[U-Boot] [PATCH v1 3/3] cmd: usb gadget: Add a command to bind a USB gadget driver to a UDC port

[Lukasz Majewski <lukma@denx.de>]

Hi Jean-Jacques,

> Most of the time the UDC is bound to a driver when a dedicated
> command is executed, like 'dfu'. But the ethernet gadget driver must
> be bound by calling usb_ether_init() in the code otherwise the USB
> ethernet adapter is not visible to the ethernet core.
> 
> In DM context, the platform code should not be used to bind UDC to a
> particular driver, so adding a new command to bind a USB device port
> to a driver.
> 
> usage example:
> usbdev bind 0 usb_ether
> usbdev unbind 0

I would prefer a comment from Simon (so adding him to CC) - as it looks
to me that we shall try to use DM to avoid adding separate commands for
binding.

> 
> Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
> 
> ---
> 
>  cmd/usb.c                    | 71
> +++++++++++++++++++++++++++++++++++++++++++-
> drivers/core/device-remove.c | 11 +------
> include/dm/device-internal.h | 15 ++++++++++ 3 files changed, 86
> insertions(+), 11 deletions(-)
> 
> diff --git a/cmd/usb.c b/cmd/usb.c
> index 0ccb1b5..03245cb 100644
> --- a/cmd/usb.c
> +++ b/cmd/usb.c
> @@ -14,6 +14,8 @@
>  #include <command.h>
>  #include <console.h>
>  #include <dm.h>
> +#include <dm/lists.h>
> +#include <dm/device-internal.h>
>  #include <dm/uclass-internal.h>
>  #include <memalign.h>
>  #include <asm/byteorder.h>
> @@ -753,7 +755,6 @@ U_BOOT_CMD(
>  #endif /* CONFIG_USB_STORAGE */
>  );
>  
> -
>  #ifdef CONFIG_USB_STORAGE
>  U_BOOT_CMD(
>  	usbboot,	3,	1,	do_usbboot,
> @@ -761,3 +762,71 @@ U_BOOT_CMD(
>  	"loadAddr dev:part"
>  );
>  #endif /* CONFIG_USB_STORAGE */
> +
> +#ifdef CONFIG_DM_USB_DEV
> +int do_usbdev(cmd_tbl_t *cmdtp, int flag, int argc, char * const
> argv[]) +{
> +	struct udevice *dev;
> +	struct udevice *usb_dev;
> +	int port;
> +	int ret;
> +	bool bind;
> +	static const char * const supported_drivers[] = {
> +#ifdef CONFIG_USB_ETHER
> +		"usb_ether",
> +#endif
> +	};
> +
> +	if (argc < 2)
> +		return CMD_RET_USAGE;
> +
> +	if ((strncmp(argv[1], "bind", 4) == 0) && (argc == 4)) {
> +		port = simple_strtoul(argv[2], NULL, 10);
> +		printf("Binding USB port %d to %s\n", port, argv[3]);
> +		bind = true;
> +	} else if ((strncmp(argv[1], "unbind", 6) == 0) && (argc ==
> 3)) {
> +		port = simple_strtoul(argv[2], NULL, 10);
> +		printf("Unbinding USB port %d\n", port);
> +		bind = false;
> +	} else if ((strncmp(argv[1], "list", 4) == 0) && (argc ==
> 2)) {
> +		int i;
> +
> +		for (i = 0; i < ARRAY_SIZE(supported_drivers); i++)
> +			printf("%s\n", supported_drivers[i]);
> +
> +		return CMD_RET_SUCCESS;
> +	} else {
> +		return CMD_RET_USAGE;
> +	}
> +
> +	ret = uclass_find_device(UCLASS_USB_DEV_GENERIC, port,
> &usb_dev);
> +	if (!usb_dev || ret) {
> +		printf("Cannot find UDC %d\n", port);
> +		return CMD_RET_FAILURE;
> +	}
> +
> +	if (bind) {
> +		ret = device_bind_driver(usb_dev, argv[3], "gadget",
> &dev);
> +		if (!dev || ret) {
> +			printf("Unable to bind. err:%d\n", ret);
> +			return CMD_RET_FAILURE;
> +		}
> +	} else {
> +		ret = device_chld_unbind(usb_dev);
> +		if (ret) {
> +			printf("Unable to bind. err:%d\n", ret);
> +			return CMD_RET_FAILURE;
> +		}
> +	}
> +
> +	return CMD_RET_SUCCESS;
> +}
> +
> +U_BOOT_CMD(
> +	usbdev, 4, 0, do_usbdev,
> +	"USB gadget driver",
> +	"bind dev# driver- bind the USB device port to a driver\n"
> +	"unbind dev# - unbind the USB device port to a driver\n"
> +	"list - display the list of available gadget drivers"
> +);
> +#endif /*  CONFIG_DM_USB_DEV */
> diff --git a/drivers/core/device-remove.c
> b/drivers/core/device-remove.c index 1cf2278..b0b5ea3 100644
> --- a/drivers/core/device-remove.c
> +++ b/drivers/core/device-remove.c
> @@ -17,16 +17,7 @@
>  #include <dm/uclass-internal.h>
>  #include <dm/util.h>
>  
> -/**
> - * device_chld_unbind() - Unbind all device's children from the
> device
> - *
> - * On error, the function continues to unbind all children, and
> reports the
> - * first error.
> - *
> - * @dev:	The device that is to be stripped of its children
> - * @return 0 on success, -ve on error
> - */
> -static int device_chld_unbind(struct udevice *dev)
> +int device_chld_unbind(struct udevice *dev)
>  {
>  	struct udevice *pos, *n;
>  	int ret, saved_ret = 0;
> diff --git a/include/dm/device-internal.h
> b/include/dm/device-internal.h index 5a4d50c..b4f44c8 100644
> --- a/include/dm/device-internal.h
> +++ b/include/dm/device-internal.h
> @@ -120,6 +120,21 @@ int device_unbind(struct udevice *dev);
>  static inline int device_unbind(struct udevice *dev) { return 0; }
>  #endif
>  
> +/**
> + * device_chld_unbind() - Unbind all device's children from the
> device
> + *
> + * On error, the function continues to unbind all children, and
> reports the
> + * first error.
> + *
> + * @dev:	The device that is to be stripped of its children
> + * @return 0 on success, -ve on error
> + */
> +#if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
> +int device_chld_unbind(struct udevice *dev);
> +#else
> +static inline int device_chld_unbind(struct udevice *dev) { return
> 0; } +#endif
> +
>  #if CONFIG_IS_ENABLED(DM_DEVICE_REMOVE)
>  void device_free(struct udevice *dev);
>  #else




Best regards,

Lukasz Majewski

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