From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from muru.com ([72.249.23.125]:58960 "EHLO muru.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726440AbfH1Pex (ORCPT ); Wed, 28 Aug 2019 11:34:53 -0400 Date: Wed, 28 Aug 2019 08:34:48 -0700 From: Tony Lindgren Subject: Re: [PATCH] ARM: dts: omap4-droid4: Allow 350mA current for USB peripherals Message-ID: <20190828153448.GC52127@atomide.com> References: <20190828151706.32643-1-tony@atomide.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190828151706.32643-1-tony@atomide.com> Sender: devicetree-owner@vger.kernel.org To: linux-omap@vger.kernel.org Cc: =?utf-8?Q?Beno=C3=AEt?= Cousson , devicetree@vger.kernel.org, Jacopo Mondi , Marcel Partap , Merlijn Wajer , Michael Scott , NeKit , Pavel Machek , Sebastian Reichel List-ID: * Tony Lindgren [190828 08:17]: > Looks like we can use some USB Ethernet dongles for example if we increase > the allowed power limit. > > A similar PMIC MC13783 documents maximum current limit as 350 mA in in > "Table 10-3. VUSB Regulator Main Characteristics". Since we have no > other documentation, let's use that value as the limit. Oops, that's too much, it's not VUSB regulator but VBUS regulator that lists 300 mA max instead of 350 mA for VUSB regulator. Updated patch below. Regards, Tony 8< ------------------------ >>From tony Mon Sep 17 00:00:00 2001 From: Tony Lindgren Date: Wed, 28 Aug 2019 08:11:26 -0700 Subject: [PATCH] ARM: dts: omap4-droid4: Allow 300mA current for USB peripherals Looks like we can use some USB Ethernet dongles for example if we increase the allowed power limit. A similar PMIC MC13783 documents maximum current limit as 300 mA in in "Table 10-4. VBUS Regulator Main Characteristics". Since we have no other documentation, let's use that value as the limit. Cc: Jacopo Mondi Cc: Marcel Partap Cc: Merlijn Wajer Cc: Michael Scott Cc: NeKit Cc: Pavel Machek Cc: Sebastian Reichel Signed-off-by: Tony Lindgren --- arch/arm/boot/dts/omap4-droid4-xt894.dts | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/arch/arm/boot/dts/omap4-droid4-xt894.dts b/arch/arm/boot/dts/omap4-droid4-xt894.dts --- a/arch/arm/boot/dts/omap4-droid4-xt894.dts +++ b/arch/arm/boot/dts/omap4-droid4-xt894.dts @@ -781,7 +781,12 @@ &usb_otg_hs { interface-type = <1>; mode = <3>; - power = <50>; + + /* + * Max 300 mA steps based on similar PMIC MC13783UG.pdf "Table 10-4. + * VBUS Regulator Main Characteristics". Binding uses 2 mA units. + */ + power = <150>; }; &i2c4 { -- 2.23.0