From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Thu, 2 Nov 2017 16:50:03 +0100 Subject: [linux-sunxi] Re: [PATCH] ARM: sun8i: h2+: add support for Banana Pi M2 Zero board In-Reply-To: <8327eaeaa12b99f9962a53c9f02ddd6d@aosc.io> References: <20171101093814.19177-1-icenowy@aosc.io> <20171102090248.wnvj7dpphn5uqsut@flea> <8327eaeaa12b99f9962a53c9f02ddd6d@aosc.io> Message-ID: <20171102155003.vp7uve4ypyn4sb6j@flea> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Thu, Nov 02, 2017 at 05:07:30PM +0800, Icenowy Zheng wrote: > > > +&mmc0 { > > > + pinctrl-names = "default"; > > > + pinctrl-0 = <&mmc0_pins_a>; > > > + vmmc-supply = <®_vcc3v3>; > > > + bus-width = <4>; > > > + /* > > > + * In different revisions the board have different card detect > > > + * configuration. > > > + */ > > > > Which ones? > > In the sample batch (1.2V fixed voltage) the card detect is normal > (PF6 low as inserted), however in the final batch (1.1V/1.3V > switchable) it's inverted at PF6 (high as inserted). Then just use the final version's. > > > +&usbphy { > > > + usb0_id_det-gpios = <&r_pio 0 6 GPIO_ACTIVE_HIGH>; /* PL6 */ > > > + /* USB OTG VBUS is directly connected to 5V without any regulators > > > */ > > > > So it cannot operate in OTG, but it's host only? > > It can operate in OTG -- you can power the board via the OTG port, > as the VBUS is not gated from 5V at all, so 5V power at VBUS will > power up the board. Yes, it's a bit unsafe, but the board designer > did it. What will provide the 5v in the first place then if a USB device is connected to the micro-USB connector? Maxime -- Maxime Ripard, Free Electrons Embedded Linux and Kernel engineering http://free-electrons.com -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 801 bytes Desc: not available URL: