usb: host: xhci-mtk: Simplify supplies handling with regulator_bulk

Remove the custom functions xhci_mtk_ldos_{enable,disable}() by
switching to using regulator_bulk to perform the very same thing,
as the regulators are always either both enabled or both disabled.
Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Link: https://lore.kernel.org/r/20220214111905.77903-1-angelogioacchino.delregno@collabora.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/host/xhci-mtk.c

@@ -401,29 +401,14 @@ static int xhci_mtk_clks_get(struct xhci_hcd_mtk *mtk)
 	return devm_clk_bulk_get_optional(mtk->dev, BULK_CLKS_NUM, clks);
 }
 
-static int xhci_mtk_ldos_enable(struct xhci_hcd_mtk *mtk)
+static int xhci_mtk_vregs_get(struct xhci_hcd_mtk *mtk)
 {
-	int ret;
+	struct regulator_bulk_data *supplies = mtk->supplies;
 
-	ret = regulator_enable(mtk->vbus);
-	if (ret) {
-		dev_err(mtk->dev, "failed to enable vbus\n");
-		return ret;
-	}
-
-	ret = regulator_enable(mtk->vusb33);
-	if (ret) {
-		dev_err(mtk->dev, "failed to enable vusb33\n");
-		regulator_disable(mtk->vbus);
-		return ret;
-	}
-	return 0;
-}
+	supplies[0].supply = "vbus";
+	supplies[1].supply = "vusb33";
 
-static void xhci_mtk_ldos_disable(struct xhci_hcd_mtk *mtk)
-{
-	regulator_disable(mtk->vbus);
-	regulator_disable(mtk->vusb33);
+	return devm_regulator_bulk_get(mtk->dev, BULK_VREGS_NUM, supplies);
 }
 
 static void xhci_mtk_quirks(struct device *dev, struct xhci_hcd *xhci)
@@ -513,17 +498,10 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 		return -ENOMEM;
 
 	mtk->dev = dev;
-	mtk->vbus = devm_regulator_get(dev, "vbus");
-	if (IS_ERR(mtk->vbus)) {
-		dev_err(dev, "fail to get vbus\n");
-		return PTR_ERR(mtk->vbus);
-	}
 
-	mtk->vusb33 = devm_regulator_get(dev, "vusb33");
-	if (IS_ERR(mtk->vusb33)) {
-		dev_err(dev, "fail to get vusb33\n");
-		return PTR_ERR(mtk->vusb33);
-	}
+	ret = xhci_mtk_vregs_get(mtk);
+	if (ret)
+		return dev_err_probe(dev, ret, "Failed to get regulators\n");
 
 	ret = xhci_mtk_clks_get(mtk);
 	if (ret)
@@ -564,7 +542,7 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 	pm_runtime_enable(dev);
 	pm_runtime_get_sync(dev);
 
-	ret = xhci_mtk_ldos_enable(mtk);
+	ret = regulator_bulk_enable(BULK_VREGS_NUM, mtk->supplies);
 	if (ret)
 		goto disable_pm;
 
@@ -673,7 +651,7 @@ static int xhci_mtk_probe(struct platform_device *pdev)
 	clk_bulk_disable_unprepare(BULK_CLKS_NUM, mtk->clks);
 
 disable_ldos:
-	xhci_mtk_ldos_disable(mtk);
+	regulator_bulk_disable(BULK_VREGS_NUM, mtk->supplies);
 
 disable_pm:
 	pm_runtime_put_noidle(dev);
@@ -701,7 +679,7 @@ static int xhci_mtk_remove(struct platform_device *pdev)
 	usb_put_hcd(hcd);
 	xhci_mtk_sch_exit(mtk);
 	clk_bulk_disable_unprepare(BULK_CLKS_NUM, mtk->clks);
-	xhci_mtk_ldos_disable(mtk);
+	regulator_bulk_disable(BULK_VREGS_NUM, mtk->supplies);
 
 	pm_runtime_disable(dev);
 	pm_runtime_put_noidle(dev);

drivers/usb/host/xhci-mtk.h

@@ -11,10 +11,12 @@
 
 #include <linux/clk.h>
 #include <linux/hashtable.h>
+#include <linux/regulator/consumer.h>
 
 #include "xhci.h"
 
 #define BULK_CLKS_NUM	5
+#define BULK_VREGS_NUM	2
 
 /* support at most 64 ep, use 32 size hash table */
 #define SCH_EP_HASH_BITS	5
@@ -150,9 +152,8 @@ struct xhci_hcd_mtk {
 	int num_u3_ports;
 	int u2p_dis_msk;
 	int u3p_dis_msk;
-	struct regulator *vusb33;
-	struct regulator *vbus;
 	struct clk_bulk_data clks[BULK_CLKS_NUM];
+	struct regulator_bulk_data supplies[BULK_VREGS_NUM];
 	unsigned int has_ippc:1;
 	unsigned int lpm_support:1;
 	unsigned int u2_lpm_disable:1;