[PATCH 09/13] mfd: omap-usb-host: Add device tree support and binding information
Roger Quadros
rogerq at ti.com
Tue Feb 5 02:58:56 EST 2013
Allows the OMAP HS USB host controller to be specified
via device tree.
CC: Samuel Ortiz <sameo at linux.intel.com>
Signed-off-by: Roger Quadros <rogerq at ti.com>
---
.../devicetree/bindings/mfd/omap-usb-host.txt | 68 ++++++++++++++++
drivers/mfd/omap-usb-host.c | 83 ++++++++++++++++++--
2 files changed, 145 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..2196893
--- /dev/null
+++ b/Documentation/devicetree/bindings/mfd/omap-usb-host.txt
@@ -0,0 +1,68 @@
+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:
+
+- nports: number of USB ports. Usually this is automatically detected
+ from the IP's revision register but can be overridden by specifying
+ this property.
+
+- portN_mode: Integer specifying the port mode for port N, where N can be
+ from 1 to nports. The port mode must be as per enum usbhs_omap_port_mode
+ in include/linux/platform_data/usb-omap.h
+ If the port mode is not specified, that port is treated as unused.
+
+- 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 at 0x4a064000 {
+ compatible = "ti,usbhs-host";
+ reg = <0x4a064000 0x800>;
+ ti,hwmods = "usb_host_hs";
+ #address-cells = <1>;
+ #size-cells = <1>;
+ ranges;
+
+ usbhsohci: ohci at 0x4a064800 {
+ compatible = "ti,omap3-ohci", "usb-ohci";
+ reg = <0x4a064800 0x400>;
+ interrupt-parent = <&gic>;
+ interrupts = <0 76 0x4>;
+ };
+
+ usbhsehci: ehci at 0x4a064c00 {
+ compatible = "ti,omap-ehci", "usb-ehci";
+ reg = <0x4a064c00 0x400>;
+ interrupt-parent = <&gic>;
+ interrupts = <0 77 0x4>;
+ };
+};
+
+&usbhshost {
+ port1_mode = <1>; /* OMAP_EHCI_PORT_MODE_PHY */
+ port2_mode = <2>; /* OMAP_EHCI_PORT_MODE_TLL */
+ port3_mode = <1>; /* OMAP_EHCI_PORT_MODE_PHY */
+};
+
+&usbhsehci {
+ phy = <&hsusb1_phy 0 &hsusb3_phy>;
+};
diff --git a/drivers/mfd/omap-usb-host.c b/drivers/mfd/omap-usb-host.c
index f8ed08e..0f67856 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 at ti.com>
+ * Author: Roger Quadros <rogerq at ti.com>
*
* 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"
@@ -464,6 +467,37 @@ static void omap_usbhs_init(struct device *dev)
pm_runtime_put_sync(dev);
}
+static int usbhs_omap_get_dt_pdata(struct device_node *node,
+ struct usbhs_omap_platform_data *pdata)
+{
+ int ret, i;
+
+ ret = of_property_read_u32(node, "nports", &pdata->nports);
+ if (ret)
+ pdata->nports = 0;
+
+ /* get port modes */
+ for (i = 0; i < OMAP3_HS_USB_PORTS; i++) {
+ char prop[11];
+
+ snprintf(prop, sizeof(prop), "port%d_mode", i + 1);
+ ret = of_property_read_u32(node, prop, &pdata->port_mode[i]);
+ if (ret)
+ pdata->port_mode[i] = OMAP_USBHS_PORT_MODE_UNUSED;
+ }
+
+ /* 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[] __initdata = {
+ { .compatible = "ti,omap-ehci", },
+ { .compatible = "ti,omap-ohci", },
+ { }
+};
+
/**
* usbhs_omap_probe - initialize TI-based HCDs
*
@@ -479,6 +513,21 @@ 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;
+
+ if (usbhs_omap_get_dt_pdata(dev->of_node, pdata)) {
+ dev_err(dev,
+ "Error getting platform data from DT node\n");
+ return -ENODEV;
+ }
+
+ dev->platform_data = pdata;
+ }
+
if (!pdata) {
dev_err(dev, "Missing platform data\n");
return -ENODEV;
@@ -490,7 +539,7 @@ static int usbhs_omap_probe(struct platform_device *pdev)
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 +710,23 @@ 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;
@@ -742,11 +804,20 @@ 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,
};
--
1.7.4.1
More information about the devicetree-discuss
mailing list