On Tue, May 25, 2021 at 04:59:24PM +0800, Chunfeng Yun wrote:
> Add helper to get "role-switch-default-mode", and convert it
> to the corresponding enum usb_dr_mode
>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
> ---
> drivers/usb/common/common.c | 20 ++++++++++++++++++++
> include/linux/usb/otg.h | 1 +
> 2 files changed, 21 insertions(+)
>
> diff --git a/drivers/usb/common/common.c b/drivers/usb/common/common.c
> index fff318597337..78a625a4e526 100644
> --- a/drivers/usb/common/common.c
> +++ b/drivers/usb/common/common.c
> @@ -207,6 +207,26 @@ enum usb_dr_mode usb_get_dr_mode(struct device *dev)
> }
> EXPORT_SYMBOL_GPL(usb_get_dr_mode);
>
> +/**
> + * usb_get_role_switch_default_mode - Get default mode for given device
> + * @dev: Pointer to the given device
> + *
> + * The function gets string from property 'role-switch-default-mode',
> + * and returns the corresponding enum usb_dr_mode.
> + */
> +enum usb_dr_mode usb_get_role_switch_default_mode(struct device *dev)
> +{
> + const char *str;
> + int ret;
> +
> + ret = device_property_read_string(dev, "role-switch-default-mode", &str);
> + if (ret < 0)
> + return USB_DR_MODE_UNKNOWN;
> +
> + return usb_get_dr_mode_from_string(str);
> +}
> +EXPORT_SYMBOL_GPL(usb_get_role_switch_default_mode);
> +
> /**
> * usb_decode_interval - Decode bInterval into the time expressed in 1us unit
> * @epd: The descriptor of the endpoint
> diff --git a/include/linux/usb/otg.h b/include/linux/usb/otg.h
> index a86ee6aad51b..bde313c97fb6 100644
> --- a/include/linux/usb/otg.h
> +++ b/include/linux/usb/otg.h
> @@ -121,5 +121,6 @@ enum usb_dr_mode {
> };
>
> extern enum usb_dr_mode usb_get_dr_mode(struct device *dev);
> +extern enum usb_dr_mode usb_get_role_switch_default_mode(struct device *dev);
What other code outside of the dwc3 driver will ever need to call this?
thanks,
greg k-h
