[PATCH v2 0/4] EUSB2 repeater init sequence override

[PATCH v2 0/4] EUSB2 repeater init sequence override

[Konrad Dybcio]

The EUSB2 repeater goes through a tuning sequence as part of its
initialization. This series ensures the tuning is "clean" and can be
overridden for devices that need it.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
Changes in v2:
- Change register names to something more human readable in bindings (RobH)
- Make "Zero out untouched tuning regs" actually do what it says
- Link to v1: https://lore.kernel.org/r/20230830-topic-eusb2_override-v1-0-ab23825385a8@linaro.org

---
Konrad Dybcio (4):
      dt-bindings: phy: qcom,snps-eusb2-repeater: Add magic tuning overrides
      phy: qualcomm: phy-qcom-eusb2-repeater: Use regmap_fields
      phy: qualcomm: phy-qcom-eusb2-repeater: Zero out untouched tuning regs
      phy: qualcomm: phy-qcom-eusb2-repeater: Add tuning overrides

 .../bindings/phy/qcom,snps-eusb2-repeater.yaml     |  21 +++
 drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c     | 146 ++++++++++++++++-----
 2 files changed, 132 insertions(+), 35 deletions(-)
---
base-commit: 3c13c772fc233a10342c8e1605ff0855dfdf0c89
change-id: 20230830-topic-eusb2_override-aa66df9ca641

Best regards,
-- 
Konrad Dybcio <konrad.dybcio@linaro.org>

[PATCH v2 1/4] dt-bindings: phy: qcom,snps-eusb2-repeater: Add magic tuning overrides

[Konrad Dybcio]

The EUSB2 repeater requires some alterations to its init sequence,
depending on board design.

Add support for making the necessary changes to that sequence to make USB
functional on SM8550-based Xperia 1 V.

They all have lackluster description due to lack of information.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 .../bindings/phy/qcom,snps-eusb2-repeater.yaml      | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
index 029569d5fcf3..24c733c10e0e 100644
--- a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
+++ b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
@@ -32,6 +32,27 @@ properties:
 
   vdd3-supply: true
 
+  qcom,tune-usb2-disc-thres:
+    $ref: /schemas/types.yaml#/definitions/uint8
+    description: High-Speed disconnect threshold
+    minimum: 0
+    maximum: 7
+    default: 0
+
+  qcom,tune-usb2-amplitude:
+    $ref: /schemas/types.yaml#/definitions/uint8
+    description: High-Speed trasmit amplitude
+    minimum: 0
+    maximum: 15
+    default: 8
+
+  qcom,tune-usb2-preem:
+    $ref: /schemas/types.yaml#/definitions/uint8
+    description: High-Speed TX pre-emphasis tuning
+    minimum: 0
+    maximum: 7
+    default: 5
+
 required:
   - compatible
   - reg

-- 
2.42.0

[PATCH v2 2/4] phy: qualcomm: phy-qcom-eusb2-repeater: Use regmap_fields

[Konrad Dybcio]

Switch to regmap_fields, so that the values written into registers are
sanitized by their explicit sizes and the different registers are
structured in an iterable object to make external changes to the init
sequence simpler.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c | 91 +++++++++++++++++---------
 1 file changed, 61 insertions(+), 30 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
index 52c275fbb2a1..7561da01e633 100644
--- a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
+++ b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
@@ -28,14 +28,42 @@
 #define EUSB2_TUNE_SQUELCH_U		0x54
 #define EUSB2_TUNE_USB2_PREEM		0x57
 
-#define QCOM_EUSB2_REPEATER_INIT_CFG(o, v)	\
+#define QCOM_EUSB2_REPEATER_INIT_CFG(r, v)	\
 	{					\
-		.offset = o,			\
+		.reg = r,			\
 		.val = v,			\
 	}
 
