netdev - Re: [PATCH net-next 3/3] net: phy: bcm7xxx: request and manage GPHY clock

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Date:   Fri, 4 Sep 2020 08:15:58 +0200
From:   Marco Felsch <m.felsch@...gutronix.de>
To:     Florian Fainelli <f.fainelli@...il.com>
Cc:     netdev@...r.kernel.org, andrew@...n.ch, adam.rudzinski@....net.pl,
        hkallweit1@...il.com, richard.leitner@...data.com,
        zhengdejin5@...il.com, devicetree@...r.kernel.org,
        kernel@...gutronix.de, kuba@...nel.org, robh+dt@...nel.org
Subject: Re: [PATCH net-next 3/3] net: phy: bcm7xxx: request and manage GPHY
 clock

Hi Florian,

On 20-09-02 21:39, Florian Fainelli wrote:
> The internal Gigabit PHY on Broadcom STB chips has a digital clock which
> drives its MDIO interface among other things, the driver now requests
> and manage that clock during .probe() and .remove() accordingly.
> 
> Signed-off-by: Florian Fainelli <f.fainelli@...il.com>
> ---
>  drivers/net/phy/bcm7xxx.c | 18 +++++++++++++++++-
>  1 file changed, 17 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/net/phy/bcm7xxx.c b/drivers/net/phy/bcm7xxx.c
> index 692048d86ab1..f0ffcdcaef03 100644
> --- a/drivers/net/phy/bcm7xxx.c
> +++ b/drivers/net/phy/bcm7xxx.c
> @@ -11,6 +11,7 @@
>  #include "bcm-phy-lib.h"
>  #include <linux/bitops.h>
>  #include <linux/brcmphy.h>
> +#include <linux/clk.h>
>  #include <linux/mdio.h>
>  
>  /* Broadcom BCM7xxx internal PHY registers */
> @@ -39,6 +40,7 @@
>  
>  struct bcm7xxx_phy_priv {
>  	u64	*stats;
> +	struct clk *clk;
>  };
>  
>  static int bcm7xxx_28nm_d0_afe_config_init(struct phy_device *phydev)
> @@ -534,7 +536,19 @@ static int bcm7xxx_28nm_probe(struct phy_device *phydev)
>  	if (!priv->stats)
>  		return -ENOMEM;
>  
> -	return 0;
> +	priv->clk = devm_clk_get_optional(&phydev->mdio.dev, NULL);

Since the clock is binded to the mdio-dev here..

> +	if (IS_ERR(priv->clk))
> +		return PTR_ERR(priv->clk);
> +
> +	return clk_prepare_enable(priv->clk);

clould we use devm_add_action_or_reset() here so we don't have to
register the .remove() hook?

> +}
> +
> +static void bcm7xxx_28nm_remove(struct phy_device *phydev)
> +{
> +	struct bcm7xxx_phy_priv *priv = phydev->priv;
> +
> +	clk_disable_unprepare(priv->clk);
> +	devm_clk_put(&phydev->mdio.dev, priv->clk);

Is this really necessary? The devm_clk_get_optional() function already
registers the devm_clk_release() hook.

Regards,
  Marco

>  }
>  
>  #define BCM7XXX_28NM_GPHY(_oui, _name)					\
> @@ -552,6 +566,7 @@ static int bcm7xxx_28nm_probe(struct phy_device *phydev)
>  	.get_strings	= bcm_phy_get_strings,				\
>  	.get_stats	= bcm7xxx_28nm_get_phy_stats,			\
>  	.probe		= bcm7xxx_28nm_probe,				\
> +	.remove		= bcm7xxx_28nm_remove,				\
>  }
>  
>  #define BCM7XXX_28NM_EPHY(_oui, _name)					\
> @@ -567,6 +582,7 @@ static int bcm7xxx_28nm_probe(struct phy_device *phydev)
>  	.get_strings	= bcm_phy_get_strings,				\
>  	.get_stats	= bcm7xxx_28nm_get_phy_stats,			\
>  	.probe		= bcm7xxx_28nm_probe,				\
> +	.remove		= bcm7xxx_28nm_remove,				\
>  }
>  
>  #define BCM7XXX_40NM_EPHY(_oui, _name)					\
> -- 
> 2.25.1
> 
> 

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