linux-kernel - Re: [PATCH 4.19 134/148] usb: phy: generic: Get the vbus supply

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Date: Tue, 26 Mar 2024 17:25:30 -0400
From: Sean Anderson <sean.anderson@...o.com>
To: Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
 stable@...r.kernel.org
Cc: stable <stable@...nel.org>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH 4.19 134/148] usb: phy: generic: Get the vbus supply

On 3/24/24 19:49, Sasha Levin wrote:
> From: Sean Anderson <sean.anderson@...o.com>
>
> [ Upstream commit 03e607cbb2931374db1825f371e9c7f28526d3f4 ]
>
> While support for working with a vbus was added, the regulator was never
> actually gotten (despite what was documented). Fix this by actually
> getting the supply from the device tree.
>
> Fixes: 7acc9973e3c4 ("usb: phy: generic: add vbus support")
> Cc: stable <stable@...nel.org>
> Signed-off-by: Sean Anderson <sean.anderson@...o.com>
> Link: https://cas5-0-urlprotect.trendmicro.com:443/wis/clicktime/v1/query?url=https%3a%2f%2flore.kernel.org%2fr%2f20220425171412.1188485%2d3%2dsean.anderson%40seco.com&umid=d6ce00f6-eb02-4c45-a2bb-d42fb98e3d79&auth=d807158c60b7d2502abde8a2fc01f40662980862-664a4cc6c56716c0ff040724728033a1bce87ec7
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>  drivers/usb/phy/phy-generic.c | 7 +++++++
>  1 file changed, 7 insertions(+)
>
> diff --git a/drivers/usb/phy/phy-generic.c b/drivers/usb/phy/phy-generic.c
> index a53b89be53248..8a04b157f19f3 100644
> --- a/drivers/usb/phy/phy-generic.c
> +++ b/drivers/usb/phy/phy-generic.c
> @@ -283,6 +283,13 @@ int usb_phy_gen_create_phy(struct device *dev, struct usb_phy_generic *nop,
>                       return -EPROBE_DEFER;
>       }
>
> +     nop->vbus_draw = devm_regulator_get_exclusive(dev, "vbus");
> +     if (PTR_ERR(nop->vbus_draw) == -ENODEV)
> +             nop->vbus_draw = NULL;
> +     if (IS_ERR(nop->vbus_draw))
> +             return dev_err_probe(dev, PTR_ERR(nop->vbus_draw),
> +                                  "could not get vbus regulator\n");
> +
>       nop->dev                = dev;
>       nop->phy.dev            = nop->dev;
>       nop->phy.label          = "nop-xceiv";

TBH I would rather not backport this if possible. This will increase the
chance of someone using this behavior which is going to change in
562898808cb1 ("usb: phy: generic: Implement otg->set_vbus").

--Sean

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