From mboxrd@z Thu Jan 1 00:00:00 1970 From: maxime.ripard@free-electrons.com (Maxime Ripard) Date: Tue, 5 Dec 2017 11:05:11 +0100 Subject: [PATCH] arm64: dts: allwinner: a64: bananapi-m64: Add LED device node In-Reply-To: <20171201162733.23156-1-wens@csie.org> References: <20171201162733.23156-1-wens@csie.org> Message-ID: <20171205100511.ohxcqlrozxfgq6id@flea.lan> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Hi, On Sat, Dec 02, 2017 at 12:27:33AM +0800, Chen-Yu Tsai wrote: > The Bananapi-M64 has 3 LEDS in red, green, and blue. These are toggled > via GPIO lines, which drive transistors that control current across the > LEDS. The red LED is by default on, via an additional pull-up on the > control line. We consider this means that it is a power indicator. > So we set the "default-on" property for it. > > The pingroups the GPIO lines belong to require external regulators be > enabled to be able to drive the GPIO high. These regulators also have > other purposes. However the pin controller does not have bindings for > regulators. Here we just set them to always-on. I guess we should take the opportunity to do just that. We have been deferring this for quite some time now, this is a perfect occasion to do it once and for all :) 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: 833 bytes Desc: not available URL: