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@localhost:~# ls /dev/ttySAC
ttySAC1 ttySAC3
Thanks,
Chanwoo Choi
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