[U-Boot,v3] usb: dwc2_udc_otg: support 8-bit interface

Define CONFIG_USB_GADGET_DWC2_OTG_PHY_BUS_WIDTH_8 to allow the
physical interface to be 8-bit (rather than 16-bit).

Signed-off-by: Steve Rae <srae@broadcom.com>
---
from [1] (line ~124)

    /* The Kona PHY supports an 8-bit wide UTMI interface */
    [...snip...]

    module_platform_driver(bcm_kona_usb2_driver);

    MODULE_ALIAS("platform:bcm-kona-usb2");
    MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
    MODULE_DESCRIPTION("BCM Kona USB 2.0 PHY driver");
    MODULE_LICENSE("GPL v2");

[1] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/phy/phy-bcm-kona-usb2.c

Changes in v3:
- implement Marek's suggestion

Changes in v2:
- implement as Kconfig

 configs/bcm11130_defconfig        |  1 +
 configs/bcm11130_nand_defconfig   |  1 +
 configs/bcm28155_ap_defconfig     |  1 +
 configs/bcm28155_w1d_defconfig    |  1 +
 drivers/usb/gadget/Kconfig        | 10 ++++++++++
 drivers/usb/gadget/dwc2_udc_otg.c |  4 ++++
 6 files changed, 18 insertions(+)

On 06/07/2016 02:57 AM, Steve Rae wrote:
> Define CONFIG_USB_GADGET_DWC2_OTG_PHY_BUS_WIDTH_8 to allow the
> physical interface to be 8-bit (rather than 16-bit).
> 
> Signed-off-by: Steve Rae <srae@broadcom.com>

Acked-by: Marek Vasut <marex@denx.de>

> ---

btw I'd still like to see the defconfig bit split at least in a separate
patch.

> from [1] (line ~124)
> 
>     /* The Kona PHY supports an 8-bit wide UTMI interface */
>     [...snip...]
> 
>     module_platform_driver(bcm_kona_usb2_driver);
> 
>     MODULE_ALIAS("platform:bcm-kona-usb2");
>     MODULE_AUTHOR("Matt Porter <mporter@linaro.org>");
>     MODULE_DESCRIPTION("BCM Kona USB 2.0 PHY driver");
>     MODULE_LICENSE("GPL v2");
> 
> [1] https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/phy/phy-bcm-kona-usb2.c
> 
> Changes in v3:
> - implement Marek's suggestion
> 
> Changes in v2:
> - implement as Kconfig
> 
>  configs/bcm11130_defconfig        |  1 +
>  configs/bcm11130_nand_defconfig   |  1 +
>  configs/bcm28155_ap_defconfig     |  1 +
>  configs/bcm28155_w1d_defconfig    |  1 +
>  drivers/usb/gadget/Kconfig        | 10 ++++++++++
>  drivers/usb/gadget/dwc2_udc_otg.c |  4 ++++
>  6 files changed, 18 insertions(+)
> 
> diff --git a/configs/bcm11130_defconfig b/configs/bcm11130_defconfig
> index b8ec8ac..2716868 100644
> --- a/configs/bcm11130_defconfig
> +++ b/configs/bcm11130_defconfig
> @@ -18,6 +18,7 @@ CONFIG_SYS_NS16550=y
>  CONFIG_USB=y
>  CONFIG_USB_GADGET=y
>  CONFIG_USB_GADGET_DWC2_OTG=y
> +CONFIG_USB_GADGET_DWC2_OTG_PHY_BUS_WIDTH_8=y
>  CONFIG_USB_GADGET_DOWNLOAD=y
>  CONFIG_G_DNL_MANUFACTURER="Broadcom Corporation"
>  CONFIG_G_DNL_VENDOR_NUM=0x18d1
> diff --git a/configs/bcm11130_nand_defconfig b/configs/bcm11130_nand_defconfig
> index 6021fd2..8e01c52 100644
> --- a/configs/bcm11130_nand_defconfig
> +++ b/configs/bcm11130_nand_defconfig
> @@ -18,6 +18,7 @@ CONFIG_SYS_NS16550=y
>  CONFIG_USB=y
>  CONFIG_USB_GADGET=y
>  CONFIG_USB_GADGET_DWC2_OTG=y
> +CONFIG_USB_GADGET_DWC2_OTG_PHY_BUS_WIDTH_8=y
>  CONFIG_USB_GADGET_DOWNLOAD=y
>  CONFIG_G_DNL_MANUFACTURER="Broadcom Corporation"
>  CONFIG_G_DNL_VENDOR_NUM=0x18d1
> diff --git a/configs/bcm28155_ap_defconfig b/configs/bcm28155_ap_defconfig
> index 4404f32..eb58401 100644
> --- a/configs/bcm28155_ap_defconfig
> +++ b/configs/bcm28155_ap_defconfig
> @@ -17,6 +17,7 @@ CONFIG_SYS_NS16550=y
>  CONFIG_USB=y
>  CONFIG_USB_GADGET=y
>  CONFIG_USB_GADGET_DWC2_OTG=y
> +CONFIG_USB_GADGET_DWC2_OTG_PHY_BUS_WIDTH_8=y
>  CONFIG_USB_GADGET_DOWNLOAD=y
>  CONFIG_G_DNL_MANUFACTURER="Broadcom Corporation"
>  CONFIG_G_DNL_VENDOR_NUM=0x18d1
> diff --git a/configs/bcm28155_w1d_defconfig b/configs/bcm28155_w1d_defconfig
> index 60eb328..35d04af 100644
> --- a/configs/bcm28155_w1d_defconfig
> +++ b/configs/bcm28155_w1d_defconfig
> @@ -18,6 +18,7 @@ CONFIG_SYS_NS16550=y
>  CONFIG_USB=y
>  CONFIG_USB_GADGET=y
>  CONFIG_USB_GADGET_DWC2_OTG=y
> +CONFIG_USB_GADGET_DWC2_OTG_PHY_BUS_WIDTH_8=y
>  CONFIG_USB_GADGET_DOWNLOAD=y
>  CONFIG_G_DNL_MANUFACTURER="Broadcom Corporation"
>  CONFIG_G_DNL_VENDOR_NUM=0x18d1
> diff --git a/drivers/usb/gadget/Kconfig b/drivers/usb/gadget/Kconfig
> index a35a1c7..ae62476 100644
> --- a/drivers/usb/gadget/Kconfig
> +++ b/drivers/usb/gadget/Kconfig
> @@ -52,6 +52,16 @@ config USB_GADGET_DWC2_OTG
>  	  driver to operate in Peripheral mode. This option requires
>  	  USB_GADGET to be enabled.
>  
> +if USB_GADGET_DWC2_OTG
> +
> +config USB_GADGET_DWC2_OTG_PHY_BUS_WIDTH_8
> +	bool "DesignWare USB2.0 HS OTG controller 8-bit PHY bus width"
> +	help
> +	  Set the Designware USB2.0 high-speed OTG controller
> +	  PHY interface width to 8 bits, rather than the default (16 bits).
> +
> +endif # USB_GADGET_DWC2_OTG
> +
>  config CI_UDC
>  	bool "ChipIdea device controller"
>  	select USB_GADGET_DUALSPEED
> diff --git a/drivers/usb/gadget/dwc2_udc_otg.c b/drivers/usb/gadget/dwc2_udc_otg.c
> index cb20b00..a23278d 100644
> --- a/drivers/usb/gadget/dwc2_udc_otg.c
> +++ b/drivers/usb/gadget/dwc2_udc_otg.c
> @@ -415,7 +415,11 @@ static void reconfig_usbd(struct dwc2_udc *dev)
>  		|0<<7		/* Ulpi DDR sel*/
>  		|0<<6		/* 0: high speed utmi+, 1: full speed serial*/
>  		|0<<4		/* 0: utmi+, 1:ulpi*/
> +#ifdef CONFIG_USB_GADGET_DWC2_OTG_PHY_BUS_WIDTH_8
> +		|0<<3		/* phy i/f  0:8bit, 1:16bit*/
> +#else
>  		|1<<3		/* phy i/f  0:8bit, 1:16bit*/
> +#endif
>  		|0x7<<0;	/* HS/FS Timeout**/
>  
>  	if (dev->pdata->usb_gusbcfg)
>