Re: [PATCH net-next v4 3/7] net: dsa: mt7530: simplify mt7530_pad_clk_setup()

["Arınç ÜNAL" <arinc.unal@arinc9.com>]

On 4.02.2024 19:34, Arınç ÜNAL via B4 Relay wrote:
> From: Arınç ÜNAL <arinc.unal@arinc9.com>
> 
> This code is from before this driver was converted to phylink API. Phylink
> deals with the unsupported interface cases before mt7530_pad_clk_setup() is
> run. Therefore, the default case would never run. However, it must be
> defined nonetheless to handle all the remaining enumeration values, the
> phy-modes.
> 
> Switch to if statement for RGMII and return which simplifies the code and
> saves an indent.
> 
> Set P6_INTF_MODE, which is the three least significant bits of the
> MT7530_P6ECR register, to 0 for RGMII even though it will already be 0
> after reset. This is to keep supporting dynamic reconfiguration of the port
> in the case the interface changes from TRGMII to RGMII.
> 
> Disable the TRGMII clocks for all cases. They will be enabled if TRGMII is
> being used.
> 
> Read XTAL after checking for RGMII as it's only needed for the TRGMII
> interface mode.
> 
> Reviewed-by: Daniel Golle <daniel@makrotopia.org>
> Reviewed-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
> Signed-off-by: Arınç ÜNAL <arinc.unal@arinc9.com>
> ---
>   drivers/net/dsa/mt7530.c | 91 +++++++++++++++++++++---------------------------
>   1 file changed, 40 insertions(+), 51 deletions(-)
> 
> diff --git a/drivers/net/dsa/mt7530.c b/drivers/net/dsa/mt7530.c
> index 8b8469eba863..82e90da1e52b 100644
> --- a/drivers/net/dsa/mt7530.c
> +++ b/drivers/net/dsa/mt7530.c
> @@ -418,64 +418,53 @@ static int
>   mt7530_pad_clk_setup(struct dsa_switch *ds, phy_interface_t interface)
>   {
>   	struct mt7530_priv *priv = ds->priv;
> -	u32 ncpo1, ssc_delta, trgint, xtal;
> +	u32 ncpo1, ssc_delta, xtal;
>   
> -	xtal = mt7530_read(priv, MT7530_MHWTRAP) & HWTRAP_XTAL_MASK;
> +	/* Disable the MT7530 TRGMII clocks */
> +	core_clear(priv, CORE_TRGMII_GSW_CLK_CG, REG_TRGMIICK_EN);
>   
> -	switch (interface) {
> -	case PHY_INTERFACE_MODE_RGMII:
> -		trgint = 0;
> -		break;
> -	case PHY_INTERFACE_MODE_TRGMII:
> -		trgint = 1;
> -		if (xtal == HWTRAP_XTAL_25MHZ)
> -			ssc_delta = 0x57;
> -		else
> -			ssc_delta = 0x87;
> -		if (priv->id == ID_MT7621) {
> -			/* PLL frequency: 125MHz: 1.0GBit */
> -			if (xtal == HWTRAP_XTAL_40MHZ)
> -				ncpo1 = 0x0640;
> -			if (xtal == HWTRAP_XTAL_25MHZ)
> -				ncpo1 = 0x0a00;
> -		} else { /* PLL frequency: 250MHz: 2.0Gbit */
> -			if (xtal == HWTRAP_XTAL_40MHZ)
> -				ncpo1 = 0x0c80;
> -			if (xtal == HWTRAP_XTAL_25MHZ)
> -				ncpo1 = 0x1400;
> -		}
> -		break;
> -	default:
> -		dev_err(priv->dev, "xMII interface %d not supported\n",
> -			interface);
> -		return -EINVAL;
> +	if (interface == PHY_INTERFACE_MODE_RGMII) {
> +		mt7530_rmw(priv, MT7530_P6ECR, P6_INTF_MODE_MASK,
> +			   P6_INTF_MODE(0));
> +		return;

This should be "return 0;". I will address this.

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