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Date:   Mon, 27 Feb 2017 13:17:49 +0200
From:   Mikko Perttunen <cyndis@...si.fi>
To:     Thierry Reding <thierry.reding@...il.com>,
        "David S . Miller" <davem@...emloft.net>
Cc:     Giuseppe Cavallaro <peppe.cavallaro@...com>,
        Alexandre Torgue <alexandre.torgue@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Joao Pinto <Joao.Pinto@...opsys.com>,
        Alexandre Courbot <gnurou@...il.com>,
        Jon Hunter <jonathanh@...dia.com>, netdev@...r.kernel.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/7] net: stmmac: dwc-qos: Split out ->probe() and
 ->remove()

On 23.02.2017 19:24, Thierry Reding wrote:
> From: Thierry Reding <treding@...dia.com>
>
> Split out the binding specific parts of ->probe() and ->remove() to
> enable the driver to support variants of the binding. This is useful in
> order to keep backwards-compatibility while making it easy for a sub-
> driver to deal only with the updated bindings rather than having to add
> compatibility quirks all over the place.
>
> Signed-off-by: Thierry Reding <treding@...dia.com>
> ---
>  .../ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c    | 114 ++++++++++++++++-----
>  1 file changed, 88 insertions(+), 26 deletions(-)
>
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
> index 1a3fa3d9f855..5071d3c15adc 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-dwc-qos-eth.c
> @@ -18,6 +18,7 @@
>  #include <linux/io.h>
>  #include <linux/ioport.h>
>  #include <linux/module.h>
> +#include <linux/of_device.h>
>  #include <linux/of_net.h>
>  #include <linux/mfd/syscon.h>
>  #include <linux/platform_device.h>
> @@ -106,13 +107,70 @@ static int dwc_eth_dwmac_config_dt(struct platform_device *pdev,
>  	return 0;
>  }
>
> +static void *dwc_qos_probe(struct platform_device *pdev,
> +			   struct plat_stmmacenet_data *plat_dat,
> +			   struct stmmac_resources *stmmac_res)
> +{
> +	int err;
> +
> +	plat_dat->stmmac_clk = devm_clk_get(&pdev->dev, "apb_pclk");
> +	if (IS_ERR(plat_dat->stmmac_clk)) {
> +		dev_err(&pdev->dev, "apb_pclk clock not found.\n");
> +		return ERR_CAST(plat_dat->stmmac_clk);
> +	}
> +
> +	clk_prepare_enable(plat_dat->stmmac_clk);
> +
> +	plat_dat->pclk = devm_clk_get(&pdev->dev, "phy_ref_clk");
> +	if (IS_ERR(plat_dat->pclk)) {
> +		dev_err(&pdev->dev, "phy_ref_clk clock not found.\n");
> +		err = PTR_ERR(plat_dat->pclk);
> +		goto disable;
> +	}
> +
> +	clk_prepare_enable(plat_dat->pclk);
> +
> +	return NULL;
> +
> +disable:
> +	clk_disable_unprepare(plat_dat->stmmac_clk);
> +	return ERR_PTR(err);
> +}
> +
> +static int dwc_qos_remove(struct platform_device *pdev)
> +{
> +	struct net_device *ndev = platform_get_drvdata(pdev);
> +	struct stmmac_priv *priv = netdev_priv(ndev);
> +
> +	clk_disable_unprepare(priv->plat->pclk);
> +	clk_disable_unprepare(priv->plat->stmmac_clk);
> +
> +	return 0;
> +}
> +
> +struct dwc_eth_dwmac_data {
> +	void *(*probe)(struct platform_device *pdev,
> +		       struct plat_stmmacenet_data *data,
> +		       struct stmmac_resources *res);
> +	int (*remove)(struct platform_device *pdev);
> +};
