[PATCH 2/2] mfd: omap-usb-host: Add device tree support and binding information
From: Roger Quadros
Date: Tue Apr 09 2013 - 04:40:06 EST
Allows the OMAP HS USB host controller to be specified
via device tree.
Signed-off-by: Roger Quadros <rogerq@xxxxxx>
Reviewed-by: Mark Rutland <mark.rutland@xxxxxxx>
---
.../devicetree/bindings/mfd/omap-usb-host.txt | 80 ++++++++++
drivers/mfd/omap-usb-host.c | 161 +++++++++++++++++++-
2 files changed, 235 insertions(+), 6 deletions(-)
create mode 100644 Documentation/devicetree/bindings/mfd/omap-usb-host.txt
diff --git a/Documentation/devicetree/bindings/mfd/omap-usb-host.txt b/Documentation/devicetree/bindings/mfd/omap-usb-host.txt
new file mode 100644
index 0000000..b381fa6
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/omap-usb-host.txt
@@ -0,0 +1,80 @@
+OMAP HS USB Host
+
+Required properties:
+
+- compatible: should be "ti,usbhs-host"
+- reg: should contain one register range i.e. start and length
+- ti,hwmods: must contain "usb_host_hs"
+
+Optional properties:
+
+- num-ports: number of USB ports. Usually this is automatically detected
+ from the IP's revision register but can be overridden by specifying
+ this property. A maximum of 3 ports are supported at the moment.
+
+- portN-mode: String specifying the port mode for port N, where N can be
+ from 1 to 3. If the port mode is not specified, that port is treated
+ as unused. When specified, it must be one of the following.
+ "ehci-phy",
+ "ehci-tll",
+ "ehci-hsic",
+ "ohci-phy-6pin-datse0",
+ "ohci-phy-6pin-dpdm",
+ "ohci-phy-3pin-datse0",
+ "ohci-phy-4pin-dpdm",
+ "ohci-tll-6pin-datse0",
+ "ohci-tll-6pin-dpdm",
+ "ohci-tll-3pin-datse0",
+ "ohci-tll-4pin-dpdm",
+ "ohci-tll-2pin-datse0",
+ "ohci-tll-2pin-dpdm",
+
+- single-ulpi-bypass: Must be present if the controller contains a single
+ ULPI bypass control bit. e.g. OMAP3 silicon <= ES2.1
+
+Required properties if child node exists:
+
+- #address-cells: Must be 1
+- #size-cells: Must be 1
+- ranges: must be present
+
+Properties for children:
+
+The OMAP HS USB Host subsystem contains EHCI and OHCI controllers.
+See Documentation/devicetree/bindings/usb/omap-ehci.txt and
+omap3-ohci.txt
+
+Example for OMAP4:
+
+usbhshost: usbhshost@4a064000 {
+ compatible = "ti,usbhs-host";
+ reg = <0x4a064000 0x800>;
+ ti,hwmods = "usb_host_hs";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges;
+
+ usbhsohci: ohci@4a064800 {
+ compatible = "ti,ohci-omap3", "usb-ohci";
+ reg = <0x4a064800 0x400>;
+ interrupt-parent = <&gic>;
+ interrupts = <0 76 0x4>;
+ };
+
+ usbhsehci: ehci@4a064c00 {
+ compatible = "ti,ehci-omap", "usb-ehci";
+ reg = <0x4a064c00 0x400>;
+ interrupt-parent = <&gic>;
+ interrupts = <0 77 0x4>;
+ };
+};
+
+&usbhshost {
+ port1-mode = "ehci-phy";
+ port2-mode = "ehci-tll";
+ port3-mode = "ehci-phy";
+};
+
+&usbhsehci {
+ phys = <&hsusb1_phy 0 &hsusb3_phy>;
+};
diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
index 138ee98..d3b6e94 100644
--- a/drivers/mfd/omap-usb-host.c
+++ b/drivers/mfd/omap-usb-host.c
@@ -1,8 +1,9 @@
/**
* omap-usb-host.c - The USBHS core driver for OMAP EHCI & OHCI
*
- * Copyright (C) 2011 Texas Instruments Incorporated - http://www.ti.com
+ * Copyright (C) 2011-2013 Texas Instruments Incorporated - http://www.ti.com
* Author: Keshava Munegowda <keshava_mgowda@xxxxxx>
