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

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Message-id: <54EEDC7E.9010406@samsung.com>
Date:	Thu, 26 Feb 2015 17:42:38 +0900
From:	Chanwoo Choi <cw00.choi@...sung.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Chanwoo Choi <cw00.choi@...sung.com>,
	linux-arm-kernel@...ts.infradead.org, mark.rutland@....com,
	jh80.chung@...sung.com, linux-samsung-soc@...r.kernel.org,
	devicetree@...r.kernel.org, marc.zyngier@....com,
	catalin.marinas@....com, will.deacon@....com,
	linux-kernel@...r.kernel.org, a.kesavan@...sung.com,
	inki.dae@...sung.com, sw0312.kim@...sung.com, kgene@...nel.org,
	olof@...om.net, chanho61.park@...sung.com, ideal.song@...sung.com
Subject: Re: [PATCH v4 2/8] arm64: dts: exynos: Add dts files for 64-bit
 Exynos5433 SoC

Hi Arnd,

On 02/26/2015 05:18 PM, Chanwoo Choi wrote:
> On 02/24/2015 08:59 PM, Arnd Bergmann wrote:
>> On Tuesday 24 February 2015 20:04:17 Chanwoo Choi wrote:
>>> 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  
>>>
>>

[snip]

> 
> So, I change the kernel command line about ('console' bootparam) as following:
> because tty framework must use the 'console' bootparam to print kernel log.

I fix the my wrong expression. Some tty driver use the 'console' bootparam.

[snip]

Thanks,
Chanwoo Choi

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