[U-Boot] [PATCH] ARM: tegra: add Colibri T30 board support

[Stephen Warren <swarren@wwwdotorg.org>]

On 07/31/2014 11:36 AM, Stefan Agner wrote:
> This adds board support for the Toradex Colibri T30 module.
>
> Working functions:
> - SD card boot
> - eMMC environment and boot
> - USB host/USB client (on the dual role port)
> - Network (via ASIX USB)

>   arch/arm/Kconfig                                   |   4 +
>   arch/arm/dts/Makefile                              |   1 +
>   arch/arm/dts/tegra30-colibri.dts                   |  84 +++++
>   arch/arm/include/asm/mach-types.h                  |  13 +
>   board/toradex/colibri_t30/Makefile                 |   6 +
>   board/toradex/colibri_t30/colibri_t30.c            |  52 +++
>   .../colibri_t30/pinmux-config-colibri_t30.h        | 360 +++++++++++++++++++++
>   include/configs/colibri_t30.h                      |  73 +++++

I think in latest u-boot/master, you'll also need to add 
configs/colibri_t30_defconfig.

> diff --git a/arch/arm/dts/tegra30-colibri.dts b/arch/arm/dts/tegra30-colibri.dts

> +	/* EHCI instance 0: USB1_DP/N -> USBC_P/N */
> +	usb at 7d000000 {
> +		status = "okay";
> +		dr_mode = "otg";
> +	};

For OTG support, VBUS needs to be able to be turned on/off. Should this 
port be host-mode, or a VBUS GPIO defined?

> diff --git a/board/toradex/colibri_t30/colibri_t30.c b/board/toradex/colibri_t30/colibri_t30.c

> +void pin_mux_usb(void)
> +{
> +	/* Enable LAN_VBUS */
> +	gpio_request(GPIO_PDD2, NULL);
> +	gpio_direction_output(GPIO_PDD2, 1);
> +
> +	/* Reset ASIX using LAN_RESET */
> +	gpio_request(GPIO_PDD0, NULL);
> +	gpio_direction_output(GPIO_PDD0, 0);
> +
> +	udelay(5);
> +
> +	gpio_set_value(GPIO_PDD0, 1);
> +}

It might be nice to remove the blank lines around the udelay() call; I 
initially didn't notice that GOPIO_PDD0 was manipulated by the code both 
before and after the udelay() and hence there was already a comment 
saying what GPIO_PDD0 controlled. Nestling the lines together would make 
this more obvious.

> diff --git a/include/configs/colibri_t30.h b/include/configs/colibri_t30.h

> +#define CONFIG_I2C_MULTI_BUS
> +#define CONFIG_SYS_MAX_I2C_BUS		TEGRA_I2C_NUM_CONTROLLERS

Are those needed? They aren't defined in e.g. the Beaver config header.

> +#define BOARD_EXTRA_ENV_SETTINGS \
> +	"board_name=colibri-eval-v3\0" \
> +	"fdtfile=tegra30-colibri-eval-v3.dtb\0"

It'd be nice to name the board the same in U-Boot as the kernel DT 
filename. Then you wouldn't need to manually override the default values 
here.

> +#include "tegra-common-ums.h"

Did you test this? I mostly developed the USB device mode support on 
Tegra124. While at some point I did test it on Beaver/Tegra30, it was 
early on and not very extensive. I'd love to hear that it works well for 
you too:-)

(BTW, I sent a patch to rename that file to tegra-common-usb-gadget.h, 
since I added DFU support too, so depending on what order TomW applies 
our patches, one of us will need to rebase)