linux-kernel - Re: [v2 00/10] arm/arm64: mediatek: Fix mmsys device probing

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Date:   Tue, 24 Apr 2018 11:46:13 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Lee Jones <lee.jones@...aro.org>, matthias.bgg@...nel.org
Cc:     ulrich.hecht+renesas@...il.com, laurent.pinchart@...asonboard.com,
        ck.hu@...iatek.com, p.zabel@...gutronix.de, airlied@...ux.ie,
        robh+dt@...nel.org, mark.rutland@....com, mturquette@...libre.com,
        sboyd@...eaurora.org, davem@...emloft.net,
        gregkh@...uxfoundation.org, mchehab@...nel.org,
        rdunlap@...radead.org, pi-cheng.chen@...aro.org,
        sean.wang@...iatek.com, linux-clk@...r.kernel.org,
        linux@...linux.org.uk, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Matthias Brugger <mbrugger@...e.com>
Subject: Re: [v2 00/10] arm/arm64: mediatek: Fix mmsys device probing

Hi Lee,

On 04/24/2018 07:48 AM, Lee Jones wrote:
> On Mon, 23 Apr 2018, matthias.bgg@...nel.org wrote:
> 
>> From: Matthias Brugger <mbrugger@...e.com>
>>
>> Changes since v1:
>> - add binding documentation
>> - ddp: use regmap_update_bits
>> - ddp: ignore EPROBE_DEFER on clock probing
>> - mfd: delete mmsys_private
>> - add Reviewed-by and Acked-by tags
> 
> I'm confused by the double submission.
> 
> Please can you send it again completely detached from the first and
> the second submissions please?
> 

I had some problems with my mailclient. I'll resend as 'v2 resend'.

Sorry for that.
Matthias

>> ---
>>
>> MMSYS in Mediatek SoCs has some registers to control clock gates (which is 
>> used in the clk driver) and some registers to set the routing and enable
>> the differnet blocks of the display subsystem.
>>
>> Up to now both drivers, clock and drm are probed with the same device tree
>> compatible. But only the first driver get probed, which in effect breaks
>> graphics on mt8173 and mt2701.
>>
>> This patch set introduces a new mfd device, which binds against the mmsys
>> compatible and takes care of probing the needed devices. It was tested on the
>> bananapi-r2 and the Acer R13 Chromebook.
>>
>>
>> Matthias Brugger (10):
>>   dt-bindings: mediatek: mmsys: Add support for mfd
>>   drm/mediatek: Use regmap for register access
>>   mfd: mtk-mmsys: Add mmsys driver
>>   drm/mediatek: mt2701: switch to mfd probing.
>>   clk: mediatek: mt2701-mm: switch to mfd device
>>   mfd: mtk-mmsys: Add mt8173 nodes
>>   drm/mediatek: Add mfd support for mt8173
>>   clk: mediatek: mt8173-mm: switch to mfd device
>>   drm: mediatek: Omit warning on probe defers
>>   MAINTAINERS: update Mediatek Soc entry
>>
>>  .../bindings/arm/mediatek/mediatek,mmsys.txt       |  2 -
>>  .../bindings/display/mediatek/mediatek,disp.txt    |  2 +-
>>  .../devicetree/bindings/mfd/mediatek,mmsys.txt     | 27 +++++++
>>  MAINTAINERS                                        |  2 +
>>  drivers/clk/mediatek/clk-mt2701-mm.c               | 10 +--
>>  drivers/clk/mediatek/clk-mt8173.c                  | 17 +++-
>>  drivers/gpu/drm/mediatek/mtk_drm_crtc.c            |  4 +-
>>  drivers/gpu/drm/mediatek/mtk_drm_ddp.c             | 41 ++++------
>>  drivers/gpu/drm/mediatek/mtk_drm_ddp.h             |  4 +-
>>  drivers/gpu/drm/mediatek/mtk_drm_drv.c             | 33 ++++----
>>  drivers/gpu/drm/mediatek/mtk_drm_drv.h             |  2 +-
>>  drivers/mfd/Kconfig                                |  9 +++
>>  drivers/mfd/Makefile                               |  2 +
>>  drivers/mfd/mtk-mmsys.c                            | 93 ++++++++++++++++++++++
>>  14 files changed, 189 insertions(+), 59 deletions(-)
>>  create mode 100644 Documentation/devicetree/bindings/mfd/mediatek,mmsys.txt
>>  create mode 100644 drivers/mfd/mtk-mmsys.c
>>
>