linux-kernel - Re: [PATCH v5 08/12] net: stmmac: dwmac-stm32: add management of stm32mp13 for stm32

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Message-ID: <6f44537a-3d60-46f5-a159-919cc2a144ec@denx.de>
Date: Fri, 7 Jun 2024 14:48:14 +0200
From: Marek Vasut <marex@...x.de>
To: Christophe Roullier <christophe.roullier@...s.st.com>,
 "David S . Miller" <davem@...emloft.net>, Eric Dumazet
 <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
 Paolo Abeni <pabeni@...hat.com>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Richard Cochran <richardcochran@...il.com>, Jose Abreu
 <joabreu@...opsys.com>, Liam Girdwood <lgirdwood@...il.com>,
 Mark Brown <broonie@...nel.org>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org,
 linux-stm32@...md-mailman.stormreply.com,
 linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 08/12] net: stmmac: dwmac-stm32: add management of
 stm32mp13 for stm32

On 6/7/24 11:57 AM, Christophe Roullier wrote:

[...]

> @@ -224,11 +225,18 @@ static int stm32mp1_configure_pmcr(struct plat_stmmacenet_data *plat_dat)
>   {
>   	struct stm32_dwmac *dwmac = plat_dat->bsp_priv;
>   	u32 reg = dwmac->mode_reg;
> -	int val;
> +	int val = 0;

Is the initialization really needed ? It seems the switch-case below 
does always initialize $val .

>   	switch (plat_dat->mac_interface) {
>   	case PHY_INTERFACE_MODE_MII:
> -		val = SYSCFG_PMCR_ETH_SEL_MII;
> +		/*
> +		 * STM32MP15xx supports both MII and GMII, STM32MP13xx MII only.
> +		 * SYSCFG_PMCSETR ETH_SELMII is present only on STM32MP15xx and
> +		 * acts as a selector between 0:GMII and 1:MII. As STM32MP13xx
> +		 * supports only MII, ETH_SELMII is not present.
> +		 */
> +		if (!dwmac->ops->is_mp13)  /* Select MII mode on STM32MP15xx */
> +			val |= SYSCFG_PMCR_ETH_SEL_MII;
>   		break;
>   	case PHY_INTERFACE_MODE_GMII:
>   		val = SYSCFG_PMCR_ETH_SEL_GMII;

[...]

This way of adding MP13 support definitely looks much better.

Also, split the series, drivers/ stuff for netdev (and make sure to 
include the net-next patch prefix , git send-email 
--subject-prefix="net-next,PATCH") , DTs for linux-arm-kernel , config 
patch also for linux-arm-kernel .