+enum reg_fields {
+	F_TUNE_USB2_PREEM,
+	F_TUNE_SQUELCH_U,
+	F_TUNE_IUSB2,
+	F_NUM_TUNE_FIELDS,
+
+	F_FORCE_VAL_5 = F_NUM_TUNE_FIELDS,
+	F_FORCE_EN_5,
+
+	F_EN_CTL1,
+
+	F_RPTR_STATUS,
+	F_NUM_FIELDS,
+};
+
+static struct reg_field eusb2_repeater_tune_reg_fields[F_NUM_FIELDS] = {
+	[F_TUNE_USB2_PREEM] = REG_FIELD(EUSB2_TUNE_USB2_PREEM, 0, 2),
+	[F_TUNE_SQUELCH_U] = REG_FIELD(EUSB2_TUNE_SQUELCH_U, 0, 2),
+	[F_TUNE_IUSB2] = REG_FIELD(EUSB2_TUNE_IUSB2, 0, 3),
+
+	[F_FORCE_VAL_5] = REG_FIELD(EUSB2_FORCE_VAL_5, 0, 7),
+	[F_FORCE_EN_5] = REG_FIELD(EUSB2_FORCE_EN_5, 0, 7),
+
+	[F_EN_CTL1] = REG_FIELD(EUSB2_EN_CTL1, 0, 7),
+
+	[F_RPTR_STATUS] = REG_FIELD(EUSB2_RPTR_STATUS, 0, 7),
+};
+
 struct eusb2_repeater_init_tbl {
-	unsigned int offset;
+	unsigned int reg;
 	unsigned int val;
 };
 
@@ -48,11 +76,10 @@ struct eusb2_repeater_cfg {
 
 struct eusb2_repeater {
 	struct device *dev;
-	struct regmap *regmap;
+	struct regmap_field *regs[F_NUM_FIELDS];
 	struct phy *phy;
 	struct regulator_bulk_data *vregs;
 	const struct eusb2_repeater_cfg *cfg;
-	u16 base;
 	enum phy_mode mode;
 };
 
@@ -61,9 +88,9 @@ static const char * const pm8550b_vreg_l[] = {
 };
 
 static const struct eusb2_repeater_init_tbl pm8550b_init_tbl[] = {
-	QCOM_EUSB2_REPEATER_INIT_CFG(EUSB2_TUNE_IUSB2, 0x8),
-	QCOM_EUSB2_REPEATER_INIT_CFG(EUSB2_TUNE_SQUELCH_U, 0x3),
-	QCOM_EUSB2_REPEATER_INIT_CFG(EUSB2_TUNE_USB2_PREEM, 0x5),
+	QCOM_EUSB2_REPEATER_INIT_CFG(F_TUNE_IUSB2, 0x8),
+	QCOM_EUSB2_REPEATER_INIT_CFG(F_TUNE_SQUELCH_U, 0x3),
+	QCOM_EUSB2_REPEATER_INIT_CFG(F_TUNE_USB2_PREEM, 0x5),
 };
 
 static const struct eusb2_repeater_cfg pm8550b_eusb2_cfg = {
@@ -93,7 +120,6 @@ static int eusb2_repeater_init(struct phy *phy)
 {
 	struct eusb2_repeater *rptr = phy_get_drvdata(phy);
 	const struct eusb2_repeater_init_tbl *init_tbl = rptr->cfg->init_tbl;
-	int num = rptr->cfg->init_tbl_num;
 	u32 val;
 	int ret;
 	int i;
@@ -102,17 +128,14 @@ static int eusb2_repeater_init(struct phy *phy)
 	if (ret)
 		return ret;
 
-	regmap_update_bits(rptr->regmap, rptr->base + EUSB2_EN_CTL1,
-			   EUSB2_RPTR_EN, EUSB2_RPTR_EN);
+	regmap_field_update_bits(rptr->regs[F_EN_CTL1], EUSB2_RPTR_EN, EUSB2_RPTR_EN);
 
-	for (i = 0; i < num; i++)
-		regmap_update_bits(rptr->regmap,
-				   rptr->base + init_tbl[i].offset,
-				   init_tbl[i].val, init_tbl[i].val);
+	for (i = 0; i < rptr->cfg->init_tbl_num; i++)
+		regmap_field_update_bits(rptr->regs[init_tbl[i].reg],
+					 init_tbl[i].val, init_tbl[i].val);
 
