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Subject: Re: [PATCH v5 0/8] Enable ili9341 and l3gd20 on stm32f429-disco
To:     dillon min <dillon.minfei@gmail.com>
CC:     Rob Herring <robh+dt@kernel.org>, <p.zabel@pengutronix.de>,
        Maxime Coquelin <mcoquelin.stm32@gmail.com>,
        <thierry.reding@gmail.com>, Sam Ravnborg <sam@ravnborg.org>,
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        Daniel Vetter <daniel@ffwll.ch>,
        Michael Turquette <mturquette@baylibre.com>,
        Stephen Boyd <sboyd@kernel.org>,
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        linux-spi <linux-spi@vger.kernel.org>,
        <linux-stm32@st-md-mailman.stormreply.com>,
        "open list:DRM PANEL DRIVERS" <dri-devel@lists.freedesktop.org>,
        linux-clk <linux-clk@vger.kernel.org>
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From:   Alexandre Torgue <alexandre.torgue@st.com>
Message-ID: <112dd65b-2a3c-a776-8d31-f0d0b8f2c355@st.com>
Date:   Tue, 21 Jul 2020 14:58:49 +0200
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On 7/21/20 2:55 PM, dillon min wrote:
> Hi, Alexandre,
> 
> 
> On Tue, Jul 21, 2020 at 7:54 PM Alexandre Torgue
> <alexandre.torgue@st.com> wrote:
>>
>>
>>
>> On 7/21/20 12:39 PM, dillon min wrote:
>>> Hi Alexandre,
>>>
>>> On Tue, Jul 21, 2020 at 5:19 PM Alexandre Torgue
>>> <alexandre.torgue@st.com> wrote:
>>>>
>>>> Hi Dillon
>>>>
>>>> On 5/25/20 5:40 AM, dillon.minfei@gmail.com wrote:
>>>>> From: dillon min <dillon.minfei@gmail.com>
>>>>>
>>>>> V5's update based on Mark Brown's suggestion, use 'SPI_MASTER_MUST_RX'
>>>>> for SPI_SIMPLEX_RX mode on stm32 spi controller.
>>>>>
>>>>> V5:
>>>>> 1 instead of add send dummy data out under SIMPLEX_RX mode,
>>>>>       add flags 'SPI_CONTROLLER_MUST_TX' for stm32 spi driver
>>>>> 2 bypass 'SPI_CONTROLLER_MUST_TX' and 'SPI_CONTROLLER_MUST_RX' under
>>>>> 'SPI_3WIRE' mode
>>>>>
>>>>
>>>> Concerning DT patches, they look goods for me. However I'll merge them
>>>> when drivers parts will be merged.
>>>>
>>>> regards
>>>> Alex
>>> This patchset status is :
>>> dts:
>>>       ARM: dts: stm32: Add dma config for spi5
>>>       ARM: dts: stm32: Add pin map for ltdc & spi5 on stm32f429-disco board
>>>       ARM: dts: stm32: enable ltdc binding with ili9341, gyro l3gd20 on
>>>         stm32429-disco board
>>>
>>> panel-bindings: Reviewed-by: Rob Herring， need more reviewing to merge
>>>       dt-bindings: display: panel: Add ilitek ili9341 panel bindings
>>>
>>> clk: Acked-by: Stephen Boyd , need more reviewing to merge
>>>       clk: stm32: Fix stm32f429's ltdc driver hang in set clock rate,
>>>         fix duplicated ltdc clock register to 'clk_core' case ltdc's clock
>>>           turn off by clk_disable_unused()
>>>
>>> drm-panel:  Reviewed-by: Linus Walleij . need more reviewing to merge
>>>       drm/panel: Add ilitek ili9341 panel driver
>>>
>>> spi-driver: Acked-by: Mark Brown ，merged into mainline
>>>       spi: stm32: Add 'SPI_SIMPLEX_RX', 'SPI_3WIRE_RX' support for stm32f4
>>>       spi: flags 'SPI_CONTROLLER_MUST_RX' and 'SPI_CONTROLLER_MUST_TX' can't
>>>         becoexit with 'SPI_3WIRE' mode
>>>
>>> For ili9341 drivers, it seems to need more time to review, or might be dropped.
>>> since the drm maintainer might create a new interface to support
>>> DPI,DBI,DSI in one driver.
>>> Currently it's under discussion. I will rework the ili9341 driver after that.
>>>
>>> But, we can use the existing "drivers/gpu/drm/tiny/ili9341.c" driver to support
>>> ili9341 on stm32f429-disco board only using the spi bus. except the
>>> display refresh performance is not as good as the ltdc interface.
>>>
>>> I can submit a new patch just with dts changed this week for it, if you need.
>>>
>>
>>
>> Thanks for this status. I'm close to send my PR for v5.9. There is no
>> needs to have an intermediate version (Except you absolutely want it).
>>
>> Thanks
>> alex
> Ok, I prefer to use the ltdc interface to drive ili9341 either.

