On 09/30/2016 05:46 PM, Thierry Reding wrote:
From: Thierry Reding treding@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@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!