phy: phy-mtk-tphy: remove unused u3phya_ref clock

The u3phya_ref clock is already moved into sub-node, and
renamed as ref clock, no used anymore now, so remove it,
this can avoid confusion when support new platforms

Signed-off-by: Chunfeng Yun <[e-mail]>
Signed-off-by: Kishon Vijay Abraham I <[e-mail]>

drivers/phy/mediatek/phy-mtk-tphy.c

···
 struct mtk_tphy {
 	struct device *dev;
 	void __iomem *sif_base;	/* only shared sif */
-	/* deprecated, use @ref_clk instead in phy instance */
-	struct clk *u3phya_ref;	/* reference clock of usb3 anolog phy */
 	const struct mtk_phy_pdata *pdata;
 	struct mtk_phy_instance **phys;
 	int nphys;
···
 	struct mtk_tphy *tphy = dev_get_drvdata(phy->dev.parent);
 	int ret;
 
-	ret = clk_prepare_enable(tphy->u3phya_ref);
-	if (ret) {
-		dev_err(tphy->dev, "failed to enable u3phya_ref\n");
-		return ret;
-	}
-
 	ret = clk_prepare_enable(instance->ref_clk);
 	if (ret) {
 		dev_err(tphy->dev, "failed to enable ref_clk\n");
···
 		u2_phy_instance_exit(tphy, instance);
 
 	clk_disable_unprepare(instance->ref_clk);
-	clk_disable_unprepare(tphy->u3phya_ref);
 	return 0;
 }
 
···
 		}
 	}
 
-	/* it's deprecated, make it optional for backward compatibility */
-	tphy->u3phya_ref = devm_clk_get_optional(dev, "u3phya_ref");
-	if (IS_ERR(tphy->u3phya_ref))
-		return PTR_ERR(tphy->u3phya_ref);
-
 	tphy->src_ref_clk = U3P_REF_CLK;
 	tphy->src_coef = U3P_SLEW_RATE_COEF;
 	/* update parameters of slew rate calibrate if exist */
···
 		instance->index = port;
 		phy_set_drvdata(phy, instance);
 		port++;
-
-		/* if deprecated clock is provided, ignore instance's one */
-		if (tphy->u3phya_ref)
-			continue;
 
 		instance->ref_clk = devm_clk_get_optional(&phy->dev, "ref");
 		if (IS_ERR(instance->ref_clk)) {