-	ret = regmap_read_poll_timeout(rptr->regmap,
-				       rptr->base + EUSB2_RPTR_STATUS, val,
-				       val & RPTR_OK, 10, 5);
+	ret = regmap_field_read_poll_timeout(rptr->regs[F_RPTR_STATUS],
+					     val, val & RPTR_OK, 10, 5);
 	if (ret)
 		dev_err(rptr->dev, "initialization timed-out\n");
 
@@ -131,10 +154,10 @@ static int eusb2_repeater_set_mode(struct phy *phy,
 		 * per eUSB 1.2 Spec. Below implement software workaround until
 		 * PHY and controller is fixing seen observation.
 		 */
-		regmap_update_bits(rptr->regmap, rptr->base + EUSB2_FORCE_EN_5,
-				   F_CLK_19P2M_EN, F_CLK_19P2M_EN);
-		regmap_update_bits(rptr->regmap, rptr->base + EUSB2_FORCE_VAL_5,
-				   V_CLK_19P2M_EN, V_CLK_19P2M_EN);
+		regmap_field_update_bits(rptr->regs[F_FORCE_EN_5],
+					 F_CLK_19P2M_EN, F_CLK_19P2M_EN);
+		regmap_field_update_bits(rptr->regs[F_FORCE_VAL_5],
+					 V_CLK_19P2M_EN, V_CLK_19P2M_EN);
 		break;
 	case PHY_MODE_USB_DEVICE:
 		/*
@@ -143,10 +166,10 @@ static int eusb2_repeater_set_mode(struct phy *phy,
 		 * repeater doesn't clear previous value due to shared
 		 * regulators (say host <-> device mode switch).
 		 */
-		regmap_update_bits(rptr->regmap, rptr->base + EUSB2_FORCE_EN_5,
-				   F_CLK_19P2M_EN, 0);
-		regmap_update_bits(rptr->regmap, rptr->base + EUSB2_FORCE_VAL_5,
-				   V_CLK_19P2M_EN, 0);
+		regmap_field_update_bits(rptr->regs[F_FORCE_EN_5],
+					 F_CLK_19P2M_EN, 0);
+		regmap_field_update_bits(rptr->regs[F_FORCE_VAL_5],
+					 V_CLK_19P2M_EN, 0);
 		break;
 	default:
 		return -EINVAL;
@@ -175,8 +198,9 @@ static int eusb2_repeater_probe(struct platform_device *pdev)
 	struct device *dev = &pdev->dev;
 	struct phy_provider *phy_provider;
 	struct device_node *np = dev->of_node;
+	struct regmap *regmap;
+	int i, ret;
 	u32 res;
-	int ret;
 
 	rptr = devm_kzalloc(dev, sizeof(*rptr), GFP_KERNEL);
 	if (!rptr)
@@ -189,15 +213,22 @@ static int eusb2_repeater_probe(struct platform_device *pdev)
 	if (!rptr->cfg)
 		return -EINVAL;
 
-	rptr->regmap = dev_get_regmap(dev->parent, NULL);
-	if (!rptr->regmap)
+	regmap = dev_get_regmap(dev->parent, NULL);
+	if (!regmap)
 		return -ENODEV;
 
 	ret = of_property_read_u32(np, "reg", &res);
 	if (ret < 0)
 		return ret;
 
-	rptr->base = res;
+	for (i = 0; i < F_NUM_FIELDS; i++)
+		eusb2_repeater_tune_reg_fields[i].reg += res;
+
+	ret = devm_regmap_field_bulk_alloc(dev, regmap, rptr->regs,
+					   eusb2_repeater_tune_reg_fields,
+					   F_NUM_FIELDS);
+	if (ret)
+		return ret;
 
 	ret = eusb2_repeater_init_vregs(rptr);
 	if (ret < 0) {

-- 
2.42.0

[PATCH v2 3/4] phy: qualcomm: phy-qcom-eusb2-repeater: Zero out untouched tuning regs

[Konrad Dybcio]

