Linux-arch Archive on lore.kernel.org
 help / color / Atom feed
From: Vineet Gupta <Vineet.Gupta1@synopsys.com>
To: Lada Trimasova <Lada.Trimasova@synopsys.com>,
	"linux-snps-arc@lists.infradead.org"
	<linux-snps-arc@lists.infradead.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>,
	Alexey Brodkin <Alexey.Brodkin@synopsys.com>,
	Noam Camus <noamc@ezchip.com>
Subject: Re: [PATCH] arc: use little endian accesses
Date: Thu, 10 Mar 2016 05:19:37 +0000
Message-ID: <C2D7FE5348E1B147BCA15975FBA23075F4E8EE1D@us01wembx1.internal.synopsys.com> (raw)
Message-ID: <20160310051937.l5vcpZHeu-61Ywn4AvIC5YmUu9PVpr67CzKIYyOQdok@z> (raw)
In-Reply-To: <C2D7FE5348E1B147BCA15975FBA23075F4E8EDF9@us01wembx1.internal.synopsys.com>

On Thursday 10 March 2016 10:35 AM, Vineet Gupta wrote:
> +CC Noam
>
> On Wednesday 09 March 2016 10:51 PM, Lada Trimasova wrote:
>> > Memory access primitives should use cpu_to_le16, cpu_to_le32, le16_to_cpu
>> > and le32_to_cpu because it is not really guaranteed that drivers handles
>> > any ordering themselves.
> That is the driver issue. readxx as API simply returns data in native endianness.
> We've had EZChip running big endian and so far and they didn't need this change.
>
>> > For example, serial port driver doesn't work when kernel is build for
>> > arc big endian architecture.
> Last I tested Big Endian on SDP with 8250 part + 8250 driver it was working fine.
> I presume this is the systemC model for device and standard 8250 driver and very
> likely the model is not fixed endian or something.
>
> Alexey knows about this stuff - this was discussed on lkml back in 2013 when he
> was fighting the Xilinx systemAce driver endian issues
>

Do you need "native-endian" DT entry in nsimosci DT bindings for uart ?

  reply index

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-09 17:21 Lada Trimasova
2016-03-10  5:05 ` Vineet Gupta
2016-03-10  5:19   ` Vineet Gupta [this message]
2016-03-10  5:19     ` Vineet Gupta
2016-03-10  7:44   ` Alexey Brodkin
2016-03-10  9:55     ` Vineet Gupta
2016-03-10 18:57       ` Lada Trimasova
2016-03-10 18:57         ` Lada Trimasova
2016-03-10 19:23         ` Arnd Bergmann
2016-03-11 12:44           ` Vineet Gupta
2016-03-12  4:20             ` Vineet Gupta
2016-03-12  4:20               ` Vineet Gupta
2016-03-11  5:07         ` Noam Camus
2016-03-11  5:07           ` Noam Camus
2016-03-10  7:45   ` Arnd Bergmann
2016-03-10  7:45     ` Arnd Bergmann
2016-03-11  5:18     ` Vineet Gupta

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=C2D7FE5348E1B147BCA15975FBA23075F4E8EE1D@us01wembx1.internal.synopsys.com \
    --to=vineet.gupta1@synopsys.com \
    --cc=Alexey.Brodkin@synopsys.com \
    --cc=Lada.Trimasova@synopsys.com \
    --cc=linux-arch@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-snps-arc@lists.infradead.org \
    --cc=noamc@ezchip.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-arch Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-arch/0 linux-arch/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-arch linux-arch/ https://lore.kernel.org/linux-arch \
		linux-arch@vger.kernel.org
	public-inbox-index linux-arch

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-arch


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git