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

From: [email-masked] (Chanwoo Choi)
Date: Tue, 24 Feb 2015 20:04:17 +0900

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