netdev - Re: [net-next,PATCH 2/2] net: stmmac: dwmac-stm32: stm32: add management of stm32mp25 for stm32

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Date: Fri, 14 Jun 2024 15:58:33 +0200
From: Marek Vasut <marex@...x.de>
To: Christophe Roullier <christophe.roullier@...s.st.com>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Richard Cochran <richardcochran@...il.com>, Jose Abreu
 <joabreu@...opsys.com>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [net-next,PATCH 2/2] net: stmmac: dwmac-stm32: stm32: add
 management of stm32mp25 for stm32

On 6/14/24 3:08 PM, Christophe Roullier wrote:

[...]

> +static int stm32mp2_configure_syscfg(struct plat_stmmacenet_data *plat_dat)
> +{
> +	struct stm32_dwmac *dwmac = plat_dat->bsp_priv;
> +	u32 reg = dwmac->mode_reg;
> +	int val = 0;
> +
> +	switch (plat_dat->mac_interface) {
> +	case PHY_INTERFACE_MODE_MII:
> +		break;

dwmac->enable_eth_ck does not apply to MII mode ? Why ?

> +	case PHY_INTERFACE_MODE_GMII:
> +		if (dwmac->enable_eth_ck)
> +			val |= SYSCFG_ETHCR_ETH_CLK_SEL;
> +		break;
> +	case PHY_INTERFACE_MODE_RMII:
> +		val = SYSCFG_ETHCR_ETH_SEL_RMII;
> +		if (dwmac->enable_eth_ck)
> +			val |= SYSCFG_ETHCR_ETH_REF_CLK_SEL;
> +		break;
> +	case PHY_INTERFACE_MODE_RGMII:
> +	case PHY_INTERFACE_MODE_RGMII_ID:
> +	case PHY_INTERFACE_MODE_RGMII_RXID:
> +	case PHY_INTERFACE_MODE_RGMII_TXID:
> +		val = SYSCFG_ETHCR_ETH_SEL_RGMII;
> +		if (dwmac->enable_eth_ck)
> +			val |= SYSCFG_ETHCR_ETH_CLK_SEL;
> +		break;
> +	default:
> +		dev_err(dwmac->dev, "Mode %s not supported",
> +			phy_modes(plat_dat->mac_interface));
> +		/* Do not manage others interfaces */
> +		return -EINVAL;
> +	}
> +
> +	dev_dbg(dwmac->dev, "Mode %s", phy_modes(plat_dat->mac_interface));
> +
> +	/*  select PTP (IEEE1588) clock selection from RCC (ck_ker_ethxptp) */

Drop extra leading space.
Sentence starts with capital letter.

> +	val |= SYSCFG_ETHCR_ETH_PTP_CLK_SEL;
> +
> +	/* Update ETHCR (set register) */
> +	return regmap_update_bits(dwmac->regmap, reg,
> +				 SYSCFG_MP2_ETH_MASK, val);
> +}
> +
>   static int stm32mp1_set_mode(struct plat_stmmacenet_data *plat_dat)
>   {
>   	int ret;
> @@ -292,6 +346,21 @@ static int stm32mp1_set_mode(struct plat_stmmacenet_data *plat_dat)
>   	return stm32mp1_configure_pmcr(plat_dat);
>   }
>   
> +static int stm32mp2_set_mode(struct plat_stmmacenet_data *plat_dat)
> +{
> +	int ret;
> +
> +	ret = stm32mp1_select_ethck_external(plat_dat);
> +	if (ret)
> +		return ret;
> +
> +	ret = stm32mp1_validate_ethck_rate(plat_dat);
> +	if (ret)
> +		return ret;


Is it necessary to duplicate this entire function instead of some:

if (is_mp2)
   return stm32mp2_configure_syscfg(plat_dat);
else
   return stm32mp1_configure_syscfg(plat_dat);

?

> +	return stm32mp2_configure_syscfg(plat_dat);
> +}
> +
>   static int stm32mcu_set_mode(struct plat_stmmacenet_data *plat_dat)
>   {
>   	struct stm32_dwmac *dwmac = plat_dat->bsp_priv;
> @@ -348,12 +417,6 @@ static int stm32_dwmac_parse_data(struct stm32_dwmac *dwmac,
>   		return PTR_ERR(dwmac->clk_rx);
>   	}
>   
> -	if (dwmac->ops->parse_data) {
> -		err = dwmac->ops->parse_data(dwmac, dev);
> -		if (err)
> -			return err;
> -	}
> -
>   	/* Get mode register */
>   	dwmac->regmap = syscon_regmap_lookup_by_phandle(np, "st,syscon");
>   	if (IS_ERR(dwmac->regmap))
> @@ -365,20 +428,14 @@ static int stm32_dwmac_parse_data(struct stm32_dwmac *dwmac,
>   		return err;
>   	}
>   
> -	dwmac->mode_mask = SYSCFG_MP1_ETH_MASK;
> -	err = of_property_read_u32_index(np, "st,syscon", 2, &dwmac->mode_mask);
> -	if (err) {
> -		if (dwmac->ops->is_mp13)
> -			dev_err(dev, "Sysconfig register mask must be set (%d)\n", err);
> -		else
> -			dev_dbg(dev, "Warning sysconfig register mask not set\n");
> -	}
> +	if (dwmac->ops->parse_data)
> +		err = dwmac->ops->parse_data(dwmac, dev);

Why is this change here ? What is the purpose ?
This should be documented in commit message too.

The indirect call is not necessary either, simply do

if (is_mp2)
   return err;

... do mp15/13 stuff here ...

return err;

[...]