From: Arnd Bergmann <arnd@arndb.de>
To: zhichang <zhichang.yuan02@gmail.com>
Cc: linux-arm-kernel@lists.infradead.org,
Zhichang Yuan <yuanzhichang@hisilicon.com>,
linuxarm@huawei.com, linux-kernel@vger.kernel.org,
lorenzo.pieralisi@arm.com, minyard@acm.org,
benh@kernel.crashing.org, gabriele.paoloni@huawei.com,
john.garry@huawei.com, liviu.dudau@arm.com,
zourongrong@gmail.com
Subject: Re: [PATCH V2 3/4] ARM64 LPC: support serial based on low-pin-count
Date: Thu, 08 Sep 2016 11:58:08 +0200 [thread overview]
Message-ID: <2531252.L41vzyMSKX@wuerfel> (raw)
In-Reply-To: <57D1349D.8070905@gmail.com>
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.
> 2. It seems UPIO_PORT is not supported there.
Should be easy enough to add.
Arnd
next prev parent reply other threads:[~2016-09-08 9:58 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 [this message]
2016-09-14 11:48 ` zhichang.yuan
2016-09-14 12:07 ` Arnd Bergmann
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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