linux-kernel - [PATCH v5] usb: dwc3: core: add support for realtek SoCs custom's global register start address

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Date:   Thu, 4 May 2023 11:44:23 +0800
From:   Stanley Chang <stanley_chang@...ltek.com>
To:     Thinh Nguyen <Thinh.Nguyen@...opsys.com>
CC:     Stanley Chang <stanley_chang@...ltek.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH v5] usb: dwc3: core: add support for realtek SoCs custom's global register start address

The Realtek RTD1xxx SoCs were designed, the global register address
offset at 0x8100. The default address offset is constant at
DWC3_GLOBALS_REGS_START (0xc100). Therefore, add a check if the
compatible name of the parent is "realtek,rtd1xxx-dwc3", then global
register start address will remap to 0x8100.

Signed-off-by: Stanley Chang <stanley_chang@...ltek.com>
---
 v4 to v5 change:
Use the compatible name of the parent to match this special offset.

 v3 to v4 change:
Use the compatible name to specify the global register address offset.
If the compatible name is "snps,dwc3-rtk-soc", then the offset use 0x8100.
Otherwise, the offset is default value 0xc100.

 v2 to v3 change:
1.  Fix the dtschema validation error.

 v1 to v2 change:
1. Change the name of the property "snps,global-regs-starting-offset".
2. Adjust the format of comment.
3. Add initial value of the global_regs_starting_offset
4. Remove the log of dev_info.
---
 drivers/usb/dwc3/core.c | 11 +++++++++++
 drivers/usb/dwc3/core.h |  2 ++
 2 files changed, 13 insertions(+)

diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 0beaab932e7d..0adafb5439ed 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -1800,6 +1800,17 @@ static int dwc3_probe(struct platform_device *pdev)
 	dwc_res = *res;
 	dwc_res.start += DWC3_GLOBALS_REGS_START;
 
+	if (dev->of_node) {
+		struct device_node *parent = of_get_parent(dev->of_node);
+
+		if (of_device_is_compatible(parent, "realtek,rtd1xxx-dwc3")) {
+			dwc_res.start -= DWC3_GLOBALS_REGS_START;
+			dwc_res.start += DWC3_RTK_RTD1XXX_GLOBALS_REGS_START;
+		}
+
+		of_node_put(parent);
+	}
+
 	regs = devm_ioremap_resource(dev, &dwc_res);
 	if (IS_ERR(regs))
 		return PTR_ERR(regs);
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index d56457c02996..c004e3a548ca 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -84,6 +84,8 @@
 #define DWC3_OTG_REGS_START		0xcc00
 #define DWC3_OTG_REGS_END		0xccff
 
+#define DWC3_RTK_RTD1XXX_GLOBALS_REGS_START	0x8100
+
 /* Global Registers */
 #define DWC3_GSBUSCFG0		0xc100
 #define DWC3_GSBUSCFG1		0xc104
-- 
2.34.1