linux-kernel - Re: [PATCH 4/5] phy: renesas: rcar-gen3-usb2: Add support for RZ/T2H SoC

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Message-ID: <CAMuHMdVMKzJtomQzzZaHXbhhEJ_3u71Kj7QcMhRgCXcDWY-Kqw@mail.gmail.com>
Date: Wed, 6 Aug 2025 16:51:48 +0200
From: Geert Uytterhoeven <geert@...ux-m68k.org>
To: Prabhakar <prabhakar.csengg@...il.com>
Cc: Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>, Rob Herring <robh@...nel.org>, 
	Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley <conor+dt@...nel.org>, 
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>, 
	Geert Uytterhoeven <geert+renesas@...der.be>, Magnus Damm <magnus.damm@...il.com>, 
	linux-phy@...ts.infradead.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org, linux-renesas-soc@...r.kernel.org, 
	Biju Das <biju.das.jz@...renesas.com>, 
	Fabrizio Castro <fabrizio.castro.jz@...esas.com>, 
	Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: Re: [PATCH 4/5] phy: renesas: rcar-gen3-usb2: Add support for RZ/T2H SoC

Hi Prabhakar,

On Tue, 5 Aug 2025 at 14:25, Prabhakar <prabhakar.csengg@...il.com> wrote:
> From: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
>
> Add initial support for the Renesas RZ/T2H SoC to the R-Car Gen3 USB2 PHY
> driver. The RZ/T2H SoC requires configuration of additional
> hardware-specific bits for proper VBUS level control and OTG operation.
>
> Introduce the `vblvl_ctrl` flag in the SoC-specific driver data to enable
> handling of VBUS level selection logic using `VBCTRL.VBLVL` bits. This is
> required for managing the VBUS status detection and drive logic based on
> SoC-specific needs.
>
> Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>

Thanks for your patch!

> --- a/drivers/phy/renesas/phy-rcar-gen3-usb2.c
> +++ b/drivers/phy/renesas/phy-rcar-gen3-usb2.c

> @@ -284,6 +293,21 @@ static void rcar_gen3_init_from_a_peri_to_a_host(struct rcar_gen3_chan *ch)
>
>  static bool rcar_gen3_check_id(struct rcar_gen3_chan *ch)
>  {
> +       if (ch->drvdata->vblvl_ctrl) {
> +               bool vbus_valid = false;
> +               bool device = false;

No need to preinitialize these two variables.

> +
> +               device = !!(readl(ch->base + USB2_ADPCTRL) & USB2_ADPCTRL_IDDIG);
> +               vbus_valid = !!(readl(ch->base + USB2_ADPCTRL) & USB2_ADPCTRL_VBUSVALID);
> +
> +               if (device && vbus_valid)
> +                       return true;
> +               else if (!device && vbus_valid)

No need for else after return, but...

> +                       return false;
> +
> +               return !(device && !vbus_valid);

... all logic above can be simplified to

    return vbus_valid ? device : !device;

> +       }
> +
>         if (!ch->uses_otg_pins)
>                 return (ch->dr_mode == USB_DR_MODE_HOST) ? false : true;
>

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds