linux-kernel - [PATCH v2 10/10] phy: qualcomm: eusb2-repeater: Add SMB2370 eUSB2 repeater support

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Message-Id: <20250925005228.4035927-11-wesley.cheng@oss.qualcomm.com>
Date: Wed, 24 Sep 2025 17:52:28 -0700
From: Wesley Cheng <wesley.cheng@....qualcomm.com>
To: krzk+dt@...nel.org, conor+dt@...nel.org, dmitry.baryshkov@....qualcomm.com,
        kishon@...nel.org, vkoul@...nel.org, gregkh@...uxfoundation.org,
        robh@...nel.org
Cc: linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Wesley Cheng <wesley.cheng@....qualcomm.com>
Subject: [PATCH v2 10/10] phy: qualcomm: eusb2-repeater: Add SMB2370 eUSB2 repeater support

Introduce support for the SMB2370 based eUSB2 repeater.  Configure the
proper repeater tuning settings, as if this is not done correctly, it
can lead to instability on the USB2 link, which leads to USB2
enumeration failures, or random disconnects.

Signed-off-by: Wesley Cheng <wesley.cheng@....qualcomm.com>
---
 drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
index 651a12b59bc8..441996480a67 100644
--- a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
+++ b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
@@ -75,6 +75,13 @@ static const struct eusb2_repeater_init_tbl_reg smb2360_init_tbl[] = {
 	{ EUSB2_TUNE_USB2_PREEM, 0x2 },
 };
 
+static const struct eusb2_repeater_init_tbl_reg smb2370_init_tbl[] = {
+	{ EUSB2_TUNE_IUSB2, 0x4 },
+	{ EUSB2_TUNE_SQUELCH_U, 0x3 },
+	{ EUSB2_TUNE_USB2_SLEW, 0x7 },
+	{ EUSB2_TUNE_USB2_PREEM, 0x0 },
+};
+
 static const struct eusb2_repeater_cfg pm8550b_eusb2_cfg = {
 	.init_tbl	= pm8550b_init_tbl,
 	.init_tbl_num	= ARRAY_SIZE(pm8550b_init_tbl),
@@ -97,6 +104,13 @@ static const struct eusb2_repeater_cfg smb2360_eusb2_cfg = {
 	.num_vregs	= ARRAY_SIZE(pm8550b_vreg_l),
 };
 
+static const struct eusb2_repeater_cfg smb2370_eusb2_cfg = {
+	.init_tbl	= smb2370_init_tbl,
+	.init_tbl_num	= ARRAY_SIZE(smb2370_init_tbl),
+	.vreg_list	= pm8550b_vreg_l,
+	.num_vregs	= ARRAY_SIZE(pm8550b_vreg_l),
+};
+
 static int eusb2_repeater_init_vregs(struct eusb2_repeater *rptr)
 {
 	int num = rptr->cfg->num_vregs;
@@ -278,6 +292,10 @@ static const struct of_device_id eusb2_repeater_of_match_table[] = {
 		.compatible = "qcom,smb2360-eusb2-repeater",
 		.data = &smb2360_eusb2_cfg,
 	},
+	{
+		.compatible = "qcom,smb2370-eusb2-repeater",
+		.data = &smb2370_eusb2_cfg,
+	},
 	{ },
 };
 MODULE_DEVICE_TABLE(of, eusb2_repeater_of_match_table);