• Stephen Warren's avatar
    video: tegra: refuse to bind to disabled dcs · 54693cbd
    Stephen Warren authored
    This prevents the following boot-time message on any board where only the
    first DC is in use, yet the DC's DT node is enabled:
    stdio_add_devices: Video device failed (ret=-22)
    (This happens on at least Harmony, Ventana, and likely any other Tegra20
    board with display enabled other than Seaboard).
    The Tegra DC's DT node represents a display controller. It may itself
    drive an integrated RGB display output, or be used by some other display
    controller such as HDMI. For this reason the DC node itself is not
    enabled/disabled in DT; the DC itself is considered a shared resource, not
    the final (board-specific) display output. The node should instantiate a
    display output driver only if the rgb subnode is enabled. Other output
    drivers are free to use the DC if they are enabled and their DT node
    references the DC's DT node. Adapt the Tegra display drivers' bind()
    routine to only bind to the DC's DT node if the RGB subnode is enabled.
    Now that the display driver does the right thing, remove the workaround
    for this issue from Seaboard's DT file.
    Cc: Thierry Reding <treding@nvidia.com>
    Signed-off-by: default avatarStephen Warren <swarren@nvidia.com>
    Acked-by: default avatarThierry Reding <treding@nvidia.com>
    Reviewed-by: default avatarSimon Glass <sjg@chromium.org>
tegra20-seaboard.dts 5.78 KB