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Re: [PATCH] arc: use little endian accesses

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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 ?

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Thread

[PATCH] arc: use little endian accesses Lada Trimasova <Lada.Trimasova@synopsys.com> - 2016-03-09 18:30 +0100
  Re: [PATCH] arc: use little endian accesses Vineet Gupta <Vineet.Gupta1@synopsys.com> - 2016-03-10 06:10 +0100
    Re: [PATCH] arc: use little endian accesses Vineet Gupta <Vineet.Gupta1@synopsys.com> - 2016-03-10 06:30 +0100
    Re: [PATCH] arc: use little endian accesses Arnd Bergmann <arnd@arndb.de> - 2016-03-10 08:50 +0100
      Re: [PATCH] arc: use little endian accesses Vineet Gupta <Vineet.Gupta1@synopsys.com> - 2016-03-11 06:20 +0100
    Re: [PATCH] arc: use little endian accesses Alexey Brodkin <Alexey.Brodkin@synopsys.com> - 2016-03-10 08:50 +0100
      Re: [PATCH] arc: use little endian accesses Vineet Gupta <Vineet.Gupta1@synopsys.com> - 2016-03-10 11:00 +0100
        Re: [PATCH] arc: use little endian accesses Lada Trimasova <Lada.Trimasova@synopsys.com> - 2016-03-10 20:00 +0100
          Re: [PATCH] arc: use little endian accesses Arnd Bergmann <arnd@arndb.de> - 2016-03-10 20:30 +0100
            Re: [PATCH] arc: use little endian accesses Vineet Gupta <Vineet.Gupta1@synopsys.com> - 2016-03-11 13:50 +0100
              Re: [PATCH] arc: use little endian accesses Vineet Gupta <Vineet.Gupta1@synopsys.com> - 2016-03-12 05:30 +0100
          Re: [PATCH] arc: use little endian accesses Noam Camus <noamca@mellanox.com> - 2016-03-11 06:30 +0100

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