linux-kernel - Re: [RFC 3/4] MIPS: Ingenic: Initial X1000 SoC support

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Date:   Wed, 7 Mar 2018 20:35:00 +0530
From:   PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
To:     James Hogan <jhogan@...nel.org>
Cc:     Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        Michael Turquette <mturquette@...libre.com>,
        sboyd@...eaurora.org,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>,
        Linux-MIPS <linux-mips@...ux-mips.org>,
        linux-clk@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>,
        Paul Cercueil <paul@...pouillou.net>,
        Mathieu Malaterre <malat@...ian.org>,
        Dominik Peklo <dom.peklo@...il.com>
Subject: Re: [RFC 3/4] MIPS: Ingenic: Initial X1000 SoC support

Hi James,

On 7 March 2018 at 20:05, James Hogan <jhogan@...nel.org> wrote:
> On Wed, Mar 07, 2018 at 07:14:49PM +0530, PrasannaKumar Muralidharan wrote:
>> > Does X1000 use a different PRID, or is it basically just a JZ4780 core
>> > with different SoC peripherals?
>>
>> Yes X1000 does have a different PRID (PRID = 0x2ed1024f). X1000 has
>
> Right, so thats 0x2e000000 | PRID_COMP_INGENIC_D1 | PRID_IMP_JZRISC |
> 0x4f, which cpu-probe.c already handles (apparently the D1 company code
> is used for JZ4770 & JZ4775 too).

Okay. Does this mean I need not modify get_board_mach_type() and
get_system_type()?

>> I used to get my code tested from Domink but I could not reach him for
>> quite some time. Before buying the development board myself I would
>> like to see if anyone can help me in testing. Do you have any contact
>> with Ingenic who can help in testing this?
>
> Not personally, but I'll ask around. Of course if nobody much cares
> about it in practice and nobody has the hardware, there may be little
> value in supporting it upstream.

Seems Jiaxun is interested in the board and is willing to help.

I have been told that Ingenic is focusing on IoT market and X1000 is
intended for IoT segment. I think that they would be selling several
100Ks of chip over the coming years. But I feel Ingenic spends time
only on maintaining their Linux port which is usually based on very
old kernel version.

> Cheers
> James

Thanks and regards,
PrasannaKumar