Add Ethernet support for STM32MP13.
STM32MP13 is STM32 SOC with 2 GMACs instances.
GMAC IP version is SNPS 4.20.
GMAC IP configure with 1 RX and 1 TX queue.
DMA HW capability register supported
RX Checksum Offload Engine supported
TX Checksum insertion supported
Wake-Up On Lan supported
TSO supported

Signed-off-by: Christophe Roullier <christophe.roullier@foss.st.com>
---
 .../net/ethernet/stmicro/stmmac/dwmac-stm32.c | 24 +++++++++++++++++--
 1 file changed, 22 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
index 96ba7bc73e823..064f73cbe3b45 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-stm32.c
@@ -104,6 +104,7 @@ struct stm32_ops {
 	int (*parse_data)(struct stm32_dwmac *dwmac,
 			  struct device *dev);
 	bool clk_rx_enable_in_suspend;
+	bool is_mp13;
 	u32 syscfg_clr_off;
 };
 
@@ -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;
 
 	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;
@@ -560,12 +568,24 @@ static struct stm32_ops stm32mp1_dwmac_data = {
 	.resume = stm32mp1_resume,
 	.parse_data = stm32mp1_parse_data,
 	.syscfg_clr_off = 0x44,
+	.is_mp13 = false,
+	.clk_rx_enable_in_suspend = true
+};
+
+static struct stm32_ops stm32mp13_dwmac_data = {
+	.set_mode = stm32mp1_set_mode,
+	.suspend = stm32mp1_suspend,
+	.resume = stm32mp1_resume,
+	.parse_data = stm32mp1_parse_data,
+	.syscfg_clr_off = 0x08,
+	.is_mp13 = true,
 	.clk_rx_enable_in_suspend = true
 };
 
 static const struct of_device_id stm32_dwmac_match[] = {
 	{ .compatible = "st,stm32-dwmac", .data = &stm32mcu_dwmac_data},
 	{ .compatible = "st,stm32mp1-dwmac", .data = &stm32mp1_dwmac_data},
+	{ .compatible = "st,stm32mp13-dwmac", .data = &stm32mp13_dwmac_data},
 	{ }
 };
 MODULE_DEVICE_TABLE(of, stm32_dwmac_match);
-- 
2.25.1

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 .