Re: [PATCH v6 3/3] phy: nuvoton: phy-ma35d1-usb2: extend to dual-port with OTG support

[Vinod Koul <vkoul@kernel.org>]

On 29-09-26, 10:08, Joey Lu wrote:
> PHY0 and PHY1 use the same power-on/reset sequence in USBPMISCR, with
> PHY1 control bits shifted 16 positions relative to PHY0.  A separate
> driver for PHY1 would duplicate this logic, so the existing driver is
> extended to manage both ports.
> 
> The original driver polled only DEVCKSTB after releasing PHY0 from
> reset.  When USB0 operates in host mode (USB ID pin floating or tied
> high) only HSTCKSTB and CK12MSTB assert; DEVCKSTB never sets.  Polling
> exclusively for DEVCKSTB in host mode causes a 1 ms timeout on every
> phy_init() call from the EHCI driver.  The init callback is changed to
> accept either host-mode or device-mode clock stability, whichever
> asserts first.
> 
> The power_on and power_off callbacks are replaced by a single init
> callback that handles PHY reset and clock-stable polling, because
> there is no PHY-specific clock gate on MA35D1; the PHY analog block
> derives its reference from the HXT crystal.
> 
> A read-only USB role switch is registered for PHY0 to expose the USB0
> role to userspace via the standard role-switch sysfs interface.  The
> .set callback returns -EOPNOTSUPP because the hardware mux is fully
> automatic with no software override path.  When CONFIG_USB_ROLE_SWITCH
> is not enabled, the registration returns -ENODEV and the driver skips
> the role switch gracefully without failing probe.
> 
> Two new optional device-tree properties are implemented:
>   - nuvoton,rcalcode: writes per-port 4-bit resistor calibration trim
>     codes to the RCALCODE field in USBPMISCR.
>   - nuvoton,oc-active-high: sets the UHOVRCURH bit in MISCFCR0 to treat
>     the over-current detect input as active-high.
> 
> Signed-off-by: Joey Lu <a0987203069@gmail.com>
> ---
>  drivers/phy/nuvoton/phy-ma35d1-usb2.c | 286 +++++++++++++++++++-------
>  1 file changed, 211 insertions(+), 75 deletions(-)
> 
> diff --git a/drivers/phy/nuvoton/phy-ma35d1-usb2.c b/drivers/phy/nuvoton/phy-ma35d1-usb2.c
> index 9a459b700ed4..547c7d55d8ff 100644
> --- a/drivers/phy/nuvoton/phy-ma35d1-usb2.c
> +++ b/drivers/phy/nuvoton/phy-ma35d1-usb2.c
> @@ -1,11 +1,16 @@
>  // SPDX-License-Identifier: GPL-2.0
>  /*
> - * Copyright (C) 2024 Nuvoton Technology Corp.
> + * Nuvoton MA35D1 USB 2.0 PHY driver
> + *
> + * Supports PHY0 (USB0 OTG port, shared between DWC2 gadget and EHCI0/OHCI0)
> + * and PHY1 (USB1 host-only port, used by EHCI1/OHCI1). The hardware mux on
> + * PHY0 switches automatically via the USB ID pin.
> + *
> + * Copyright (C) 2026 Nuvoton Technology Corp.

Not correct, this should be updated to 2024-2026, you dont drop the
copyright notices, you update them!

>   */
>  #include <linux/bitfield.h>
>  #include <linux/clk.h>
>  #include <linux/delay.h>
> -#include <linux/io.h>

why is this dropped? 
-- 
~Vinod