linux-kernel - Re: [PATCH v4 8/8] usb: dwc3: Add Amlogic G12A DWC3 glue

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Date:   Mon, 18 Mar 2019 20:57:20 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Neil Armstrong <narmstrong@...libre.com>
Cc:     gregkh@...uxfoundation.org, hminas@...opsys.com, balbi@...nel.org,
        kishon@...com, linux-amlogic@...ts.infradead.org,
        linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v4 8/8] usb: dwc3: Add Amlogic G12A DWC3 glue

Hi Neil,

On Mon, Mar 18, 2019 at 2:29 PM Neil Armstrong <narmstrong@...libre.com> wrote:
>
> Adds support for Amlogic G12A USB Control Glue HW.
>
> The Amlogic G12A SoC Family embeds 2 USB Controllers :
> - a DWC3 IP configured as Host for USB2 and USB3
> - a DWC2 IP configured as Peripheral USB2 Only
>
> A glue connects these both controllers to 2 USB2 PHYs, and optionnally
> to an USB3+PCIE Combo PHY shared with the PCIE controller.
>
> The Glue configures the UTMI 8bit interfaces for the USB2 PHYs, including
> routing of the OTG PHY between the DWC3 and DWC2 controllers, and
> setups the on-chip OTG mode selection for this PHY.
>
> This drivers supports the on-probe setup of the OTG mode, and manually
> via a debugfs interface. The IRQ mode change detect is yet to be added
> in a future patchset, mainly due to lack of hardware to validate on.
>
> Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
with the small issue fixed (see below) you can add my:
Reviewed-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>

my opinion is that the whole driver is looking great now!
I hope that it will be queued for v5.2 soon because there's no NACK
from the USB / dwc3 maintainers yet.

[...]
> +       ret = of_platform_populate(np, NULL, NULL, dev);
> +       if (ret) {
> +               clk_disable_unprepare(priv->clk);
> +               clk_put(priv->clk);
clk_disable_unprepare is called automatically since there's now an
devm_add_action_or_reset for that a few lines above
clk_put is also unnecessary because priv->clk is obtained with devm_clk_get()


Regards
Martin