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Subject[PATCH v4 0/3] arm64: meson: support Amlogic A1 USB OTG controller
Date
This patch series introduces full support for the Amlogic A1 USB controller
in OTG mode (peripheral and host modes switching).

Previously, Amlogic's patch series [1] was applied to the upstream tree,
but it only had USB host mode support.
Furthermore, the device tree patchset [2] wasn't merged due to a missing
clk driver.
Patchset [2] has been completely reworked:
- changed register base offsets to proper values
- introduced dwc2 in peripheral mode
- OTG mode support
- the SoB of Amlogic authors still remain

Testing:
- USB OTG role switching between gadget and host - OK
- Peripheral mode - OK (tested with adb shell/push/pop)
- Host mode - OK (tested only USB enumeration and detection)

Changes v4 since v3 at [5]:
- remove the dtsi patchset from series because it is dependent on the
A1 clock bindings, which are not resolved yet; this is due to the
fact that the A1 clock drivers are currently under review
- remove the patchset for phy as it has already been applied by Vinod
to phy/next at [6]

Changes v3 since v2 at [4]:
- if reset_control_reset() fails during phy_exit() callback
execution, do not disable clkin, instead, return an error
immediately
- provide proper 'phy-names' for the dwc2 device tree node as
'usb2-phy' instead of 'usb2_phy' (replace underscore with dash)

Changes v2 since v1 at [3]:
- as Martin suggested in v1, this commit completely removes
the 'otg_switch_supported' parameter from dwc3_meson_g12a_drvdata;
this parameter is no longer necessary as all IP versions now
support OTG switching
- this commit moves the USB PHY clkin enable/disable calls to
the PHY init/exit routines

Links:
[1] https://lore.kernel.org/all/1581990859-135234-1-git-send-email-hanjie.lin@amlogic.com/
[2] https://lore.kernel.org/all/1581990859-135234-4-git-send-email-hanjie.lin@amlogic.com/
[3] https://lore.kernel.org/all/20230414152423.19842-1-ddrokosov@sberdevices.ru/
[4] https://lore.kernel.org/all/20230418111612.19479-1-ddrokosov@sberdevices.ru/
[5] https://lore.kernel.org/all/20230426102922.19705-1-ddrokosov@sberdevices.ru/
[6] https://lore.kernel.org/all/ZFjAmCcc%2F35MhcuI@matsya/

Dmitry Rokosov (3):
usb: dwc2: support dwc2 IP for Amlogic A1 SoC family
dt-bindings: usb: dwc2: add support for Amlogic A1 SoC USB peripheral
usb: dwc3-meson-g12a: support OTG switch for all IP versions

.../devicetree/bindings/usb/dwc2.yaml | 1 +
drivers/usb/dwc2/params.c | 21 +++++++++++++++++++
drivers/usb/dwc3/dwc3-meson-g12a.c | 16 +++-----------
3 files changed, 25 insertions(+), 13 deletions(-)

--
2.36.0

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