linux-kernel - Re: [PATCH v4 2/8] arm64: dts: exynos: Add dts files for 64-bit Exynos5433 SoC

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Date:	Tue, 24 Feb 2015 12:59:06 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Chanwoo Choi <cw00.choi@...sung.com>, mark.rutland@....com,
	jh80.chung@...sung.com, linux-samsung-soc@...r.kernel.org,
	devicetree@...r.kernel.org, marc.zyngier@....com,
	catalin.marinas@....com, will.deacon@....com,
	linux-kernel@...r.kernel.org, a.kesavan@...sung.com,
	inki.dae@...sung.com, sw0312.kim@...sung.com, kgene@...nel.org,
	olof@...om.net, chanho61.park@...sung.com, ideal.song@...sung.com
Subject: Re: [PATCH v4 2/8] arm64: dts: exynos: Add dts files for 64-bit Exynos5433 SoC

On Tuesday 24 February 2015 20:04:17 Chanwoo Choi wrote:
> On 02/24/2015 06:48 PM, Arnd Bergmann wrote:
> > On Tuesday 24 February 2015 17:52:01 Chanwoo Choi wrote:
> >>
> >> But, I have a question.
> >> If we put the aliases into the board dts file instaed of SoC dtsi,
> >> each board dts file may use the different alias name about same phandle.
> > 
> > Yes, that is the idea. In particular with the uarts, the intention is
> > that the numbering of the device nodes in /dev is the same that is
> > printed on the board (if any), which may be different from the numbering
> > internal to the SoC.
> 
> I check the uart device with Exynos5433 SoC based on Linux 4.0-rc1
> If some board use the serial_0 and serial_3 as following in board dtsi,
> 
>         &serial_0 {             --> UART 0 device
>                 status = "okay";
>         };
> 
>         &serial_3 {             --> UART 3 device
>                 status = "okay";
>         };
> 
> The serial core driver create the follwoing /dev/ttySACx device node
> by using the number of alias. It maintain the same device number of internel to the SoC.
> 
>         root@...alhost:~# ls /dev/ttySAC
>         ttySAC1  ttySAC3  
> 

I'm not completely following. So you have set the serial1 alias to
the &serial_0 device node and serial3 to &serial_3?

Why not use serial0=&serial_0 and serial1=&serial_3? Does the serial0
alias have a special meaning?

	Arnd
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