+ * Author: Roger Quadros <rogerq@xxxxxx>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 of
@@ -27,6 +28,8 @@
#include <linux/platform_device.h>
#include <linux/platform_data/usb-omap.h>
#include <linux/pm_runtime.h>
+#include <linux/of.h>
+#include <linux/of_platform.h>
#include "omap-usb.h"
@@ -137,6 +140,49 @@ static inline u8 usbhs_readb(void __iomem *base, u8 reg)
/*-------------------------------------------------------------------------*/
+/**
+ * Map 'enum usbhs_omap_port_mode' found in <linux/platform_data/usb-omap.h>
+ * to the device tree binding portN-mode found in
+ * 'Documentation/devicetree/bindings/mfd/omap-usb-host.txt'
+ */
+static const char * const port_modes[] = {
+ [OMAP_USBHS_PORT_MODE_UNUSED] = "",
+ [OMAP_EHCI_PORT_MODE_PHY] = "ehci-phy",
+ [OMAP_EHCI_PORT_MODE_TLL] = "ehci-tll",
+ [OMAP_EHCI_PORT_MODE_HSIC] = "ehci-hsic",
+ [OMAP_OHCI_PORT_MODE_PHY_6PIN_DATSE0] = "ohci-phy-6pin-datse0",
+ [OMAP_OHCI_PORT_MODE_PHY_6PIN_DPDM] = "ohci-phy-6pin-dpdm",
+ [OMAP_OHCI_PORT_MODE_PHY_3PIN_DATSE0] = "ohci-phy-3pin-datse0",
+ [OMAP_OHCI_PORT_MODE_PHY_4PIN_DPDM] = "ohci-phy-4pin-dpdm",
+ [OMAP_OHCI_PORT_MODE_TLL_6PIN_DATSE0] = "ohci-tll-6pin-datse0",
+ [OMAP_OHCI_PORT_MODE_TLL_6PIN_DPDM] = "ohci-tll-6pin-dpdm",
+ [OMAP_OHCI_PORT_MODE_TLL_3PIN_DATSE0] = "ohci-tll-3pin-datse0",
+ [OMAP_OHCI_PORT_MODE_TLL_4PIN_DPDM] = "ohci-tll-4pin-dpdm",
+ [OMAP_OHCI_PORT_MODE_TLL_2PIN_DATSE0] = "ohci-tll-2pin-datse0",
+ [OMAP_OHCI_PORT_MODE_TLL_2PIN_DPDM] = "ohci-tll-2pin-dpdm",
+};
+
+/**
+ * omap_usbhs_get_dt_port_mode - Get the 'enum usbhs_omap_port_mode'
+ * from the port mode string.
+ * @mode: The port mode string, usually obtained from device tree.
+ *
+ * The function returns the 'enum usbhs_omap_port_mode' that matches the
+ * provided port mode string as per the port_modes table.
+ * If no match is found it returns -ENODEV
+ */
+static const int omap_usbhs_get_dt_port_mode(const char *mode)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(port_modes); i++) {
+ if (!strcmp(mode, port_modes[i]))
+ return i;
+ }
+
+ return -ENODEV;
+}
+
static struct platform_device *omap_usbhs_alloc_child(const char *name,
struct resource *res, int num_resources, void *pdata,
size_t pdata_size, struct device *dev)
@@ -464,6 +510,58 @@ static void omap_usbhs_init(struct device *dev)
pm_runtime_put_sync(dev);
}
+static int usbhs_omap_get_dt_pdata(struct device *dev,
+ struct usbhs_omap_platform_data *pdata)
+{
+ int ret, i;
+ struct device_node *node = dev->of_node;
+
+ ret = of_property_read_u32(node, "num-ports", &pdata->nports);
+ if (ret)
+ pdata->nports = 0;
+
+ if (pdata->nports > OMAP3_HS_USB_PORTS) {
+ dev_warn(dev, "Too many num_ports <%d> in device tree. Max %d\n",
+ pdata->nports, OMAP3_HS_USB_PORTS);
+ return -ENODEV;
+ }
+
+ /* get port modes */
+ for (i = 0; i < OMAP3_HS_USB_PORTS; i++) {
+ char prop[11];
+ const char *mode;
+
+ pdata->port_mode[i] = OMAP_USBHS_PORT_MODE_UNUSED;
+
+ snprintf(prop, sizeof(prop), "port%d-mode", i + 1);
+ ret = of_property_read_string(node, prop, &mode);
+ if (ret < 0)
+ continue;
+
+ ret = omap_usbhs_get_dt_port_mode(mode);
+ if (ret < 0) {
+ dev_warn(dev, "Invalid port%d-mode \"%s\" in device tree\n",
+ i, mode);
+ return -ENODEV;
+ }
+
+ dev_dbg(dev, "port%d-mode: %s -> %d\n", i, mode, ret);
+ pdata->port_mode[i] = ret;
