[PATCH usb-next v2 0/3] DWC3 support for Amlogic Meson AXG and GXL SoCs

Martin Blumenstingl martin.blumenstingl at googlemail.com
Sat Mar 3 13:50:51 PST 2018

Hello Felipe, Hello Greg,

On Tue, Feb 20, 2018 at 11:39 PM, Martin Blumenstingl
<martin.blumenstingl at googlemail.com> wrote:
> Hello Felipe,
> On Sun, Feb 11, 2018 at 10:15 PM, Martin Blumenstingl
> <martin.blumenstingl at googlemail.com> wrote:
>> Amlogic Meson AXG and GXL SoCs can use the dwc3-of-simple with little
>> modifications. These SoCs use:
>> - a gate clock for the USB components (DWC3, USB PHYs)
>> - a reset line which is shared across all USB components (DWC3, USB2 and
>>   USB3 PHYs, OTG detection logic inside the USB3 PHY registers)
>> - a reset pulse to trigger the reset
>> - depending on the SoC two or more PHYs (AXG: 1x USB2 and 1x USB3 PHY,
>>   GXL: 2x USB2 and 1x USB3 PHY)
>> This extends the dwc3-of-simple so it supports (depending on the
>> platform) shared and level resets. Additionally it adds new bindings
>> for the Amlogic Meson AXG and GXL SoCs, along with the documentation
>> (dt-bindings).
>> NOTE: for full support on Amlogic Meson GXL SoCs my other series called
>> "initialize (multiple) PHYs for a HCD" (see [0] for v8 of that series)
>> is required. However, there is no direct dependency on that series.
>> Especially since Meson AXG doesn't need it (since it only has one USB2
>> and one USB3 PHY, which is already supported by the current dwc3 driver,
>> unlike the 2x USB2 and 1x USB3 PHYs on Meson GXL).
>> So I believe that this series can still be merged, even if the other
>> patchset is not ready yet.
>> changes since v1 at [1]:
>> - use of_device_is_compatible() instead of struct dwc3_of_simple_params
>>   as requested by Felipe Balbi (affects PATCH #2 and #3)
>> - added Rob's Acked-by to the dt-bindings patch
>> - added Yixun Lan's Tested-by to the whole series as he tested this
>>   successfully (along with other patches) on the Amlogic Meson AXG SoC
>> [0] http://lists.infradead.org/pipermail/linux-amlogic/2018-January/006274.html
>> [1] http://lists.infradead.org/pipermail/linux-amlogic/2018-January/006286.html
>> Martin Blumenstingl (3):
>>   dt-bindings: usb: add support for dwc3 controller on Amlogic Meson GX
>>   usb: dwc3: of-simple: add support for shared and pulsed reset lines
>>   usb: dwc3: of-simple: add support for the Amlogic Meson GXL and AXG
>>     SoCs
> could you please let me know if you spotted any problems, code-style
> issues in v2 or whether you are waiting for feedback from another
> maintainer?
> in case everything is fine: will you take this series through your tree?
could you please let me know how this series is supposed to land in
the next kernel release:
- Felipe, will you take it through your usb tree (which contains many
other dwc2/dwc3 driver changes)?
- Greg, will you take it through your usb-next tree?
- should Kevin apply it to his linux-amlogic tree (drivers branch,
which goes to the the arm-soc tree)?

as noted in the cover-letter Meson AXG support does not depend on any
other series


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