linux-kernel - Re: [PATCH 19/22] ARM: sunxi: Add earlyprintk support using R

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Date:	Tue, 27 May 2014 10:34:50 +0200
From:	Maxime Ripard <maxime.ripard@...e-electrons.com>
To:	Chen-Yu Tsai <wens@...e.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	Lee Jones <lee.jones@...aro.org>,
	Rob Herring <robh+dt@...nel.org>,
	Mike Turquette <mturquette@...aro.org>,
	Emilio Lopez <emilio@...pez.com.ar>,
	Linus Walleij <linus.walleij@...aro.org>,
	linux-serial@...r.kernel.org,
	linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
	devicetree <devicetree@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Hans de Goede <hdegoede@...hat.com>,
	Boris BREZILLON <boris.brezillon@...e-electrons.com>,
	Luc Verhaegen <libv@...net.be>
Subject: Re: [PATCH 19/22] ARM: sunxi: Add earlyprintk support using R_UART
 (sun6i/sun8i)

On Mon, May 26, 2014 at 05:25:43PM +0800, Chen-Yu Tsai wrote:
> On Mon, May 26, 2014 at 2:46 AM, Maxime Ripard
> <maxime.ripard@...e-electrons.com> wrote:
> > Hi,
> >
> > On Fri, May 23, 2014 at 03:51:22PM +0800, Chen-Yu Tsai wrote:
> >> sun6i/sun8i have a UART in the RTC block group, which can be used
> >> as an early console. This is most useful on sun8i as UART0 is muxed
> >> with MMC0, which is not available if we boot from MMC.
> >>
> >> Signed-off-by: Chen-Yu Tsai <wens@...e.org>
> >> ---
> >>  arch/arm/Kconfig.debug | 10 ++++++++++
> >>  1 file changed, 10 insertions(+)
> >>
> >> diff --git a/arch/arm/Kconfig.debug b/arch/arm/Kconfig.debug
> >> index eab8ecb..9e22708 100644
> >> --- a/arch/arm/Kconfig.debug
> >> +++ b/arch/arm/Kconfig.debug
> >> @@ -694,6 +694,14 @@ choice
> >>                 Say Y here if you want kernel low-level debugging support
> >>                 on Allwinner A1X based platforms on the UART1.
> >>
> >> +     config DEBUG_SUNXI_R_UART
> >> +             bool "Kernel low-level debugging messages via sunXi R_UART"
> >> +             depends on ARCH_SUNXI
> >
> > It should rather depend on MACH_SUN8I.
> 
> I assume no sun6i devices would use it, or have pads available for
> it?  If so, then MACH_SUN8I makes sense.

Then a depends on MACH_SUN6I || MACH_SUN8I.

Maxime

-- 
Maxime Ripard, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

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