This very-lowlevel driver registers the NXP ISP1301 chip via the I2C subsystem.
The chip is the USB transceiver shared by ohci-nxp, lpc32xx_udc (gadget) and
isp1301_omap.
Following patches let the respective USB host and gadget drivers use this
driver, instead of duplicating ISP1301 handling.
Signed-off-by: Roland Stigge <stigge@xxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
---
Applies to v3.4-rc3
Changes since v3:
* Check if device is actually bound to isp1301_driver
* Error handling fix: Catch NULL return from bus_find_device()
Thanks to Arnd Bergmann for reviewing and suggestions!
Documentation/devicetree/bindings/usb/isp1301.txt | 25 ++++++
drivers/usb/Kconfig | 2
drivers/usb/Makefile | 1
drivers/usb/phy/Kconfig | 17 ++++
drivers/usb/phy/Makefile | 7 +
drivers/usb/phy/isp1301.c | 79 ++++++++++++++++++++
include/linux/usb/isp1301.h | 84 ++++++++++++++++++++++
7 files changed, 215 insertions(+)
--- /dev/null
+++ linux-2.6/Documentation/devicetree/bindings/usb/isp1301.txt
@@ -0,0 +1,25 @@
+* NXP ISP1301 USB transceiver
+
+Required properties:
+- compatible: must be "nxp,isp1301"
+- reg: I2C address of the ISP1301 device
+
+Optional properties of devices using ISP1301:
+- transceiver: phandle of isp1301 - this helps the ISP1301 driver to find the
+ ISP1301 instance associated with the respective USB driver
+
+Example:
+
+ isp1301: usb-transceiver@2c {
+ compatible = "nxp,isp1301";
+ reg = <0x2c>;
+ };
+
+ usbd@31020000 {
+ compatible = "nxp,lpc32xx-udc";
+ reg = <0x31020000 0x300>;
+ interrupt-parent = <&mic>;
+ interrupts = <0x3d 0>, <0x3e 0>, <0x3c 0>, <0x3a 0>;
+ transceiver = <&isp1301>;
+ status = "okay";
+ };
--- linux-2.6.orig/drivers/usb/Kconfig
+++ linux-2.6/drivers/usb/Kconfig
@@ -177,6 +177,8 @@ source "drivers/usb/serial/Kconfig"
source "drivers/usb/misc/Kconfig"
+source "drivers/usb/phy/Kconfig"
+
source "drivers/usb/atm/Kconfig"
source "drivers/usb/gadget/Kconfig"
--- linux-2.6.orig/drivers/usb/Makefile
+++ linux-2.6/drivers/usb/Makefile
@@ -46,6 +46,7 @@ obj-$(CONFIG_USB_MICROTEK) += image/
obj-$(CONFIG_USB_SERIAL) += serial/
obj-$(CONFIG_USB) += misc/
+obj-$(CONFIG_USB) += phy/
obj-$(CONFIG_EARLY_PRINTK_DBGP) += early/
obj-$(CONFIG_USB_ATM) += atm/
--- /dev/null
+++ linux-2.6/drivers/usb/phy/Kconfig
@@ -0,0 +1,17 @@
+#
+# Physical Layer USB driver configuration
+#
+comment "USB Physical Layer drivers"
+ depends on USB
+
+config USB_ISP1301
+ tristate "NXP ISP1301 USB transceiver support"
+ depends on USB
+ depends on I2C
+ help
+ Say Y here to add support for the NXP ISP1301 USB transceiver driver.
+ This chip is typically used as USB transceiver for USB host, gadget
+ and OTG drivers (to be selected separately).
+
+ To compile this driver as a module, choose M here: the
+ module will be called isp1301.
