linux-kernel - [PATCH v5 2/2] usb: dwc3: eic7700: Add EIC7700 USB driver

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Message-ID: <20251104065226.1513-1-caohang@eswincomputing.com>
Date: Tue,  4 Nov 2025 14:52:26 +0800
From: caohang@...incomputing.com
To: gregkh@...uxfoundation.org,
	robh@...nel.org,
	krzk+dt@...nel.org,
	conor+dt@...nel.org,
	Thinh.Nguyen@...opsys.com,
	p.zabel@...gutronix.de,
	linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	devicetree@...r.kernel.org
Cc: ningyu@...incomputing.com,
	linmin@...incomputing.com,
	pinkesh.vaghela@...fochips.com,
	Hang Cao <caohang@...incomputing.com>,
	Senchuan Zhang <zhangsenchuan@...incomputing.com>
Subject: [PATCH v5 2/2] usb: dwc3: eic7700: Add EIC7700 USB driver

From: Hang Cao <caohang@...incomputing.com>

Add the eic7700 usb driver, which is responsible for
identifying,configuring and connecting usb devices.

Signed-off-by: Senchuan Zhang <zhangsenchuan@...incomputing.com>
Signed-off-by: Hang Cao <caohang@...incomputing.com>
---
 drivers/usb/dwc3/dwc3-generic-plat.c | 43 ++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/usb/dwc3/dwc3-generic-plat.c b/drivers/usb/dwc3/dwc3-generic-plat.c
index 770fedc16bb8..89ad952a4a4c 100644
--- a/drivers/usb/dwc3/dwc3-generic-plat.c
+++ b/drivers/usb/dwc3/dwc3-generic-plat.c
@@ -10,8 +10,16 @@
 #include <linux/clk.h>
 #include <linux/platform_device.h>
 #include <linux/reset.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
 #include "glue.h"
 
+#define EIC7700_HSP_BUS_FILTER_EN	BIT(0)
+#define EIC7700_HSP_BUS_CLKEN_GM	BIT(9)
+#define EIC7700_HSP_BUS_CLKEN_GS	BIT(16)
+#define EIC7700_HSP_AXI_LP_XM_CSYSREQ	BIT(0)
+#define EIC7700_HSP_AXI_LP_XS_CSYSREQ	BIT(16)
+
 struct dwc3_generic {
 	struct device		*dev;
 	struct dwc3		dwc;
@@ -27,6 +35,34 @@ static void dwc3_generic_reset_control_assert(void *data)
 	reset_control_assert(data);
 }
 
+static int dwc3_eic7700_pre_init(struct device *dev)
+{
+	struct regmap *regmap;
+	u32 hsp_usb_axi_lp;
+	u32 hsp_usb_bus;
+	u32 args[2];
+	u32 val;
+
+	regmap = syscon_regmap_lookup_by_phandle_args(dev->of_node,
+						      "eswin,hsp-sp-csr",
+						      ARRAY_SIZE(args), args);
+	if (IS_ERR(regmap)) {
+		dev_err(dev, "No hsp-sp-csr phandle specified\n");
+		return PTR_ERR(regmap);
+	}
+
+	hsp_usb_bus       = args[0];
+	hsp_usb_axi_lp    = args[1];
+
+	regmap_read(regmap, hsp_usb_bus, &val);
+	regmap_write(regmap, hsp_usb_bus, val | EIC7700_HSP_BUS_FILTER_EN |
+		     EIC7700_HSP_BUS_CLKEN_GM | EIC7700_HSP_BUS_CLKEN_GS);
+
+	regmap_write(regmap, hsp_usb_axi_lp, EIC7700_HSP_AXI_LP_XM_CSYSREQ |
+		     EIC7700_HSP_AXI_LP_XS_CSYSREQ);
+	return 0;
+}
+
 static int dwc3_generic_probe(struct platform_device *pdev)
 {
 	const struct dwc3_properties *properties;
@@ -83,6 +119,12 @@ static int dwc3_generic_probe(struct platform_device *pdev)
 	else
 		probe_data.properties = DWC3_DEFAULT_PROPERTIES;
 
+	if (of_device_is_compatible(dev->of_node, "eswin,eic7700-dwc3")) {
+		ret = dwc3_eic7700_pre_init(dev);
+		if (ret)
+			return dev_err_probe(dev, ret, "eic7700 init fail\n");
+	}
+
 	ret = dwc3_core_probe(&probe_data);
 	if (ret)
 		return dev_err_probe(dev, ret, "failed to register DWC3 Core\n");
@@ -160,6 +202,7 @@ static const struct dwc3_properties fsl_ls1028_dwc3 = {
 static const struct of_device_id dwc3_generic_of_match[] = {
 	{ .compatible = "spacemit,k1-dwc3", },
 	{ .compatible = "fsl,ls1028a-dwc3", &fsl_ls1028_dwc3},
+	{ .compatible = "eswin,eic7700-dwc3",},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, dwc3_generic_of_match);
-- 
2.34.1