linux-kernel - [PATCH 2/4] phy: qualcomm: phy-qcom-eusb2-repeater: Support tune-res-fsdif prop

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Message-Id: <20250625-sm7635-eusb-repeater-v1-2-19d85541eb4c@fairphone.com>
Date: Wed, 25 Jun 2025 11:14:57 +0200
From: Luca Weiss <luca.weiss@...rphone.com>
To: 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>, Abel Vesa <abel.vesa@...aro.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org, 
 linux-arm-msm@...r.kernel.org, linux-phy@...ts.infradead.org, 
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Luca Weiss <luca.weiss@...rphone.com>
Subject: [PATCH 2/4] phy: qualcomm: phy-qcom-eusb2-repeater: Support
 tune-res-fsdif prop

Support reading the FS Differential TX Output Resistance Tuning from
devicetree and writing the register, as required on some boards.

Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
---
 drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
index d7493c2294ef23e37e484019a49ddf7b3d6a6a46..61594739e5b12706775622e1f76af6ad5d2d29bf 100644
--- a/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
+++ b/drivers/phy/qualcomm/phy-qcom-eusb2-repeater.c
@@ -136,6 +136,9 @@ static int eusb2_repeater_init(struct phy *phy)
 	if (!of_property_read_u8(np, "qcom,tune-usb2-preem", &val))
 		regmap_write(regmap, base + EUSB2_TUNE_IUSB2, val);
 
+	if (!of_property_read_u8(np, "qcom,tune-res-fsdif", &val))
+		regmap_write(regmap, base + EUSB2_TUNE_RES_FSDIF, val);
+
 	/* Wait for status OK */
 	ret = regmap_read_poll_timeout(regmap, base + EUSB2_RPTR_STATUS, poll_val,
 				       poll_val & RPTR_OK, 10, 5);

-- 
2.50.0