[PATCH v3 0/3] Add eusb2 repeater squelch detect parameter override

[PATCH v3 0/3] Add eusb2 repeater squelch detect parameter override

[Krishna Kurapati]

Add support for eusb2 repeater squelch detect parameter override via DT.

Squelch detect parameter adjusts the voltage level for the threshold used
to detect valid high-speed data.

Changes in v3:
- Moved status property to end of repeater node.
- Updated commit text as per comments received in bindings patch.
- Retained Krzysztof and Abel RB tags (since its upating commit text adding
  information in bindings code and moving status property in dt code)

Link to v2:
https://lore.kernel.org/all/20251204044644.3072086-1-krishna.kurapati@oss.qualcomm.com/

Changes in v2:
- Modified logic to write to squelch related register in driver code
- Added multipleOf property in bindings to reflect values can be multiple
  of 1000.

Link to v1:
https://lore.kernel.org/all/20251203083629.2395451-1-krishna.kurapati@oss.qualcomm.com/

Krishna Kurapati (3):
  dt-bindings: phy: qcom,snps-eusb2-repeater: Add squelch param update
  phy: qualcomm: phy-qcom-eusb2-repeater: Add squelch detect param
    update
  arm64: dts: qcom: sm8750-mtp: Add eusb2 repeater tuning parameters

 .../phy/qcom,snps-eusb2-repeater.yaml         |  8 +++++++
 arch/arm64/boot/dts/qcom/sm8750-mtp.dts       |  6 ++++-
 .../phy/qualcomm/phy-qcom-eusb2-repeater.c    | 22 +++++++++++++++++++
 3 files changed, 35 insertions(+), 1 deletion(-)

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[PATCH v3 1/3] dt-bindings: phy: qcom,snps-eusb2-repeater: Add squelch param update

[Krishna Kurapati]

Add squelch detect parameter update for synopsys eusb2 repeater. The
values (indicated in basis-points) depict a percentage change with
respect to the nominal value.

Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
---
 .../devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
index 5bf0d6c9c025..f2afcf0e986a 100644
--- a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
+++ b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
@@ -59,6 +59,14 @@ properties:
     minimum: 0
     maximum: 7
 
+  qcom,squelch-detector-bp:
+    description:
+      This adjusts the voltage level for the threshold used to detect valid
+      high-speed data.
+    minimum: -6000
+    maximum: 1000
+    multipleOf: 1000
+
 required:
   - compatible
   - reg
-- 
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Re: [PATCH v3 1/3] dt-bindings: phy: qcom,snps-eusb2-repeater: Add squelch param update

[Vinod Koul]

On 19-12-25, 23:01, Krishna Kurapati wrote:
> Add squelch detect parameter update for synopsys eusb2 repeater. The
> values (indicated in basis-points) depict a percentage change with
> respect to the nominal value.
> 
> Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
> ---
>  .../devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml | 8 ++++++++
>  1 file changed, 8 insertions(+)
> 
> diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> index 5bf0d6c9c025..f2afcf0e986a 100644
> --- a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> +++ b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> @@ -59,6 +59,14 @@ properties:
>      minimum: 0
>      maximum: 7
>  
> +  qcom,squelch-detector-bp:
> +    description:
> +      This adjusts the voltage level for the threshold used to detect valid
> +      high-speed data.
> +    minimum: -6000

6000Volts, mV, can you please document the units?

> +    maximum: 1000
> +    multipleOf: 1000
> +
>  required:
>    - compatible
>    - reg
> -- 
> 2.34.1

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Re: [PATCH v3 1/3] dt-bindings: phy: qcom,snps-eusb2-repeater: Add squelch param update

[Krzysztof Kozlowski]

On 23/12/2025 15:11, Vinod Koul wrote:
> On 19-12-25, 23:01, Krishna Kurapati wrote:
>> Add squelch detect parameter update for synopsys eusb2 repeater. The
>> values (indicated in basis-points) depict a percentage change with
>> respect to the nominal value.
>>
>> Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
>> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
>> ---
>>  .../devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml | 8 ++++++++
>>  1 file changed, 8 insertions(+)
>>
>> diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
>> index 5bf0d6c9c025..f2afcf0e986a 100644
>> --- a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
>> +++ b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
>> @@ -59,6 +59,14 @@ properties:
>>      minimum: 0
>>      maximum: 7
>>  
>> +  qcom,squelch-detector-bp:
>> +    description:
>> +      This adjusts the voltage level for the threshold used to detect valid
>> +      high-speed data.
>> +    minimum: -6000
> 
> 6000Volts, mV, can you please document the units?


Code is correct, the '-bp' is the unit here. Unless the suffix was
chosen incorrectly?


