From mboxrd@z Thu Jan 1 00:00:00 1970 From: afaerber@suse.de (=?UTF-8?Q?Andreas_F=c3=a4rber?=) Date: Mon, 8 May 2017 13:47:19 +0200 Subject: S805/S812 Device Tree upstreaming (was: Testing.) In-Reply-To: References: Message-ID: <26a939cb-ae9c-36ec-fbc7-8735c3826862@suse.de> To: linus-amlogic@lists.infradead.org List-Id: linus-amlogic.lists.infradead.org Hi, Am 08.05.2017 um 11:42 schrieb Oleg: >> I had a quick look at the .dts files - on my Akaso M8S GPIOZ_1 is not >> connected anywhere (at least toggling the GPIO doesn't change anything >> in terms of USB VBUS signal). >> however, your board has: gpio-vbus-power = "GPIOZ_1"; >> it's very likely that the GL852 hub is powered off by default and is >> powered on by enabling GPIOZ_1 >> but since my .dts is not enabling GPIOZ_1 the hub stays powered off >> and USB is not working for you >> (in other words: this will require additional changes in the .dts to >> make it work) > I found dtb to kernel 3.14 the string > > gpio-vbus-power = "GPIOZ_1"; > > You can simply copy it to the unit or it needs to change according to > certain rules ? You need to read the latest bindings documentation, for example: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/devicetree/bindings Regards, Andreas -- SUSE Linux GmbH, Maxfeldstr. 5, 90409 N?rnberg, Germany GF: Felix Imend?rffer, Jane Smithard, Graham Norton HRB 21284 (AG N?rnberg)