linux-kernel - Re: [PATCH v4 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and evaluation board dts

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Message-ID: <20150313162516.GA9603@leverpostej>
Date:	Fri, 13 Mar 2015 16:25:16 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Kumar Gala <galak@...eaurora.org>
Cc:	"linux-arm-msm@...r.kernel.org" <linux-arm-msm@...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>,
	"arm@...nel.org" <arm@...nel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"heiko@...ech.de" <heiko@...ech.de>
Subject: Re: [PATCH v4 2/4] arm64: dts: Add Qualcomm MSM8916 SoC and
 evaluation board dts

On Fri, Mar 13, 2015 at 03:50:42PM +0000, Kumar Gala wrote:
> 
> On Mar 13, 2015, at 5:52 AM, Mark Rutland <mark.rutland@....com> wrote:
> 
> >> +/ {
> >> +	chosen {
> >> +		stdout-path = &blsp1_uart2;
> >> +	};
> > 
> > It would be good if we had the configuration too (see
> > Documentation/devicetree/bindings/chosen.txt), as that avoids any
> > reliance on kernel defaults.
> > 
> > You can refer to an alias, so this could be:
> > 
> > aliases {
> > 	serial0 = &blsp1_uart2;
> > };
> > 
> > chosen {
> > 	stdout-path = "serial0:115200n8";
> > };
> > 
> > ...assuming that 115200n8 is correct for your UART, of course.
> > 
> > 
> > […]
> 
> Where is the code that actually handles this parsing?  I’m not see it
> in early_init_dt_scan_chosen_serial and I don’t believe
> fdt_path_offset does anything special with ‘:'

Take a look at commit 7914a7c5651a5161 ("of: support passing console options with
stdout-path").

Early on of_alias_scan will find the options and in of_console_check
we'll call add_preferred_console as appropriate. That'll be called in
uart_add_one_port.

> I’ll kill off usage of skeleton.dtsi

Cheers.

Mark.
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