[U-Boot] [PATCH] serial: ns16550: Fix serial output on Tegra186

[Alexandre Courbot]

On 09/30/2016 05:46 PM, Thierry Reding wrote:
> From: Thierry Reding <treding at nvidia.com>
> 
> For Tegra186 there are currently no UART clocks wired up in device tree.
> This exposes a regression introduced in commit 50fce1d5d874 ("serial:
> ns16550: Support clocks via phandle"), which causes the p2771-0000-500
> board (and probably any Tegra186-based board as well) to fail to boot.
> 
> The reason is that if no clocks property exists, then clk_get_by_index()
> returns -ENOENT (via fdtdec_parse_phandle_with_args()) rather than
> -ENODEV as the above-mentioned commit expects.
> 
> Fix this by checking for the right error code.

Tested-by: Alexandre Courbot <acourbot at nvidia.com>

I sent a similar patch ~10 minutes before this one, but Thierry's commit
message is clearer than mine (and his handling of -ENODEV probably more
correct as well), so let's go with this version!