Ok, so let's wait for the full review of this series.

Cheers
Alex

> 
> Thanks,
> Dillon.
>>
>>> Thanks,
>>> Dillon.
>>>>
>>>>
>>>>
>>>>> V4:
>>>>> According to alexandre torgue's suggestion, combine ili9341 and
>>>>> l3gd20's modification on stm32f429-disco board to one patchset.
>>>>>
>>>>> Changes:
>>>>>
>>>>> ili9341:
>>>>>
>>>>> 1 update ili9341 panel driver according to Linus's suggestion
>>>>> 2 drop V1's No.5 patch, sumbit new changes for clk-stm32f4
>>>>> 3 merge l3gd20's change to this patchset
>>>>>
>>>>> V3:
>>>>> 1 merge original tiny/ili9341.c driver to panel/panel-ilitek-ili9341.c
>>>>>      to support serial spi & parallel rgb interface in one driver.
>>>>> 2 update ilitek,ili9341.yaml dts binding documentation.
>>>>> 3 update stm32f429-disco dts binding
>>>>>
>>>>> V2:
>>>>> 1 verify ilitek,ili9341.yaml with make O=../linux-stm32
>>>>>      dt_binding_check
>>>>>      DT_SCHEMA_FILES=Documentation/devicetree/bindings/display/panel/
>>>>>      ilitek,ili9341.yaml
>>>>>
>>>>> V1:
>>>>> 1 add ili9341 drm panel driver
>>>>> 2 add ltdc, spi5 controller for stm32f429-disco
>>>>> 3 add ltdc, spi5 pin map for stm32f429-disco
>>>>> 4 add docs about ili9341
>>>>> 5 fix ltdc driver loading hang in clk set rate bug
>>>>>
>>>>>
>>>>> L3gd20:
>>>>> V3:
>>>>> 1 merge stm32f429-disco dtbs binding with ili9341 part
>>>>>
>>>>> V2:
>>>>> 1 insert blank line at stm32f420-disco.dts line 143
>>>>> 2 add more description for l3gd20 in commit message
>>>>>
>>>>> V1:
>>>>> 1 enable spi5 controller on stm32f429-disco (dts)
>>>>> 2 add spi5 pinmap for stm32f429-disco  (dts)
>>>>> 3 add SPI_SIMPLEX_RX, SPI_3WIRE_RX support for stm32f4
>>>>>
>>>>>
>>>>> dillon min (8):
>>>>>      ARM: dts: stm32: Add dma config for spi5
>>>>>      ARM: dts: stm32: Add pin map for ltdc & spi5 on stm32f429-disco board
>>>>>      ARM: dts: stm32: enable ltdc binding with ili9341, gyro l3gd20 on
>>>>>        stm32429-disco board
>>>>>      dt-bindings: display: panel: Add ilitek ili9341 panel bindings
>>>>>      clk: stm32: Fix stm32f429's ltdc driver hang in set clock rate,
>>>>>        fix duplicated ltdc clock register to 'clk_core' case ltdc's clock
>>>>>          turn off by clk_disable_unused()
>>>>>      drm/panel: Add ilitek ili9341 panel driver
>>>>>      spi: stm32: Add 'SPI_SIMPLEX_RX', 'SPI_3WIRE_RX' support for stm32f4
>>>>>      spi: flags 'SPI_CONTROLLER_MUST_RX' and 'SPI_CONTROLLER_MUST_TX' can't
>>>>>        be     coexit with 'SPI_3WIRE' mode
>>>>>
>>>>>     .../bindings/display/panel/ilitek,ili9341.yaml     |   69 ++
>>>>>     arch/arm/boot/dts/stm32f4-pinctrl.dtsi             |   67 +
>>>>>     arch/arm/boot/dts/stm32f429-disco.dts              |   48 +
>>>>>     arch/arm/boot/dts/stm32f429.dtsi                   |    3 +
>>>>>     drivers/clk/clk-stm32f4.c                          |    7 +-
>>>>>     drivers/gpu/drm/panel/Kconfig                      |   12 +
>>>>>     drivers/gpu/drm/panel/Makefile                     |    1 +
>>>>>     drivers/gpu/drm/panel/panel-ilitek-ili9341.c       | 1301 ++++++++++++++++++++
>>>>>     drivers/spi/spi-stm32.c                            |   19 +-
>>>>>     drivers/spi/spi.c                                  |    3 +-
>>>>>     10 files changed, 1521 insertions(+), 9 deletions(-)
>>>>>     create mode 100644 Documentation/devicetree/bindings/display/panel/ilitek,ili9341.yaml
>>>>>     create mode 100644 drivers/gpu/drm/panel/panel-ilitek-ili9341.c
>>>>>