linux-kernel - [PATCH v2 2/3] usb: dwc3: dwc3-generic-plat: add layerscape dwc3 support

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Message-Id: <20250923-ls_dma_coherence-v2-2-ce3176396bdb@nxp.com>
Date: Tue, 23 Sep 2025 16:22:49 -0400
From: Frank Li <Frank.Li@....com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Thinh Nguyen <Thinh.Nguyen@...opsys.com>, Shawn Guo <shawnguo@...nel.org>
Cc: linux-usb@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, 
 bjorn.andersson@....qualcomm.com, Frank Li <Frank.Li@....com>, 
 Ze Huang <huang.ze@...ux.dev>
Subject: [PATCH v2 2/3] usb: dwc3: dwc3-generic-plat: add layerscape dwc3
 support

Add layerscape dwc3 support by using flatten dwc3 core library. Layerscape
dwc3 need set software managed property snps,gsbuscfg0-reqinfo as 0x2222
when dma-coherence set.

Signed-off-by: Frank Li <Frank.Li@....com>
---
 drivers/usb/dwc3/dwc3-generic-plat.c | 30 +++++++++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc3/dwc3-generic-plat.c b/drivers/usb/dwc3/dwc3-generic-plat.c
index d96b20570002dc619ea813f4d6a8013636a0f346..d886b6e557b12edda71203e4f640a9a0a53b4f35 100644
--- a/drivers/usb/dwc3/dwc3-generic-plat.c
+++ b/drivers/usb/dwc3/dwc3-generic-plat.c
@@ -8,10 +8,15 @@
  */
 
 #include <linux/clk.h>
+#include <linux/of_address.h>
 #include <linux/platform_device.h>
 #include <linux/reset.h>
 #include "glue.h"
 
+struct dwc3_generic_drvdata {
+	u32	gsbuscfg0;
+};
+
 struct dwc3_generic {
 	struct device		*dev;
 	struct dwc3		dwc;
@@ -29,6 +34,7 @@ static void dwc3_generic_reset_control_assert(void *data)
 
 static int dwc3_generic_probe(struct platform_device *pdev)
 {
+	const struct dwc3_generic_drvdata *drvdata;
 	struct dwc3_probe_data probe_data = {};
 	struct device *dev = &pdev->dev;
 	struct dwc3_generic *dwc3g;
@@ -41,6 +47,8 @@ static int dwc3_generic_probe(struct platform_device *pdev)
 
 	dwc3g->dev = dev;
 
+	drvdata = of_device_get_match_data(dev);
+
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	if (!res) {
 		dev_err(&pdev->dev, "missing memory resource\n");
@@ -70,6 +78,17 @@ static int dwc3_generic_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return dev_err_probe(dev, ret, "failed to get clocks\n");
 
+	if (of_dma_is_coherent(pdev->dev.of_node)) {
+		struct property_entry props[2] = {};
+
+		props[0] = PROPERTY_ENTRY_U16("snps,gsbuscfg0-reqinfo", drvdata->gsbuscfg0);
+
+		ret = device_create_managed_software_node(dev, props, NULL);
+		if (ret)
+			return dev_err_probe(dev, ret,
+					     "fail create software managed property node\n");
+	}
+
 	dwc3g->num_clocks = ret;
 	dwc3g->dwc.dev = dev;
 	probe_data.dwc = &dwc3g->dwc;
@@ -145,8 +164,17 @@ static const struct dev_pm_ops dwc3_generic_dev_pm_ops = {
 		       dwc3_generic_runtime_idle)
 };
 
+static const struct dwc3_generic_drvdata spacemit_k1_dwc3 = {
+	.gsbuscfg0 = DWC3_GSBUSCFG0_REQINFO_UNSPECIFIED,
+};
+
+static const struct dwc3_generic_drvdata fsl_ls1028_dwc3 = {
+	.gsbuscfg0 = 0x2222,
+};
+
 static const struct of_device_id dwc3_generic_of_match[] = {
-	{ .compatible = "spacemit,k1-dwc3", },
+	{ .compatible = "spacemit,k1-dwc3", &spacemit_k1_dwc3},
+	{ .compatible = "fsl,ls1028a-dwc3", &fsl_ls1028_dwc3},
 	{ /* sentinel */ }
 };
 MODULE_DEVICE_TABLE(of, dwc3_generic_of_match);

-- 
2.34.1