net: stmmac: replace the en_tx_lpi_clockgating field with a flag

Drop the boolean field of the plat_stmmacenet_data structure in favor of a
simple bitfield flag.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
Link: https://lore.kernel.org/r/20230710090001.303225-13-brgl@bgdev.pl
Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -421,7 +421,7 @@ static int stmmac_enable_eee_mode(struct stmmac_priv *priv)
 	/* Check and enter in LPI mode */
 	if (!priv->tx_path_in_lpi_mode)
 		stmmac_set_eee_mode(priv, priv->hw,
-				priv->plat->en_tx_lpi_clockgating);
+			priv->plat->flags & STMMAC_FLAG_EN_TX_LPI_CLOCKGATING);
 	return 0;
 }
 

drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

@@ -466,8 +466,8 @@ stmmac_probe_config_dt(struct platform_device *pdev, u8 *mac)
 	plat->force_sf_dma_mode =
 		of_property_read_bool(np, "snps,force_sf_dma_mode");
 
-	plat->en_tx_lpi_clockgating =
-		of_property_read_bool(np, "snps,en-tx-lpi-clockgating");
+	if (of_property_read_bool(np, "snps,en-tx-lpi-clockgating"))
+		plat->flags |= STMMAC_FLAG_EN_TX_LPI_CLOCKGATING;
 
 	/* Set the maxmtu to a default of JUMBO_LEN in case the
 	 * parameter is not present in the device tree.

include/linux/stmmac.h

@@ -215,6 +215,7 @@ struct dwmac4_addrs {
 #define STMMAC_FLAG_EXT_SNAPSHOT_EN		BIT(8)
 #define STMMAC_FLAG_INT_SNAPSHOT_EN		BIT(9)
 #define STMMAC_FLAG_RX_CLK_RUNS_IN_LPI		BIT(10)
+#define STMMAC_FLAG_EN_TX_LPI_CLOCKGATING	BIT(11)
 
 struct plat_stmmacenet_data {
 	int bus_id;
@@ -280,7 +281,6 @@ struct plat_stmmacenet_data {
 	int has_gmac4;
 	int rss_en;
 	int mac_port_sel_speed;
-	bool en_tx_lpi_clockgating;
 	int has_xgmac;
 	u8 vlan_fail_q;
 	unsigned int eee_usecs_rate;