linux-kernel - Re: [PATCH net-next v3 3/3] net: dsa: realtek: support reset controller

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Date: Wed, 14 Feb 2024 09:04:03 +0100
From: Linus Walleij <linus.walleij@...aro.org>
To: Luiz Angelo Daros de Luca <luizluca@...il.com>
Cc: Alvin Šipraga <alsi@...g-olufsen.dk>, 
	Andrew Lunn <andrew@...n.ch>, Florian Fainelli <f.fainelli@...il.com>, 
	Vladimir Oltean <olteanv@...il.com>, "David S. Miller" <davem@...emloft.net>, 
	Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
	Rob Herring <robh+dt@...nel.org>, 
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>, Conor Dooley <conor+dt@...nel.org>, 
	Philipp Zabel <p.zabel@...gutronix.de>, netdev@...r.kernel.org, devicetree@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next v3 3/3] net: dsa: realtek: support reset controller

Hi Luiz,

thanks for your patch!

On Wed, Feb 14, 2024 at 1:54 AM Luiz Angelo Daros de Luca
<luizluca@...il.com> wrote:

> The 'reset-gpios' will not work when the switch reset is controlled by a
> reset controller.
>
> Although the reset is optional and the driver performs a soft reset
> during setup, if the initial reset state was asserted, the driver will
> not detect it.
>
> The reset controller will take precedence over the reset GPIO.
>
> Signed-off-by: Luiz Angelo Daros de Luca <luizluca@...il.com>
(...)
> +void rtl83xx_reset_assert(struct realtek_priv *priv)
> +{
> +       int ret;
> +
> +       if (priv->reset_ctl) {
> +               ret = reset_control_assert(priv->reset_ctl);

Actually, reset_control_assert() is NULL-tolerand (as well as the
stubs) so you can just issue this unconditionally. If priv->reset_ctl
is NULL it will just return 0.

> +               if (!ret)
> +                       return;
> +
> +               dev_warn(priv->dev,
> +                        "Failed to assert the switch reset control: %pe\n",
> +                        ERR_PTR(ret));
> +       }
> +
> +       if (priv->reset)
> +               gpiod_set_value(priv->reset, true);

Same here! Also NULL-tolerant. You do not need to check priv->reset.
Just issue it.

> +void rtl83xx_reset_deassert(struct realtek_priv *priv)

Same comments for deassert.

With this fixed (the rest looks just fine):
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Yours,
Linus Walleij