+ }
+
+ /* get flags */
+ pdata->single_ulpi_bypass = of_property_read_bool(node,
+ "single-ulpi-bypass");
+
+ return 0;
+}
+
+static struct of_device_id usbhs_child_match_table[] = {
+ { .compatible = "ti,omap-ehci", },
+ { .compatible = "ti,omap-ohci", },
+ { }
+};
+
/**
* usbhs_omap_probe - initialize TI-based HCDs
*
@@ -479,18 +577,37 @@ static int usbhs_omap_probe(struct platform_device *pdev)
int i;
bool need_logic_fck;
+ if (dev->of_node) {
+ /* For DT boot we populate platform data from OF node */
+ pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
+ if (!pdata)
+ return -ENOMEM;
+
+ ret = usbhs_omap_get_dt_pdata(dev, pdata);
+ if (ret)
+ return ret;
+
+ dev->platform_data = pdata;
+ }
+
if (!pdata) {
dev_err(dev, "Missing platform data\n");
return -ENODEV;
}
+ if (pdata->nports > OMAP3_HS_USB_PORTS) {
+ dev_info(dev, "Too many num_ports <%d> in platform_data. Max %d\n",
+ pdata->nports, OMAP3_HS_USB_PORTS);
+ return -ENODEV;
+ }
+
omap = devm_kzalloc(dev, sizeof(*omap), GFP_KERNEL);
if (!omap) {
dev_err(dev, "Memory allocation failed\n");
return -ENOMEM;
}
- res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "uhh");
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
omap->uhh_base = devm_request_and_ioremap(dev, res);
if (!omap->uhh_base) {
dev_err(dev, "Resource request/ioremap failed\n");
@@ -661,10 +778,23 @@ static int usbhs_omap_probe(struct platform_device *pdev)
}
omap_usbhs_init(dev);
- ret = omap_usbhs_alloc_children(pdev);
- if (ret) {
- dev_err(dev, "omap_usbhs_alloc_children failed\n");
- goto err_alloc;
+
+ if (dev->of_node) {
+ ret = of_platform_populate(dev->of_node,
+ usbhs_child_match_table, NULL, dev);
+
+ if (ret) {
+ dev_err(dev, "Failed to create DT children: %d\n", ret);
+ goto err_alloc;
+ }
+
+ } else {
+ ret = omap_usbhs_alloc_children(pdev);
+ if (ret) {
+ dev_err(dev, "omap_usbhs_alloc_children failed: %d\n",
+ ret);
+ goto err_alloc;
+ }
}
return 0;
@@ -703,6 +833,13 @@ err_mem:
return ret;
}
+static int usbhs_omap_remove_child(struct device *dev, void *data)
+{
+ dev_info(dev, "unregistering\n");
+ platform_device_unregister(to_platform_device(dev));
+ return 0;
+}
+
/**
* usbhs_omap_remove - shutdown processing for UHH & TLL HCDs
* @pdev: USB Host Controller being removed
@@ -734,6 +871,8 @@ static int usbhs_omap_remove(struct platform_device *pdev)
pm_runtime_disable(&pdev->dev);
+ /* remove children */
+ device_for_each_child(&pdev->dev, NULL, usbhs_omap_remove_child);
return 0;
}
@@ -742,16 +881,26 @@ static const struct dev_pm_ops usbhsomap_dev_pm_ops = {
.runtime_resume = usbhs_runtime_resume,
};
+static const struct of_device_id usbhs_omap_dt_ids[] = {
+ { .compatible = "ti,usbhs-host" },
+ { }
+};
+
+MODULE_DEVICE_TABLE(of, usbhs_omap_dt_ids);
+
+
static struct platform_driver usbhs_omap_driver = {
.driver = {
.name = (char *)usbhs_driver_name,
.owner = THIS_MODULE,
.pm = &usbhsomap_dev_pm_ops,
+ .of_match_table = of_match_ptr(usbhs_omap_dt_ids),
},
.remove = usbhs_omap_remove,
};
MODULE_AUTHOR("Keshava Munegowda <keshava_mgowda@xxxxxx>");
+MODULE_AUTHOR("Roger Quadros <rogerq@xxxxxx>");
MODULE_ALIAS("platform:" USBHS_DRIVER_NAME);
MODULE_LICENSE("GPL v2");
MODULE_DESCRIPTION("usb host common core driver for omap EHCI and OHCI");
--
1.7.4.1
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