--- /dev/null
+++ linux-2.6/drivers/usb/phy/Makefile
@@ -0,0 +1,7 @@
+#
+# Makefile for physical layer USB drivers
+#
+
+ccflags-$(CONFIG_USB_DEBUG) := -DDEBUG
+
+obj-$(CONFIG_USB_ISP1301) += isp1301.o
--- /dev/null
+++ linux-2.6/drivers/usb/phy/isp1301.c
@@ -0,0 +1,79 @@
+/*
+ * NXP ISP1301 USB transceiver driver
+ *
+ * Copyright (C) 2012 Roland Stigge
+ *
+ * Author: Roland Stigge <stigge@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/module.h>
+#include <linux/i2c.h>
+
+#define DRV_NAME "isp1301"
+#define DRV_VERSION "0.1.0"
+
+#define ISP1301_I2C_ADDR 0x2C
+
+static const unsigned short normal_i2c[] = {
+ ISP1301_I2C_ADDR, ISP1301_I2C_ADDR + 1, I2C_CLIENT_END
+};
+
+static const struct i2c_device_id isp1301_id[] = {
+ { "isp1301", 0 },
+ { }
+};
+
+static struct i2c_client *isp1301_i2c_client;
+
+static int isp1301_probe(struct i2c_client *client,
+ const struct i2c_device_id *i2c_id)
+{
+ isp1301_i2c_client = client;
+ return 0;
+}
+
+static int isp1301_remove(struct i2c_client *client)
+{
+ return 0;
+}
+
+static struct i2c_driver isp1301_driver = {
+ .driver = {
+ .name = DRV_NAME,
+ },
+ .probe = isp1301_probe,
+ .remove = isp1301_remove,
+ .id_table = isp1301_id,
+};
+
+module_i2c_driver(isp1301_driver);
+
+static int match(struct device *dev, void *data)
+{
+ struct device_node *node = (struct device_node *)data;
+ return (dev->of_node == node) &&
+ (dev->driver == &isp1301_driver.driver);
+}
+
+struct i2c_client *isp1301_get_client(struct device_node *node)
+{
+ if (node) { /* reference of ISP1301 I2C node via DT */
+ struct device *dev = bus_find_device(&i2c_bus_type, NULL,
+ node, match);
+ if (!dev)
+ return NULL;
+ return to_i2c_client(dev);
+ } else { /* non-DT: only one ISP1301 chip supported */
+ return isp1301_i2c_client;
+ }
+}
+EXPORT_SYMBOL(isp1301_get_client);
+
+MODULE_AUTHOR("Roland Stigge <stigge@xxxxxxxxx>");
+MODULE_DESCRIPTION("NXP ISP1301 USB transceiver driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(DRV_VERSION);
--- /dev/null
+++ linux-2.6/include/linux/usb/isp1301.h
@@ -0,0 +1,84 @@
+/*
+ * NXP ISP1301 USB transceiver driver
+ *
+ * Copyright (C) 2012 Roland Stigge <stigge@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#ifndef __LINUX_USB_ISP1301_H
+#define __LINUX_USB_ISP1301_H
+
+#include <linux/of.h>
+
+/* I2C Register definitions: */
+
+#define ISP1301_I2C_MODE_CONTROL_1 0x04 /* u8 read, set, +1 clear */
+
+#define MC1_SPEED_REG (1 << 0)
+#define MC1_SUSPEND_REG (1 << 1)
+#define MC1_DAT_SE0 (1 << 2)
+#define MC1_TRANSPARENT (1 << 3)
+#define MC1_BDIS_ACON_EN (1 << 4)
+#define MC1_OE_INT_EN (1 << 5)
+#define MC1_UART_EN (1 << 6)
+#define MC1_MASK 0x7f
+
+#define ISP1301_I2C_MODE_CONTROL_2 0x12 /* u8 read, set, +1 clear */
+
+#define MC2_GLOBAL_PWR_DN (1 << 0)
+#define MC2_SPD_SUSP_CTRL (1 << 1)
+#define MC2_BI_DI (1 << 2)
+#define MC2_TRANSP_BDIR0 (1 << 3)
+#define MC2_TRANSP_BDIR1 (1 << 4)
+#define MC2_AUDIO_EN (1 << 5)
+#define MC2_PSW_EN (1 << 6)
+#define MC2_EN2V7 (1 << 7)
+
+#define ISP1301_I2C_OTG_CONTROL_1 0x06 /* u8 read, set, +1 clear */
+
+#define OTG1_DP_PULLUP (1 << 0)
+#define OTG1_DM_PULLUP (1 << 1)
+#define OTG1_DP_PULLDOWN (1 << 2)
+#define OTG1_DM_PULLDOWN (1 << 3)
+#define OTG1_ID_PULLDOWN (1 << 4)
+#define OTG1_VBUS_DRV (1 << 5)
+#define OTG1_VBUS_DISCHRG (1 << 6)
+#define OTG1_VBUS_CHRG (1 << 7)
+
+#define ISP1301_I2C_OTG_CONTROL_2 0x10 /* u8 readonly */
+
+#define OTG_B_SESS_END (1 << 6)
+#define OTG_B_SESS_VLD (1 << 7)
+
+#define ISP1301_I2C_INTERRUPT_SOURCE 0x8
+#define ISP1301_I2C_INTERRUPT_LATCH 0xA
+#define ISP1301_I2C_INTERRUPT_FALLING 0xC
+#define ISP1301_I2C_INTERRUPT_RISING 0xE
+
+#define INT_VBUS_VLD (1 << 0)
+#define INT_SESS_VLD (1 << 1)
+#define INT_DP_HI (1 << 2)
+#define INT_ID_GND (1 << 3)
+#define INT_DM_HI (1 << 4)
+#define INT_ID_FLOAT (1 << 5)
+#define INT_BDIS_ACON (1 << 6)
+#define INT_CR_INT (1 << 7)
+
+#define ISP1301_I2C_REG_CLEAR_ADDR 1 /* Register Address Modifier */
+
+struct i2c_client *isp1301_get_client(struct device_node *node);
+
+#endif /* __LINUX_USB_ISP1301_H */
--
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