[PATCH 09/13] mfd: omap-usb-host: Add device tree support and binding information
kishon
kishon at ti.com
Tue Feb 5 17:16:38 EST 2013
On Monday 04 February 2013 09:28 PM, Roger Quadros wrote:
> 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;
> + }
These child devices should be destroyed on driver remove..no?
Thanks
Kishon
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