linux-kernel - Re: [PATCH v2 0/3] ARM: dts: meson: add the APB/APB2 busses

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Date:   Tue, 11 Dec 2018 23:09:30 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     linux-amlogic@...ts.infradead.org, khilman@...libre.com,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 0/3] ARM: dts: meson: add the APB/APB2 busses

Hi Neil,

On Tue, Dec 11, 2018 at 10:16 AM Neil Armstrong <narmstrong@...libre.com> wrote:
>
> On 08/12/2018 17:50, Martin Blumenstingl wrote:
> > This adds the APB bus on Meson8 and Meson8b as well as the APB2 bus on
> > Meson6. This is preparation work for adding the Mali GPU which is
> > located on theses busses.
> >
> > Meson6 seems to have it's APB at 0xc8000000 instead of 0xd0000000. The
> > region at 0xd0000000 is called APB2 or A9_APB and it has a different
> > size (256k) compared to Meson8 and Meson8b (2M).
> >
> > Addresses and sizes are taken from the Amlogic 3.10 kernel sources:
> > - Meson6: [0]
> > - Meson8: [1]
> > - Meson8b: [2]
> >
> >
> > Changes since v1 at [3]:
> > - re-send the patches but this time don't include the old patches
> >   which still had a typo in the patch description (ABP vs APB)
> >
> >
> > [0] https://github.com/endlessm/linux-meson/blob/cd4096c3ff4eb5b8a8a5581bb46508601c5470dc/arch/arm/mach-meson6/include/mach/io.h#L61
> > [1] https://github.com/endlessm/linux-meson/blob/cd4096c3ff4eb5b8a8a5581bb46508601c5470dc/arch/arm/mach-meson8/include/mach/io.h#L53
> > [2] https://github.com/endlessm/linux-meson/blob/cd4096c3ff4eb5b8a8a5581bb46508601c5470dc/arch/arm/mach-meson8b/include/mach/io.h#L53
> > [3] http://lists.infradead.org/pipermail/linux-amlogic/2018-December/009424.html
> >
> >
> > Martin Blumenstingl (3):
> >   ARM: dts: meson6: add the APB2 bus
> >   ARM: dts: meson8: add the APB bus
> >   ARM: dts: meson8b: add the APB bus
> >
> >  arch/arm/boot/dts/meson6.dtsi  | 8 ++++++++
> >  arch/arm/boot/dts/meson8.dtsi  | 8 ++++++++
> >  arch/arm/boot/dts/meson8b.dtsi | 8 ++++++++
> >  3 files changed, 24 insertions(+)
> >
>
> Reviewed-by: Neil Armstrong <narmstrong@...libre.com>
thank you for taking the time to review this!

> But frankly I'll squash the meson8/meson8b patches with the mali node patches !
I didn't do this because I realized that there are different busses
between Meson6 and Meson8/Meson8b. so I wanted to have a commit
message which describes this.
if you prefer I can still squash the Meson8 and Meson8b patches into
their corresponding GPU .dts patch but I would like to keep the Meson6
patch (as I'm not planning to add the Mali GPU until someone can
actually test it on that SoC)


Regards
Martin