phy: qcom-qmp-usb: drop multi-PHY support

Each USB QMP PHY device provides just a single UFS PHY. Drop support
for handling multiple child PHYs. Use phy->init_count to check if the
PHY was initialized rather than duplicating this count.
Acked-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Tested-by: Bjorn Andersson <bjorn.andersson@linaro.org> # UFS, PCIe and USB on SC8180X
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20220607213203.2819885-27-dmitry.baryshkov@linaro.orgSigned-off-by: Vinod Koul <vkoul@kernel.org>

drivers/phy/qualcomm/phy-qcom-qmp-usb.c

@@ -1440,8 +1440,6 @@ struct qmp_phy {
  * @vregs: regulator supplies bulk data
  *
  * @phys: array of per-lane phy descriptors
- * @phy_mutex: mutex lock for PHY common block initialization
- * @init_count: phy common block initialization count
  */
 struct qcom_qmp {
 	struct device *dev;
@@ -1452,9 +1450,6 @@ struct qcom_qmp {
 	struct regulator_bulk_data *vregs;
 
 	struct qmp_phy **phys;
-
-	struct mutex phy_mutex;
-	int init_count;
 };
 
 static inline void qphy_setbits(void __iomem *base, u32 offset, u32 val)
@@ -2016,17 +2011,11 @@ static int qcom_qmp_phy_usb_com_init(struct qmp_phy *qphy)
 	void __iomem *dp_com = qmp->dp_com;
 	int ret, i;
 
-	mutex_lock(&qmp->phy_mutex);
-	if (qmp->init_count++) {
-		mutex_unlock(&qmp->phy_mutex);
-		return 0;
-	}
-
 	/* turn on regulator supplies */
 	ret = regulator_bulk_enable(cfg->num_vregs, qmp->vregs);
 	if (ret) {
 		dev_err(qmp->dev, "failed to enable regulators, err=%d\n", ret);
-		goto err_unlock;
+		return ret;
 	}
 
 	for (i = 0; i < cfg->num_resets; i++) {
@@ -2082,8 +2071,6 @@ static int qcom_qmp_phy_usb_com_init(struct qmp_phy *qphy)
 		qphy_setbits(pcs, QPHY_POWER_DOWN_CONTROL,
 			     cfg->pwrdn_ctrl);
 
-	mutex_unlock(&qmp->phy_mutex);
-
 	return 0;
 
 err_assert_reset:
@@ -2091,8 +2078,6 @@ static int qcom_qmp_phy_usb_com_init(struct qmp_phy *qphy)
 		reset_control_assert(qmp->resets[i]);
 err_disable_regulators:
 	regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
-err_unlock:
-	mutex_unlock(&qmp->phy_mutex);
 
 	return ret;
 }
@@ -2103,12 +2088,6 @@ static int qcom_qmp_phy_usb_com_exit(struct qmp_phy *qphy)
 	const struct qmp_phy_cfg *cfg = qphy->cfg;
 	int i = cfg->num_resets;
 
-	mutex_lock(&qmp->phy_mutex);
-	if (--qmp->init_count) {
-		mutex_unlock(&qmp->phy_mutex);
-		return 0;
-	}
-
 	while (--i >= 0)
 		reset_control_assert(qmp->resets[i]);
 
@@ -2116,8 +2095,6 @@ static int qcom_qmp_phy_usb_com_exit(struct qmp_phy *qphy)
 
 	regulator_bulk_disable(cfg->num_vregs, qmp->vregs);
 
-	mutex_unlock(&qmp->phy_mutex);
-
 	return 0;
 }
 
@@ -2332,7 +2309,7 @@ static int __maybe_unused qcom_qmp_phy_usb_runtime_suspend(struct device *dev)
 	if (cfg->type != PHY_TYPE_USB3)
 		return 0;
 
-	if (!qmp->init_count) {
+	if (!qphy->phy->init_count) {
 		dev_vdbg(dev, "PHY not initialized, bailing out\n");
 		return 0;
 	}
@@ -2358,7 +2335,7 @@ static int __maybe_unused qcom_qmp_phy_usb_runtime_resume(struct device *dev)
 	if (cfg->type != PHY_TYPE_USB3)
 		return 0;
 
-	if (!qmp->init_count) {
+	if (!qphy->phy->init_count) {
 		dev_vdbg(dev, "PHY not initialized, bailing out\n");
 		return 0;
 	}
@@ -2673,7 +2650,7 @@ static int qcom_qmp_phy_usb_probe(struct platform_device *pdev)
 	struct phy_provider *phy_provider;
 	void __iomem *serdes;
 	const struct qmp_phy_cfg *cfg = NULL;
-	int num, id, expected_phys;
+	int num, id;
 	int ret;
 
 	qmp = devm_kzalloc(dev, sizeof(*qmp), GFP_KERNEL);
@@ -2700,10 +2677,6 @@ static int qcom_qmp_phy_usb_probe(struct platform_device *pdev)
 			return PTR_ERR(qmp->dp_com);
 	}
 
-	expected_phys = cfg->nlanes;
-
-	mutex_init(&qmp->phy_mutex);
-
 	ret = qcom_qmp_phy_usb_clk_init(dev, cfg);
 	if (ret)
 		return ret;
@@ -2722,7 +2695,7 @@ static int qcom_qmp_phy_usb_probe(struct platform_device *pdev)
 
 	num = of_get_available_child_count(dev->of_node);
 	/* do we have a rogue child node ? */
-	if (num > expected_phys)
+	if (num > 1)
 		return -EINVAL;
 
 	qmp->phys = devm_kcalloc(dev, num, sizeof(*qmp->phys), GFP_KERNEL);