linux-kernel - Re: [PATCH 16/26] net: stmmac: dwmac-qcom-ethqos: prepare the driver for more PHY modes

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Message-ID: <20230613165943.zjr4b4p44jhl2dtx@halaney-x13s>
Date:   Tue, 13 Jun 2023 11:59:43 -0500
From:   Andrew Halaney <ahalaney@...hat.com>
To:     Bartosz Golaszewski <brgl@...ev.pl>
Cc:     Vinod Koul <vkoul@...nel.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        "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>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>,
        Jose Abreu <joabreu@...opsys.com>, netdev@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-phy@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-stm32@...md-mailman.stormreply.com,
        Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH 16/26] net: stmmac: dwmac-qcom-ethqos: prepare the driver
 for more PHY modes

On Mon, Jun 12, 2023 at 11:23:45AM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> In preparation for supporting SGMII, let's make the code a bit more
> generic. Add a new callback for MAC configuration so that we can assign
> a different variant of it in the future.
> 
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>

Reviewed-by: Andrew Halaney <ahalaney@...hat.com>

> ---
>  .../stmicro/stmmac/dwmac-qcom-ethqos.c        | 31 ++++++++++++++++---
>  1 file changed, 26 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> index 21f329d2f7eb..2f96f2c11278 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> @@ -92,12 +92,14 @@ struct ethqos_emac_driver_data {
>  struct qcom_ethqos {
>  	struct platform_device *pdev;
>  	void __iomem *rgmii_base;
> +	int (*configure_func)(struct qcom_ethqos *ethqos);
>  
>  	unsigned int rgmii_clk_rate;
>  	struct clk *rgmii_clk;
>  	struct clk *phyaux_clk;
>  	struct phy *serdes_phy;
>  	unsigned int speed;
> +	int phy_mode;
>  
>  	const struct ethqos_emac_por *por;
>  	unsigned int num_por;
> @@ -332,13 +334,11 @@ static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos)
>  {
>  	struct device *dev = &ethqos->pdev->dev;
>  	int phase_shift;
> -	int phy_mode;
>  	int loopback;
>  
>  	/* Determine if the PHY adds a 2 ns TX delay or the MAC handles it */
> -	phy_mode = device_get_phy_mode(dev);
> -	if (phy_mode == PHY_INTERFACE_MODE_RGMII_ID ||
> -	    phy_mode == PHY_INTERFACE_MODE_RGMII_TXID)
> +	if (ethqos->phy_mode == PHY_INTERFACE_MODE_RGMII_ID ||
> +	    ethqos->phy_mode == PHY_INTERFACE_MODE_RGMII_TXID)
>  		phase_shift = 0;
>  	else
>  		phase_shift = RGMII_CONFIG2_TX_CLK_PHASE_SHIFT_EN;
> @@ -485,7 +485,7 @@ static int ethqos_rgmii_macro_init(struct qcom_ethqos *ethqos)
>  	return 0;
>  }
>  
> -static int ethqos_configure(struct qcom_ethqos *ethqos)
> +static int ethqos_configure_rgmii(struct qcom_ethqos *ethqos)
>  {
>  	struct device *dev = &ethqos->pdev->dev;
>  	volatile unsigned int dll_lock;
> @@ -561,6 +561,11 @@ static int ethqos_configure(struct qcom_ethqos *ethqos)
>  	return 0;
>  }
>  
> +static int ethqos_configure(struct qcom_ethqos *ethqos)
> +{
> +	return ethqos->configure_func(ethqos);
> +}
> +
>  static void ethqos_fix_mac_speed(void *priv, unsigned int speed)
>  {
>  	struct qcom_ethqos *ethqos = priv;
> @@ -660,6 +665,22 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
>  		goto out_config_dt;
>  	}
>  
> +	ethqos->phy_mode = device_get_phy_mode(dev);
> +	switch (ethqos->phy_mode) {
> +	case PHY_INTERFACE_MODE_RGMII:
> +	case PHY_INTERFACE_MODE_RGMII_ID:
> +	case PHY_INTERFACE_MODE_RGMII_RXID:
> +	case PHY_INTERFACE_MODE_RGMII_TXID:
> +		ethqos->configure_func = ethqos_configure_rgmii;
> +		break;
> +	case -ENODEV:
> +		ret = -ENODEV;
> +		goto out_config_dt;
> +	default:
> +		ret = -EINVAL;
> +		goto out_config_dt;
> +	}
> +
>  	ethqos->pdev = pdev;
>  	ethqos->rgmii_base = devm_platform_ioremap_resource_byname(pdev, "rgmii");
>  	if (IS_ERR(ethqos->rgmii_base)) {
> -- 
> 2.39.2
>