[U-Boot] [PATCH 1/3] ARM: tegra: fix USB ULPI PHY reset signal inversion confusion

[Simon Glass]

On 15 September 2016 at 12:19, Stephen Warren <swarren at wwwdotorg.org> wrote:
> From: Stephen Warren <swarren at nvidia.com>
>
> USB ULPI PHY reset signals are typically active low. Consequently, they
> should be marked as GPIO_ACTIVE_LOW in device tree, and indeed they are in
> the Linux kernel DTs, and in DT properties that U-Boot doesn't yet use.
> However, in DT properties that U-Boot does use, the value has been set to
> 0 (== GPIO_ACTIVE_HIGH) to work around a bug in U-Boot.
>
> This change fixes the DT to correctly represent the HW, and fixes the
> Tegra USB driver to cope with the fact that dm_gpio_set_value() internally
> handles any inversions implied by the DT value GPIO_ACTIVE_LOW.
>
> Cc: Marcel Ziswiler <marcel.ziswiler at toradex.com>
> Signed-off-by: Stephen Warren <swarren at nvidia.com>
> ---
>  arch/arm/dts/tegra20-colibri.dts |  3 ++-
>  arch/arm/dts/tegra20-harmony.dts |  3 ++-
>  drivers/usb/host/ehci-tegra.c    | 13 +++++++++++--
>  3 files changed, 15 insertions(+), 4 deletions(-)

Reviewed-by: Simon Glass <sjg at chromium.org>