The vendor kernel zeroes out all tuning data outside the init sequence
as part of initialization. Follow suit to avoid UB.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c | 58 +++++++++++++++++++-------
 1 file changed, 44 insertions(+), 14 deletions(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
index 7561da01e633..d4fb85c20eb0 100644
--- a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
+++ b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
@@ -24,9 +24,18 @@
 #define EUSB2_FORCE_VAL_5		0xeD
 #define V_CLK_19P2M_EN			BIT(6)
 
+#define EUSB2_TUNE_USB2_CROSSOVER	0x50
 #define EUSB2_TUNE_IUSB2		0x51
+#define EUSB2_TUNE_RES_FSDIF		0x52
+#define EUSB2_TUNE_HSDISC		0x53
 #define EUSB2_TUNE_SQUELCH_U		0x54
+#define EUSB2_TUNE_USB2_SLEW		0x55
+#define EUSB2_TUNE_USB2_EQU		0x56
 #define EUSB2_TUNE_USB2_PREEM		0x57
+#define EUSB2_TUNE_USB2_HS_COMP_CUR	0x58
+#define EUSB2_TUNE_EUSB_SLEW		0x59
+#define EUSB2_TUNE_EUSB_EQU		0x5A
+#define EUSB2_TUNE_EUSB_HS_COMP_CUR	0x5B
 
 #define QCOM_EUSB2_REPEATER_INIT_CFG(r, v)	\
 	{					\
@@ -35,9 +44,18 @@
 	}
 
 enum reg_fields {
+	F_TUNE_EUSB_HS_COMP_CUR,
+	F_TUNE_EUSB_EQU,
+	F_TUNE_EUSB_SLEW,
+	F_TUNE_USB2_HS_COMP_CUR,
 	F_TUNE_USB2_PREEM,
+	F_TUNE_USB2_EQU,
+	F_TUNE_USB2_SLEW,
 	F_TUNE_SQUELCH_U,
+	F_TUNE_HSDISC,
+	F_TUNE_RES_FSDIF,
 	F_TUNE_IUSB2,
+	F_TUNE_USB2_CROSSOVER,
 	F_NUM_TUNE_FIELDS,
 
 	F_FORCE_VAL_5 = F_NUM_TUNE_FIELDS,
@@ -50,9 +68,18 @@ enum reg_fields {
 };
 
 static struct reg_field eusb2_repeater_tune_reg_fields[F_NUM_FIELDS] = {
+	[F_TUNE_EUSB_HS_COMP_CUR] = REG_FIELD(EUSB2_TUNE_EUSB_HS_COMP_CUR, 0, 1),
+	[F_TUNE_EUSB_EQU] = REG_FIELD(EUSB2_TUNE_EUSB_EQU, 0, 1),
+	[F_TUNE_EUSB_SLEW] = REG_FIELD(EUSB2_TUNE_EUSB_SLEW, 0, 1),
+	[F_TUNE_USB2_HS_COMP_CUR] = REG_FIELD(EUSB2_TUNE_USB2_HS_COMP_CUR, 0, 1),
 	[F_TUNE_USB2_PREEM] = REG_FIELD(EUSB2_TUNE_USB2_PREEM, 0, 2),
+	[F_TUNE_USB2_EQU] = REG_FIELD(EUSB2_TUNE_USB2_EQU, 0, 1),
+	[F_TUNE_USB2_SLEW] = REG_FIELD(EUSB2_TUNE_USB2_SLEW, 0, 1),
 	[F_TUNE_SQUELCH_U] = REG_FIELD(EUSB2_TUNE_SQUELCH_U, 0, 2),
+	[F_TUNE_HSDISC] = REG_FIELD(EUSB2_TUNE_HSDISC, 0, 2),
+	[F_TUNE_RES_FSDIF] = REG_FIELD(EUSB2_TUNE_RES_FSDIF, 0, 2),
 	[F_TUNE_IUSB2] = REG_FIELD(EUSB2_TUNE_IUSB2, 0, 3),
+	[F_TUNE_USB2_CROSSOVER] = REG_FIELD(EUSB2_TUNE_USB2_CROSSOVER, 0, 2),
 
