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

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Message-ID: <20180307151025.GP4197@saruman>
Date:   Wed, 7 Mar 2018 15:10:25 +0000
From:   James Hogan <jhogan@...nel.org>
To:     PrasannaKumar Muralidharan <prasannatsmkumar@...il.com>
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

On Wed, Mar 07, 2018 at 08:35:00PM +0530, PrasannaKumar Muralidharan wrote:
> 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()?

You still need to modify them, otherwise it won't understand
"ingenic,x1000" compatible string, and will call it a JZ4740 in
/proc/cpuinfo.

> >> 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.

Okay, cool.

Cheers
James

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