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

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Message-ID: <fe15827d-c15c-4b4e-973e-3cc379714467@oss.qualcomm.com>
Date: Wed, 3 Dec 2025 12:15:00 +0100
From: Konrad Dybcio <konrad.dybcio@....qualcomm.com>
To: Krishna Kurapati <krishna.kurapati@....qualcomm.com>,
        Vinod Koul <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski <krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Luca Weiss
 <luca.weiss@...rphone.com>,
        Abel Vesa <abel.vesa@...aro.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        Johan Hovold <johan+linaro@...nel.org>,
        Pengyu Luo <mitltlatltl@...il.com>
Cc: linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] phy: qualcomm: phy-qcom-eusb2-repeater: Add squelch
 detect param update

On 12/3/25 9:36 AM, Krishna Kurapati wrote:
> Add support for overriding Squelch Detect parameter.
> 
> Signed-off-by: Krishna Kurapati <krishna.kurapati@....qualcomm.com>
> ---

[...]

>  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 +160,14 @@ 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 < 8; i++) {
> +			if (squelch_detector[i] == dt_val)
> +				val = i;
> +		}
> +		regmap_write(regmap, base + EUSB2_TUNE_SQUELCH_U, val);


How about:

if (!of_property..) {
	for (i = 0; i < ARRAY_SIZE(squelch_detector); i++) {
		if (squelch_detector[i] == dt_val) {
			regmap_write()
			break;
		}
	}
}

We could also validate the value (if none found but property present, error
out), but the dt checker already lists all the available values so that may
not be necessary

Konrad