> +
> +static const struct dwc_eth_dwmac_data dwc_qos_data = {
> +	.probe = dwc_qos_probe,
> +	.remove = dwc_qos_remove,
> +};
> +
>  static int dwc_eth_dwmac_probe(struct platform_device *pdev)
>  {
> +	const struct dwc_eth_dwmac_data *data;
>  	struct plat_stmmacenet_data *plat_dat;
>  	struct stmmac_resources stmmac_res;
>  	struct resource *res;
> +	void *priv;
>  	int ret;
>
> +	data = of_device_get_match_data(&pdev->dev);
> +
>  	memset(&stmmac_res, 0, sizeof(struct stmmac_resources));
>
>  	/**
> @@ -138,39 +196,26 @@ static int dwc_eth_dwmac_probe(struct platform_device *pdev)
>  	if (IS_ERR(plat_dat))
>  		return PTR_ERR(plat_dat);
>
> -	plat_dat->stmmac_clk = devm_clk_get(&pdev->dev, "apb_pclk");
> -	if (IS_ERR(plat_dat->stmmac_clk)) {
> -		dev_err(&pdev->dev, "apb_pclk clock not found.\n");
> -		ret = PTR_ERR(plat_dat->stmmac_clk);
> -		plat_dat->stmmac_clk = NULL;
> -		goto err_remove_config_dt;
> -	}
> -	clk_prepare_enable(plat_dat->stmmac_clk);
> -
> -	plat_dat->pclk = devm_clk_get(&pdev->dev, "phy_ref_clk");
> -	if (IS_ERR(plat_dat->pclk)) {
> -		dev_err(&pdev->dev, "phy_ref_clk clock not found.\n");
> -		ret = PTR_ERR(plat_dat->pclk);
> -		plat_dat->pclk = NULL;
> -		goto err_out_clk_dis_phy;
> +	priv = data->probe(pdev, plat_dat, &stmmac_res);
> +	if (IS_ERR(priv)) {
> +		ret = PTR_ERR(priv);
> +		dev_err(&pdev->dev, "failed to probe subdriver: %d\n", ret);
> +		goto remove_config;
>  	}
> -	clk_prepare_enable(plat_dat->pclk);
>
>  	ret = dwc_eth_dwmac_config_dt(pdev, plat_dat);
>  	if (ret)
> -		goto err_out_clk_dis_aper;
> +		goto remove;
>
>  	ret = stmmac_dvr_probe(&pdev->dev, plat_dat, &stmmac_res);
>  	if (ret)
> -		goto err_out_clk_dis_aper;
> +		goto remove;
>
> -	return 0;
> +	return ret;
>
> -err_out_clk_dis_aper:
> -	clk_disable_unprepare(plat_dat->pclk);
> -err_out_clk_dis_phy:
> -	clk_disable_unprepare(plat_dat->stmmac_clk);
> -err_remove_config_dt:
> +remove:
> +	data->remove(pdev);
> +remove_config:
>  	stmmac_remove_config_dt(pdev, plat_dat);
>
>  	return ret;
> @@ -178,11 +223,28 @@ static int dwc_eth_dwmac_probe(struct platform_device *pdev)
>
>  static int dwc_eth_dwmac_remove(struct platform_device *pdev)
>  {
> -	return stmmac_pltfr_remove(pdev);
> +	struct net_device *ndev = platform_get_drvdata(pdev);
> +	struct stmmac_priv *priv = netdev_priv(ndev);
> +	const struct dwc_eth_dwmac_data *data;
> +	int err;
> +
> +	data = of_device_get_match_data(&pdev->dev);
> +
> +	err = stmmac_dvr_remove(&pdev->dev);
> +	if (err < 0)
> +		dev_err(&pdev->dev, "failed to remove platform: %d\n", err);
> +
> +	err = data->remove(pdev);
> +	if (err < 0)
> +		dev_err(&pdev->dev, "failed to remove subdriver: %d\n", err);
> +
> +	stmmac_remove_config_dt(pdev, priv->plat);
> +
> +	return err;
>  }
>
>  static const struct of_device_id dwc_eth_dwmac_match[] = {
> -	{ .compatible = "snps,dwc-qos-ethernet-4.10", },
> +	{ .compatible = "snps,dwc-qos-ethernet-4.10", .data = &dwc_qos_data },
>  	{ }
>  };
>  MODULE_DEVICE_TABLE(of, dwc_eth_dwmac_match);
>

Reviewed-by: Mikko Perttunen <mperttunen@...dia.com>

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