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Message-ID: <6773745.i9mx5zmPP4@wuerfel> Date: Tue, 10 Mar 2015 21:19:55 +0100 From: Arnd Bergmann <arnd@...db.de> To: Maxime Coquelin <mcoquelin.stm32@...il.com> Cc: maxime.ripard@...e-electrons.com, Uwe Kleine-König <u.kleine-koenig@...gutronix.de>, Andreas Färber <afaerber@...e.de>, Geert Uytterhoeven <geert@...ux-m68k.org>, Rob Herring <robh+dt@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>, Jonathan Corbet <corbet@....net>, Pawel Moll <pawel.moll@....com>, Mark Rutland <mark.rutland@....com>, Ian Campbell <ijc+devicetree@...lion.org.uk>, Kumar Gala <galak@...eaurora.org>, Russell King <linux@....linux.org.uk>, Daniel Lezcano <daniel.lezcano@...aro.org>, Thomas Gleixner <tglx@...utronix.de>, Linus Walleij <linus.walleij@...aro.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Jiri Slaby <jslaby@...e.cz>, Andrew Morton <akpm@...ux-foundation.org>, "David S. Miller" <davem@...emloft.net>, Mauro Carvalho Chehab <mchehab@....samsung.com>, Joe Perches <joe@...ches.com>, Antti Palosaari <crope@....fi>, Tejun Heo <tj@...nel.org>, Will Deacon <will.deacon@....com>, Nikolay Borisov <Nikolay.Borisov@....com>, Rusty Russell <rusty@...tcorp.com.au>, Kees Cook <keescook@...omium.org>, Michal Marek <mmarek@...e.cz>, "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>, "linux-arm-kernel@...ts.infradead.org" <linux-arm-kernel@...ts.infradead.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>, "linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>, "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>, Linux-Arch <linux-arch@...r.kernel.org>, "linux-api@...r.kernel.org" <linux-api@...r.kernel.org> Subject: Re: [PATCH v2 05/18] reset: Add reset_controller_of_init() function On Tuesday 10 March 2015 16:28:44 Maxime Coquelin wrote: > 2015-03-10 16:00 GMT+01:00 Arnd Bergmann <arnd@...db.de>: > > On Friday 20 February 2015 19:01:04 Maxime Coquelin wrote: > >> Some platforms need to initialize the reset controller before the timers. > >> > >> This patch introduces a reset_controller_of_init() function that can be > >> called before the timers intialization. > >> > >> Signed-off-by: Maxime Coquelin <mcoquelin.stm32@...il.com> > >> > > > > Not sure about this. It seems like the cleanest approach if we get > > a lot of these, but then again it is probably very rare, and I'd > > like to avoid adding such infrastructure if it's just for one > > SoC. Could we add a hack in the machine initialization instead? > > Sun6i also need to initialize the reset controller early. Today, they > hack the machine initialization. > With two SoCs having the same need, what should we do? Good question, I'd like to hear some other opinions on this first. > > I think ideally this would be done in the boot loader before we > > even start Linux, but I don't know if that's possible for you. > > From what I understand, the only constraint is to perform it after the > clock is enabled. > So this should be possible to do it in the bootloader, but it means > also adding timers clocks ungating in the bootloader. Ungating the timer clock input seems like a reasonable thing to do for the bootloader, I think a lot of platforms rely on this elsewhere (but enough of them don't, which is why we have the early clk init). Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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