netdev - Re: [net-next PATCH RESEND 2/2] net: macb: add polarfire soc reset support

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Date:   Fri, 1 Jul 2022 07:47:34 +0000
From:   <Claudiu.Beznea@...rochip.com>
To:     <Conor.Dooley@...rochip.com>, <davem@...emloft.net>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <Nicolas.Ferre@...rochip.com>
CC:     <netdev@...r.kernel.org>, <devicetree@...r.kernel.org>,
        <linux-riscv@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [net-next PATCH RESEND 2/2] net: macb: add polarfire soc reset
 support

On 01.07.2022 09:58, Conor Dooley wrote:
> To date, the Microchip PolarFire SoC (MPFS) has been using the
> cdns,macb compatible, however the generic device does not have reset
> support. Add a new compatible & .data for MPFS to hook into the reset
> functionality added for zynqmp support (and make the zynqmp init
> function generic in the process).
> 
> Signed-off-by: Conor Dooley <conor.dooley@...rochip.com>
> ---
>  drivers/net/ethernet/cadence/macb_main.c | 25 +++++++++++++++++-------
>  1 file changed, 18 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/net/ethernet/cadence/macb_main.c b/drivers/net/ethernet/cadence/macb_main.c
> index d89098f4ede8..325f0463fd42 100644
> --- a/drivers/net/ethernet/cadence/macb_main.c
> +++ b/drivers/net/ethernet/cadence/macb_main.c
> @@ -4689,33 +4689,32 @@ static const struct macb_config np4_config = {
>  	.usrio = &macb_default_usrio,
>  };
>  
> -static int zynqmp_init(struct platform_device *pdev)
> +static int init_reset_optional(struct platform_device *pdev)

It doesn't sound like a good name for this function but I don't have
something better to propose.

>  {
>  	struct net_device *dev = platform_get_drvdata(pdev);
>  	struct macb *bp = netdev_priv(dev);
>  	int ret;
>  
>  	if (bp->phy_interface == PHY_INTERFACE_MODE_SGMII) {
> -		/* Ensure PS-GTR PHY device used in SGMII mode is ready */
> +		/* Ensure PHY device used in SGMII mode is ready */
>  		bp->sgmii_phy = devm_phy_optional_get(&pdev->dev, NULL);
>  
>  		if (IS_ERR(bp->sgmii_phy)) {
>  			ret = PTR_ERR(bp->sgmii_phy);
>  			dev_err_probe(&pdev->dev, ret,
> -				      "failed to get PS-GTR PHY\n");
> +				      "failed to get SGMII PHY\n");
>  			return ret;
>  		}
>  
>  		ret = phy_init(bp->sgmii_phy);
>  		if (ret) {
> -			dev_err(&pdev->dev, "failed to init PS-GTR PHY: %d\n",
> +			dev_err(&pdev->dev, "failed to init SGMII PHY: %d\n",
>  				ret);
>  			return ret;
>  		}
>  	}
>  
> -	/* Fully reset GEM controller at hardware level using zynqmp-reset driver,
> -	 * if mapped in device tree.
> +	/* Fully reset controller at hardware level if mapped in device tree
>  	 */

The new comment can fit on a single line.

>  	ret = device_reset_optional(&pdev->dev);
>  	if (ret) {
> @@ -4737,7 +4736,7 @@ static const struct macb_config zynqmp_config = {
>  			MACB_CAPS_GEM_HAS_PTP | MACB_CAPS_BD_RD_PREFETCH,
>  	.dma_burst_length = 16,
>  	.clk_init = macb_clk_init,
> -	.init = zynqmp_init,
> +	.init = init_reset_optional,
>  	.jumbo_max_len = 10240,
>  	.usrio = &macb_default_usrio,
>  };
> @@ -4751,6 +4750,17 @@ static const struct macb_config zynq_config = {
>  	.usrio = &macb_default_usrio,
>  };
>  
> +static const struct macb_config mpfs_config = {
> +	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE |
> +			MACB_CAPS_JUMBO |
> +			MACB_CAPS_GEM_HAS_PTP,

Except for zynqmp and default_gem_config the rest of the capabilities for
other SoCs are aligned something like this:

+	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE |
+		MACB_CAPS_JUMBO |
+		MACB_CAPS_GEM_HAS_PTP,

To me it looks better to have you caps aligned this way.

Thank you,
Claudiu Beznea

> +	.dma_burst_length = 16,
> +	.clk_init = macb_clk_init,
> +	.init = init_reset_optional,
> +	.usrio = &macb_default_usrio,
> +	.jumbo_max_len = 10240,
> +};
> +
>  static const struct macb_config sama7g5_gem_config = {
>  	.caps = MACB_CAPS_GIGABIT_MODE_AVAILABLE | MACB_CAPS_CLK_HW_CHG |
>  		MACB_CAPS_MIIONRGMII,
> @@ -4787,6 +4797,7 @@ static const struct of_device_id macb_dt_ids[] = {
>  	{ .compatible = "cdns,zynqmp-gem", .data = &zynqmp_config},
>  	{ .compatible = "cdns,zynq-gem", .data = &zynq_config },
>  	{ .compatible = "sifive,fu540-c000-gem", .data = &fu540_c000_config },
> +	{ .compatible = "microchip,mpfs-macb", .data = &mpfs_config },
>  	{ .compatible = "microchip,sama7g5-gem", .data = &sama7g5_gem_config },
>  	{ .compatible = "microchip,sama7g5-emac", .data = &sama7g5_emac_config },
>  	{ /* sentinel */ }