From mboxrd@z Thu Jan 1 00:00:00 1970 From: ezequiel.garcia@free-electrons.com (Ezequiel Garcia) Date: Fri, 29 Mar 2013 15:13:21 -0300 Subject: [PATCH] ARM: mvebu: Add gpio button to Mirabox board In-Reply-To: References: <20130328033807.GA12212@localhost> <20130329165021.GA17433@localhost> Message-ID: <20130329181319.GA2451@localhost> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Fri, Mar 29, 2013 at 10:30:14AM -0700, Ryan Press wrote: > On Fri, Mar 29, 2013 at 9:50 AM, Ezequiel Garcia > wrote: > > On Thu, Mar 28, 2013 at 09:13:48PM -0700, Ryan Press wrote: > >> On Wed, Mar 27, 2013 at 8:38 PM, Ezequiel Garcia > >> wrote: > >> > On Wed, Mar 27, 2013 at 05:42:36PM -0700, Ryan Press wrote: > >> >> Ezequiel Garcia wrote: > >> >> > > >> >> >The Globalscale Mirabox board has a little gpio button > >> >> >placed just above the SD card slot; the board user guide labels > >> >> >this button as "System reset button". > >> >> > > >> >> >This patch adds support for this button in the device tree file. > >> >> I was not able to get this to work, I think there is > >> >> some IRQ problem. I was able to get it to work with > >> >> "gpio-keys-polled" however. > >> >> > >> > > >> > Could you explain what you did and what was your problem? > >> > >> Just to be on the same page, I pulled the latest 3-9-rc4, with no > >> other changes, and then added your patch. Does this rely on a patch? > >> No interrupt events are shown in /proc/interrupts. I have a lot more > >> things running than your box, maybe there is a conflict. > >> > > > > Try disabling SMP in your config. > > Yes, that worked, thanks! I used mvebu_defconfig initially, and this > has CONFIG_SMP. That's more for the Armada-XP I guess as for the > Armada-370 it's not needed. > Great. > So I guess that means that there's something wrong with the GPIO IRQs > with SMP. Anyway it doesn't matter for the 370. > Indeed, it doesn't matter if you plan to use your kernel only in a A370 SoC based product (A370 is single core). However, I'm afraid this could be a problem if you plan to use the same kernel on A370 *and* AXP (multi core) SoCs. Next week, we'll try to debug this issue (I've added Thomas, Gregory and Lior in Cc who might have better understanding about this). Thanks, -- Ezequiel Garc?a, Free Electrons Embedded Linux, Kernel and Android Engineering http://free-electrons.com