netdev - Re: [net-next 3/3] net: ftgmac100: Support for AST2700

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Message-ID: <20241107133811.3109d98a@fedora.home>
Date: Thu, 7 Nov 2024 13:38:11 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: Jacky Chou <jacky_chou@...eedtech.com>
Cc: <andrew+netdev@...n.ch>, <davem@...emloft.net>, <edumazet@...gle.com>,
 <kuba@...nel.org>, <pabeni@...hat.com>, <robh@...nel.org>,
 <krzk+dt@...nel.org>, <conor+dt@...nel.org>, <p.zabel@...gutronix.de>,
 <ratbert@...aday-tech.com>, <netdev@...r.kernel.org>,
 <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [net-next 3/3] net: ftgmac100: Support for AST2700

Hi,

On Thu, 7 Nov 2024 19:15:00 +0800
Jacky Chou <jacky_chou@...eedtech.com> wrote:

> The AST2700 is the 7th generation SoC from Aspeed, featuring three GPIO
> controllers that are support 64-bit DMA capability.
> Adding features is shown in the following list.
> 1.Support 64-bit DMA
>   Add the high address (63:32) registers for description address and the
>   description field for packet buffer with high address part.
>   These registers and fields in legacy Aspeed SoC are reserved.
>   This 64-bit DMA changing has verified on legacy Aspeed Soc, like
>   AST2600.

Maybe each of these features should be in a dedicated patch ?

> 2.Set RMII pin strap in AST2700 compitable
				  compatible

>   Use bit 20 of MAC 0x50 to represent the pin strap of AST2700 RMII and
>   RGMII. Set to 1 is RMII pin, otherwise is RGMII.
>   This bis is also reserved in legacy Aspeed SoC.
> Signed-off-by: Jacky Chou <jacky_chou@...eedtech.com>

[...]

> @@ -349,6 +354,10 @@ static void ftgmac100_start_hw(struct ftgmac100 *priv)
>  	if (priv->netdev->features & NETIF_F_HW_VLAN_CTAG_RX)
>  		maccr |= FTGMAC100_MACCR_RM_VLAN;
>  
> +	if (of_device_is_compatible(priv->dev->of_node, "aspeed,ast2700-mac") &&
> +	    priv->netdev->phydev->interface == PHY_INTERFACE_MODE_RMII)
> +		maccr |= FTGMAC100_MACCR_RMII_ENABLE;

The driver code takes the assumption that netdev->phydev might be NULL,
I think you should therefore add an extra check here as well before
getting the interface mode.

Thanks,

Maxime