Best regards,
Krzysztof

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Re: [PATCH v3 1/3] dt-bindings: phy: qcom,snps-eusb2-repeater: Add squelch param update

[Vinod Koul]

On 23-12-25, 15:16, Krzysztof Kozlowski wrote:
> On 23/12/2025 15:11, Vinod Koul wrote:
> > On 19-12-25, 23:01, Krishna Kurapati wrote:
> >> Add squelch detect parameter update for synopsys eusb2 repeater. The
> >> values (indicated in basis-points) depict a percentage change with
> >> respect to the nominal value.
> >>
> >> Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
> >> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
> >> ---
> >>  .../devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml | 8 ++++++++
> >>  1 file changed, 8 insertions(+)
> >>
> >> diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> >> index 5bf0d6c9c025..f2afcf0e986a 100644
> >> --- a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> >> +++ b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> >> @@ -59,6 +59,14 @@ properties:
> >>      minimum: 0
> >>      maximum: 7
> >>  
> >> +  qcom,squelch-detector-bp:
> >> +    description:
> >> +      This adjusts the voltage level for the threshold used to detect valid
> >> +      high-speed data.
> >> +    minimum: -6000
> > 
> > 6000Volts, mV, can you please document the units?
> 
> 
> Code is correct, the '-bp' is the unit here. Unless the suffix was
> chosen incorrectly?

I was hoping it will be commented in the description here.
For my reference, what is bp and where is it documented ?

> 
> 
> Best regards,
> Krzysztof

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Re: [PATCH v3 1/3] dt-bindings: phy: qcom,snps-eusb2-repeater: Add squelch param update

[Dmitry Baryshkov]

On Tue, Dec 23, 2025 at 09:18:37PM +0530, Vinod Koul wrote:
> On 23-12-25, 15:16, Krzysztof Kozlowski wrote:
> > On 23/12/2025 15:11, Vinod Koul wrote:
> > > On 19-12-25, 23:01, Krishna Kurapati wrote:
> > >> Add squelch detect parameter update for synopsys eusb2 repeater. The
> > >> values (indicated in basis-points) depict a percentage change with
> > >> respect to the nominal value.
> > >>
> > >> Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
> > >> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
> > >> ---
> > >>  .../devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml | 8 ++++++++
> > >>  1 file changed, 8 insertions(+)
> > >>
> > >> diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> > >> index 5bf0d6c9c025..f2afcf0e986a 100644
> > >> --- a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> > >> +++ b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> > >> @@ -59,6 +59,14 @@ properties:
> > >>      minimum: 0
> > >>      maximum: 7
> > >>  
> > >> +  qcom,squelch-detector-bp:
> > >> +    description:
> > >> +      This adjusts the voltage level for the threshold used to detect valid
> > >> +      high-speed data.
> > >> +    minimum: -6000
> > > 
> > > 6000Volts, mV, can you please document the units?
> > 
> > 
> > Code is correct, the '-bp' is the unit here. Unless the suffix was
> > chosen incorrectly?
> 
> I was hoping it will be commented in the description here.
> For my reference, what is bp and where is it documented ?

Base points, 0.01%

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Re: [PATCH v3 1/3] dt-bindings: phy: qcom,snps-eusb2-repeater: Add squelch param update

[Vinod Koul]

On 23-12-25, 21:16, Dmitry Baryshkov wrote:
> On Tue, Dec 23, 2025 at 09:18:37PM +0530, Vinod Koul wrote:
> > On 23-12-25, 15:16, Krzysztof Kozlowski wrote:
> > > On 23/12/2025 15:11, Vinod Koul wrote:
> > > > On 19-12-25, 23:01, Krishna Kurapati wrote:
> > > >> Add squelch detect parameter update for synopsys eusb2 repeater. The
> > > >> values (indicated in basis-points) depict a percentage change with
> > > >> respect to the nominal value.
> > > >>
> > > >> Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
> > > >> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
> > > >> ---
> > > >>  .../devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml | 8 ++++++++
> > > >>  1 file changed, 8 insertions(+)
> > > >>
> > > >> diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> > > >> index 5bf0d6c9c025..f2afcf0e986a 100644
> > > >> --- a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> > > >> +++ b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> > > >> @@ -59,6 +59,14 @@ properties:
> > > >>      minimum: 0
> > > >>      maximum: 7
> > > >>  
> > > >> +  qcom,squelch-detector-bp:
> > > >> +    description:
> > > >> +      This adjusts the voltage level for the threshold used to detect valid
> > > >> +      high-speed data.
> > > >> +    minimum: -6000
> > > > 
> > > > 6000Volts, mV, can you please document the units?
> > > 
> > > 
> > > Code is correct, the '-bp' is the unit here. Unless the suffix was
> > > chosen incorrectly?
> > 
> > I was hoping it will be commented in the description here.
> > For my reference, what is bp and where is it documented ?
> 
> Base points, 0.01%

