On Tuesday 24 February 2015 20:04:17 Chanwoo Choi wrote:

On 02/24/2015 06:48 PM, Arnd Bergmann wrote:

quoted

On Tuesday 24 February 2015 17:52:01 Chanwoo Choi wrote:

quoted

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  

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