Re: [PATCH net-next v2 1/5] net: stmmac: Add common internal RGMII delay handling

[Maxime Chevallier]

Hi,

On 9/7/26 09:46, Jia Wang wrote:
> Some DWMAC integrations add fixed RGMII clock delays internally.
> Glue drivers need to account for these delays before passing the
> interface mode to the PHY.
> 
> Add TX and RX delay capability flags to the common platform data.
> Apply phy_fix_phy_mode_for_mac_delays() in stmmac_pltfr_probe() when
> either capability is present.
> 
> This lets glue drivers describe the MAC capabilities without
> duplicating the interface-mode validation and conversion.
> 
> Signed-off-by: Jia Wang <wangjia@xxxxxxxxxxxxx>
> ---
>  drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 11 +++++++++++
>  include/linux/stmmac.h                                |  2 ++
>  2 files changed, 13 insertions(+)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> index 6128ed1bd521..93b9af203a18 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
> @@ -16,6 +16,7 @@
>  #include <linux/of.h>
>  #include <linux/of_net.h>
>  #include <linux/of_mdio.h>
> +#include <linux/phy.h>
>  
>  #include "stmmac.h"
>  #include "stmmac_platform.h"
> @@ -847,6 +848,16 @@ int stmmac_pltfr_probe(struct platform_device *pdev,
>  		       struct plat_stmmacenet_data *plat,
>  		       struct stmmac_resources *res)
>  {
> +	if (plat->has_internal_tx_delay || plat->has_internal_rx_delay) {
> +		plat->phy_interface =
> +			phy_fix_phy_mode_for_mac_delays(plat->phy_interface,
> +							plat->has_internal_tx_delay,
> +							plat->has_internal_rx_delay);
> +		if (plat->phy_interface == PHY_INTERFACE_MODE_NA)
> +			return dev_err_probe(&pdev->dev, -EINVAL,
> +					     "unsupported phy interface mode\n");
> +	}
> +

Seems good, the default values should be false hence this condition won't be taken,

Reviewed-by: Maxime Chevallier <maxime.chevallier@xxxxxxxxxxx>

Maxime