Thanks Dmitry, where is this documented for people who dont know

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Re: [PATCH v3 1/3] dt-bindings: phy: qcom,snps-eusb2-repeater: Add squelch param update

[Dmitry Baryshkov]

On Wed, 24 Dec 2025 at 07:28, Vinod Koul <vkoul@kernel.org> wrote:
>
> On 23-12-25, 21:16, Dmitry Baryshkov wrote:
> > On Tue, Dec 23, 2025 at 09:18:37PM +0530, Vinod Koul wrote:
> > > On 23-12-25, 15:16, Krzysztof Kozlowski wrote:
> > > > On 23/12/2025 15:11, Vinod Koul wrote:
> > > > > On 19-12-25, 23:01, Krishna Kurapati wrote:
> > > > >> Add squelch detect parameter update for synopsys eusb2 repeater. The
> > > > >> values (indicated in basis-points) depict a percentage change with
> > > > >> respect to the nominal value.
> > > > >>
> > > > >> Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
> > > > >> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
> > > > >> ---
> > > > >>  .../devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml | 8 ++++++++
> > > > >>  1 file changed, 8 insertions(+)
> > > > >>
> > > > >> diff --git a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> > > > >> index 5bf0d6c9c025..f2afcf0e986a 100644
> > > > >> --- a/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> > > > >> +++ b/Documentation/devicetree/bindings/phy/qcom,snps-eusb2-repeater.yaml
> > > > >> @@ -59,6 +59,14 @@ properties:
> > > > >>      minimum: 0
> > > > >>      maximum: 7
> > > > >>
> > > > >> +  qcom,squelch-detector-bp:
> > > > >> +    description:
> > > > >> +      This adjusts the voltage level for the threshold used to detect valid
> > > > >> +      high-speed data.
> > > > >> +    minimum: -6000
> > > > >
> > > > > 6000Volts, mV, can you please document the units?
> > > >
> > > >
> > > > Code is correct, the '-bp' is the unit here. Unless the suffix was
> > > > chosen incorrectly?
> > >
> > > I was hoping it will be commented in the description here.
> > > For my reference, what is bp and where is it documented ?
> >
> > Base points, 0.01%
>
> Thanks Dmitry, where is this documented for people who dont know

https://github.com/devicetree-org/dt-schema/blob/main/dtschema/schemas/property-units.yaml#L48

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[PATCH v3 2/3] phy: qualcomm: phy-qcom-eusb2-repeater: Add squelch detect param update

[Krishna Kurapati]

Add support for overriding Squelch Detect parameter.

Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
---
 .../phy/qualcomm/phy-qcom-eusb2-repeater.c    | 22 +++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
index 651a12b59bc8..a75b37d4e16d 100644
--- a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
+++ b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
@@ -37,6 +37,17 @@
 #define EUSB2_TUNE_EUSB_EQU		0x5A
 #define EUSB2_TUNE_EUSB_HS_COMP_CUR	0x5B
 
+static const int squelch_detector[] = {
+	[0] = -6000,
+	[1] = -5000,
+	[2] = -4000,
+	[3] = -3000,
+	[4] = -2000,
+	[5] = -1000,
+	[6] = 0,
+	[7] = 1000,
+};
+
 struct eusb2_repeater_init_tbl_reg {
 	unsigned int reg;
 	unsigned int value;
@@ -120,7 +131,9 @@ static int eusb2_repeater_init(struct phy *phy)
 	struct regmap *regmap = rptr->regmap;
 	u32 base = rptr->base;
 	u32 poll_val;
+	s32 dt_val;
 	int ret;
+	int i;
 	u8 val;
 
 	ret = regulator_bulk_enable(rptr->cfg->num_vregs, rptr->vregs);
@@ -147,6 +160,15 @@ static int eusb2_repeater_init(struct phy *phy)
 	if (!of_property_read_u8(np, "qcom,tune-res-fsdif", &val))
 		regmap_write(regmap, base + EUSB2_TUNE_RES_FSDIF, val);
 
+	if (!of_property_read_s32(np, "qcom,squelch-detector-bp", &dt_val)) {
+		for (i = 0; i < ARRAY_SIZE(squelch_detector); i++) {
+			if (squelch_detector[i] == dt_val) {
+				regmap_write(regmap, base + EUSB2_TUNE_SQUELCH_U, i);
+				break;
+			}
+		}
+	}
+
 	/* Wait for status OK */
 	ret = regmap_read_poll_timeout(regmap, base + EUSB2_RPTR_STATUS, poll_val,
 				       poll_val & RPTR_OK, 10, 5);
-- 
2.34.1