 	[F_FORCE_VAL_5] = REG_FIELD(EUSB2_FORCE_VAL_5, 0, 7),
 	[F_FORCE_EN_5] = REG_FIELD(EUSB2_FORCE_EN_5, 0, 7),
@@ -62,13 +89,8 @@ static struct reg_field eusb2_repeater_tune_reg_fields[F_NUM_FIELDS] = {
 	[F_RPTR_STATUS] = REG_FIELD(EUSB2_RPTR_STATUS, 0, 7),
 };
 
-struct eusb2_repeater_init_tbl {
-	unsigned int reg;
-	unsigned int val;
-};
-
 struct eusb2_repeater_cfg {
-	const struct eusb2_repeater_init_tbl *init_tbl;
+	const u32 *init_tbl;
 	int init_tbl_num;
 	const char * const *vreg_list;
 	int num_vregs;
@@ -87,10 +109,10 @@ static const char * const pm8550b_vreg_l[] = {
 	"vdd18", "vdd3",
 };
 
-static const struct eusb2_repeater_init_tbl pm8550b_init_tbl[] = {
-	QCOM_EUSB2_REPEATER_INIT_CFG(F_TUNE_IUSB2, 0x8),
-	QCOM_EUSB2_REPEATER_INIT_CFG(F_TUNE_SQUELCH_U, 0x3),
-	QCOM_EUSB2_REPEATER_INIT_CFG(F_TUNE_USB2_PREEM, 0x5),
+static const u32 pm8550b_init_tbl[F_NUM_TUNE_FIELDS] = {
+	[F_TUNE_IUSB2] = 0x8,
+	[F_TUNE_SQUELCH_U] = 0x3,
+	[F_TUNE_USB2_PREEM] = 0x5,
 };
 
 static const struct eusb2_repeater_cfg pm8550b_eusb2_cfg = {
@@ -118,8 +140,9 @@ static int eusb2_repeater_init_vregs(struct eusb2_repeater *rptr)
 
 static int eusb2_repeater_init(struct phy *phy)
 {
+	struct reg_field *regfields = eusb2_repeater_tune_reg_fields;
 	struct eusb2_repeater *rptr = phy_get_drvdata(phy);
-	const struct eusb2_repeater_init_tbl *init_tbl = rptr->cfg->init_tbl;
+	const u32 *init_tbl = rptr->cfg->init_tbl;
 	u32 val;
 	int ret;
 	int i;
@@ -130,9 +153,16 @@ static int eusb2_repeater_init(struct phy *phy)
 
 	regmap_field_update_bits(rptr->regs[F_EN_CTL1], EUSB2_RPTR_EN, EUSB2_RPTR_EN);
 
-	for (i = 0; i < rptr->cfg->init_tbl_num; i++)
-		regmap_field_update_bits(rptr->regs[init_tbl[i].reg],
-					 init_tbl[i].val, init_tbl[i].val);
+	for (i = 0; i < F_NUM_TUNE_FIELDS; i++) {
+		if (init_tbl[i]) {
+			regmap_field_update_bits(rptr->regs[i], init_tbl[i], init_tbl[i]);
+		} else {
+			/* Write 0 if there's no value set */
+			u32 mask = GENMASK(regfields[i].msb, regfields[i].lsb);
+
+			regmap_field_update_bits(rptr->regs[i], mask, 0);
+		}
+	}
 
 	ret = regmap_field_read_poll_timeout(rptr->regs[F_RPTR_STATUS],
 					     val, val & RPTR_OK, 10, 5);

-- 
2.42.0

[PATCH v2 4/4] phy: qualcomm: phy-qcom-eusb2-repeater: Add tuning overrides

[Konrad Dybcio]

There are devices in the wild, like the Sony Xperia 1 V that *require*
different tuning than the base design for USB to work.

