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

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Message-id: <54EC5AB1.5090802@samsung.com>
Date:	Tue, 24 Feb 2015 20:04:17 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	kgene@...nel.org, mark.rutland@....com, marc.zyngier@....com,
	olof@...om.net, catalin.marinas@....com, will.deacon@....com,
	inki.dae@...sung.com, chanho61.park@...sung.com,
	sw0312.kim@...sung.com, jh80.chung@...sung.com,
	ideal.song@...sung.com, a.kesavan@...sung.com,
	devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 2/8] arm64: dts: exynos: Add dts files for 64-bit
 Exynos5433 SoC

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@...alhost:~# ls /dev/ttySAC
	ttySAC1  ttySAC3  

Thanks,
Chanwoo Choi


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