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Re: [PATCH v3 2/3] phy: qualcomm: phy-qcom-eusb2-repeater: Add squelch detect param update

[Abel Vesa]

On 25-12-19 23:01:07, Krishna Kurapati wrote:
> Add support for overriding Squelch Detect parameter.
> 
> Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>

Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>

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Re: [PATCH v3 2/3] phy: qualcomm: phy-qcom-eusb2-repeater: Add squelch detect param update

[Konrad Dybcio]

On 12/19/25 6:31 PM, Krishna Kurapati wrote:
> Add support for overriding Squelch Detect parameter.
> 
> Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
> ---

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

Konrad

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Re: [PATCH v3 2/3] phy: qualcomm: phy-qcom-eusb2-repeater: Add squelch detect param update

[Abel Vesa]

On 25-12-19 23:01:07, Krishna Kurapati wrote:
> Add support for overriding Squelch Detect parameter.
> 
> Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>

Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>

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[PATCH v3 3/3] arm64: dts: qcom: sm8750-mtp: Add eusb2 repeater tuning parameters

[Krishna Kurapati]

Add eusb2 repeater tuning parameters for MTP platform.

Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
---
 arch/arm64/boot/dts/qcom/sm8750-mtp.dts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/boot/dts/qcom/sm8750-mtp.dts b/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
index c8cb521b4c26..e28faee466aa 100644
--- a/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
+++ b/arch/arm64/boot/dts/qcom/sm8750-mtp.dts
@@ -1039,10 +1039,14 @@ wifi@0 {
 };
 
 &pmih0108_eusb2_repeater {
-	status = "okay";
+	qcom,tune-usb2-preem = /bits/ 8 <0x3>;
+	qcom,tune-usb2-amplitude = /bits/ 8 <0xa>;
+	qcom,squelch-detector-bp = <(-2000)>;
 
 	vdd18-supply = <&vreg_l15b_1p8>;
 	vdd3-supply = <&vreg_l5b_3p1>;
+
+	status = "okay";
 };
 
 &qupv3_1 {
-- 
2.34.1


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Re: [PATCH v3 3/3] arm64: dts: qcom: sm8750-mtp: Add eusb2 repeater tuning parameters

[Konrad Dybcio]

On 12/19/25 6:31 PM, Krishna Kurapati wrote:
> Add eusb2 repeater tuning parameters for MTP platform.
> 
> Signed-off-by: Krishna Kurapati <krishna.kurapati@oss.qualcomm.com>
> Reviewed-by: Abel Vesa <abel.vesa@oss.qualcomm.com>
> ---

I don't see this override in the random downstream tag I opened,
but I assume you're adding this for a reason

Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>

Konrad

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Re: [PATCH v3 0/3] Add eusb2 repeater squelch detect parameter override

[Vinod Koul]

On Fri, 19 Dec 2025 23:01:05 +0530, Krishna Kurapati wrote:
> Add support for eusb2 repeater squelch detect parameter override via DT.
> 
> Squelch detect parameter adjusts the voltage level for the threshold used
> to detect valid high-speed data.
> 
> Changes in v3:
> - Moved status property to end of repeater node.
> - Updated commit text as per comments received in bindings patch.
> - Retained Krzysztof and Abel RB tags (since its upating commit text adding
>   information in bindings code and moving status property in dt code)
> 
> [...]

Applied, thanks!

[1/3] dt-bindings: phy: qcom,snps-eusb2-repeater: Add squelch param update
      commit: a590c0f935349b9f3ae72d9fdec002689915519d
[2/3] phy: qualcomm: phy-qcom-eusb2-repeater: Add squelch detect param update
      commit: 5c87da0308f9395700fd3072fcc45b43234366fb
[3/3] arm64: dts: qcom: sm8750-mtp: Add eusb2 repeater tuning parameters
      (no commit info)

Best regards,
-- 
~Vinod



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Re: (subset) [PATCH v3 0/3] Add eusb2 repeater squelch detect parameter override

[Bjorn Andersson]

On Fri, 19 Dec 2025 23:01:05 +0530, Krishna Kurapati wrote:
> Add support for eusb2 repeater squelch detect parameter override via DT.
> 
> Squelch detect parameter adjusts the voltage level for the threshold used
> to detect valid high-speed data.
> 
> Changes in v3:
> - Moved status property to end of repeater node.
> - Updated commit text as per comments received in bindings patch.
> - Retained Krzysztof and Abel RB tags (since its upating commit text adding
>   information in bindings code and moving status property in dt code)
> 
> [...]

Applied, thanks!

[3/3] arm64: dts: qcom: sm8750-mtp: Add eusb2 repeater tuning parameters
      commit: 09d87fdd83894bf3df4ecb79296d03c7a1ac24c3

Best regards,
-- 
Bjorn Andersson <andersson@kernel.org>

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