[RFC PATCH 2/2] usb: Example for how to use device node at usb device driver
From: Peter Chen <hidden>
Date: 2016-01-08 05:44:24
Also in:
linux-arm-kernel
Subsystem:
the rest, usb subsystem · Maintainers:
Linus Torvalds, Greg Kroah-Hartman
Possibly related (same subject, not in this thread)
- 2016-01-09 · Re: [RFC PATCH 2/2] usb: Example for how to use device node at usb device driver · Peter Chen <hidden>
- 2016-01-08 · Re: [RFC PATCH 2/2] usb: Example for how to use device node at usb device driver · Arnd Bergmann <hidden>
In this example, we take HUB driver as an example to show how to get properties in USB device driver if this device has device node. Signed-off-by: Peter Chen <redacted> --- arch/arm/boot/dts/imx6sx-sdb.dtsi | 9 +++++++++ drivers/usb/core/hub.c | 8 ++++++++ 2 files changed, 17 insertions(+)
diff --git a/arch/arm/boot/dts/imx6sx-sdb.dtsi b/arch/arm/boot/dts/imx6sx-sdb.dtsi
index 94ac400..fe0fd95 100644
--- a/arch/arm/boot/dts/imx6sx-sdb.dtsi
+++ b/arch/arm/boot/dts/imx6sx-sdb.dtsi@@ -275,6 +275,15 @@ vbus-supply = <®_usb_otg2_vbus>; dr_mode = "host"; status = "okay"; + + #address-cells = <1>; + #size-cells = <0>; + hub: genesys@01 { + compatible = "05e3,0608"; + reg = <0x01>; + delay-duration-us = <50>; + }; + }; &usdhc2 {
diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 4c77001..1babfd4 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c@@ -27,6 +27,7 @@ #include <linux/random.h> #include <linux/pm_qos.h> #include <linux/of_platform.h> +#include <linux/of.h> #include <asm/uaccess.h> #include <asm/byteorder.h>
@@ -1748,6 +1749,7 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id) struct usb_device *hdev; struct usb_hub *hub; int ret; + u32 duration_us = 0; desc = intf->cur_altsetting; hdev = interface_to_usbdev(intf);
@@ -1873,6 +1875,12 @@ descriptor_error: return ret; } + of_property_read_u32(hdev->dev.of_node, "delay-duration-us", &duration_us); + if (duration_us > 0) { + usleep_range(duration_us, duration_us + 10); + dev_info(&hdev->dev, "The delay is %d us\n", duration_us); + } + if (hub_configure(hub, endpoint) >= 0) return 0;
--
1.9.1
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