netdev - Re: [PATCH net-next v2 5/5] net-next: dsa: add dsa support for Mediatek MT7530 switch

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Date:   Fri, 24 Mar 2017 15:19:53 +0100
From:   Andrew Lunn <andrew@...n.ch>
To:     sean.wang@...iatek.com
Cc:     f.fainelli@...il.com, vivien.didelot@...oirfairelinux.com,
        matthias.bgg@...il.com, robh+dt@...nel.org, mark.rutland@....com,
        devicetree@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mediatek@...ts.infradead.org,
        davem@...emloft.net, Landen.Chao@...iatek.com, keyhaede@...il.com,
        objelf@...il.com
Subject: Re: [PATCH net-next v2 5/5] net-next: dsa: add dsa support for
 Mediatek MT7530 switch

On Tue, Mar 21, 2017 at 05:35:10PM +0800, sean.wang@...iatek.com wrote:

Hi Sean

> +	/* Lower Tx Driving */
> +	for (i = 0 ; i < 6 ; i++)

Could MT7530_CPU_PORT be used here? 

> +		mt7530_write(priv, MT7530_TRGMII_TD_ODT(i),
> +			     TD_DM_DRVP(8) | TD_DM_DRVN(8));
> +
> +	/* Setup MT7530 core clock */
> +	if (!trgint) {
> +		/* Disable MT7530 core clock */
> +		core_clear(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
> +
> +		/* Disable MT7530 PLL, since phy_device has not yet been
> +		 * created when this function is called. So we provide
> +		 * core_write_mmd_indirect to complete this function
> +		 */
> +		core_write_mmd_indirect(priv,
> +					CORE_GSWPLL_GRP1,
> +					MDIO_MMD_VEND2,
> +					0);
> +
> +		/* Setup MT7530 core clock into 500Mhz */
> +		core_write(priv, CORE_GSWPLL_GRP2,
> +			   RG_GSWPLL_POSDIV_500M(1) |
> +			   RG_GSWPLL_FBKDIV_500M(25));
> +
> +		/* Enable MT7530 PLL */
> +		core_write(priv, CORE_GSWPLL_GRP1,
> +			   RG_GSWPLL_EN_PRE |
> +			   RG_GSWPLL_POSDIV_200M(2) |
> +			   RG_GSWPLL_FBKDIV_200M(32));
> +
> +		/* Enable MT7530 core clock */
> +		core_set(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
> +	}
> +
> +	/* Setup the MT7530 TRGMII Tx Clock */
> +	core_set(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN);
> +	core_write(priv, CORE_PLL_GROUP5, RG_LCDDS_PCW_NCPO1(ncpo1));
> +	core_write(priv, CORE_PLL_GROUP6, RG_LCDDS_PCW_NCPO0(0));
> +	core_write(priv, CORE_PLL_GROUP10, RG_LCDDS_SSC_DELTA(ssc_delta));
> +	core_write(priv, CORE_PLL_GROUP11, RG_LCDDS_SSC_DELTA1(ssc_delta));
> +	core_write(priv, CORE_PLL_GROUP4,
> +		   RG_SYSPLL_DDSFBK_EN | RG_SYSPLL_BIAS_EN |
> +		   RG_SYSPLL_BIAS_LPF_EN);
> +	core_write(priv, CORE_PLL_GROUP2,
> +		   RG_SYSPLL_EN_NORMAL | RG_SYSPLL_VODEN |
> +		   RG_SYSPLL_POSDIV(1));
> +	core_write(priv, CORE_PLL_GROUP7,
> +		   RG_LCDDS_PCW_NCPO_CHG | RG_LCCDS_C(3) |
> +		   RG_LCDDS_PWDB | RG_LCDDS_ISO_EN);
> +	core_set(priv, CORE_TRGMII_GSW_CLK_CG,
> +		 REG_GSWCK_EN | REG_TRGMIICK_EN);
> +
> +	if (!trgint)
> +		for (i = 0 ; i < 5 ; i++)

Why only 5 here? All other similar loops are to 6.  Replacing 5 with a
#define might help make this more readable.

> +			mt7530_rmw(priv, MT7530_TRGMII_RD(i),
> +				   RD_TAP_MASK, RD_TAP(16));
> +	else
> +		mt7623_trgmii_set(priv, GSW_INTF_MODE, INTF_MODE_TRGMII);
> +
> +	return 0;
> +}
> +
> +static int
> +mt7623_pad_clk_setup(struct dsa_switch *ds)
> +{
> +	struct mt7530_priv *priv = ds->priv;
> +	int i;
> +
> +	for (i = 0 ; i < 6; i++)

MT7530_CPU_PORT?

> +
> +/* Registers to mac forward conrol for unknown frames */

/conrol/control

> +
> +/* Registor for port control */

Register

> +/* Regiser for TOP signal control */

Register

> +/* struct mt7530_priv -	This is the main datasructure for holding the state

data structure

> + *			of the driver
> + * @dev:		The device pointer
> + * @ds:			The pointer to the dsa core structure
> + * @bus:		The bus used for the device and built-in PHY
> + * @ethsys:		The regmap used for enabling the necessary PLL
> + * @ethernet:		The regmap used for access TRGMII-based registers
> + * @core_pwr:		The power supplied into the core
> + * @io_pwr:		The power supplied into the I/O
> + * @mcm:		Flag for distinguishing if standalone IC or module
> + *			coupling
> + * @reset:		The descriptor for GPIO line tied to its reset pin
> + * @phy_mode:		The xMII for cpu port used
> + * @ports:		Holding the state amongs ports

among

	Andrew