[U-Boot] [PATCH V5 02/18] usb: ehci-mx6: add support for host mode otg port

[Marek Vasut <marex@denx.de>]

Dear Troy Kisky,

> Previously, only host1 was supported using an index of 0.
> Now, otg has index 0, host1 is 1, host2 is 2, host3 is 3.
> Since OTG requires usbmode to be set after reset, I added
> CONFIG_EHCI_HCD_INIT_AFTER_RESET to nitrogen6x.h and
> mx6qsabreauto.h.
> 
> I also added a weak function board_ehci_power to handle
> turning power on/off for otg.
> 
> Signed-off-by: Troy Kisky <troy.kisky@boundarydevices.com>
> 
> ---
> V4: new patch, replaces "usb: gadget: mv_udc: fix hardware udc address for
> i.MX6" and has the bonus of giving OTG host mode support
> 
> V5: use CONFIG_EHCI_HCD_INIT_AFTER_RESET instead of a weak function.
> Return error if otg_id is high.
> ---
>  drivers/usb/host/ehci-mx6.c     | 123
> +++++++++++++++++++++++++++------------- include/configs/mx6qsabreauto.h |
>   3 +-
>  include/configs/nitrogen6x.h    |   3 +-
>  3 files changed, 87 insertions(+), 42 deletions(-)
> 
> diff --git a/drivers/usb/host/ehci-mx6.c b/drivers/usb/host/ehci-mx6.c
> index eb24af5..ff4424d 100644
> --- a/drivers/usb/host/ehci-mx6.c
> +++ b/drivers/usb/host/ehci-mx6.c
> @@ -35,6 +35,7 @@
>  #define USBPHY_CTRL_CLKGATE			0x40000000
>  #define USBPHY_CTRL_ENUTMILEVEL3		0x00008000
>  #define USBPHY_CTRL_ENUTMILEVEL2		0x00004000
> +#define USBPHY_CTRL_OTD_ID_BIT			27

Why is this anarchism used here? Why is it not defined as the rest of the 
values? Btw. its OTG_ID_VALUE , not OTD.

[...]

> @@ -123,31 +156,36 @@ static int usbh1_phy_enable(void)
>  	/* Power up the PHY */
>  	__raw_writel(0, phy_reg + USBPHY_PWD);
>  	/* enable FS/LS device */
> -	val = __raw_readl(phy_reg + USBPHY_CTRL);
> +	val = __raw_readl(phy_ctrl);
>  	val |= (USBPHY_CTRL_ENUTMILEVEL2 | USBPHY_CTRL_ENUTMILEVEL3);
> -	__raw_writel(val, phy_reg + USBPHY_CTRL);
> +	__raw_writel(val, phy_ctrl);
> 
> -	return 0;
> +	return (val >> USBPHY_CTRL_OTD_ID_BIT) & 1;

See above, you can use return (val & USBPHY_CTRL_OTG_ID_VALUE); here instead.

>  }
> 
> -static void usbh1_oc_config(void)
> +struct usbnc_regs {
> +	u32	ctrl[4];	/* otg/host1-3 */

This won't scale. Align this with the # of controllers you claim you have here, 
why dont you?

[...]

> diff --git a/include/configs/mx6qsabreauto.h
> b/include/configs/mx6qsabreauto.h index 5530fc6..9e48a49 100644
> --- a/include/configs/mx6qsabreauto.h
> +++ b/include/configs/mx6qsabreauto.h
> @@ -23,7 +23,8 @@
>  #define CONFIG_USB_STORAGE
>  #define CONFIG_USB_HOST_ETHER
>  #define CONFIG_USB_ETHER_ASIX
> -#define CONFIG_MXC_USB_PORT	1
> +#define CONFIG_USB_MAX_CONTROLLER_COUNT 2
> +#define CONFIG_EHCI_HCD_INIT_AFTER_RESET	/* For OTG port */
>  #define CONFIG_MXC_USB_PORTSC	(PORT_PTS_UTMI | PORT_PTS_PTW)
>  #define CONFIG_MXC_USB_FLAGS	0
> 
> diff --git a/include/configs/nitrogen6x.h b/include/configs/nitrogen6x.h
> index 3454b86..2e5ae13 100644
> --- a/include/configs/nitrogen6x.h
> +++ b/include/configs/nitrogen6x.h
> @@ -119,7 +119,8 @@
>  #define CONFIG_USB_HOST_ETHER
>  #define CONFIG_USB_ETHER_ASIX
>  #define CONFIG_USB_ETHER_SMSC95XX
> -#define CONFIG_MXC_USB_PORT	1
> +#define CONFIG_USB_MAX_CONTROLLER_COUNT 2
> +#define CONFIG_EHCI_HCD_INIT_AFTER_RESET	/* For OTG port */
>  #define CONFIG_MXC_USB_PORTSC	(PORT_PTS_UTMI | PORT_PTS_PTW)
>  #define CONFIG_MXC_USB_FLAGS	0

Does this patch do two things here ? I think it does, if I'm right, split this 
board adjustment away please.

Best regards,
Marek Vasut