netdev - Re: [PATCH net-next 1/4] net: stmmac: socfpga: Agilex5 EMAC platform configuration

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Message-ID: <a58f9a1c-a2f7-4c61-838e-7808e157ae25@bootlin.com>
Date: Wed, 29 Oct 2025 16:30:28 +0100
From: Maxime Chevallier <maxime.chevallier@...tlin.com>
To: "G Thomas, Rohan" <rohan.g.thomas@...era.com>,
 Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Richard Cochran <richardcochran@...il.com>,
 Steffen Trumtrar <s.trumtrar@...gutronix.de>
Cc: netdev@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH net-next 1/4] net: stmmac: socfpga: Agilex5 EMAC platform
 configuration

Hi,

On 29/10/2025 15:53, G Thomas, Rohan wrote:
> Hi Maxime,
> 
> On 10/29/2025 7:04 PM, Maxime Chevallier wrote:
>> Hi Rohan,
>>
>> On 29/10/2025 09:06, Rohan G Thomas via B4 Relay wrote:
>>> From: Rohan G Thomas <rohan.g.thomas@...era.com>
>>>
>>> Agilex5 HPS EMAC uses the dwxgmac-3.10a IP, unlike previous socfpga
>>> platforms which use dwmac1000 IP. Due to differences in platform
>>> configuration, Agilex5 requires a distinct setup.
>>>
>>> Introduce a setup_plat_dat() callback in socfpga_dwmac_ops to handle
>>> platform-specific setup. This callback is invoked before
>>> stmmac_dvr_probe() to ensure the platform data is correctly
>>> configured. Also, implemented separate setup_plat_dat() callback for
>>> current socfpga platforms and Agilex5.
>>>
>>> Signed-off-by: Rohan G Thomas <rohan.g.thomas@...era.com>
>>> ---
>>>   .../net/ethernet/stmicro/stmmac/dwmac-socfpga.c    | 53 ++++++++++++++++++----
>>>   1 file changed, 43 insertions(+), 10 deletions(-)
>>>
>>> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
>>> index 2ff5db6d41ca08a1652d57f3eb73923b9a9558bf..3dae4f3c103802ed1c2cd390634bd5473192d4ee 100644
>>> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
>>> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-socfpga.c
>>> @@ -44,6 +44,7 @@
>>>   struct socfpga_dwmac;
>>>   struct socfpga_dwmac_ops {
>>>   	int (*set_phy_mode)(struct socfpga_dwmac *dwmac_priv);
>>> +	void (*setup_plat_dat)(struct socfpga_dwmac *dwmac_priv);
>>>   };
>>>   
>>>   struct socfpga_dwmac {
>>> @@ -441,6 +442,39 @@ static int socfpga_dwmac_init(struct platform_device *pdev, void *bsp_priv)
>>>   	return dwmac->ops->set_phy_mode(dwmac);
>>>   }
>>>   
>>> +static void socfpga_common_plat_dat(struct socfpga_dwmac *dwmac)
>>> +{
>>> +	struct plat_stmmacenet_data *plat_dat = dwmac->plat_dat;
>>> +
>>> +	plat_dat->bsp_priv = dwmac;
>>> +	plat_dat->fix_mac_speed = socfpga_dwmac_fix_mac_speed;
>>> +	plat_dat->init = socfpga_dwmac_init;
>>> +	plat_dat->pcs_init = socfpga_dwmac_pcs_init;
>>> +	plat_dat->pcs_exit = socfpga_dwmac_pcs_exit;
>>> +	plat_dat->select_pcs = socfpga_dwmac_select_pcs;
>>> +}
>>> +
>>> +static void socfpga_gen5_setup_plat_dat(struct socfpga_dwmac *dwmac)
>>> +{
>>> +	struct plat_stmmacenet_data *plat_dat = dwmac->plat_dat;
>>> +
>>> +	socfpga_common_plat_dat(dwmac);
>>> +
>>> +	plat_dat->core_type = DWMAC_CORE_GMAC;
>>> +
>>> +	/* Rx watchdog timer in dwmac is buggy in this hw */
>>> +	plat_dat->riwt_off = 1;
>>> +}
>>> +
>>> +static void socfpga_agilex5_setup_plat_dat(struct socfpga_dwmac *dwmac)
>>> +{
>>> +	struct plat_stmmacenet_data *plat_dat = dwmac->plat_dat;
>>> +
>>> +	socfpga_common_plat_dat(dwmac);
>>
>> I"m not familiar with this device (I only have a Cyclone V on hand), does
>> it still make sense to try to instantiate a Lynx (i.e. Altera TSE) PCS
>> for that IP ?
> 
> AFAIK, yes it is supported by Agilex V device family also.
> https://www.altera.com/products/ip/a1jui0000049uuomam/triple-speed-ethernet-fpga-ip

Ah nice to know, thanks !

this looks correct then :)

Maxime

> 
>>
>> Maxime
>>
> 
> Best Regards,
> Rohan
>