[PATCH 0/2] usb: misc: add support for microchip,usb2244 USB-SD controller

@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: "http://devicetree.org/schemas/usb/microchip,usb2244.yaml#"
+$schema: "http://devicetree.org/meta-schemas/core.yaml#"
+
+title: Bindings for the Microchip USB2244 Ultra Fast USB-SD Controller
+
+description:
+  Microchip’s USB224x is a USB 2.0 compliant, Hi-Speed bulk only mass
+  storage class peripheral controller intended for reading and writing
+  to popular flash media from the xDPicture Card™, Memory Stick® (MS),
+  Secure Digital (SD), and MultiMediaCard™ (MMC) families.
+
+  USB224x is a flash media card reader solution fully compliant with the
+  USB 2.0 specification
+
+maintainers:
+  - Piyush Mehta <piyush.mehta@xilinx.com>
+
+properties:
+  compatible:
+    const: microchip,usb2244
+
+  reset-gpios:
+    maxItems: 1
+    description:
+      The phandle and specifier for the GPIO that controls the RESET line of
+      flash media controller.
+
+required:
+  - compatible
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    usb {
+       compatible = "microchip,usb2244";
+       reset-gpios = <&gpio 2 GPIO_ACTIVE_HIGH>;
+    };

@@ -233,6 +233,14 @@ config USB_EZUSB_FX2
 	  Say Y here if you need EZUSB device support.
 	  (Cypress FX/FX2/FX2LP microcontrollers)
 
+config USB_USB2244
+	tristate "Microchip USB2244 Ultra Fast USB 2.0 SD driver"
+	depends on GPIOLIB
+	help
+	  This option enables support for Microchip USB2244 Ultra Fast USB 2.0
+	  SD controller. This driver reset the gpio pin makes controller out of
+	  reset.
+
 config USB_HUB_USB251XB
 	tristate "USB251XB Hub Controller Configuration Driver"
 	depends on I2C

@@ -24,6 +24,7 @@ obj-$(CONFIG_USB_TRANCEVIBRATOR)	+= trancevibrator.o
 obj-$(CONFIG_USB_USS720)		+= uss720.o
 obj-$(CONFIG_USB_SEVSEG)		+= usbsevseg.o
 obj-$(CONFIG_USB_YUREX)			+= yurex.o
+obj-$(CONFIG_USB_USB2244)		+= usb2244.o
 obj-$(CONFIG_USB_HUB_USB251XB)		+= usb251xb.o
 obj-$(CONFIG_USB_HSIC_USB3503)		+= usb3503.o
 obj-$(CONFIG_USB_HSIC_USB4604)		+= usb4604.o

@@ -0,0 +1,69 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Driver for the Microchip USB2244 Ultra Fast USB 2.0 Multi-Format,
+ * SD/MMC, and MS Flash Media Controllers
+ *
+ * Copyright (c) 2021 Xilinx, Inc.
+ */
+
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of_platform.h>
+#include <linux/gpio/consumer.h>
+#include <linux/platform_device.h>
+
+struct usb2244 {
+	struct gpio_desc *reset_gpio;
+};
+
+static int usb2244_init_hw(struct device *dev, struct usb2244 *data)
+{
+	data = devm_kzalloc(dev, sizeof(struct usb2244), GFP_KERNEL);
+	if (!data)
+		return -ENOMEM;
+
+	data->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
+	if (IS_ERR(data->reset_gpio)) {
+		dev_err_probe(dev, PTR_ERR(data->reset_gpio),
+			      "Failed to request reset GPIO %ld, errcode",
+			      PTR_ERR(data->reset_gpio));
+		return PTR_ERR(data->reset_gpio);
+	}
+
+	/* Toggle RESET_N to reset the hub. */
+	gpiod_set_value_cansleep(data->reset_gpio, 0);
+	usleep_range(5, 10);
+	gpiod_set_value_cansleep(data->reset_gpio, 1);
+	msleep(5);
+
+	return 0;
+}
+
+static int usb2244_probe(struct platform_device *pdev)
+{
+	struct usb2244 *data = NULL;
+
+	/* Trigger gpio reset to the hub. */
+	return usb2244_init_hw(&pdev->dev, data);
+}
+
+static const struct of_device_id usb2244_of_match[] = {
+	{ .compatible = "microchip,usb2244", },
+	{ }
+};
+
+static struct platform_driver usb2244_driver = {
+	.driver = {
+		.name = "microchip,usb2244",
+		.of_match_table	= usb2244_of_match,
+	},
+	.probe = usb2244_probe,
+};
+
+module_platform_driver(usb2244_driver);
+
+MODULE_AUTHOR("Piyush Mehta <piyush.mehta@xilinx.com>");
+MODULE_DESCRIPTION("USB2244 Ultra Fast SD-Controller");
+MODULE_LICENSE("GPL v2");