words on various lists that if LDO3 is > disabled in u-boot, but enabled in the DTS, the axp209 driver would > fail to continue/hang. Several enable/disable patches have been > issues to devicetree's in both the kernel and u-boot to address > this issue. > > What really happened however, was that the AXP209 shuts down without > a notice and without setting an interrupt. This is caused when LDO3 > gets overloaded, for example with large capacitors on the LDO3 output. > > Normally, we would expect that AXP209 would source 200 mA as per > datasheet and set and trigger an interrupt when being overloaded. > For some reason however, this does not happen. > > As a work-around, implement software-based 'regulator-soft-start' > property for AXP209 LDO3 regulator, which is used to first bring up > the LDO3 to the lowest possible voltage and then enable the LDO. > > After that, we can set the requested voltage as usual. > > Combining this setting with the regulator-ramp-delay allows LDO3 to > come up slowly and staggered, potentially reducing overall inrush current. > > Signed-off-by: Olliver Schinagl > Signed-off-by: Priit Laes > --- > Documentation/devicetree/bindings/mfd/axp20x.txt | 3 +++ > 1 file changed, 3 insertions(+) For my own reference: Acked-for-MFD-by: Lee Jones -- Lee Jones [李琼斯] Linaro Services Technical Lead Linaro.org │ Open source software for ARM SoCs Follow Linaro: Facebook | Twitter | Blog