Messages in this thread | | | Date | Tue, 24 Feb 2015 20:04:17 +0900 | From | Chanwoo Choi <> | Subject | Re: [PATCH v4 2/8] arm64: dts: exynos: Add dts files for 64-bit Exynos5433 SoC |
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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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