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From: Arnd Bergmann <arnd@arndb.de>
To: linux-arm-kernel@lists.infradead.org
Cc: "zhichang.yuan" <yuanzhichang@hisilicon.com>,
	zhichang <zhichang.yuan02@gmail.com>,
	lorenzo.pieralisi@arm.com, gabriele.paoloni@huawei.com,
	minyard@acm.org, benh@kernel.crashing.org, john.garry@huawei.com,
	liviu.dudau@arm.com, linuxarm@huawei.com,
	linux-kernel@vger.kernel.org, zourongrong@gmail.com
Subject: Re: [PATCH V2 3/4] ARM64 LPC: support serial based on low-pin-count
Date: Wed, 14 Sep 2016 14:07:22 +0200	[thread overview]
Message-ID: <13406676.rztgqQLiFa@wuerfel> (raw)
In-Reply-To: <57D93921.50303@hisilicon.com>

On Wednesday, September 14, 2016 7:48:49 PM CEST zhichang.yuan wrote:
> On 2016/9/8 17:58, Arnd Bergmann wrote:
> > On Thursday, September 8, 2016 5:51:25 PM CEST zhichang wrote:
> >> On 2016年09月07日 22:50, Arnd Bergmann wrote:
> >>> On Wednesday, September 7, 2016 9:33:52 PM CEST Zhichang Yuan wrote:
> >>>> From: "zhichang.yuan" <yuanzhichang@hisilicon.com>
> >>>>
> >>>> On Hip06 platform, a 16550 compatible UART is connected to low-pin-count and
> >>>> controlled through the LPC I/O cycles. This patch drives the UART port with
> >>>> the specific serial in/out function pair based on the indirect-IO mechanism
> >>>> introduced by Hip06 LPC driver.
> >>>>
> >>>> Signed-off-by: zhichang.yuan <yuanzhichang@hisilicon.com>
> >>>
> >>> Any reason this cannot just use the regular drivers/tty/serial/8250/8250_of.c
> >>> driver?
> >> I think two reasons for that:
> >> 1. 8250_of.c is only for devicetree, but we need to support ACPI device too;
> > 
> > ACPI has its own way of describing serial ports, use that instead.
> Could you give me some info about ACPI serial ports?
> I found there is _CRS specific for serial, but it seems no serial driver use that.

drivers/tty/serial/8250/8250_dw.c is a driver that uses ACPI matching,
and possibly drivers/tty/serial/8250/8250_pnp.c could work as well.

	Arnd

  reply	other threads:[~2016-09-14 12:08 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-09-07 13:33 [PATCH V2 0/4] ARM64 LPC: legacy ISA I/O support Zhichang Yuan
2016-09-07 13:33 ` [PATCH V2 1/4] ARM64 LPC: Indirect ISA port IO introduced Zhichang Yuan
2016-09-07 15:06   ` Arnd Bergmann
2016-09-08  7:45     ` zhichang.yuan
2016-09-08 13:23       ` Arnd Bergmann
2016-09-13  6:08         ` zhichang
2016-09-07 15:21   ` kbuild test robot
2016-09-07 13:33 ` [PATCH V2 2/4] ARM64 LPC: LPC driver implementation on Hip06 Zhichang Yuan
2016-09-07 15:27   ` Arnd Bergmann
2016-09-08  8:06     ` zhichang.yuan
2016-09-08 10:00       ` Arnd Bergmann
2016-09-13  6:31         ` zhichang
2016-09-14 12:34           ` Arnd Bergmann
2016-09-07 17:51   ` kbuild test robot
2016-09-07 13:33 ` [PATCH V2 3/4] ARM64 LPC: support serial based on low-pin-count Zhichang Yuan
2016-09-07 14:50   ` Arnd Bergmann
2016-09-08  9:51     ` zhichang
2016-09-08  9:58       ` Arnd Bergmann
2016-09-14 11:48         ` zhichang.yuan
2016-09-14 12:07           ` Arnd Bergmann [this message]
2016-09-07 13:33 ` [PATCH V2 4/4] ARM64 LPC: support earlycon for UART connected to LPC Zhichang Yuan
2016-09-07 14:52   ` Arnd Bergmann
2016-09-08 10:04     ` zhichang
2016-09-08 11:04       ` Arnd Bergmann
2016-09-14 11:26         ` zhichang
2016-09-14 12:36           ` Arnd Bergmann
2016-09-08  9:26   ` kbuild test robot

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