From mboxrd@z Thu Jan  1 00:00:00 1970
From: cw00.choi@samsung.com (Chanwoo Choi)
Date: Tue, 24 Feb 2015 20:04:17 +0900
Subject: [PATCH v4 2/8] arm64: dts: exynos: Add dts files for 64-bit
 Exynos5433 SoC
In-Reply-To: <7412525.l6YnQcTxtg@wuerfel>
References: <1424755011-15999-1-git-send-email-cw00.choi@samsung.com>
 <7139111.LGA4lhSjob@wuerfel> <54EC3BB1.1020701@samsung.com>
 <7412525.l6YnQcTxtg@wuerfel>
Message-ID: <54EC5AB1.5090802@samsung.com>
To: linux-arm-kernel@lists.infradead.org
List-Id: linux-arm-kernel.lists.infradead.org

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 at localhost:~# ls /dev/ttySAC
	ttySAC1  ttySAC3  

Thanks,
Chanwoo Choi