Add support for overriding the necessary tuning values.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
index d4fb85c20eb0..a623f092b11f 100644
--- a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
+++ b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
@@ -142,7 +142,9 @@ static int eusb2_repeater_init(struct phy *phy)
 {
 	struct reg_field *regfields = eusb2_repeater_tune_reg_fields;
 	struct eusb2_repeater *rptr = phy_get_drvdata(phy);
-	const u32 *init_tbl = rptr->cfg->init_tbl;
+	struct device_node *np = rptr->dev->of_node;
+	u32 init_tbl[F_NUM_TUNE_FIELDS] = { 0 };
+	u8 override;
 	u32 val;
 	int ret;
 	int i;
@@ -163,6 +165,19 @@ static int eusb2_repeater_init(struct phy *phy)
 			regmap_field_update_bits(rptr->regs[i], mask, 0);
 		}
 	}
+	memcpy(init_tbl, rptr->cfg->init_tbl, sizeof(init_tbl));
+
+	if (!of_property_read_u8(np, "qcom,tune-usb2-amplitude", &override))
+		init_tbl[F_TUNE_IUSB2] = override;
+
+	if (!of_property_read_u8(np, "qcom,tune-usb2-disc-thres", &override))
+		init_tbl[F_TUNE_HSDISC] = override;
+
+	if (!of_property_read_u8(np, "qcom,tune-usb2-preem", &override))
+		init_tbl[F_TUNE_USB2_PREEM] = override;
+
+	for (i = 0; i < F_NUM_TUNE_FIELDS; i++)
+		regmap_field_update_bits(rptr->regs[i], init_tbl[i], init_tbl[i]);
 
 	ret = regmap_field_read_poll_timeout(rptr->regs[F_RPTR_STATUS],
 					     val, val & RPTR_OK, 10, 5);

-- 
2.42.0

Re: [PATCH v2 1/4] dt-bindings: phy: qcom,snps-eusb2-repeater: Add magic tuning overrides

[Rob Herring]

On Wed, Sep 13, 2023 at 11:53:23AM +0200, Konrad Dybcio wrote:
> The EUSB2 repeater requires some alterations to its init sequence,
> depending on board design.
> 
> Add support for making the necessary changes to that sequence to make USB
> functional on SM8550-based Xperia 1 V.
> 
> They all have lackluster description due to lack of information.
> 
> Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
> ---
>  .../bindings/phy/qcom,snps-eusb2-repeater.yaml      | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> index 029569d5fcf3..24c733c10e0e 100644
> --- a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> +++ b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> @@ -32,6 +32,27 @@ properties:
>  
>    vdd3-supply: true
>  
> +  qcom,tune-usb2-disc-thres:
> +    $ref: /schemas/types.yaml#/definitions/uint8
> +    description: High-Speed disconnect threshold
> +    minimum: 0
> +    maximum: 7
> +    default: 0
> +
> +  qcom,tune-usb2-amplitude:
> +    $ref: /schemas/types.yaml#/definitions/uint8
> +    description: High-Speed trasmit amplitude
> +    minimum: 0
> +    maximum: 15
> +    default: 8
> +
> +  qcom,tune-usb2-preem:
> +    $ref: /schemas/types.yaml#/definitions/uint8
> +    description: High-Speed TX pre-emphasis tuning
> +    minimum: 0
> +    maximum: 7
> +    default: 5

For what it is worth, the mediatek,tphy.yaml binding has the same 
properties...

Acked-by: Rob Herring <robh@kernel.org>

Re: [PATCH v2 0/4] EUSB2 repeater init sequence override

[Vinod Koul]

On Wed, 13 Sep 2023 11:53:22 +0200, Konrad Dybcio wrote:
> The EUSB2 repeater goes through a tuning sequence as part of its
> initialization. This series ensures the tuning is "clean" and can be
> overridden for devices that need it.
> 
> 

Applied, thanks!

[1/4] dt-bindings: phy: qcom,snps-eusb2-repeater: Add magic tuning overrides
      commit: 2da73b4e0cf1d9847483fe474ce27af987bfb614
[2/4] phy: qualcomm: phy-qcom-eusb2-repeater: Use regmap_fields
      commit: dcc8a942852f00845e75c49ca8a7a6865d6b669d
[3/4] phy: qualcomm: phy-qcom-eusb2-repeater: Zero out untouched tuning regs
      commit: af1c6ec341c3a1cc396784b2ce4619aec7be3e34
[4/4] phy: qualcomm: phy-qcom-eusb2-repeater: Add tuning overrides
      commit: 05733bd60f7aa4f260a2837574555bbd3b847cca

Best regards,
-- 
~Vinod