From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chanwoo Choi Subject: Re: [PATCH v4 2/8] arm64: dts: exynos: Add dts files for 64-bit Exynos5433 SoC Date: Thu, 26 Feb 2015 17:42:38 +0900 Message-ID: <54EEDC7E.9010406@samsung.com> References: <1424755011-15999-1-git-send-email-cw00.choi@samsung.com> <7412525.l6YnQcTxtg@wuerfel> <54EC5AB1.5090802@samsung.com> <6850624.bdB2Ab6zJx@wuerfel> <54EED6E1.4060908@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: In-reply-to: <54EED6E1.4060908@samsung.com> Sender: linux-kernel-owner@vger.kernel.org To: Arnd Bergmann Cc: Chanwoo Choi , linux-arm-kernel@lists.infradead.org, mark.rutland@arm.com, jh80.chung@samsung.com, linux-samsung-soc@vger.kernel.org, devicetree@vger.kernel.org, marc.zyngier@arm.com, catalin.marinas@arm.com, will.deacon@arm.com, linux-kernel@vger.kernel.org, a.kesavan@samsung.com, inki.dae@samsung.com, sw0312.kim@samsung.com, kgene@kernel.org, olof@lixom.net, chanho61.park@samsung.com, ideal.song@samsung.com List-Id: devicetree@vger.kernel.org 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@localhost:~# 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