netdev - Re: [PATCH 6/8] net: ethernet: ti: am65-cpsw: Add support for SGMII mode for J7200 CPSW5G

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Date:   Wed, 14 Sep 2022 16:44:12 +0100
From:   "Russell King (Oracle)" <linux@...linux.org.uk>
To:     Siddharth Vadapalli <s-vadapalli@...com>
Cc:     davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, robh+dt@...nel.org,
        krzysztof.kozlowski@...aro.org, krzysztof.kozlowski+dt@...aro.org,
        vladimir.oltean@....com, grygorii.strashko@...com, vigneshr@...com,
        nsekhar@...com, netdev@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kishon@...com
Subject: Re: [PATCH 6/8] net: ethernet: ti: am65-cpsw: Add support for SGMII
 mode for J7200 CPSW5G

On Wed, Sep 14, 2022 at 03:20:51PM +0530, Siddharth Vadapalli wrote:
> Add support for SGMII mode in both fixed-link MAC2MAC master mode and
> MAC2PHY modes for CPSW5G ports.
> 
> Add SGMII mode to the list of extra_modes in j7200_cpswxg_pdata.
> 
> The MAC2PHY mode has been tested in fixed-link mode using a bootstrapped
> PHY. The MAC2MAC mode has been tested by a customer with J7200 SoC on
> their device.
> 
> Signed-off-by: Siddharth Vadapalli <s-vadapalli@...com>
> ---
>  drivers/net/ethernet/ti/am65-cpsw-nuss.c | 19 ++++++++++++++++---
>  1 file changed, 16 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/ethernet/ti/am65-cpsw-nuss.c b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> index 1739c389af20..3f40178436ff 100644
> --- a/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> +++ b/drivers/net/ethernet/ti/am65-cpsw-nuss.c
> @@ -75,7 +75,15 @@
>  #define AM65_CPSW_PORTN_REG_TS_CTL_LTYPE2       0x31C
>  
>  #define AM65_CPSW_SGMII_CONTROL_REG		0x010
> +#define AM65_CPSW_SGMII_MR_ADV_ABILITY_REG	0x018

This doesn't seem to be used in this patch, should it be part of some
other patch in the series?

>  #define AM65_CPSW_SGMII_CONTROL_MR_AN_ENABLE	BIT(0)
> +#define AM65_CPSW_SGMII_CONTROL_MASTER_MODE	BIT(5)

Ditto.

> +
> +#define MAC2MAC_MR_ADV_ABILITY_BASE		(BIT(15) | BIT(0))
> +#define MAC2MAC_MR_ADV_ABILITY_FULLDUPLEX	BIT(12)
> +#define MAC2MAC_MR_ADV_ABILITY_1G		BIT(11)
> +#define MAC2MAC_MR_ADV_ABILITY_100M		BIT(10)
> +#define MAC2PHY_MR_ADV_ABILITY			BIT(0)

Most of the above don't seem to be used, and the only one that seems to
be used is used in a variable declaration where the variable isn't used,
and thus us also unused.

>  
>  #define AM65_CPSW_CTL_VLAN_AWARE		BIT(1)
>  #define AM65_CPSW_CTL_P0_ENABLE			BIT(2)
> @@ -1493,6 +1501,7 @@ static void am65_cpsw_nuss_mac_config(struct phylink_config *config, unsigned in
>  	struct am65_cpsw_slave_data *slave = container_of(config, struct am65_cpsw_slave_data,
>  							  phylink_config);
>  	struct am65_cpsw_port *port = container_of(slave, struct am65_cpsw_port, slave);
> +	u32 mr_adv_ability = MAC2MAC_MR_ADV_ABILITY_BASE;

This doesn't seem to be used; should it be part of a different patch?

I get the impression that most of this patch should be elsewhere in this
series.

>  	struct am65_cpsw_common *common = port->common;
>  	struct fwnode_handle *fwnode;
>  	bool fixed_link = false;
> @@ -2105,8 +2114,12 @@ am65_cpsw_nuss_init_port_ndev(struct am65_cpsw_common *common, u32 port_idx)
>  		__set_bit(PHY_INTERFACE_MODE_RMII,
>  			  port->slave.phylink_config.supported_interfaces);
>  	} else if (common->pdata.extra_modes & BIT(port->slave.phy_if)) {
> -		__set_bit(PHY_INTERFACE_MODE_QSGMII,
> -			  port->slave.phylink_config.supported_interfaces);
> +		if (port->slave.phy_if == PHY_INTERFACE_MODE_QSGMII)
> +			__set_bit(PHY_INTERFACE_MODE_QSGMII,
> +				  port->slave.phylink_config.supported_interfaces);
> +		else
> +			__set_bit(PHY_INTERFACE_MODE_SGMII,
> +				  port->slave.phylink_config.supported_interfaces);
>  	} else {
>  		dev_err(dev, "selected phy-mode is not supported\n");
>  		return -EOPNOTSUPP;
> @@ -2744,7 +2757,7 @@ static const struct am65_cpsw_pdata j7200_cpswxg_pdata = {
>  	.quirks = 0,
>  	.ale_dev_id = "am64-cpswxg",
>  	.fdqring_mode = K3_RINGACC_RING_MODE_RING,
> -	.extra_modes = BIT(PHY_INTERFACE_MODE_QSGMII),
> +	.extra_modes = BIT(PHY_INTERFACE_MODE_QSGMII) | BIT(PHY_INTERFACE_MODE_SGMII),
>  };
>  
>  static const struct of_device_id am65_cpsw_nuss_of_mtable[] = {
> -- 
> 2.25.1
> 
> 

-- 
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