linux-kernel - [RFC v2 5/7] phy: qcom: phy-qcom-snps-eusb2: Add support for eUSB2 repeater

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Message-Id: <20230126135909.1624890-6-abel.vesa@linaro.org>
Date:   Thu, 26 Jan 2023 15:59:07 +0200
From:   Abel Vesa <abel.vesa@...aro.org>
To:     Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Lee Jones <lee@...nel.org>, Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        Kishon Vijay Abraham I <kishon@...nel.org>
Cc:     linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-phy@...ts.infradead.org,
        Neil Armstrong <neil.armstrong@...aro.org>
Subject: [RFC v2 5/7] phy: qcom: phy-qcom-snps-eusb2: Add support for eUSB2 repeater

From: Neil Armstrong <neil.armstrong@...aro.org>

For USB 2.0 compliance, eUSB2 needs a repeater. The PHY needs to
initialize and reset it. So add repeater support

Co-developed-by: Abel Vesa <abel.vesa@...aro.org>
Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
---
 drivers/phy/qualcomm/phy-qcom-snps-eusb2.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/phy/qualcomm/phy-qcom-snps-eusb2.c b/drivers/phy/qualcomm/phy-qcom-snps-eusb2.c
index 23ec162cc3bd..dd53880d5b0e 100644
--- a/drivers/phy/qualcomm/phy-qcom-snps-eusb2.c
+++ b/drivers/phy/qualcomm/phy-qcom-snps-eusb2.c
@@ -128,6 +128,8 @@ struct qcom_snps_eusb2_hsphy {
 	struct regulator_bulk_data vregs[EUSB2_NUM_VREGS];
 
 	enum phy_mode mode;
+
+	struct phy *repeater;
 };
 
 static int qcom_snps_eusb2_hsphy_set_mode(struct phy *p, enum phy_mode mode, int submode)
@@ -136,7 +138,7 @@ static int qcom_snps_eusb2_hsphy_set_mode(struct phy *p, enum phy_mode mode, int
 
 	phy->mode = mode;
 
-	return 0;
+	return phy_set_mode_ext(phy->repeater, mode, submode);
 }
 
 static void qcom_snps_eusb2_hsphy_write_mask(void __iomem *base, u32 offset,
@@ -235,6 +237,11 @@ static int qcom_snps_eusb2_hsphy_init(struct phy *p)
 	if (ret)
 		return ret;
 
+	ret = phy_init(phy->repeater);
+	if (ret)
+		dev_err(&p->dev, "repeater init failed. %d\n", ret);
+		goto disable_vreg;
+
 	ret = clk_prepare_enable(phy->ref_clk);
 	if (ret) {
 		dev_err(&p->dev, "failed to enable ref clock, %d\n", ret);
@@ -342,6 +349,8 @@ static int qcom_snps_eusb2_hsphy_exit(struct phy *p)
 
 	regulator_bulk_disable(ARRAY_SIZE(phy->vregs), phy->vregs);
 
+	phy_exit(phy->repeater);
+
 	return 0;
 }
 
@@ -386,6 +395,12 @@ static int qcom_snps_eusb2_hsphy_probe(struct platform_device *pdev)
 	if (ret)
 		return dev_err_probe(dev, ret,
 				     "failed to get regulator supplies\n");
+
+	phy->repeater = devm_phy_get(dev, "eusb2-repeater");
+	if (IS_ERR(phy->repeater))
+		return dev_err_probe(dev, PTR_ERR(phy->repeater),
+				     "failed to get repeater\n");
+
 	generic_phy = devm_phy_create(dev, NULL, &qcom_snps_eusb2_hsphy_ops);
 	if (IS_ERR(generic_phy)) {
 		dev_err(dev, "failed to create phy %d\n", ret);
-- 
2.34.1