linux-kernel - Re: [PATCH net] net: phy: Allow BCM54616S PHY to setup internal TX/RX clock delay

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Message-ID: <4844a371-ed1f-9f74-1674-e649a9283f12@gmail.com>
Date:   Mon, 5 Nov 2018 14:40:27 -0800
From:   Florian Fainelli <f.fainelli@...il.com>
To:     Tao Ren <taoren@...com>, Andrew Lunn <andrew@...n.ch>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     openbmc@...ts.ozlabs.org
Subject: Re: [PATCH net] net: phy: Allow BCM54616S PHY to setup internal TX/RX
 clock delay

On 11/5/18 2:35 PM, Tao Ren wrote:
> This patch allows users to enable/disable internal TX and/or RX clock
> delay for BCM54616S PHYs so as to satisfy RGMII timing specifications.
> 
> On a particular platform, whether TX and/or RX clock delay is required
> depends on how PHY connected to the MAC IP. This requirement can be
> specified through "phy-mode" property in the platform device tree.
> 
> The patch is inspired by commit 733336262b28 ("net: phy: Allow BCM5481x
> PHYs to setup internal TX/RX clock delay").

I will let David be the judge whether this is appropriate as a bugfix
(thus targeting the "net" tree) or a feature, which would have to wait
for net-next to re-open.

> 
> Signed-off-by: Tao Ren <taoren@...com>

Reviewed-by: Florian Fainelli <f.fainelli@...il.com>

> ---
>  drivers/net/phy/broadcom.c | 18 ++++++++++++++++--
>  1 file changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c
> index e86ea105c802..704537010453 100644
> --- a/drivers/net/phy/broadcom.c
> +++ b/drivers/net/phy/broadcom.c
> @@ -92,7 +92,7 @@ static int bcm54612e_config_init(struct phy_device *phydev)
>  	return 0;
>  }
>  
> -static int bcm5481x_config(struct phy_device *phydev)
> +static int bcm54xx_config_clock_delay(struct phy_device *phydev)
>  {
>  	int rc, val;
>  
> @@ -429,7 +429,7 @@ static int bcm5481_config_aneg(struct phy_device *phydev)
>  	ret = genphy_config_aneg(phydev);
>  
>  	/* Then we can set up the delay. */
> -	bcm5481x_config(phydev);
> +	bcm54xx_config_clock_delay(phydev);
>  
>  	if (of_property_read_bool(np, "enet-phy-lane-swap")) {
>  		/* Lane Swap - Undocumented register...magic! */
> @@ -442,6 +442,19 @@ static int bcm5481_config_aneg(struct phy_device *phydev)
>  	return ret;
>  }
>  
> +static int bcm54616s_config_aneg(struct phy_device *phydev)
> +{
> +	int ret;
> +
> +	/* Aneg firsly. */
> +	ret = genphy_config_aneg(phydev);
> +
> +	/* Then we can set up the delay. */
> +	bcm54xx_config_clock_delay(phydev);
> +
> +	return ret;
> +}
> +
>  static int brcm_phy_setbits(struct phy_device *phydev, int reg, int set)
>  {
>  	int val;
> @@ -636,6 +649,7 @@ static struct phy_driver broadcom_drivers[] = {
>  	.features	= PHY_GBIT_FEATURES,
>  	.flags		= PHY_HAS_INTERRUPT,
>  	.config_init	= bcm54xx_config_init,
> +	.config_aneg	= bcm54616s_config_aneg,
>  	.ack_interrupt	= bcm_phy_ack_intr,
>  	.config_intr	= bcm_phy_config_intr,
>  }, {
> 


-- 
Florian