linux-kernel - Re: [PATCH 10/14] phy: meson8b-usb2: simplify optional reset handling

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Message-ID: <CAFBinCAASGS19naW76vfynRj4Fg4KjpHcwGr5h+pWZae47rwRg@mail.gmail.com>
Date:   Wed, 15 Feb 2017 00:36:56 +0100
From:   Martin Blumenstingl <martin.blumenstingl@...glemail.com>
To:     Philipp Zabel <p.zabel@...gutronix.de>
Cc:     linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Ramiro Oliveira <Ramiro.Oliveira@...opsys.com>,
        Kevin Hilman <khilman@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        Kishon Vijay Abraham I <kishon@...com>,
        Jerome Brunet <jbrunet@...libre.com>
Subject: Re: [PATCH 10/14] phy: meson8b-usb2: simplify optional reset handling

Hi Philipp,

sorry for the late reply.
unfortunately my GXBB board (which is supported by the driver below) is dead.
I CC'ed Jerome Brunet - maybe he can give it a go on one of his (GXBB) boards.

On Mon, Jan 30, 2017 at 12:41 PM, Philipp Zabel <p.zabel@...gutronix.de> wrote:
> As of commit bb475230b8e5 ("reset: make optional functions really
> optional"), the reset framework API calls use NULL pointers to describe
> optional, non-present reset controls.
>
> This allows to return errors from devm_reset_control_get_optional_shared
> and to call reset_control_reset unconditionally.
>
> Signed-off-by: Philipp Zabel <p.zabel@...gutronix.de>
Acked-by: Martin Blumenstingl <martin.blumenstingl@...glemail.com>

(based on reading the code along with the highly appreciated changes
from bb475230b8e5)

> Cc: Martin Blumenstingl <martin.blumenstingl@...glemail.com>
> Cc: Kevin Hilman <khilman@...libre.com>
> Cc: Carlo Caione <carlo@...one.org>
> Cc: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/phy/phy-meson8b-usb2.c | 12 +++++-------
>  1 file changed, 5 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/phy/phy-meson8b-usb2.c b/drivers/phy/phy-meson8b-usb2.c
> index 33c9f4ba157d1..87168f1fe3af6 100644
> --- a/drivers/phy/phy-meson8b-usb2.c
> +++ b/drivers/phy/phy-meson8b-usb2.c
> @@ -141,12 +141,10 @@ static int phy_meson8b_usb2_power_on(struct phy *phy)
>         struct phy_meson8b_usb2_priv *priv = phy_get_drvdata(phy);
>         int ret;
>
> -       if (!IS_ERR_OR_NULL(priv->reset)) {
> -               ret = reset_control_reset(priv->reset);
> -               if (ret) {
> -                       dev_err(&phy->dev, "Failed to trigger USB reset\n");
> -                       return ret;
> -               }
> +       ret = reset_control_reset(priv->reset);
> +       if (ret) {
> +               dev_err(&phy->dev, "Failed to trigger USB reset\n");
> +               return ret;
>         }
>
>         ret = clk_prepare_enable(priv->clk_usb_general);
> @@ -241,7 +239,7 @@ static int phy_meson8b_usb2_probe(struct platform_device *pdev)
>                 return PTR_ERR(priv->clk_usb);
>
>         priv->reset = devm_reset_control_get_optional_shared(&pdev->dev, NULL);
> -       if (PTR_ERR(priv->reset) == -EPROBE_DEFER)
> +       if (PTR_ERR(priv->reset))
>                 return PTR_ERR(priv->reset);
>
>         priv->dr_mode = of_usb_get_dr_mode_by_phy(pdev->dev.of_node, -1);
> --
> 2.11.0
>