linux-kernel - Re: [PATCH] mdio_bus: Simplify reset handling and extend to non-DT systems

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Date:   Mon, 13 Jan 2020 15:02:36 +0100
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Geert Uytterhoeven <geert+renesas@...der.be>,
        Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Heiner Kallweit <hkallweit1@...il.com>
Cc:     "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mdio_bus: Simplify reset handling and extend to non-DT
 systems

On Mon, 2020-01-13 at 14:05 +0100, Geert Uytterhoeven wrote:
> Convert mdiobus_register_reset() from open-coded DT-only optional reset
> handling to reset_control_get_optional_exclusive().  This not only
> simplifies the code, but also adds support for lookup-based resets on
> non-DT systems.
> 
> Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
> ---
> Only tested on systems without PHY resets, with and without
> CONFIG_RESET_CONTROLLER=y.
> 
>  drivers/net/phy/mdio_bus.c | 16 +++++-----------
>  1 file changed, 5 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/phy/mdio_bus.c b/drivers/net/phy/mdio_bus.c
> index 229e480179ff1de4..8d753bb07227e561 100644
> --- a/drivers/net/phy/mdio_bus.c
> +++ b/drivers/net/phy/mdio_bus.c
> @@ -59,17 +59,11 @@ static int mdiobus_register_gpiod(struct mdio_device *mdiodev)
>  
>  static int mdiobus_register_reset(struct mdio_device *mdiodev)
>  {
> -	struct reset_control *reset = NULL;
> -
> -	if (mdiodev->dev.of_node)
> -		reset = of_reset_control_get_exclusive(mdiodev->dev.of_node,
> -						       "phy");
> -	if (IS_ERR(reset)) {
> -		if (PTR_ERR(reset) == -ENOENT || PTR_ERR(reset) == -ENOTSUPP)
> -			reset = NULL;
> -		else
> -			return PTR_ERR(reset);
> -	}
> +	struct reset_control *reset;
> +
> +	reset = reset_control_get_optional_exclusive(&mdiodev->dev, "phy");
> +	if (IS_ERR(reset))
> +		return PTR_ERR(reset);

Reviewed-by: Philipp Zabel <p.zabel@...gutronix.de>

regards
Philipp