linux-kernel - Re: [PATCH 0/15] Add support for OLPC XO 1.75 Embedded Controller

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Message-ID: <40e6a8575d4bdc43cc069e561e12f404983c5567.camel@v3.sk>
Date:   Thu, 11 Oct 2018 12:42:24 +0200
From:   Lubomir Rintel <lkundrak@...sk>
To:     Rob Herring <robh+dt@...nel.org>
Cc:     Mark Brown <broonie@...nel.org>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Darren Hart <dvhart@...radead.org>,
        Andy Shevchenko <andy@...radead.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        James Cameron <quozl@...top.org>,
        Sebastian Reichel <sre@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Eric Miao <eric.y.miao@...il.com>,
        Haojian Zhuang <haojian.zhuang@...il.com>,
        Daniel Mack <daniel@...que.org>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        linux-spi <linux-spi@...r.kernel.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        platform-driver-x86@...r.kernel.org, devel@...verdev.osuosl.org,
        "open list:THERMAL" <linux-pm@...r.kernel.org>
Subject: Re: [PATCH 0/15] Add support for OLPC XO 1.75 Embedded Controller

On Wed, 2018-10-10 at 14:26 -0500, Rob Herring wrote:
> On Wed, Oct 10, 2018 at 12:23 PM Lubomir Rintel <lkundrak@...sk> wrote:
> > Hi.
> > 
> > This patchset adds support for the Embedded Controller on an OLPC XO
> > 1.75 machine. OLPC XO 1.75 is a MMP2 based ARM laptop. It plugs into
> > the existing OLPC platform infrastructure, currently used by the x86
> > based models.
> > 
> > The EC operates in SPI master mode, meaning the SOC is the SPI slave. It
> > uses extra handshake signal to signal readiness of SOC to accept data
> > from EC and to initiate a transaction if SOC wishes to submit data.
> > 
> > The SPI slave support for MMP2 was submitted separately:
> > https://lore.kernel.org/lkml/20181010170936.316862-1-lkundrak@v3.sk/T/#t
> > 
> > THe "power: supply: olpc_battery: correct the temperature" patch was
> > already sent out separately, but I'm including it because the last
> > commit of the set depends on it.
> > 
> > Tested to work on an OLPC XO 1.75 and also tested not to break x86
> > support with an OLPC XO 1 machine. I don't have a XO 1.5, but it's
> > unlikely this breaks it when XO 1 works.
> 
> I asked this on the OLPC devel list recently, but I don't think my
> message ever got past the moderator. Could you generate a DT dump from
> /proc/device-tree of an XO 1 and send to me? I have some DT changes
> planned and need to see if they'd be okay for x86 OLPC.

The /proc/device-tree tarball: http://v3.sk/~lkundrak/olpc/xo1.tar
(Mirror: https://people.freedesktop.org/~lkundrak/olpc/xo1.tar)

My distro's dtc crashes with this (could be related to your recent dtc
fixes), the git tip needs -f to work around some funny property names.
I figure a raw data as opposed to a dts/dtb dump would be a better
idea.

Also, there's no phandles, so it's of rather limited use. If you need
those, then I can share a dump directly from ofw instead or patch the
kernel to fabricate and expose the phandle properties.

This is with the latest firmware. I guess the exact version is
somewhere within the device tree.

> 
> Rob

Cheers
Lubo